nextapps-de · suyashj1231 · Jan 11, 2026
diff --git a/ISSUE_509_IMPLEMENTATION.md b/ISSUE_509_IMPLEMENTATION.md
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+# Issue #509 Implementation Summary
+
+## Overview
+This implementation adds two features requested in issue #509:
+1. **Expose search score in search results**
+2. **Export/Import IndexedDB index to JSON**
+
+## Changes Made
+
+### 1. Score Exposure Feature
+
+#### Files Modified:
+- `src/type.js` - Added `score` option to `SearchOptions` typedef
+- `src/index/search.js` - Added score parameter handling throughout search flow
+- `src/intersect.js` - Modified to track and return scores when enabled
+- `src/resolve/default.js` - Updated to handle score results
+- `index.d.ts` - Added TypeScript definitions for score option
+
+#### How It Works:
+- When `score: true` is passed in search options, results are returned as objects with `{id, score}` instead of plain IDs
+- Score is calculated based on the resolution slot (higher resolution - slot index = higher score)
+- Scores represent relevance: higher scores indicate better matches
+- Works with single-term, multi-term, and suggestion queries
+
+#### Usage:
+```javascript
+const index = new Index();
+index.add(1, "hello world");
+index.add(2, "hello flexsearch");
+
+// Get results with scores
+const results = index.search("hello", { score: true, limit: 10 });
+// Returns: [{id: 1, score: 9}, {id: 2, score: 8}]
+
+// Get results without scores (default)
+const results2 = index.search("hello", { limit: 10 });
+// Returns: [1, 2]
+```
+
+### 2. IndexedDB Export/Import Feature
+
+#### Files Modified:
+- `src/db/indexeddb/index.js` - Added `export()` and `import()` methods
+- `index.d.ts` - Added TypeScript definitions for export/import methods
+
+#### How It Works:
+- `export()` method exports all IndexedDB data to JSON format
+- `import()` method imports JSON data back into IndexedDB
+- Handles all IndexedDB stores: map, ctx, tag, reg, cfg
+- Supports field-specific data for document indexes
+
+#### Usage:
+```javascript
+const db = new IndexedDB("my-index");
+const index = new Index({ db: db });
+
+await index.mount(db);
+index.add(1, "hello world");
+index.add(2, "hello flexsearch");
+await index.commit();
+
+// Export to JSON
+await db.export(function(key, data) {
+    // key = "indexeddb.json"
+    // data = JSON string containing all index data
+    console.log("Exported:", data);
+    // Save to file or send to server
+});
+
+// Import from JSON
+const jsonData = '{"id":"my-index","data":{...}}';
+await db.import("indexeddb.json", jsonData);
+```
+
+## Testing
+
+### Run Tests:
+```bash
+# Build the project first
+npm run build:bundle
+
+# Run the specific test file
+cd test
+npm test score-export.js
+```
+
+### Manual Testing:
+
+#### Test Score Exposure:
+```javascript
+const { Index } = require("./dist/flexsearch.bundle.min.js");
+
+const index = new Index();
+index.add(1, "hello world");
+index.add(2, "hello flexsearch");
+index.add(3, "world peace");
+
+// Test with scores
+const results = index.search("hello", { score: true });
+console.log("Results with scores:", results);
+// Should output: [{id: 1, score: 9}, {id: 2, score: 9}]
+
+// Test without scores
+const results2 = index.search("hello");
+console.log("Results without scores:", results2);
+// Should output: [1, 2]
+```
+
+#### Test IndexedDB Export/Import (Browser):
+```html
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="../dist/flexsearch.bundle.min.js"></script>
+</head>
+<body>
+    <script>
+        const { Index, IndexedDB } = FlexSearch;
+
+        async function test() {
+            // Create and populate index
+            const db = new IndexedDB("test-export");
+            const index = new Index({ db: db });
+
+            await index.mount(db);
+            index.add(1, "hello world");
+            index.add(2, "hello flexsearch");
+            await index.commit();
+
+            // Export
+            let exportedData = null;
+            await db.export(function(key, data) {
+                exportedData = data;
+                console.log("Exported:", JSON.parse(data));
+            });
+
+            // Import to new database
+            const db2 = new IndexedDB("test-import");
+            const index2 = new Index({ db: db2 });
+            await index2.mount(db2);
+            await db2.import("indexeddb.json", exportedData);
+
+            // Verify
+            const results = await index2.search("hello");
+            console.log("Imported results:", results);
+        }
+
+        test();
+    </script>
+</body>
+</html>
+```
+
+## Notes
+
+1. **Score Calculation**: Scores are based on resolution slots. Lower slot index = higher score (better match). The score is normalized as `resolution - slotIndex`.
+
+2. **Backward Compatibility**: Both features are opt-in:
+   - Score exposure requires `score: true` option
+   - Export/import are new methods that don't affect existing functionality
+
+3. **IndexedDB Limitations**: 
+   - Export/import only works in browser environments
+   - Large indexes may take time to export/import
+   - The export format includes all stores (map, ctx, tag, reg, cfg)
+
+4. **TypeScript Support**: Full TypeScript definitions are included in `index.d.ts`
+
+## Files Changed Summary
+
+1. `src/type.js` - Added score to SearchOptions
+2. `src/index/search.js` - Score parameter propagation
+3. `src/intersect.js` - Score tracking and calculation
+4. `src/resolve/default.js` - Score result handling
+5. `src/db/indexeddb/index.js` - Export/import methods
+6. `index.d.ts` - TypeScript definitions
+7. `test/score-export.js` - Test suite
+
+## Next Steps
+
+1. Build the project: `npm run build:all`
+2. Run tests: `cd test && npm test score-export.js`
+3. Test manually in browser for IndexedDB features
+4. Submit PR with these changes