70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
# decodal-wasm
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WebAssembly runtime package for Decodal.
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This package exposes the Decodal evaluator and shared language service to browsers and other JavaScript runtimes that can load WebAssembly modules.
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It is generated from the Rust crate in `crates/decodal-wasm` with `wasm-pack` and is used by the official playground.
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Use `decodal-codemirror` separately when you need CodeMirror 6 language support.
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## Install
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```sh
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npm install decodal-wasm
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```
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JSR:
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```sh
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deno add jsr:@hare/decodal-wasm
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```
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## Usage
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```js
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import init, { DecodalLanguageService } from 'decodal-wasm';
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await init();
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const files = {
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'main.dcdl': 'let schema = import "./schema.dcdl"; in schema.Server',
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'schema.dcdl': 'Server = App.Server & { port = 8080; };',
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};
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const service = new DecodalLanguageService({
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globals: {
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App: {
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Server: {
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port: { $decodal: 'Int' },
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},
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},
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},
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loadImport(_currentKey, specifier) {
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const key = specifier.startsWith('./') ? specifier.slice(2) : specifier;
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return { kind: 'source', key, name: key, source: files[key] };
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},
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completeImport() {
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return ['./schema.dcdl'];
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},
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});
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const result = service.evaluate('main.dcdl', 'main.dcdl', files['main.dcdl']);
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console.log(JSON.parse(result));
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const completion = service.complete(
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'main.dcdl',
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'App.Server.po',
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'App.Server.po'.length,
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false,
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);
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console.log(JSON.parse(completion));
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```
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`globals`, `loadImport`, and `completeImport` are host-owned. The package does not assume a filesystem or virtual project model. Import callbacks are synchronous; preload or cache remote content before evaluation.
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Plain strings, numbers, booleans, arrays, and objects are concrete host values. Use `{ $decodal: 'String' | 'Int' | 'Float' | 'Bool' }` for primitive schemas and `{ $decodal: 'Array', item: value }` for array schemas. Descriptors also accept `constraints` and `default`.
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Methods return JSON strings so callers can handle diagnostics and successful results without depending on Rust data structures.
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