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Init Wasm module only once in browsers #615

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Merged
devongovett merged 2 commits into from
Oct 30, 2023
Merged

Init Wasm module only once in browsers #615

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48af744
Init Wasm module only once in browsers
mischnic Oct 27, 2023
f168549
Init Wasm only once when loading multiple times
mischnic Oct 28, 2023
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25 changes: 15 additions & 10 deletions wasm/index.mjs
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Original file line number Diff line number Diff line change
@@ -1,24 +1,29 @@
import { Environment, napi } from 'napi-wasm';
import { await_promise_sync, createBundleAsync } from './async.mjs';

let wasm, bundleAsyncInternal;
let wasm, initPromise, bundleAsyncInternal;

export default async function init(input) {
if (wasm) return;
if (initPromise) {
await initPromise;
return;
}

input = input ?? new URL('lightningcss_node.wasm', import.meta.url);
if (typeof input === 'string' || (typeof Request === 'function' && input instanceof Request) || (typeof URL === 'function' && input instanceof URL)) {
input = fetchOrReadFromFs(input);
}

const { instance } = await load(await input, {
env: {
...napi,
await_promise_sync
}
});
initPromise = input
.then(input => load(input, {env: {...napi, await_promise_sync}}))
.then(({instance}) => {
let env = new Environment(instance);
bundleAsyncInternal = createBundleAsync(env);
wasm = env.exports;
});

let env = new Environment(instance);
wasm = env.exports;
bundleAsyncInternal = createBundleAsync(env);
await initPromise;
}

export function transform(options) {
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