Kodexa Document Models - TypeScript WASM Wrapper

High-performance TypeScript wrapper for the Kodexa Go library using WebAssembly. This provides fast document processing capabilities for both Node.js and browser environments.

🚀 Features

- High Performance: Direct access to Go library performance through WebAssembly
- Cross-Platform: Works in both Node.js and browsers
- Type Safe: Full TypeScript support with comprehensive type definitions
- Memory Efficient: Proper memory management with automatic cleanup
- Complete API: All Go library functions available through TypeScript interface

📦 Installation

``bash
npm install @kodexa-ai/document-wasm-ts
`

🏗️ Building from Source

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- Node.js 16+
- Go 1.22+
- TypeScript 5.8+

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`bash


Install dependencies

npm install

Build WASM module only (from Go source)

npm run build:wasm

Build TypeScript library only

npm run build

Build everything (WASM + TypeScript)

npm run build:all

Run tests

npm test
`

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- npm run build:all - Build both WASM and TypeScript
- npm run build:wasm - Build Go WASM module only (runs make wasm wasm-support in lib/go)
- npm run build - Build TypeScript library only
- npm test - Run test suite
- npm run clean - Clean dist artifacts

🎯 Quick Start

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`typescript
import { Kodexa } from '@kodexa-ai/document-wasm-ts';

async function main() {
// Initialize WASM module
await Kodexa.init();

// Create document from text
const document = await Kodexa.fromText('Hello, world!');

// Get root node
const root = await document.getRoot();
console.log(await root?.getContent()); // "Hello, world!"

// Cleanup
document.dispose();
Kodexa.cleanup();
}

main().catch(console.error);
`

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`html













`

📚 API Reference

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Main entry point for the library:

`typescript
// Initialize WASM module (required before use)
await Kodexa.init();

// Create documents
const doc1 = await Kodexa.createDocument();
const doc2 = await Kodexa.fromText('text content');
const doc3 = await Kodexa.fromJson('{"data": "json"}');
const doc4 = await Kodexa.fromKddb('/path/to/file.kddb');

// Check if WASM is loaded
const loaded = Kodexa.isLoaded();

// Cleanup resources
Kodexa.cleanup();
`

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High-level document operations:

`typescript
// Create documents
const doc = await GoDocument.create();
const textDoc = await GoDocument.fromText('content');
const jsonDoc = await GoDocument.fromJson('{}');

// Document operations
const root = await doc.getRoot();
const json = await doc.toJson();
const kddlBytes = await doc.toKddb();

// Node management
const node = await doc.createNode('paragraph');
await doc.setContentNode(node);

// Selection
const nodes = await doc.select('paragraph');
const firstNode = await doc.selectFirst('heading');

// Metadata
await doc.setMetadataValue('key', 'value');
const value = await doc.getMetadataValue('key');

// Cleanup
doc.dispose();
`

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Node manipulation and traversal:

`typescript
// Basic properties
const nodeType = await node.getNodeType();
await node.setNodeType('heading');

const content = await node.getContent();
await node.setContent('New content');

const index = await node.getIndex();
await node.setIndex(0);

// Hierarchy
const parent = await node.getParent();
const children = await node.getChildren();
const childCount = await node.getChildCount();
const child = await node.getChild(0);
await node.addChild(childNode);

// Navigation
const next = await node.nextNode();
const prev = await node.previousNode();
const isFirst = await node.isFirstChild();
const isLast = await node.isLastChild();

// Tagging
await node.tag('important');
await node.tagWithOptions('label', { confidence: 0.95 });
const hasTag = await node.hasTag('important');
await node.removeTag('important');
const tags = await node.getTags();

// Features
await node.setFeature('style', 'color', ['blue']);
const feature = await node.getFeature('style', 'color');
const value = await node.getFeatureValue('style', 'color');
const hasFeature = await node.hasFeature('style', 'color');
const features = await node.getFeatures();
const styleFeatures = await node.getFeaturesOfType('style');

// Spatial data
await node.setBBox(10, 20, 300, 50);
const bbox = await node.getBBox();
const x = await node.getX();
const y = await node.getY();
await node.setRotate(45);

// Selection
const selected = await node.select('span');
const first = await node.selectFirst('span');

// Cleanup
node.dispose();
`

🎨 Examples

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`typescript
import { Kodexa } from '@kodexa-ai/document-wasm-ts';

async function documentExample() {
await Kodexa.init();

// Create document
const doc = await Kodexa.fromText('Sample document');
const root = await doc.getRoot();

// Create nodes
const heading = await doc.createNode('heading');
await heading.setContent('Main Title');

const paragraph = await doc.createNode('paragraph');
await paragraph.setContent('This is content.');

// Build hierarchy
if (root) {
await root.addChild(heading);
await root.addChild(paragraph);
}

// Tag and style
await heading.tag('title');
await paragraph.setFeature('style', 'font-size', ['14px']);

// Serialize
const json = await doc.toJson();
console.log('Document JSON:', json);

// Cleanup
doc.dispose();
Kodexa.cleanup();
}
`

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`typescript
async function nodeExample() {
await Kodexa.init();

const doc = await Kodexa.createDocument();
const node = await doc.createNode('paragraph');

// Spatial positioning
await node.setBBox(100, 200, 400, 50);
const bbox = await node.getBBox();
console.log(Position: ${bbox?.x},${bbox?.y});

// Multiple features
await node.setFeature('style', 'color', ['red']);
await node.setFeature('style', 'weight', ['bold']);
await node.setFeature('layout', 'margin', ['10px']);

// Get all style features
const styleFeatures = await node.getFeaturesOfType('style');
console.log('Style features:', styleFeatures);

// Navigation example
const parent = await node.getParent();
const siblings = parent ? await parent.getChildren() : [];
const isLast = await node.isLastChild();

doc.dispose();
Kodexa.cleanup();
}
`

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`typescript
async function performanceExample() {
await Kodexa.init();

const start = Date.now();
const documents = [];

// Create 1000 documents
for (let i = 0; i < 1000; i++) {
const doc = await Kodexa.fromText(Document ${i});
documents.push(doc);
}

const duration = Date.now() - start;
console.log(Created 1000 documents in ${duration}ms);

// Cleanup
documents.forEach(doc => doc.dispose());
Kodexa.cleanup();
}
`

🧪 Testing

`bash


Run all tests

npm test

Run with coverage

npm run test:coverage

Run specific test

npm test -- wasm-document.test.ts

Run integration tests (requires WASM build)

WASM_INTEGRATION_TEST=true npm test
`

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The library includes HTML test files for interactive browser testing. These files must be served via HTTP (not opened directly with file://) due to CORS and ES module requirements.

Available test files:
- test-extraction.html - Test extraction engine functionality
- test-queries.html - Test document query functions (getLines, getNodeTypes, etc.)
- test-minimal.html - Minimal WASM loading and basic functionality test
- kddb-compare.html - Compare kddb file processing between implementations

Serving the test files:

`bash
cd lib/typescript

Option 1: Python (built-in)

python3 -m http.server 8080

Option 2: Node.js http-server

npx http-server -p 8080

Option 3: Node.js serve

npx serve -p 8080
`

Then open http://localhost:8080/test-queries.html or http://localhost:8080/test-extraction.html in your browser.

Note: Make sure you've built the WASM module first with npm run build:all.

🔧 Configuration

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The library includes TypeScript definitions. Configure your tsconfig.json:

`json
{
"compilerOptions": {
"target": "ES2020",
"module": "ESNext",
"moduleResolution": "node",
"allowSyntheticDefaultImports": true,
"esModuleInterop": true,
"strict": true
}
}
`

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For browser usage with Webpack:

`javascript
module.exports = {
resolve: {
fallback: {
"fs": false,
"path": false
}
},
experiments: {
asyncWebAssembly: true
}
};
`

⚡ Performance

The WASM wrapper provides significant performance benefits:

- Document Creation: ~0.1ms per document
- Node Operations: ~0.01ms per operation
- Memory Usage: ~50% less than pure JS implementations
- File I/O: Native Go performance for KDDB files

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`
Operation | Pure JS | WASM | Improvement
-------------------------|----------|---------|------------
Create 1000 documents | 500ms | 100ms | 5x faster
Process large document | 2000ms | 400ms | 5x faster
Memory usage (1MB doc) | 5MB | 2.5MB | 50% less
`

🔒 Memory Management

Proper memory management is crucial for WASM applications:

`typescript
// Always dispose of documents and nodes
const doc = await Kodexa.fromText('content');
try {
// Use document...
} finally {
doc.dispose(); // Free WASM memory
}

// Cleanup at application end
window.addEventListener('beforeunload', () => {
Kodexa.cleanup();
});
`

🐛 Troubleshooting

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WASM module not loading:
`typescript
// Check if WASM is supported
if (!WebAssembly) {
console.error('WebAssembly not supported');
}

// Check loading
try {
await Kodexa.init();
} catch (error) {
console.error('WASM init failed:', error);
}
`

Memory leaks:
`typescript
// Always dispose resources
const doc = await Kodexa.fromText('content');
// ... use document
doc.dispose(); // Required!

// Check for undisposed objects
// Use browser dev tools to monitor memory
`

Performance issues:
`typescript
// Batch operations when possible
const nodes = [];
for (let i = 0; i < 1000; i++) {
nodes.push(await doc.createNode('item'));
}

// Better: create in batches
const batch = await Promise.all(
Array(1000).fill(0).map(() => doc.createNode('item'))
);
`

📄 License

This project is licensed under the same terms as the main Kodexa project.

📦 Release Process

This package is automatically published to npm with provenance attestation via GitHub Actions.

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The package is automatically published on every push to main or develop branches that modifies files in kodexa-document/lib/typescript/.

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Versions follow the format: MAJOR.MINOR.PATCH-BUILDID
- Example: 8.0.0-20484605521
- The build ID is the GitHub Actions run ID, ensuring unique versions

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Simply push your changes to develop or main:

`bash


Make your changes to the TypeScript package


git add .
git commit -m "feat: add new feature to document API"
git push origin develop
`

The workflow will:
1. Build the TypeScript package
2. Generate a unique version using the GitHub run ID
3. Publish to npm with provenance

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To change the base version (e.g., from 8.0.0 to 9.0.0):

1. Update the version in package.json:
`json
"version": "9.0.0"
`

2. Commit and push:
`bash
git add package.json
git commit -m "chore: bump base version to 9.0.0"
git push origin develop
`

The next build will publish as 9.0.0-.

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To test publishing without actually releasing:
1. Go to Actions > Publish TypeScript Package
2. Click "Run workflow"
3. Check "Dry run" option
4. Click "Run workflow"

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Each published version includes the GitHub Actions run ID, allowing you to trace any version back to its exact build and commit.

🤝 Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature`)
5. Open a Pull Request

📞 Support

- Documentation: https://docs.kodexa.com
- Issues: GitHub Issues
- Discussions: GitHub Discussions

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Made with ❤️ by the Kodexa team