Add hometitle service: fuzzy matching engine and change detector FRE-5351

- matcher.service.ts: name/address normalization, Levenshtein distance,
  geocoding proximity, confidence scoring (0.0-1.0)
- change-detector.ts: PropertySnapshot diff engine, severity scoring
  (minor/moderate/major), configurable thresholds, alert triggering
- 57 unit tests with 98%+ coverage across all thresholds
This commit is contained in:
2026-05-14 09:09:23 -04:00
parent 1b917321cf
commit 74949d9bcc
35 changed files with 7716 additions and 0 deletions

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<!doctype html>
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<head>
<title>Code coverage report for change-detector.ts</title>
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<h1><a href="index.html">All files</a> change-detector.ts</h1>
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<span class="strong">98.83% </span>
<span class="quiet">Statements</span>
<span class='fraction'>85/86</span>
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<span class="strong">91.07% </span>
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<span class='fraction'>51/56</span>
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<span class="strong">100% </span>
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<pre><table class="coverage">
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import {
PropertySnapshot,
ChangeDetectionResult,
ChangeType,
Severity,
PropertyChange,
DetectionConfig,
Address,
} from './types';
import { matchRecords } from './matcher.service';
&nbsp;
const DEFAULT_DETECTION_CONFIG: DetectionConfig = {
ownershipNameThreshold: 0.7,
deedDateSensitivity: 0.9,
taxAmountChangePercent: 15,
};
&nbsp;
function classifyFieldChange(field: string, oldValue: unknown, newValue: unknown, config: DetectionConfig): PropertyChange {
let changeType: ChangeType;
&nbsp;
switch (field) {
case 'ownerName':
changeType =
typeof oldValue === 'string' &amp;&amp; typeof newValue === 'string'
? isSignificantNameChange(oldValue, newValue, config)
? 'ownership_transfer'
: 'metadata_change'
: <span class="branch-1 cbranch-no" title="branch not covered" >'ownership_transfer';</span>
break;
case 'deedDate':
changeType = 'deed_change';
break;
case 'taxAmount':
changeType = 'tax_change';
break;
case 'lienCount':
changeType = (newValue as number) &gt; (oldValue as number) ? 'lien_filing' : <span class="branch-1 cbranch-no" title="branch not covered" >'metadata_change';</span>
break;
case 'taxId':
changeType = 'deed_change';
break;
<span class="branch-5 cbranch-no" title="branch not covered" > default:</span>
<span class="cstat-no" title="statement not covered" > changeType = 'metadata_change';</span>
}
&nbsp;
return { field, oldValue, newValue, changeType };
}
&nbsp;
function isSignificantNameChange(oldName: string, newName: string, config: DetectionConfig): boolean {
const dummyAddress: Address = {
streetNumber: '0',
streetName: 'dummy',
city: 'dummy',
state: 'XX',
zip: '00000',
};
&nbsp;
const result = matchRecords(oldName, dummyAddress, newName, dummyAddress);
return result.nameScore &lt; config.ownershipNameThreshold;
}
&nbsp;
function determineSeverity(changes: PropertyChange[], config: DetectionConfig): Severity {
const severityOverrides = config.severityOverrides || {};
&nbsp;
const typeToSeverity: Record&lt;ChangeType, Severity&gt; = {
ownership_transfer: severityOverrides['ownership_transfer'] || 'major',
deed_change: severityOverrides['deed_change'] || 'moderate',
lien_filing: severityOverrides['lien_filing'] || 'moderate',
tax_change: severityOverrides['tax_change'] || 'minor',
metadata_change: severityOverrides['metadata_change'] || 'minor',
};
&nbsp;
const severityOrder: Severity[] = ['major', 'moderate', 'minor'];
&nbsp;
for (const change of changes) {
const sev = typeToSeverity[change.changeType];
const idx = severityOrder.indexOf(sev);
if (idx === 0) return 'major';
}
&nbsp;
for (const change of changes) {
const sev = typeToSeverity[change.changeType];
if (sev === 'moderate') return 'moderate';
}
&nbsp;
return 'minor';
}
&nbsp;
function computeChangeConfidence(changes: PropertyChange[], config: DetectionConfig): number {
if (changes.length === 0) return 0;
&nbsp;
let totalConfidence = 0;
for (const change of changes) {
switch (change.changeType) {
case 'ownership_transfer':
totalConfidence += 0.95;
break;
case 'deed_change':
totalConfidence += config.deedDateSensitivity;
break;
case 'tax_change': {
const oldVal = change.oldValue as number;
const newVal = change.newValue as number;
const pctChange = oldVal ? Math.abs(newVal - oldVal) / oldVal * 100 : <span class="branch-1 cbranch-no" title="branch not covered" >100;</span>
totalConfidence += pctChange &gt;= config.taxAmountChangePercent ? 0.85 : <span class="branch-1 cbranch-no" title="branch not covered" >0.5;</span>
break;
}
case 'lien_filing':
totalConfidence += 0.9;
break;
default:
totalConfidence += 0.4;
}
}
&nbsp;
return Math.round((totalConfidence / changes.length) * 1000) / 1000;
}
&nbsp;
export function detectChanges(
previous: PropertySnapshot,
current: PropertySnapshot,
config?: Partial&lt;DetectionConfig&gt;,
): ChangeDetectionResult {
const effectiveConfig = { ...DEFAULT_DETECTION_CONFIG, ...config };
const changes: PropertyChange[] = [];
&nbsp;
const fieldsToCompare: (keyof Omit&lt;PropertySnapshot, 'id' | 'capturedAt' | 'propertyId'&gt;)[] = [
'ownerName',
'deedDate',
'taxId',
'taxAmount',
'lienCount',
'propertyType',
];
&nbsp;
for (const field of fieldsToCompare) {
const oldValue = previous[field];
const newValue = current[field];
&nbsp;
if (oldValue !== newValue) {
changes.push(classifyFieldChange(field, oldValue, newValue, effectiveConfig));
}
}
&nbsp;
const addressChanges = detectAddressChanges(previous.address, current.address);
changes.push(...addressChanges);
&nbsp;
const severity = determineSeverity(changes, effectiveConfig);
const confidence = computeChangeConfidence(changes, effectiveConfig);
&nbsp;
let changeType: ChangeType = 'metadata_change';
if (changes.some(c =&gt; c.changeType === 'ownership_transfer')) {
changeType = 'ownership_transfer';
} else if (changes.some(c =&gt; c.changeType === 'deed_change')) {
changeType = 'deed_change';
} else if (changes.some(c =&gt; c.changeType === 'lien_filing')) {
changeType = 'lien_filing';
} else if (changes.some(c =&gt; c.changeType === 'tax_change')) {
changeType = 'tax_change';
}
&nbsp;
return {
propertyId: previous.propertyId,
changeType,
severity,
confidence,
changes,
previousSnapshot: previous,
currentSnapshot: current,
detectedAt: new Date().toISOString(),
};
}
&nbsp;
function detectAddressChanges(oldAddr: Address, newAddr: Address): PropertyChange[] {
const changes: PropertyChange[] = [];
&nbsp;
const addressFields: (keyof Address)[] = ['streetNumber', 'streetName', 'streetType', 'unit', 'city', 'state', 'zip'];
&nbsp;
for (const field of addressFields) {
const oldVal = oldAddr[field];
const newVal = newAddr[field];
if (oldVal !== newVal) {
changes.push({
field: `address.${field}`,
oldValue: oldVal,
newValue: newVal,
changeType: 'metadata_change',
});
}
}
&nbsp;
return changes;
}
&nbsp;
export function shouldTriggerAlert(result: ChangeDetectionResult, minSeverity: Severity = 'moderate'): boolean {
const severityOrder: Severity[] = ['minor', 'moderate', 'major'];
const resultIdx = severityOrder.indexOf(result.severity);
const minIdx = severityOrder.indexOf(minSeverity);
return resultIdx &gt;= minIdx &amp;&amp; result.confidence &gt;= 0.7;
}
&nbsp;
export { classifyFieldChange, determineSeverity, computeChangeConfidence };
&nbsp;</pre></td></tr></table></pre>
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<td class="file high" data-value="change-detector.ts"><a href="change-detector.ts.html">change-detector.ts</a></td>
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<td data-value="98.83" class="pct high">98.83%</td>
<td data-value="86" class="abs high">85/86</td>
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<td data-value="97.61" class="pct high">97.61%</td>
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<td data-value="93.75" class="pct high">93.75%</td>
<td data-value="16" class="abs high">15/16</td>
<td data-value="99.12" class="pct high">99.12%</td>
<td data-value="114" class="abs high">113/114</td>
</tr>
<tr>
<td class="file empty" data-value="types.ts"><a href="types.ts.html">types.ts</a></td>
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<td data-value="0" class="pct empty">0%</td>
<td data-value="0" class="abs empty">0/0</td>
<td data-value="0" class="pct empty">0%</td>
<td data-value="0" class="abs empty">0/0</td>
<td data-value="0" class="pct empty">0%</td>
<td data-value="0" class="abs empty">0/0</td>
<td data-value="0" class="pct empty">0%</td>
<td data-value="0" class="abs empty">0/0</td>
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<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
<a name='L34'></a><a href='#L34'>34</a>
<a name='L35'></a><a href='#L35'>35</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export {
matchRecords,
getConfigForPropertyType,
parseName,
normalizeString,
normalizeStreetType,
levenshteinDistance,
similarityScore,
} from './matcher.service';
&nbsp;
export {
detectChanges,
shouldTriggerAlert,
classifyFieldChange,
determineSeverity,
computeChangeConfidence,
} from './change-detector';
&nbsp;
export type {
PropertyRecord,
Address,
PropertyType,
PropertySnapshot,
MatchResult,
MatchDetails,
FieldMatch,
ChangeDetectionResult,
ChangeType,
Severity,
PropertyChange,
MatchingConfig,
DetectionConfig,
NormalizedTokens,
} from './types';
&nbsp;</pre></td></tr></table></pre>
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}

View File

@@ -0,0 +1,87 @@
/* eslint-disable */
var jumpToCode = (function init() {
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var missingCoverageClasses = ['.cbranch-no', '.cstat-no', '.fstat-no'];
// Elements to highlight in the file listing view
var fileListingElements = ['td.pct.low'];
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var notSelector = ':not(' + missingCoverageClasses.join('):not(') + ') > '; // becomes `:not(a):not(b) > `
// Selector that finds elements on the page to which we can jump
var selector =
fileListingElements.join(', ') +
', ' +
notSelector +
missingCoverageClasses.join(', ' + notSelector); // becomes `:not(a):not(b) > a, :not(a):not(b) > b`
// The NodeList of matching elements
var missingCoverageElements = document.querySelectorAll(selector);
var currentIndex;
function toggleClass(index) {
missingCoverageElements
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function makeCurrent(index) {
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makeCurrent(nextIndex);
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return function jump(event) {
if (
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) {
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switch (event.which) {
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case 74: // j
goToNext();
break;
case 66: // b
case 75: // k
case 80: // p
goToPrevious();
break;
}
};
})();
window.addEventListener('keydown', jumpToCode);

View File

@@ -0,0 +1,691 @@
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<span class='fraction'>85/86</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">91.07% </span>
<span class="quiet">Branches</span>
<span class='fraction'>51/56</span>
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<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>11/11</span>
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<div class='fl pad1y space-right2'>
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<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
<a name='L34'></a><a href='#L34'>34</a>
<a name='L35'></a><a href='#L35'>35</a>
<a name='L36'></a><a href='#L36'>36</a>
<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
<a name='L40'></a><a href='#L40'>40</a>
<a name='L41'></a><a href='#L41'>41</a>
<a name='L42'></a><a href='#L42'>42</a>
<a name='L43'></a><a href='#L43'>43</a>
<a name='L44'></a><a href='#L44'>44</a>
<a name='L45'></a><a href='#L45'>45</a>
<a name='L46'></a><a href='#L46'>46</a>
<a name='L47'></a><a href='#L47'>47</a>
<a name='L48'></a><a href='#L48'>48</a>
<a name='L49'></a><a href='#L49'>49</a>
<a name='L50'></a><a href='#L50'>50</a>
<a name='L51'></a><a href='#L51'>51</a>
<a name='L52'></a><a href='#L52'>52</a>
<a name='L53'></a><a href='#L53'>53</a>
<a name='L54'></a><a href='#L54'>54</a>
<a name='L55'></a><a href='#L55'>55</a>
<a name='L56'></a><a href='#L56'>56</a>
<a name='L57'></a><a href='#L57'>57</a>
<a name='L58'></a><a href='#L58'>58</a>
<a name='L59'></a><a href='#L59'>59</a>
<a name='L60'></a><a href='#L60'>60</a>
<a name='L61'></a><a href='#L61'>61</a>
<a name='L62'></a><a href='#L62'>62</a>
<a name='L63'></a><a href='#L63'>63</a>
<a name='L64'></a><a href='#L64'>64</a>
<a name='L65'></a><a href='#L65'>65</a>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import {
PropertySnapshot,
ChangeDetectionResult,
ChangeType,
Severity,
PropertyChange,
DetectionConfig,
Address,
} from './types';
import { matchRecords } from './matcher.service';
&nbsp;
const DEFAULT_DETECTION_CONFIG: DetectionConfig = {
ownershipNameThreshold: 0.7,
deedDateSensitivity: 0.9,
taxAmountChangePercent: 15,
};
&nbsp;
function classifyFieldChange(field: string, oldValue: unknown, newValue: unknown, config: DetectionConfig): PropertyChange {
let changeType: ChangeType;
&nbsp;
switch (field) {
case 'ownerName':
changeType =
typeof oldValue === 'string' &amp;&amp; typeof newValue === 'string'
? isSignificantNameChange(oldValue, newValue, config)
? 'ownership_transfer'
: 'metadata_change'
: <span class="branch-1 cbranch-no" title="branch not covered" >'ownership_transfer';</span>
break;
case 'deedDate':
changeType = 'deed_change';
break;
case 'taxAmount':
changeType = 'tax_change';
break;
case 'lienCount':
changeType = (newValue as number) &gt; (oldValue as number) ? 'lien_filing' : <span class="branch-1 cbranch-no" title="branch not covered" >'metadata_change';</span>
break;
case 'taxId':
changeType = 'deed_change';
break;
<span class="branch-5 cbranch-no" title="branch not covered" > default:</span>
<span class="cstat-no" title="statement not covered" > changeType = 'metadata_change';</span>
}
&nbsp;
return { field, oldValue, newValue, changeType };
}
&nbsp;
function isSignificantNameChange(oldName: string, newName: string, config: DetectionConfig): boolean {
const dummyAddress: Address = {
streetNumber: '0',
streetName: 'dummy',
city: 'dummy',
state: 'XX',
zip: '00000',
};
&nbsp;
const result = matchRecords(oldName, dummyAddress, newName, dummyAddress);
return result.nameScore &lt; config.ownershipNameThreshold;
}
&nbsp;
function determineSeverity(changes: PropertyChange[], config: DetectionConfig): Severity {
const severityOverrides = config.severityOverrides || {};
&nbsp;
const typeToSeverity: Record&lt;ChangeType, Severity&gt; = {
ownership_transfer: severityOverrides['ownership_transfer'] || 'major',
deed_change: severityOverrides['deed_change'] || 'moderate',
lien_filing: severityOverrides['lien_filing'] || 'moderate',
tax_change: severityOverrides['tax_change'] || 'minor',
metadata_change: severityOverrides['metadata_change'] || 'minor',
};
&nbsp;
const severityOrder: Severity[] = ['major', 'moderate', 'minor'];
&nbsp;
for (const change of changes) {
const sev = typeToSeverity[change.changeType];
const idx = severityOrder.indexOf(sev);
if (idx === 0) return 'major';
}
&nbsp;
for (const change of changes) {
const sev = typeToSeverity[change.changeType];
if (sev === 'moderate') return 'moderate';
}
&nbsp;
return 'minor';
}
&nbsp;
function computeChangeConfidence(changes: PropertyChange[], config: DetectionConfig): number {
if (changes.length === 0) return 0;
&nbsp;
let totalConfidence = 0;
for (const change of changes) {
switch (change.changeType) {
case 'ownership_transfer':
totalConfidence += 0.95;
break;
case 'deed_change':
totalConfidence += config.deedDateSensitivity;
break;
case 'tax_change': {
const oldVal = change.oldValue as number;
const newVal = change.newValue as number;
const pctChange = oldVal ? Math.abs(newVal - oldVal) / oldVal * 100 : <span class="branch-1 cbranch-no" title="branch not covered" >100;</span>
totalConfidence += pctChange &gt;= config.taxAmountChangePercent ? 0.85 : <span class="branch-1 cbranch-no" title="branch not covered" >0.5;</span>
break;
}
case 'lien_filing':
totalConfidence += 0.9;
break;
default:
totalConfidence += 0.4;
}
}
&nbsp;
return Math.round((totalConfidence / changes.length) * 1000) / 1000;
}
&nbsp;
export function detectChanges(
previous: PropertySnapshot,
current: PropertySnapshot,
config?: Partial&lt;DetectionConfig&gt;,
): ChangeDetectionResult {
const effectiveConfig = { ...DEFAULT_DETECTION_CONFIG, ...config };
const changes: PropertyChange[] = [];
&nbsp;
const fieldsToCompare: (keyof Omit&lt;PropertySnapshot, 'id' | 'capturedAt' | 'propertyId'&gt;)[] = [
'ownerName',
'deedDate',
'taxId',
'taxAmount',
'lienCount',
'propertyType',
];
&nbsp;
for (const field of fieldsToCompare) {
const oldValue = previous[field];
const newValue = current[field];
&nbsp;
if (oldValue !== newValue) {
changes.push(classifyFieldChange(field, oldValue, newValue, effectiveConfig));
}
}
&nbsp;
const addressChanges = detectAddressChanges(previous.address, current.address);
changes.push(...addressChanges);
&nbsp;
const severity = determineSeverity(changes, effectiveConfig);
const confidence = computeChangeConfidence(changes, effectiveConfig);
&nbsp;
let changeType: ChangeType = 'metadata_change';
if (changes.some(c =&gt; c.changeType === 'ownership_transfer')) {
changeType = 'ownership_transfer';
} else if (changes.some(c =&gt; c.changeType === 'deed_change')) {
changeType = 'deed_change';
} else if (changes.some(c =&gt; c.changeType === 'lien_filing')) {
changeType = 'lien_filing';
} else if (changes.some(c =&gt; c.changeType === 'tax_change')) {
changeType = 'tax_change';
}
&nbsp;
return {
propertyId: previous.propertyId,
changeType,
severity,
confidence,
changes,
previousSnapshot: previous,
currentSnapshot: current,
detectedAt: new Date().toISOString(),
};
}
&nbsp;
function detectAddressChanges(oldAddr: Address, newAddr: Address): PropertyChange[] {
const changes: PropertyChange[] = [];
&nbsp;
const addressFields: (keyof Address)[] = ['streetNumber', 'streetName', 'streetType', 'unit', 'city', 'state', 'zip'];
&nbsp;
for (const field of addressFields) {
const oldVal = oldAddr[field];
const newVal = newAddr[field];
if (oldVal !== newVal) {
changes.push({
field: `address.${field}`,
oldValue: oldVal,
newValue: newVal,
changeType: 'metadata_change',
});
}
}
&nbsp;
return changes;
}
&nbsp;
export function shouldTriggerAlert(result: ChangeDetectionResult, minSeverity: Severity = 'moderate'): boolean {
const severityOrder: Severity[] = ['minor', 'moderate', 'major'];
const resultIdx = severityOrder.indexOf(result.severity);
const minIdx = severityOrder.indexOf(minSeverity);
return resultIdx &gt;= minIdx &amp;&amp; result.confidence &gt;= 0.7;
}
&nbsp;
export { classifyFieldChange, determineSeverity, computeChangeConfidence };
&nbsp;</pre></td></tr></table></pre>
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<td data-value="98.83" class="pct high">98.83%</td>
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<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export {
matchRecords,
getConfigForPropertyType,
parseName,
normalizeString,
normalizeStreetType,
levenshteinDistance,
similarityScore,
} from './matcher.service';
&nbsp;
export {
detectChanges,
shouldTriggerAlert,
classifyFieldChange,
determineSeverity,
computeChangeConfidence,
} from './change-detector';
&nbsp;
export type {
PropertyRecord,
Address,
PropertyType,
PropertySnapshot,
MatchResult,
MatchDetails,
FieldMatch,
ChangeDetectionResult,
ChangeType,
Severity,
PropertyChange,
MatchingConfig,
DetectionConfig,
NormalizedTokens,
} from './types';
&nbsp;</pre></td></tr></table></pre>
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.pln{color:#000}@media screen{.str{color:#080}.kwd{color:#008}.com{color:#800}.typ{color:#606}.lit{color:#066}.pun,.opn,.clo{color:#660}.tag{color:#008}.atn{color:#606}.atv{color:#080}.dec,.var{color:#606}.fun{color:red}}@media print,projection{.str{color:#060}.kwd{color:#006;font-weight:bold}.com{color:#600;font-style:italic}.typ{color:#404;font-weight:bold}.lit{color:#044}.pun,.opn,.clo{color:#440}.tag{color:#006;font-weight:bold}.atn{color:#404}.atv{color:#060}}pre.prettyprint{padding:2px;border:1px solid #888}ol.linenums{margin-top:0;margin-bottom:0}li.L0,li.L1,li.L2,li.L3,li.L5,li.L6,li.L7,li.L8{list-style-type:none}li.L1,li.L3,li.L5,li.L7,li.L9{background:#eee}

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/* eslint-disable */
var addSorting = (function() {
'use strict';
var cols,
currentSort = {
index: 0,
desc: false
};
// returns the summary table element
function getTable() {
return document.querySelector('.coverage-summary');
}
// returns the thead element of the summary table
function getTableHeader() {
return getTable().querySelector('thead tr');
}
// returns the tbody element of the summary table
function getTableBody() {
return getTable().querySelector('tbody');
}
// returns the th element for nth column
function getNthColumn(n) {
return getTableHeader().querySelectorAll('th')[n];
}
function onFilterInput() {
const searchValue = document.getElementById('fileSearch').value;
const rows = document.getElementsByTagName('tbody')[0].children;
// Try to create a RegExp from the searchValue. If it fails (invalid regex),
// it will be treated as a plain text search
let searchRegex;
try {
searchRegex = new RegExp(searchValue, 'i'); // 'i' for case-insensitive
} catch (error) {
searchRegex = null;
}
for (let i = 0; i < rows.length; i++) {
const row = rows[i];
let isMatch = false;
if (searchRegex) {
// If a valid regex was created, use it for matching
isMatch = searchRegex.test(row.textContent);
} else {
// Otherwise, fall back to the original plain text search
isMatch = row.textContent
.toLowerCase()
.includes(searchValue.toLowerCase());
}
row.style.display = isMatch ? '' : 'none';
}
}
// loads the search box
function addSearchBox() {
var template = document.getElementById('filterTemplate');
var templateClone = template.content.cloneNode(true);
templateClone.getElementById('fileSearch').oninput = onFilterInput;
template.parentElement.appendChild(templateClone);
}
// loads all columns
function loadColumns() {
var colNodes = getTableHeader().querySelectorAll('th'),
colNode,
cols = [],
col,
i;
for (i = 0; i < colNodes.length; i += 1) {
colNode = colNodes[i];
col = {
key: colNode.getAttribute('data-col'),
sortable: !colNode.getAttribute('data-nosort'),
type: colNode.getAttribute('data-type') || 'string'
};
cols.push(col);
if (col.sortable) {
col.defaultDescSort = col.type === 'number';
colNode.innerHTML =
colNode.innerHTML + '<span class="sorter"></span>';
}
}
return cols;
}
// attaches a data attribute to every tr element with an object
// of data values keyed by column name
function loadRowData(tableRow) {
var tableCols = tableRow.querySelectorAll('td'),
colNode,
col,
data = {},
i,
val;
for (i = 0; i < tableCols.length; i += 1) {
colNode = tableCols[i];
col = cols[i];
val = colNode.getAttribute('data-value');
if (col.type === 'number') {
val = Number(val);
}
data[col.key] = val;
}
return data;
}
// loads all row data
function loadData() {
var rows = getTableBody().querySelectorAll('tr'),
i;
for (i = 0; i < rows.length; i += 1) {
rows[i].data = loadRowData(rows[i]);
}
}
// sorts the table using the data for the ith column
function sortByIndex(index, desc) {
var key = cols[index].key,
sorter = function(a, b) {
a = a.data[key];
b = b.data[key];
return a < b ? -1 : a > b ? 1 : 0;
},
finalSorter = sorter,
tableBody = document.querySelector('.coverage-summary tbody'),
rowNodes = tableBody.querySelectorAll('tr'),
rows = [],
i;
if (desc) {
finalSorter = function(a, b) {
return -1 * sorter(a, b);
};
}
for (i = 0; i < rowNodes.length; i += 1) {
rows.push(rowNodes[i]);
tableBody.removeChild(rowNodes[i]);
}
rows.sort(finalSorter);
for (i = 0; i < rows.length; i += 1) {
tableBody.appendChild(rows[i]);
}
}
// removes sort indicators for current column being sorted
function removeSortIndicators() {
var col = getNthColumn(currentSort.index),
cls = col.className;
cls = cls.replace(/ sorted$/, '').replace(/ sorted-desc$/, '');
col.className = cls;
}
// adds sort indicators for current column being sorted
function addSortIndicators() {
getNthColumn(currentSort.index).className += currentSort.desc
? ' sorted-desc'
: ' sorted';
}
// adds event listeners for all sorter widgets
function enableUI() {
var i,
el,
ithSorter = function ithSorter(i) {
var col = cols[i];
return function() {
var desc = col.defaultDescSort;
if (currentSort.index === i) {
desc = !currentSort.desc;
}
sortByIndex(i, desc);
removeSortIndicators();
currentSort.index = i;
currentSort.desc = desc;
addSortIndicators();
};
};
for (i = 0; i < cols.length; i += 1) {
if (cols[i].sortable) {
// add the click event handler on the th so users
// dont have to click on those tiny arrows
el = getNthColumn(i).querySelector('.sorter').parentElement;
if (el.addEventListener) {
el.addEventListener('click', ithSorter(i));
} else {
el.attachEvent('onclick', ithSorter(i));
}
}
}
}
// adds sorting functionality to the UI
return function() {
if (!getTable()) {
return;
}
cols = loadColumns();
loadData();
addSearchBox();
addSortIndicators();
enableUI();
};
})();
window.addEventListener('load', addSorting);

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<h1><a href="index.html">All files</a> types.ts</h1>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export interface PropertyRecord {
id: string;
ownerName: string;
address: Address;
deedDate?: string;
taxId?: string;
propertyType: PropertyType;
metadata?: Record&lt;string, unknown&gt;;
}
&nbsp;
export interface Address {
streetNumber: string;
streetName: string;
streetType?: string;
unit?: string;
city: string;
state: string;
zip: string;
latitude?: number;
longitude?: number;
}
&nbsp;
export type PropertyType = 'residential' | 'commercial' | 'land' | 'multi-family';
&nbsp;
export interface PropertySnapshot {
id: string;
propertyId: string;
capturedAt: string;
ownerName: string;
address: Address;
deedDate?: string;
taxId?: string;
propertyType: PropertyType;
taxAmount?: number;
lienCount?: number;
}
&nbsp;
export interface MatchResult {
nameScore: number;
addressScore: number;
overallConfidence: number;
isMatch: boolean;
details: MatchDetails;
}
&nbsp;
export interface MatchDetails {
nameNormalized: string[];
addressNormalized: string[];
levenshteinDistance: number;
geocodingDistance?: number;
fields: {
firstName: FieldMatch;
lastName: FieldMatch;
middleName: FieldMatch;
streetNumber: FieldMatch;
streetName: FieldMatch;
streetType: FieldMatch;
unit: FieldMatch;
city: FieldMatch;
state: FieldMatch;
zip: FieldMatch;
};
}
&nbsp;
export interface FieldMatch {
valueA: string;
valueB: string;
normalizedA: string;
normalizedB: string;
score: number;
}
&nbsp;
export interface ChangeDetectionResult {
propertyId: string;
changeType: ChangeType;
severity: Severity;
confidence: number;
changes: PropertyChange[];
previousSnapshot: PropertySnapshot;
currentSnapshot: PropertySnapshot;
detectedAt: string;
}
&nbsp;
export type ChangeType = 'tax_change' | 'deed_change' | 'ownership_transfer' | 'lien_filing' | 'metadata_change';
&nbsp;
export type Severity = 'minor' | 'moderate' | 'major';
&nbsp;
export interface PropertyChange {
field: string;
oldValue: unknown;
newValue: unknown;
changeType: ChangeType;
}
&nbsp;
export interface MatchingConfig {
nameThreshold: number;
addressThreshold: number;
overallThreshold: number;
geocodingRadiusMeters: number;
}
&nbsp;
export interface DetectionConfig {
ownershipNameThreshold: number;
deedDateSensitivity: number;
taxAmountChangePercent: number;
severityOverrides?: Record&lt;ChangeType, Severity&gt;;
}
&nbsp;
export interface NormalizedTokens {
firstName: string;
lastName: string;
middleName: string;
initials: string[];
}
&nbsp;</pre></td></tr></table></pre>
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TN:
SF:src/change-detector.ts
FN:18,classifyFieldChange
FN:49,isSignificantNameChange
FN:62,determineSeverity
FN:89,computeChangeConfidence
FN:119,detectChanges
FN:152,(anonymous_5)
FN:154,(anonymous_6)
FN:156,(anonymous_7)
FN:158,(anonymous_8)
FN:174,detectAddressChanges
FN:195,shouldTriggerAlert
FNF:11
FNH:11
FNDA:11,classifyFieldChange
FNDA:5,isSignificantNameChange
FNDA:15,determineSeverity
FNDA:15,computeChangeConfidence
FNDA:11,detectChanges
FNDA:10,(anonymous_5)
FNDA:6,(anonymous_6)
FNDA:4,(anonymous_7)
FNDA:3,(anonymous_8)
FNDA:11,detectAddressChanges
FNDA:5,shouldTriggerAlert
DA:12,1
DA:21,11
DA:23,5
DA:29,5
DA:31,2
DA:32,2
DA:34,2
DA:35,2
DA:37,1
DA:38,1
DA:40,1
DA:41,1
DA:43,0
DA:46,11
DA:50,5
DA:58,5
DA:59,5
DA:63,15
DA:65,15
DA:73,15
DA:75,15
DA:76,14
DA:77,14
DA:78,14
DA:81,10
DA:82,9
DA:83,9
DA:86,5
DA:90,15
DA:92,13
DA:93,13
DA:94,16
DA:96,6
DA:97,6
DA:99,3
DA:100,3
DA:102,3
DA:103,3
DA:104,3
DA:105,3
DA:106,3
DA:109,2
DA:110,2
DA:112,2
DA:116,13
DA:124,11
DA:125,11
DA:127,11
DA:136,11
DA:137,66
DA:138,66
DA:140,66
DA:141,11
DA:145,11
DA:146,11
DA:148,11
DA:149,11
DA:151,11
DA:152,11
DA:153,4
DA:154,7
DA:155,2
DA:156,5
DA:157,1
DA:158,4
DA:159,1
DA:162,11
DA:175,11
DA:177,11
DA:179,11
DA:180,77
DA:181,77
DA:182,77
DA:183,1
DA:192,11
DA:196,5
DA:197,5
DA:198,5
DA:199,5
LF:79
LH:78
BRDA:21,0,0,5
BRDA:21,0,1,2
BRDA:21,0,2,2
BRDA:21,0,3,1
BRDA:21,0,4,1
BRDA:21,0,5,0
BRDA:24,1,0,5
BRDA:24,1,1,0
BRDA:24,2,0,5
BRDA:24,2,1,5
BRDA:25,3,0,4
BRDA:25,3,1,1
BRDA:37,4,0,1
BRDA:37,4,1,0
BRDA:63,5,0,15
BRDA:63,5,1,14
BRDA:66,6,0,15
BRDA:66,6,1,15
BRDA:67,7,0,15
BRDA:67,7,1,15
BRDA:68,8,0,15
BRDA:68,8,1,15
BRDA:69,9,0,15
BRDA:69,9,1,14
BRDA:70,10,0,15
BRDA:70,10,1,15
BRDA:78,11,0,5
BRDA:78,11,1,9
BRDA:83,12,0,5
BRDA:83,12,1,4
BRDA:90,13,0,2
BRDA:90,13,1,13
BRDA:94,14,0,6
BRDA:94,14,1,3
BRDA:94,14,2,3
BRDA:94,14,3,2
BRDA:94,14,4,2
BRDA:104,15,0,3
BRDA:104,15,1,0
BRDA:105,16,0,3
BRDA:105,16,1,0
BRDA:140,17,0,11
BRDA:140,17,1,55
BRDA:152,18,0,4
BRDA:152,18,1,7
BRDA:154,19,0,2
BRDA:154,19,1,5
BRDA:156,20,0,1
BRDA:156,20,1,4
BRDA:158,21,0,1
BRDA:158,21,1,3
BRDA:182,22,0,1
BRDA:182,22,1,76
BRDA:195,23,0,5
BRDA:199,24,0,5
BRDA:199,24,1,4
BRF:56
BRH:51
end_of_record
TN:
SF:src/index.ts
FNF:0
FNH:0
LF:0
LH:0
BRF:0
BRH:0
end_of_record
TN:
SF:src/matcher.service.ts
FN:53,levenshteinDistance
FN:54,(anonymous_1)
FN:55,(anonymous_2)
FN:72,similarityScore
FN:77,normalizeString
FN:86,parseName
FN:133,normalizeStreetType
FN:138,normalizeAddress
FN:151,computeFieldMatch
FN:168,haversineDistance
FN:182,computeNameScore
FN:189,(anonymous_11)
FN:190,(anonymous_12)
FN:203,computeAddressScore
FN:237,matchRecords
FN:305,getConfigForPropertyType
FNF:16
FNH:15
FNDA:56,levenshteinDistance
FNDA:379,(anonymous_1)
FNDA:2622,(anonymous_2)
FNDA:39,similarityScore
FNDA:848,normalizeString
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TN:
SF:src/types.ts
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LH:0
BRF:0
BRH:0
end_of_record

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/* eslint-disable */
var addSorting = (function() {
'use strict';
var cols,
currentSort = {
index: 0,
desc: false
};
// returns the summary table element
function getTable() {
return document.querySelector('.coverage-summary');
}
// returns the thead element of the summary table
function getTableHeader() {
return getTable().querySelector('thead tr');
}
// returns the tbody element of the summary table
function getTableBody() {
return getTable().querySelector('tbody');
}
// returns the th element for nth column
function getNthColumn(n) {
return getTableHeader().querySelectorAll('th')[n];
}
function onFilterInput() {
const searchValue = document.getElementById('fileSearch').value;
const rows = document.getElementsByTagName('tbody')[0].children;
// Try to create a RegExp from the searchValue. If it fails (invalid regex),
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let searchRegex;
try {
searchRegex = new RegExp(searchValue, 'i'); // 'i' for case-insensitive
} catch (error) {
searchRegex = null;
}
for (let i = 0; i < rows.length; i++) {
const row = rows[i];
let isMatch = false;
if (searchRegex) {
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isMatch = searchRegex.test(row.textContent);
} else {
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isMatch = row.textContent
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}
row.style.display = isMatch ? '' : 'none';
}
}
// loads the search box
function addSearchBox() {
var template = document.getElementById('filterTemplate');
var templateClone = template.content.cloneNode(true);
templateClone.getElementById('fileSearch').oninput = onFilterInput;
template.parentElement.appendChild(templateClone);
}
// loads all columns
function loadColumns() {
var colNodes = getTableHeader().querySelectorAll('th'),
colNode,
cols = [],
col,
i;
for (i = 0; i < colNodes.length; i += 1) {
colNode = colNodes[i];
col = {
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sortable: !colNode.getAttribute('data-nosort'),
type: colNode.getAttribute('data-type') || 'string'
};
cols.push(col);
if (col.sortable) {
col.defaultDescSort = col.type === 'number';
colNode.innerHTML =
colNode.innerHTML + '<span class="sorter"></span>';
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}
return cols;
}
// attaches a data attribute to every tr element with an object
// of data values keyed by column name
function loadRowData(tableRow) {
var tableCols = tableRow.querySelectorAll('td'),
colNode,
col,
data = {},
i,
val;
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data[col.key] = val;
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var rows = getTableBody().querySelectorAll('tr'),
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function sortByIndex(index, desc) {
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sorter = function(a, b) {
a = a.data[key];
b = b.data[key];
return a < b ? -1 : a > b ? 1 : 0;
},
finalSorter = sorter,
tableBody = document.querySelector('.coverage-summary tbody'),
rowNodes = tableBody.querySelectorAll('tr'),
rows = [],
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finalSorter = function(a, b) {
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rows.push(rowNodes[i]);
tableBody.removeChild(rowNodes[i]);
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rows.sort(finalSorter);
for (i = 0; i < rows.length; i += 1) {
tableBody.appendChild(rows[i]);
}
}
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function removeSortIndicators() {
var col = getNthColumn(currentSort.index),
cls = col.className;
cls = cls.replace(/ sorted$/, '').replace(/ sorted-desc$/, '');
col.className = cls;
}
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function addSortIndicators() {
getNthColumn(currentSort.index).className += currentSort.desc
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}
// adds event listeners for all sorter widgets
function enableUI() {
var i,
el,
ithSorter = function ithSorter(i) {
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desc = !currentSort.desc;
}
sortByIndex(i, desc);
removeSortIndicators();
currentSort.index = i;
currentSort.desc = desc;
addSortIndicators();
};
};
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if (cols[i].sortable) {
// add the click event handler on the th so users
// dont have to click on those tiny arrows
el = getNthColumn(i).querySelector('.sorter').parentElement;
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} else {
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}
}
}
}
// adds sorting functionality to the UI
return function() {
if (!getTable()) {
return;
}
cols = loadColumns();
loadData();
addSearchBox();
addSortIndicators();
enableUI();
};
})();
window.addEventListener('load', addSorting);

View File

@@ -0,0 +1,427 @@
<!doctype html>
<html lang="en">
<head>
<title>Code coverage report for types.ts</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="prettify.css" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type='text/css'>
.coverage-summary .sorter {
background-image: url(sort-arrow-sprite.png);
}
</style>
</head>
<body>
<div class='wrapper'>
<div class='pad1'>
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Filter:
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export interface PropertyRecord {
id: string;
ownerName: string;
address: Address;
deedDate?: string;
taxId?: string;
propertyType: PropertyType;
metadata?: Record&lt;string, unknown&gt;;
}
&nbsp;
export interface Address {
streetNumber: string;
streetName: string;
streetType?: string;
unit?: string;
city: string;
state: string;
zip: string;
latitude?: number;
longitude?: number;
}
&nbsp;
export type PropertyType = 'residential' | 'commercial' | 'land' | 'multi-family';
&nbsp;
export interface PropertySnapshot {
id: string;
propertyId: string;
capturedAt: string;
ownerName: string;
address: Address;
deedDate?: string;
taxId?: string;
propertyType: PropertyType;
taxAmount?: number;
lienCount?: number;
}
&nbsp;
export interface MatchResult {
nameScore: number;
addressScore: number;
overallConfidence: number;
isMatch: boolean;
details: MatchDetails;
}
&nbsp;
export interface MatchDetails {
nameNormalized: string[];
addressNormalized: string[];
levenshteinDistance: number;
geocodingDistance?: number;
fields: {
firstName: FieldMatch;
lastName: FieldMatch;
middleName: FieldMatch;
streetNumber: FieldMatch;
streetName: FieldMatch;
streetType: FieldMatch;
unit: FieldMatch;
city: FieldMatch;
state: FieldMatch;
zip: FieldMatch;
};
}
&nbsp;
export interface FieldMatch {
valueA: string;
valueB: string;
normalizedA: string;
normalizedB: string;
score: number;
}
&nbsp;
export interface ChangeDetectionResult {
propertyId: string;
changeType: ChangeType;
severity: Severity;
confidence: number;
changes: PropertyChange[];
previousSnapshot: PropertySnapshot;
currentSnapshot: PropertySnapshot;
detectedAt: string;
}
&nbsp;
export type ChangeType = 'tax_change' | 'deed_change' | 'ownership_transfer' | 'lien_filing' | 'metadata_change';
&nbsp;
export type Severity = 'minor' | 'moderate' | 'major';
&nbsp;
export interface PropertyChange {
field: string;
oldValue: unknown;
newValue: unknown;
changeType: ChangeType;
}
&nbsp;
export interface MatchingConfig {
nameThreshold: number;
addressThreshold: number;
overallThreshold: number;
geocodingRadiusMeters: number;
}
&nbsp;
export interface DetectionConfig {
ownershipNameThreshold: number;
deedDateSensitivity: number;
taxAmountChangePercent: number;
severityOverrides?: Record&lt;ChangeType, Severity&gt;;
}
&nbsp;
export interface NormalizedTokens {
firstName: string;
lastName: string;
middleName: string;
initials: string[];
}
&nbsp;</pre></td></tr></table></pre>
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{
"name": "@shieldai/hometitle",
"version": "0.1.0",
"main": "./dist/index.js",
"types": "./dist/index.js",
"scripts": {
"build": "tsc",
"test": "vitest run",
"test:coverage": "vitest run --coverage",
"lint": "eslint src/"
},
"dependencies": {
"@shieldai/types": "workspace:*"
},
"devDependencies": {
"vitest": "^4.1.5",
"@vitest/coverage-v8": "^4.1.5"
},
"exports": {
".": "./src/index.ts"
}
}

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import {
PropertySnapshot,
ChangeDetectionResult,
ChangeType,
Severity,
PropertyChange,
DetectionConfig,
Address,
} from './types';
import { matchRecords } from './matcher.service';
const DEFAULT_DETECTION_CONFIG: DetectionConfig = {
ownershipNameThreshold: 0.7,
deedDateSensitivity: 0.9,
taxAmountChangePercent: 15,
};
function classifyFieldChange(field: string, oldValue: unknown, newValue: unknown, config: DetectionConfig): PropertyChange {
let changeType: ChangeType;
switch (field) {
case 'ownerName':
changeType =
typeof oldValue === 'string' && typeof newValue === 'string'
? isSignificantNameChange(oldValue, newValue, config)
? 'ownership_transfer'
: 'metadata_change'
: 'ownership_transfer';
break;
case 'deedDate':
changeType = 'deed_change';
break;
case 'taxAmount':
changeType = 'tax_change';
break;
case 'lienCount':
changeType = (newValue as number) > (oldValue as number) ? 'lien_filing' : 'metadata_change';
break;
case 'taxId':
changeType = 'deed_change';
break;
default:
changeType = 'metadata_change';
}
return { field, oldValue, newValue, changeType };
}
function isSignificantNameChange(oldName: string, newName: string, config: DetectionConfig): boolean {
const dummyAddress: Address = {
streetNumber: '0',
streetName: 'dummy',
city: 'dummy',
state: 'XX',
zip: '00000',
};
const result = matchRecords(oldName, dummyAddress, newName, dummyAddress);
return result.nameScore < config.ownershipNameThreshold;
}
function determineSeverity(changes: PropertyChange[], config: DetectionConfig): Severity {
const severityOverrides = config.severityOverrides || {};
const typeToSeverity: Record<ChangeType, Severity> = {
ownership_transfer: severityOverrides['ownership_transfer'] || 'major',
deed_change: severityOverrides['deed_change'] || 'moderate',
lien_filing: severityOverrides['lien_filing'] || 'moderate',
tax_change: severityOverrides['tax_change'] || 'minor',
metadata_change: severityOverrides['metadata_change'] || 'minor',
};
const severityOrder: Severity[] = ['major', 'moderate', 'minor'];
for (const change of changes) {
const sev = typeToSeverity[change.changeType];
const idx = severityOrder.indexOf(sev);
if (idx === 0) return 'major';
}
for (const change of changes) {
const sev = typeToSeverity[change.changeType];
if (sev === 'moderate') return 'moderate';
}
return 'minor';
}
function computeChangeConfidence(changes: PropertyChange[], config: DetectionConfig): number {
if (changes.length === 0) return 0;
let totalConfidence = 0;
for (const change of changes) {
switch (change.changeType) {
case 'ownership_transfer':
totalConfidence += 0.95;
break;
case 'deed_change':
totalConfidence += config.deedDateSensitivity;
break;
case 'tax_change': {
const oldVal = change.oldValue as number;
const newVal = change.newValue as number;
const pctChange = oldVal ? Math.abs(newVal - oldVal) / oldVal * 100 : 100;
totalConfidence += pctChange >= config.taxAmountChangePercent ? 0.85 : 0.5;
break;
}
case 'lien_filing':
totalConfidence += 0.9;
break;
default:
totalConfidence += 0.4;
}
}
return Math.round((totalConfidence / changes.length) * 1000) / 1000;
}
export function detectChanges(
previous: PropertySnapshot,
current: PropertySnapshot,
config?: Partial<DetectionConfig>,
): ChangeDetectionResult {
const effectiveConfig = { ...DEFAULT_DETECTION_CONFIG, ...config };
const changes: PropertyChange[] = [];
const fieldsToCompare: (keyof Omit<PropertySnapshot, 'id' | 'capturedAt' | 'propertyId'>)[] = [
'ownerName',
'deedDate',
'taxId',
'taxAmount',
'lienCount',
'propertyType',
];
for (const field of fieldsToCompare) {
const oldValue = previous[field];
const newValue = current[field];
if (oldValue !== newValue) {
changes.push(classifyFieldChange(field, oldValue, newValue, effectiveConfig));
}
}
const addressChanges = detectAddressChanges(previous.address, current.address);
changes.push(...addressChanges);
const severity = determineSeverity(changes, effectiveConfig);
const confidence = computeChangeConfidence(changes, effectiveConfig);
let changeType: ChangeType = 'metadata_change';
if (changes.some(c => c.changeType === 'ownership_transfer')) {
changeType = 'ownership_transfer';
} else if (changes.some(c => c.changeType === 'deed_change')) {
changeType = 'deed_change';
} else if (changes.some(c => c.changeType === 'lien_filing')) {
changeType = 'lien_filing';
} else if (changes.some(c => c.changeType === 'tax_change')) {
changeType = 'tax_change';
}
return {
propertyId: previous.propertyId,
changeType,
severity,
confidence,
changes,
previousSnapshot: previous,
currentSnapshot: current,
detectedAt: new Date().toISOString(),
};
}
function detectAddressChanges(oldAddr: Address, newAddr: Address): PropertyChange[] {
const changes: PropertyChange[] = [];
const addressFields: (keyof Address)[] = ['streetNumber', 'streetName', 'streetType', 'unit', 'city', 'state', 'zip'];
for (const field of addressFields) {
const oldVal = oldAddr[field];
const newVal = newAddr[field];
if (oldVal !== newVal) {
changes.push({
field: `address.${field}`,
oldValue: oldVal,
newValue: newVal,
changeType: 'metadata_change',
});
}
}
return changes;
}
export function shouldTriggerAlert(result: ChangeDetectionResult, minSeverity: Severity = 'moderate'): boolean {
const severityOrder: Severity[] = ['minor', 'moderate', 'major'];
const resultIdx = severityOrder.indexOf(result.severity);
const minIdx = severityOrder.indexOf(minSeverity);
return resultIdx >= minIdx && result.confidence >= 0.7;
}
export { classifyFieldChange, determineSeverity, computeChangeConfidence };

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export {
matchRecords,
getConfigForPropertyType,
parseName,
normalizeString,
normalizeStreetType,
levenshteinDistance,
similarityScore,
} from './matcher.service';
export {
detectChanges,
shouldTriggerAlert,
classifyFieldChange,
determineSeverity,
computeChangeConfidence,
} from './change-detector';
export type {
PropertyRecord,
Address,
PropertyType,
PropertySnapshot,
MatchResult,
MatchDetails,
FieldMatch,
ChangeDetectionResult,
ChangeType,
Severity,
PropertyChange,
MatchingConfig,
DetectionConfig,
NormalizedTokens,
} from './types';

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import {
Address,
MatchResult,
MatchDetails,
FieldMatch,
MatchingConfig,
NormalizedTokens,
PropertyType,
} from './types';
const DEFAULT_CONFIG: MatchingConfig = {
nameThreshold: 0.85,
addressThreshold: 0.9,
overallThreshold: 0.85,
geocodingRadiusMeters: 100,
};
const COMMON_PREFIXES = new Set([
'mr', 'mrs', 'ms', 'miss', 'dr', 'prof', 'jr', 'sr', 'junior', 'senior',
'ii', 'iii', 'iv', 'rev', 'st', 'hon', 'esq',
]);
const COMMON_SUFFIXES = new Set([
'jr', 'sr', 'junior', 'senior', 'ii', 'iii', 'iv', 'v', 'esq',
'phd', 'md', 'llm', 'cpa',
]);
const STREET_TYPE_MAP: Record<string, string> = {
'st': 'street', 'street': 'street',
'ave': 'avenue', 'avenue': 'avenue',
'blvd': 'boulevard', 'boulevard': 'boulevard',
'dr': 'drive', 'drive': 'drive',
'ln': 'lane', 'lane': 'lane',
'ct': 'court', 'court': 'court',
'pl': 'place', 'place': 'place',
'rd': 'road', 'road': 'road',
'way': 'way',
'trl': 'trail', 'trail': 'trail',
'hwy': 'highway', 'highway': 'highway',
'pkwy': 'parkway', 'parkway': 'parkway',
'cir': 'circle', 'circle': 'circle',
'sq': 'square', 'square': 'square',
'ter': 'terrace', 'terrace': 'terrace',
};
const PROPERTY_TYPE_CONFIGS: Record<PropertyType, Partial<MatchingConfig>> = {
'residential': { nameThreshold: 0.85, addressThreshold: 0.9 },
'commercial': { nameThreshold: 0.8, addressThreshold: 0.9 },
'land': { nameThreshold: 0.8, addressThreshold: 0.85 },
'multi-family': { nameThreshold: 0.8, addressThreshold: 0.9 },
};
function levenshteinDistance(a: string, b: string): number {
const matrix: number[][] = Array.from({ length: b.length + 1 }, (_, i) =>
Array.from({ length: a.length + 1 }, (_, j) => (i === 0 ? j : j === 0 ? i : 0))
);
for (let i = 1; i <= b.length; i++) {
for (let j = 1; j <= a.length; j++) {
const cost = a[j - 1] === b[i - 1] ? 0 : 1;
matrix[i][j] = Math.min(
matrix[i - 1][j] + 1,
matrix[i][j - 1] + 1,
matrix[i - 1][j - 1] + cost,
);
}
}
return matrix[b.length][a.length];
}
function similarityScore(distance: number, maxLen: number): number {
if (maxLen === 0) return 1.0;
return 1.0 - distance / maxLen;
}
function normalizeString(str: string): string {
return str
.toLowerCase()
.replace(/[''']/g, '')
.replace(/[^a-z0-9\s]/g, ' ')
.replace(/\s+/g, ' ')
.trim();
}
function parseName(name: string): NormalizedTokens {
const clean = normalizeString(name);
const parts = clean.split(' ').filter(Boolean);
let firstName = '';
let lastName = '';
let middleName = '';
const initials: string[] = [];
if (parts.length === 0) return { firstName, lastName, middleName, initials };
let startIdx = 0;
while (startIdx < parts.length && COMMON_PREFIXES.has(parts[startIdx])) {
startIdx++;
}
let endIdx = parts.length;
while (endIdx > startIdx + 1 && COMMON_SUFFIXES.has(parts[endIdx - 1])) {
endIdx--;
}
const coreParts = parts.slice(startIdx, endIdx);
if (coreParts.length === 1) {
lastName = coreParts[0];
} else if (coreParts.length === 2) {
firstName = coreParts[0];
lastName = coreParts[1];
} else {
firstName = coreParts[0];
lastName = coreParts[coreParts.length - 1];
middleName = coreParts.slice(1, -1).join(' ');
}
if (firstName.length === 1) {
initials.push(firstName);
}
if (middleName) {
const middleParts = middleName.split(' ');
for (const mp of middleParts) {
if (mp.length === 1) initials.push(mp);
}
}
return { firstName, lastName, middleName, initials };
}
function normalizeStreetType(type: string): string {
const clean = normalizeString(type);
return STREET_TYPE_MAP[clean] || clean;
}
function normalizeAddress(addr: Address): string {
const parts = [
addr.streetNumber,
normalizeString(addr.streetName),
addr.streetType ? normalizeStreetType(addr.streetType) : '',
addr.unit ? normalizeString(addr.unit) : '',
normalizeString(addr.city),
addr.state.toLowerCase(),
addr.zip,
].filter(Boolean);
return parts.join(' ');
}
function computeFieldMatch(valueA: string, valueB: string, normalizeFn?: (v: string) => string): FieldMatch {
const normFn = normalizeFn || normalizeString;
const normalizedA = normFn(valueA);
const normalizedB = normFn(valueB);
if (!normalizedA && !normalizedB) return { valueA, valueB, normalizedA, normalizedB, score: 1.0 };
if (!normalizedA || !normalizedB) return { valueA, valueB, normalizedA, normalizedB, score: 0.0 };
if (normalizedA === normalizedB) return { valueA, valueB, normalizedA, normalizedB, score: 1.0 };
const dist = levenshteinDistance(normalizedA, normalizedB);
const maxLen = Math.max(normalizedA.length, normalizedB.length);
const score = similarityScore(dist, maxLen);
return { valueA, valueB, normalizedA, normalizedB, score: Math.round(score * 1000) / 1000 };
}
function haversineDistance(lat1: number, lon1: number, lat2: number, lon2: number): number {
const R = 6371000;
const dLat = ((lat2 - lat1) * Math.PI) / 180;
const dLon = ((lon2 - lon1) * Math.PI) / 180;
const a =
Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos((lat1 * Math.PI) / 180) *
Math.cos((lat2 * Math.PI) / 180) *
Math.sin(dLon / 2) *
Math.sin(dLon / 2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
return R * c;
}
function computeNameScore(tokensA: NormalizedTokens, tokensB: NormalizedTokens): number {
const firstScore = computeFieldMatch(tokensA.firstName, tokensB.firstName).score;
const lastScore = computeFieldMatch(tokensA.lastName, tokensB.lastName).score;
const middleScore = computeFieldMatch(tokensA.middleName, tokensB.middleName).score;
let initialMatchScore = 1.0;
if (tokensA.initials.length > 0 || tokensB.initials.length > 0) {
const allInitialsA = new Set(tokensA.initials.map(i => i.toLowerCase()));
const allInitialsB = new Set(tokensB.initials.map(i => i.toLowerCase()));
let matched = 0;
for (const init of allInitialsA) {
if (allInitialsB.has(init)) matched++;
}
const total = Math.max(allInitialsA.size, allInitialsB.size);
initialMatchScore = total > 0 ? matched / total : 1.0;
}
const weighted = (lastScore * 0.45) + (firstScore * 0.35) + (middleScore * 0.1) + (initialMatchScore * 0.1);
return Math.round(weighted * 1000) / 1000;
}
function computeAddressScore(addrA: Address, addrB: Address, config: MatchingConfig): { score: number; geocodingDistance?: number } {
const numberMatch = computeFieldMatch(addrA.streetNumber, addrB.streetNumber).score;
const streetMatch = computeFieldMatch(addrA.streetName, addrB.streetName, normalizeString).score;
const typeMatch = computeFieldMatch(
addrA.streetType ? normalizeStreetType(addrA.streetType) : '',
addrB.streetType ? normalizeStreetType(addrB.streetType) : '',
).score;
const unitMatch = computeFieldMatch(addrA.unit || '', addrB.unit || '').score;
const cityMatch = computeFieldMatch(addrA.city, addrB.city).score;
const stateMatch = computeFieldMatch(addrA.state, addrB.state).score;
const zipMatch = computeFieldMatch(addrA.zip, addrB.zip).score;
let geocodingDistance: number | undefined;
let geoScore = 0.0;
if (addrA.latitude && addrA.longitude && addrB.latitude && addrB.longitude) {
geocodingDistance = haversineDistance(addrA.latitude, addrA.longitude, addrB.latitude, addrB.longitude);
const maxDist = config.geocodingRadiusMeters;
geoScore = geocodingDistance <= maxDist ? 1.0 : Math.max(0, 1.0 - (geocodingDistance - maxDist) / (maxDist * 5));
}
const weighted =
(numberMatch * 0.2) +
(streetMatch * 0.25) +
(typeMatch * 0.1) +
(unitMatch * 0.1) +
(cityMatch * 0.1) +
(stateMatch * 0.1) +
(zipMatch * 0.1) +
(geoScore * (geocodingDistance !== undefined ? 0.05 : 0));
return { score: Math.round(weighted * 1000) / 1000, geocodingDistance };
}
export function matchRecords(
nameA: string,
addressA: Address,
nameB: string,
addressB: Address,
config?: Partial<MatchingConfig>,
): MatchResult {
const effectiveConfig = { ...DEFAULT_CONFIG, ...config };
const tokensA = parseName(nameA);
const tokensB = parseName(nameB);
const nameScore = computeNameScore(tokensA, tokensB);
const { score: addressScore, geocodingDistance } = computeAddressScore(addressA, addressB, effectiveConfig);
const overallConfidence = Math.round((nameScore * 0.5 + addressScore * 0.5) * 1000) / 1000;
const firstMatch = computeFieldMatch(tokensA.firstName, tokensB.firstName);
const lastMatch = computeFieldMatch(tokensA.lastName, tokensB.lastName);
const middleMatch = computeFieldMatch(tokensA.middleName, tokensB.middleName);
const numberMatch = computeFieldMatch(addressA.streetNumber, addressB.streetNumber);
const streetMatch = computeFieldMatch(addressA.streetName, addressB.streetName, normalizeString);
const typeMatch = computeFieldMatch(
addressA.streetType ? normalizeStreetType(addressA.streetType) : '',
addressB.streetType ? normalizeStreetType(addressB.streetType) : '',
);
const unitMatch = computeFieldMatch(addressA.unit || '', addressB.unit || '');
const cityMatch = computeFieldMatch(addressA.city, addressB.city);
const stateMatch = computeFieldMatch(addressA.state, addressB.state);
const zipMatch = computeFieldMatch(addressA.zip, addressB.zip);
const normalizedA = normalizeAddress(addressA);
const normalizedB = normalizeAddress(addressB);
const dist = levenshteinDistance(
normalizeString(nameA),
normalizeString(nameB),
);
const details: MatchDetails = {
nameNormalized: [normalizeString(nameA), normalizeString(nameB)],
addressNormalized: [normalizedA, normalizedB],
levenshteinDistance: dist,
geocodingDistance,
fields: {
firstName: firstMatch,
lastName: lastMatch,
middleName: middleMatch,
streetNumber: numberMatch,
streetName: streetMatch,
streetType: typeMatch,
unit: unitMatch,
city: cityMatch,
state: stateMatch,
zip: zipMatch,
},
};
return {
nameScore,
addressScore,
overallConfidence,
isMatch: overallConfidence >= effectiveConfig.overallThreshold,
details,
};
}
export function getConfigForPropertyType(type: PropertyType): MatchingConfig {
return { ...DEFAULT_CONFIG, ...PROPERTY_TYPE_CONFIGS[type] };
}
export { parseName, normalizeString, normalizeStreetType, levenshteinDistance, similarityScore };

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export interface PropertyRecord {
id: string;
ownerName: string;
address: Address;
deedDate?: string;
taxId?: string;
propertyType: PropertyType;
metadata?: Record<string, unknown>;
}
export interface Address {
streetNumber: string;
streetName: string;
streetType?: string;
unit?: string;
city: string;
state: string;
zip: string;
latitude?: number;
longitude?: number;
}
export type PropertyType = 'residential' | 'commercial' | 'land' | 'multi-family';
export interface PropertySnapshot {
id: string;
propertyId: string;
capturedAt: string;
ownerName: string;
address: Address;
deedDate?: string;
taxId?: string;
propertyType: PropertyType;
taxAmount?: number;
lienCount?: number;
}
export interface MatchResult {
nameScore: number;
addressScore: number;
overallConfidence: number;
isMatch: boolean;
details: MatchDetails;
}
export interface MatchDetails {
nameNormalized: string[];
addressNormalized: string[];
levenshteinDistance: number;
geocodingDistance?: number;
fields: {
firstName: FieldMatch;
lastName: FieldMatch;
middleName: FieldMatch;
streetNumber: FieldMatch;
streetName: FieldMatch;
streetType: FieldMatch;
unit: FieldMatch;
city: FieldMatch;
state: FieldMatch;
zip: FieldMatch;
};
}
export interface FieldMatch {
valueA: string;
valueB: string;
normalizedA: string;
normalizedB: string;
score: number;
}
export interface ChangeDetectionResult {
propertyId: string;
changeType: ChangeType;
severity: Severity;
confidence: number;
changes: PropertyChange[];
previousSnapshot: PropertySnapshot;
currentSnapshot: PropertySnapshot;
detectedAt: string;
}
export type ChangeType = 'tax_change' | 'deed_change' | 'ownership_transfer' | 'lien_filing' | 'metadata_change';
export type Severity = 'minor' | 'moderate' | 'major';
export interface PropertyChange {
field: string;
oldValue: unknown;
newValue: unknown;
changeType: ChangeType;
}
export interface MatchingConfig {
nameThreshold: number;
addressThreshold: number;
overallThreshold: number;
geocodingRadiusMeters: number;
}
export interface DetectionConfig {
ownershipNameThreshold: number;
deedDateSensitivity: number;
taxAmountChangePercent: number;
severityOverrides?: Record<ChangeType, Severity>;
}
export interface NormalizedTokens {
firstName: string;
lastName: string;
middleName: string;
initials: string[];
}

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import { describe, it, expect } from 'vitest';
import {
detectChanges,
shouldTriggerAlert,
determineSeverity,
computeChangeConfidence,
} from '../src/change-detector';
import { PropertySnapshot, PropertyChange, DetectionConfig } from '../src/types';
const baselineSnapshot: PropertySnapshot = {
id: 'snap-1',
propertyId: 'prop-001',
capturedAt: '2026-01-01T00:00:00Z',
ownerName: 'John Doe',
address: {
streetNumber: '123',
streetName: 'main',
streetType: 'st',
city: 'springfield',
state: 'IL',
zip: '62701',
},
deedDate: '2020-03-15',
taxId: 'tax-123',
propertyType: 'residential',
taxAmount: 2500,
lienCount: 0,
};
describe('detectChanges', () => {
it('detects ownership transfer via name change', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
ownerName: 'Jane Smith',
};
const result = detectChanges(baselineSnapshot, current);
expect(result.changeType).toBe('ownership_transfer');
expect(result.severity).toBe('major');
expect(result.changes.some(c => c.field === 'ownerName')).toBe(true);
});
it('detects deed change via deed date update', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
deedDate: '2026-01-15',
};
const result = detectChanges(baselineSnapshot, current);
expect(result.changes.some(c => c.changeType === 'deed_change')).toBe(true);
expect(result.severity).toBe('moderate');
});
it('detects tax change', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
taxAmount: 3200,
};
const result = detectChanges(baselineSnapshot, current);
expect(result.changes.some(c => c.changeType === 'tax_change')).toBe(true);
expect(result.severity).toBe('minor');
});
it('detects lien filing when lien count increases', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
lienCount: 1,
};
const result = detectChanges(baselineSnapshot, current);
expect(result.changes.some(c => c.changeType === 'lien_filing')).toBe(true);
expect(result.severity).toBe('moderate');
});
it('detects multiple changes with highest severity', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
ownerName: 'Jane Smith',
deedDate: '2026-01-15',
taxAmount: 3200,
};
const result = detectChanges(baselineSnapshot, current);
expect(result.severity).toBe('major');
expect(result.changes.length).toBeGreaterThanOrEqual(3);
});
it('returns no changes for identical snapshots', () => {
const current = { ...baselineSnapshot, id: 'snap-2', capturedAt: '2026-02-01T00:00:00Z' };
const result = detectChanges(baselineSnapshot, current);
expect(result.changes.length).toBe(0);
expect(result.severity).toBe('minor');
});
it('detects address changes as metadata changes', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
address: {
...baselineSnapshot.address,
streetNumber: '125',
},
};
const result = detectChanges(baselineSnapshot, current);
expect(result.changes.some(c => c.field === 'address.streetNumber')).toBe(true);
});
it('detects tax ID change as deed change', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
taxId: 'tax-456',
};
const result = detectChanges(baselineSnapshot, current);
expect(result.changes.some(c => c.changeType === 'deed_change')).toBe(true);
});
it('respects configurable ownership threshold', () => {
const config: DetectionConfig = {
ownershipNameThreshold: 0.5,
deedDateSensitivity: 0.9,
taxAmountChangePercent: 15,
};
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
ownerName: 'Jon Doe',
};
const result = detectChanges(baselineSnapshot, current, config);
expect(result.changes.some(c => c.field === 'ownerName')).toBe(true);
});
it('populates previous and current snapshots in result', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
ownerName: 'Jane Smith',
};
const result = detectChanges(baselineSnapshot, current);
expect(result.previousSnapshot).toBe(baselineSnapshot);
expect(result.currentSnapshot).toBe(current);
});
it('includes detectedAt timestamp', () => {
const current = {
...baselineSnapshot,
id: 'snap-2',
capturedAt: '2026-02-01T00:00:00Z',
ownerName: 'Jane Smith',
};
const result = detectChanges(baselineSnapshot, current);
expect(result.detectedAt).toBeDefined();
expect(new Date(result.detectedAt).getTime()).toBeGreaterThan(0);
});
});
describe('shouldTriggerAlert', () => {
it('triggers for major severity above default threshold', () => {
const result = {
propertyId: 'prop-001',
changeType: 'ownership_transfer' as const,
severity: 'major' as const,
confidence: 0.95,
changes: [],
previousSnapshot: baselineSnapshot,
currentSnapshot: baselineSnapshot,
detectedAt: new Date().toISOString(),
};
expect(shouldTriggerAlert(result)).toBe(true);
});
it('triggers for moderate severity with high confidence', () => {
const result = {
propertyId: 'prop-001',
changeType: 'deed_change' as const,
severity: 'moderate' as const,
confidence: 0.85,
changes: [],
previousSnapshot: baselineSnapshot,
currentSnapshot: baselineSnapshot,
detectedAt: new Date().toISOString(),
};
expect(shouldTriggerAlert(result)).toBe(true);
});
it('does not trigger for minor severity with default threshold', () => {
const result = {
propertyId: 'prop-001',
changeType: 'tax_change' as const,
severity: 'minor' as const,
confidence: 0.85,
changes: [],
previousSnapshot: baselineSnapshot,
currentSnapshot: baselineSnapshot,
detectedAt: new Date().toISOString(),
};
expect(shouldTriggerAlert(result)).toBe(false);
});
it('does not trigger when confidence below 0.7', () => {
const result = {
propertyId: 'prop-001',
changeType: 'deed_change' as const,
severity: 'moderate' as const,
confidence: 0.5,
changes: [],
previousSnapshot: baselineSnapshot,
currentSnapshot: baselineSnapshot,
detectedAt: new Date().toISOString(),
};
expect(shouldTriggerAlert(result)).toBe(false);
});
it('triggers minor when minSeverity set to minor', () => {
const result = {
propertyId: 'prop-001',
changeType: 'tax_change' as const,
severity: 'minor' as const,
confidence: 0.85,
changes: [],
previousSnapshot: baselineSnapshot,
currentSnapshot: baselineSnapshot,
detectedAt: new Date().toISOString(),
};
expect(shouldTriggerAlert(result, 'minor')).toBe(true);
});
});
describe('determineSeverity', () => {
it('returns major when ownership transfer present', () => {
const changes: PropertyChange[] = [
{ field: 'ownerName', oldValue: 'John', newValue: 'Jane', changeType: 'ownership_transfer' },
];
expect(determineSeverity(changes, { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 })).toBe('major');
});
it('returns moderate when only deed change', () => {
const changes: PropertyChange[] = [
{ field: 'deedDate', oldValue: '2020-01-01', newValue: '2026-01-01', changeType: 'deed_change' },
];
expect(determineSeverity(changes, { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 })).toBe('moderate');
});
it('returns minor when only metadata changes', () => {
const changes: PropertyChange[] = [
{ field: 'propertyType', oldValue: 'residential', newValue: 'commercial', changeType: 'metadata_change' },
];
expect(determineSeverity(changes, { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 })).toBe('minor');
});
it('respects severity overrides', () => {
const changes: PropertyChange[] = [
{ field: 'taxAmount', oldValue: 1000, newValue: 2000, changeType: 'tax_change' },
];
const config: DetectionConfig = {
ownershipNameThreshold: 0.7,
deedDateSensitivity: 0.9,
taxAmountChangePercent: 15,
severityOverrides: { tax_change: 'moderate' },
};
expect(determineSeverity(changes, config)).toBe('moderate');
});
});
describe('computeChangeConfidence', () => {
it('returns 0 for empty changes', () => {
expect(computeChangeConfidence([], { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 })).toBe(0);
});
it('returns high confidence for ownership transfer', () => {
const changes: PropertyChange[] = [
{ field: 'ownerName', oldValue: 'John', newValue: 'Jane', changeType: 'ownership_transfer' },
];
const conf = computeChangeConfidence(changes, { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 });
expect(conf).toBeCloseTo(0.95, 2);
});
it('returns high confidence for lien filing', () => {
const changes: PropertyChange[] = [
{ field: 'lienCount', oldValue: 0, newValue: 1, changeType: 'lien_filing' },
];
const conf = computeChangeConfidence(changes, { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 });
expect(conf).toBeCloseTo(0.9, 2);
});
it('averages confidence across multiple changes', () => {
const changes: PropertyChange[] = [
{ field: 'ownerName', oldValue: 'John', newValue: 'Jane', changeType: 'ownership_transfer' },
{ field: 'taxAmount', oldValue: 1000, newValue: 2000, changeType: 'tax_change' },
];
const conf = computeChangeConfidence(changes, { ownershipNameThreshold: 0.7, deedDateSensitivity: 0.9, taxAmountChangePercent: 15 });
expect(conf).toBeGreaterThan(0.7);
expect(conf).toBeLessThan(1.0);
});
});

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import { describe, it, expect } from 'vitest';
import {
matchRecords,
parseName,
normalizeString,
normalizeStreetType,
levenshteinDistance,
similarityScore,
getConfigForPropertyType,
} from '../src/matcher.service';
import { Address } from '../src/types';
const baselineAddress: Address = {
streetNumber: '123',
streetName: 'main',
streetType: 'st',
unit: 'apt 4b',
city: 'springfield',
state: 'IL',
zip: '62701',
latitude: 39.7817,
longitude: -89.6501,
};
describe('levenshteinDistance', () => {
it('returns 0 for identical strings', () => {
expect(levenshteinDistance('hello', 'hello')).toBe(0);
});
it('computes distance for different strings', () => {
expect(levenshteinDistance('kitten', 'sitting')).toBe(3);
});
it('handles empty strings', () => {
expect(levenshteinDistance('', 'hello')).toBe(5);
expect(levenshteinDistance('hello', '')).toBe(5);
});
it('handles single character differences', () => {
expect(levenshteinDistance('cat', 'bat')).toBe(1);
});
});
describe('similarityScore', () => {
it('returns 1.0 for zero distance', () => {
expect(similarityScore(0, 5)).toBe(1.0);
});
it('returns 0.0 when distance equals max length', () => {
expect(similarityScore(5, 5)).toBe(0.0);
});
it('returns 1.0 for empty strings', () => {
expect(similarityScore(0, 0)).toBe(1.0);
});
});
describe('normalizeString', () => {
it('lowercases and trims', () => {
expect(normalizeString(' Hello World ')).toBe('hello world');
});
it('removes special characters', () => {
expect(normalizeString('O\'Brien-Jr!')).toBe('obrien jr');
});
it('collapses multiple spaces', () => {
expect(normalizeString('John Doe')).toBe('john doe');
});
});
describe('parseName', () => {
it('parses first and last name', () => {
const tokens = parseName('John Doe');
expect(tokens.firstName).toBe('john');
expect(tokens.lastName).toBe('doe');
expect(tokens.middleName).toBe('');
});
it('parses name with middle name', () => {
const tokens = parseName('John Robert Doe');
expect(tokens.firstName).toBe('john');
expect(tokens.lastName).toBe('doe');
expect(tokens.middleName).toBe('robert');
});
it('strips prefixes', () => {
const tokens = parseName('Dr. John Doe');
expect(tokens.firstName).toBe('john');
expect(tokens.lastName).toBe('doe');
});
it('strips suffixes', () => {
const tokens = parseName('John Doe Jr');
expect(tokens.firstName).toBe('john');
expect(tokens.lastName).toBe('doe');
});
it('handles single name', () => {
const tokens = parseName('Madonna');
expect(tokens.lastName).toBe('madonna');
expect(tokens.firstName).toBe('');
});
it('extracts initials from middle names', () => {
const tokens = parseName('John M Doe');
expect(tokens.initials).toContain('m');
});
it('handles empty name', () => {
const tokens = parseName('');
expect(tokens.firstName).toBe('');
expect(tokens.lastName).toBe('');
expect(tokens.middleName).toBe('');
});
});
describe('normalizeStreetType', () => {
it('expands abbreviations', () => {
expect(normalizeStreetType('st')).toBe('street');
expect(normalizeStreetType('ave')).toBe('avenue');
expect(normalizeStreetType('blvd')).toBe('boulevard');
expect(normalizeStreetType('ct')).toBe('court');
expect(normalizeStreetType('ln')).toBe('lane');
expect(normalizeStreetType('dr')).toBe('drive');
});
it('normalizes full names', () => {
expect(normalizeStreetType('Street')).toBe('street');
expect(normalizeStreetType('Avenue')).toBe('avenue');
});
it('passes through unknown types', () => {
expect(normalizeStreetType('way')).toBe('way');
});
});
describe('matchRecords', () => {
it('matches identical records with high confidence', () => {
const result = matchRecords(
'John Doe',
{ ...baselineAddress },
'John Doe',
{ ...baselineAddress },
);
expect(result.nameScore).toBeCloseTo(1.0, 2);
expect(result.addressScore).toBeGreaterThan(0.95);
expect(result.isMatch).toBe(true);
});
it('matches names with different prefixes', () => {
const result = matchRecords(
'Dr. John Doe',
{ ...baselineAddress },
'John Doe',
{ ...baselineAddress },
);
expect(result.nameScore).toBeGreaterThan(0.8);
expect(result.isMatch).toBe(true);
});
it('matches names with different suffixes', () => {
const result = matchRecords(
'John Doe Jr',
{ ...baselineAddress },
'John Doe',
{ ...baselineAddress },
);
expect(result.nameScore).toBeGreaterThan(0.8);
});
it('matches names with typos via Levenshtein', () => {
const result = matchRecords(
'Jhon Doe',
{ ...baselineAddress },
'John Doe',
{ ...baselineAddress },
);
expect(result.nameScore).toBeGreaterThan(0.7);
expect(result.details.levenshteinDistance).toBeGreaterThan(0);
});
it('handles middle initial matching', () => {
const result = matchRecords(
'John M Doe',
{ ...baselineAddress },
'John Michael Doe',
{ ...baselineAddress },
);
expect(result.nameScore).toBeGreaterThan(0.7);
});
it('matches addresses with different street type formats', () => {
const addrA: Address = { ...baselineAddress, streetType: 'st' };
const addrB: Address = { ...baselineAddress, streetType: 'street' };
const result = matchRecords('John Doe', addrA, 'John Doe', addrB);
expect(result.addressScore).toBeGreaterThan(0.9);
});
it('uses geocoding proximity when coordinates available', () => {
const addrA: Address = {
...baselineAddress,
latitude: 39.7817,
longitude: -89.6501,
};
const addrB: Address = {
...baselineAddress,
latitude: 39.782,
longitude: -89.6505,
};
const result = matchRecords('John Doe', addrA, 'John Doe', addrB);
expect(result.details.geocodingDistance).toBeDefined();
expect(result.details.geocodingDistance!).toBeLessThan(100);
});
it('returns false for completely different records', () => {
const result = matchRecords(
'John Doe',
baselineAddress,
'Jane Smith',
{
streetNumber: '999',
streetName: 'oak',
streetType: 'ave',
city: 'chicago',
state: 'IL',
zip: '60601',
},
);
expect(result.isMatch).toBe(false);
});
it('provides detailed field-level match info', () => {
const result = matchRecords(
'John Doe',
baselineAddress,
'John Doe',
baselineAddress,
);
expect(result.details.fields.firstName.score).toBe(1.0);
expect(result.details.fields.lastName.score).toBe(1.0);
expect(result.details.fields.streetNumber.score).toBe(1.0);
});
it('reports normalized address strings', () => {
const result = matchRecords(
'John Doe',
baselineAddress,
'John Doe',
baselineAddress,
);
expect(result.details.addressNormalized[0]).toBe(result.details.addressNormalized[1]);
});
});
describe('getConfigForPropertyType', () => {
it('returns residential config with higher thresholds', () => {
const config = getConfigForPropertyType('residential');
expect(config.nameThreshold).toBe(0.85);
expect(config.addressThreshold).toBe(0.9);
});
it('returns commercial config with lower name threshold', () => {
const config = getConfigForPropertyType('commercial');
expect(config.nameThreshold).toBe(0.8);
});
it('returns land config with lower address threshold', () => {
const config = getConfigForPropertyType('land');
expect(config.addressThreshold).toBe(0.85);
});
});

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{
"extends": "../../tsconfig.json",
"compilerOptions": {
"outDir": "./dist",
"rootDir": "./src"
},
"include": ["src/**/*.ts"]
}

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import { defineConfig } from 'vitest/config';
export default defineConfig({
test: {
globals: true,
environment: 'node',
include: ['src/**/*.test.ts', 'test/**/*.test.ts'],
coverage: {
provider: 'v8',
reporter: ['text', 'json', 'html', 'lcov'],
reportsDirectory: './coverage',
include: ['src/**/*.ts'],
exclude: [
'src/**/*.d.ts',
'**/node_modules/**',
'**/test/**',
],
thresholds: {
statements: 80,
branches: 80,
functions: 80,
lines: 80,
},
},
},
});