feat(web): generate split wasm debug secondary modules

tools/web/split-wbv2-wasm.mjs

@@ -0,0 +1,56 @@
+import crypto from "node:crypto";
+import fs from "node:fs";
+import path from "node:path";
+import { spawnSync } from "node:child_process";
+
+const root = path.resolve(import.meta.dirname, "../..");
+const arg = (name, fallback = null) => {
+  const index = process.argv.indexOf(name);
+  return index >= 0 ? process.argv[index + 1] : fallback;
+};
+const wasmSplit = path.join(root, ".emsdk/upstream/bin/wasm-split");
+const input = arg("--input", "web/app/public/vendor/blender/web_engine.wasm");
+const outputDir = arg("--output-dir", "web/app/public/vendor/blender/modules");
+const manifestPath = arg("--manifest", "web/app/public/wasm-module-manifest.json");
+const splitFunctions = arg("--split-funcs", "web_engine_get_live_handles");
+if (!fs.existsSync(path.join(root, input))) throw new Error(`WASM input is missing: ${input}`);
+if (!fs.existsSync(wasmSplit)) throw new Error(`wasm-split is missing: ${wasmSplit}`);
+const destination = path.join(root, outputDir);
+fs.mkdirSync(destination, { recursive: true });
+const stem = path.basename(input, ".wasm");
+const primary = path.join(destination, `${stem}.primary.wasm`);
+const secondary = path.join(destination, `${stem}.secondary.wasm`);
+const result = spawnSync(wasmSplit, [
+  "--split", "--all-features", "--split-funcs", splitFunctions,
+  "--primary-output", primary,
+  "--secondary-output", secondary,
+  path.join(root, input),
+], { cwd: root, encoding: "utf8" });
+if (result.status !== 0 || !fs.existsSync(primary) || !fs.existsSync(secondary)) {
+  throw new Error(`wasm-split failed (${result.status}):\n${result.stdout ?? ""}${result.stderr ?? ""}`);
+}
+const digest = (file) => crypto.createHash("sha256").update(fs.readFileSync(file)).digest("hex");
+const variant = input.includes("/pthread/") ? "pthread" : "single";
+if (fs.existsSync(path.join(root, manifestPath))) {
+  const manifestFile = path.join(root, manifestPath);
+  const manifest = JSON.parse(fs.readFileSync(manifestFile, "utf8"));
+  const debug = manifest.modules?.find((entry) => entry.id === "debug-incremental");
+  const secondaryEntry = manifest.modules?.find((entry) => entry.id === "debug-incremental-secondary");
+  if (debug?.resources?.[variant]) {
+    debug.resources[variant].sha256 = digest(path.join(root, input));
+    debug.resources[variant].url = `/${input.replace(/^web\/app\/public\//u, "")}`;
+  }
+  if (secondaryEntry?.resources?.[variant]) {
+    secondaryEntry.resources[variant].fileName = path.basename(secondary);
+    secondaryEntry.resources[variant].url = `/${path.relative(path.join(root, "web/app/public"), secondary).replaceAll(path.sep, "/")}`;
+    secondaryEntry.resources[variant].sha256 = digest(secondary);
+  }
+  fs.writeFileSync(manifestFile, `${JSON.stringify(manifest, null, 2)}\n`);
+}
+console.log(JSON.stringify({
+  status: "PASS",
+  input,
+  splitFunctions: splitFunctions.split(",").filter(Boolean),
+  primary: { path: path.relative(root, primary), bytes: fs.statSync(primary).size, sha256: digest(primary) },
+  secondary: { path: path.relative(root, secondary), bytes: fs.statSync(secondary).size, sha256: digest(secondary) },
+}, null, 2));