chore(vendor): import pi 1.3.0

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

third_party/pi/packages/codemode/src/wasm.ts

@@ -0,0 +1,35 @@
+import { readFile } from "node:fs/promises";
+import { createRequire } from "node:module";
+
+/**
+ * A compiled `WebAssembly.Module` of `quickjs-wasi/quickjs.wasm`. Typed opaquely because the Node
+ * type definitions do not declare the WebAssembly globals (they live in the DOM lib).
+ */
+export type CodemodeWasmModule = object;
+
+interface WebAssemblyGlobal {
+	compile(bytes: Uint8Array): Promise<CodemodeWasmModule>;
+}
+
+const modules = new Map<string, Promise<CodemodeWasmModule>>();
+
+/**
+ * Read and compile the QuickJS wasm once per path. `path` defaults to the file in the installed
+ * `quickjs-wasi` package; pass it when that file lives elsewhere, for example embedded in a Bun
+ * compiled executable. A failed load is retried on the next call.
+ */
+export function loadQuickJSWasm(path?: string): Promise<CodemodeWasmModule> {
+	const resolved = path ?? createRequire(import.meta.url).resolve("quickjs-wasi/quickjs.wasm");
+	let module = modules.get(resolved);
+	if (!module) {
+		const { WebAssembly } = globalThis as unknown as { WebAssembly: WebAssemblyGlobal };
+		module = readFile(resolved)
+			.then((bytes) => WebAssembly.compile(bytes))
+			.catch((error: unknown) => {
+				modules.delete(resolved);
+				throw error;
+			});
+		modules.set(resolved, module);
+	}
+	return module;
+}