Nomad changes

scripts/task/patch-demo-dev.mjs

@@ -0,0 +1,92 @@
+#!/usr/bin/env node
+// Generates docs/demo-dev.html from docs/demo.html with CDN URLs replaced
+// by the local asset server so no manual editing of demo.html is ever needed.
+//
+// CDN pattern replaced:
+//   https://cdn.jsdelivr.net/npm/@kreuzberg/wasm@*/...
+//   → http://localhost:9000/...
+//
+// Also patches pkg/web/kreuzberg_wasm.js (gitignored, wasm-pack generated) to
+// replace bare specifier imports ("env", "wasi_snapshot_preview1") with inline
+// browser shims.  The local 5.x WASM binary is compiled with WASI syscalls via
+// tesseract's C layer; the importmap approach does not propagate into Workers
+// loading cross-origin modules, so we shim the generated JS directly.
+//
+// The output file is gitignored and regenerated on every `task demo:dev`.
+
+import { readFileSync, writeFileSync, existsSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const root = join(dirname(fileURLToPath(import.meta.url)), "..", "..");
+const src = join(root, "docs", "demo.html");
+const dest = join(root, "docs", "demo-dev.html");
+const ASSET_PORT = process.env.ASSET_PORT ?? "9000";
+
+const cdnRe = /https:\/\/cdn\.jsdelivr\.net\/npm\/@kreuzberg\/wasm@[^/'"]+/g;
+
+const patched = readFileSync(src, "utf8")
+	.replace(cdnRe, `http://localhost:${ASSET_PORT}`)
+	.replace(/<title>(.*?)<\/title>/, "<title>$1 [local dev]</title>")
+	.replace(
+		"</body>",
+		`  <div style="position:fixed;bottom:12px;right:12px;background:#1a172a;border:1px solid #58FBDA55;color:#58FBDA;font-family:monospace;font-size:11px;padding:6px 10px;border-radius:6px;z-index:9999">
+    local dev · assets: localhost:${ASSET_PORT}
+  </div>\n</body>`,
+	);
+
+writeFileSync(dest, patched, "utf8");
+console.log(`patch-demo-dev: docs/demo-dev.html → http://localhost:8001/demo-dev.html`);
+console.log(`  assets served from http://localhost:${ASSET_PORT}`);
+
+// Patch pkg/web/kreuzberg_wasm.js — strip bare "env" / "wasi_snapshot_preview1"
+// import lines and replace with inline browser shims so the module loads in a
+// Worker without an importmap (importmap inheritance in Workers is unreliable
+// for bare specifiers in transitive cross-origin dynamic imports).
+const wasmJs = join(root, "crates", "kreuzberg-wasm", "pkg", "web", "kreuzberg_wasm.js");
+if (!existsSync(wasmJs)) {
+	console.warn(`patch-demo-dev: ${wasmJs} not found — skipping WASI shim patch`);
+} else {
+	const bareImportRe = /^import \* as (import\d+) from "(env|wasi_snapshot_preview1)"\s*$/gm;
+	const original = readFileSync(wasmJs, "utf8");
+
+	const envAliases = [];
+	const wasiAliases = [];
+	let m;
+	while ((m = bareImportRe.exec(original)) !== null) {
+		if (m[2] === "env") envAliases.push(m[1]);
+		else wasiAliases.push(m[1]);
+	}
+
+	if (envAliases.length === 0 && wasiAliases.length === 0) {
+		console.log("patch-demo-dev: kreuzberg_wasm.js already patched, skipping");
+	} else {
+		const stripped = original.replace(/^import \* as import\d+ from "(env|wasi_snapshot_preview1)"\s*\n/gm, "");
+
+		const envShim = `const __env_shim = { system: () => -1, mkstemp: () => -1 };`;
+		const envConsts = envAliases.map((a) => `const ${a} = __env_shim;`).join("\n");
+
+		const wasiShim = [
+			`const __wasi_shim = {`,
+			`  environ_sizes_get: () => 0, environ_get: () => 0,`,
+			`  clock_time_get: () => 52,`,
+			`  fd_close: () => 8, fd_fdstat_get: () => 8, fd_fdstat_set_flags: () => 8,`,
+			`  fd_prestat_get: () => 8, fd_prestat_dir_name: () => 8,`,
+			`  fd_read: () => 8, fd_seek: () => 8, fd_write: () => 8,`,
+			`  path_create_directory: () => 52, path_filestat_get: () => 52,`,
+			`  path_open: () => 52, path_remove_directory: () => 52, path_unlink_file: () => 52,`,
+			`  proc_exit: (code) => { throw new Error("WASI: proc_exit(" + code + ")"); },`,
+			`};`,
+		].join("\n");
+		const wasiConsts = wasiAliases.map((a) => `const ${a} = __wasi_shim;`).join("\n");
+
+		const shims = [envShim, envConsts, wasiShim, wasiConsts].filter(Boolean).join("\n") + "\n";
+		const patchedWasmJs = stripped.replace(/^(\/\* @ts-self-types[^\n]*\n)/m, `$1${shims}`);
+
+		writeFileSync(wasmJs, patchedWasmJs, "utf8");
+		console.log(
+			`patch-demo-dev: patched kreuzberg_wasm.js` +
+				` (${envAliases.length} env alias(es), ${wasiAliases.length} wasi alias(es))`,
+		);
+	}
+}