alexion
6081e3e325
Imported as a linear vendor commit so forge rebases do not replay the upstream root tree. git-subtree-dir: third_party/pi git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0
36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
import { readFile } from "node:fs/promises";
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import { createRequire } from "node:module";
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/**
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* A compiled `WebAssembly.Module` of `quickjs-wasi/quickjs.wasm`. Typed opaquely because the Node
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* type definitions do not declare the WebAssembly globals (they live in the DOM lib).
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*/
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export type CodemodeWasmModule = object;
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interface WebAssemblyGlobal {
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compile(bytes: Uint8Array): Promise<CodemodeWasmModule>;
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}
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const modules = new Map<string, Promise<CodemodeWasmModule>>();
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/**
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* Read and compile the QuickJS wasm once per path. `path` defaults to the file in the installed
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* `quickjs-wasi` package; pass it when that file lives elsewhere, for example embedded in a Bun
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* compiled executable. A failed load is retried on the next call.
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*/
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export function loadQuickJSWasm(path?: string): Promise<CodemodeWasmModule> {
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const resolved = path ?? createRequire(import.meta.url).resolve("quickjs-wasi/quickjs.wasm");
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let module = modules.get(resolved);
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if (!module) {
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const { WebAssembly } = globalThis as unknown as { WebAssembly: WebAssemblyGlobal };
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module = readFile(resolved)
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.then((bytes) => WebAssembly.compile(bytes))
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.catch((error: unknown) => {
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modules.delete(resolved);
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throw error;
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});
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modules.set(resolved, module);
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}
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return module;
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}
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