@oxc-parser/wasm v0.34.0
About
Experimental wasm package for the oxc parser, with full TypeScript typings support.
This package is built with different wasm-pack's target builds:
wasm-pack build --target web
for bundler (webpack / vite) consumption.wasm-pack build --target nodejs
for node.js
And exports the files as
"main": "./node/oxc_parser_wasm.js",
"browser": "./web/oxc_parser_wasm.js",
"types": "./node/oxc_parser_wasm.d.ts",
Checkout oxc-parser for usage in node.js via napi bindings.
Source code: https://github.com/oxc-project/oxc/tree/main/wasm/parser
Usage
import initWasm, { parseSync } from '@oxc-parser/wasm';
async function main() {
await initWasm();
const code = 'let foo';
const result = parseSync(code, { sourceFilename: 'test.ts' });
console.log(result);
}
main();
Notes
UTF8 vs UTF16 byte offsets
The span
value returned from the ASTs and diagnostics is in UTF8 byte offsets. Converting to UTF16 byte offsets:
let sourceTextUtf8 = new TextEncoder().encode(sourceText);
const convertToUtf8 = (sourceTextUtf8, d) => {
return new TextDecoder().decode(sourceTextUtf8.slice(0, d)).length;
};
const diagnostics = result.errors.map((d) => ({
from: convertToUtf8(sourceTextUtf8, d.start),
to: convertToUtf8(sourceTextUtf8, d.end),
severity: d.severity.toLowerCase(),
message: d.message,
}));
Vite
wasm-pack build --target web
is used for the wasm build.
You may need something like https://github.com/nshen/vite-plugin-wasm-pack to get it working with vite,
otherwise vite will load the wasm file as a HTML file causing a CompileError: WebAssembly.instantiate(): expected magic word
error.
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