feat: queueMicrotask polyfill

Author: ncpa0cpl

src/config/config-schema.ts

@@ -80,6 +80,7 @@ export const ConfigSchema = DataType.RecordOf({
  base64: OptionalField(DataType.Boolean),
  fetch: OptionalField(DataType.Boolean),
  WebSocket: OptionalField(DataType.Boolean),
+ queueMicrotask: OptionalField(DataType.Boolean),
  node: OptionalField(
  DataType.RecordOf({
  path: OptionalField(DataType.Boolean),

src/polyfills/queue-microtask.ts

@@ -0,0 +1,28 @@
+import { registerPolyfills } from "./shared/polyfill-global";
+
+registerPolyfills("queueMicrotask")(() => {
+ let onNextMicrotask: Array<() => void> | undefined;
+
+ function queueMicrotask(task: () => void) {
+ if (onNextMicrotask) {
+ onNextMicrotask.push(task);
+ }
+
+ onNextMicrotask = [task];
+
+ imports.mainloop.idle_add(() => {
+ if (!onNextMicrotask) return;
+ const tasks = onNextMicrotask;
+ onNextMicrotask = undefined;
+ for (const task of tasks!) {
+ try {
+ task();
+ } catch (e) {
+ console.error(e);
+ }
+ }
+ }, -2000);
+ }
+
+ return { queueMicrotask };
+});

src/utils/get-polyfills.ts

@@ -57,6 +57,10 @@ export const getGlobalPolyfills = (program: Program): Promise<Polyfills> => {
  polyFilepaths.push("./polyfills/esm/websocket.mjs");
  }
 
+ if (polyfills?.queueMicrotask) {
+ polyFilepaths.push("./polyfills/esm/queue-microtask.mjs");
+ }
+
  const customPolyfills: string[] = [];
 
  if (program.config.customPolyfills) {

src/utils/parse-env-var-config.ts

@@ -102,15 +102,12 @@ export const parseEnvVarConfig = (program: Program) => {
  }
 
  // Add env file vars
- const cwdFiles = fs.readdirSync(program.cwd);
  const envFileName = envVars?.envFilePath ?? ".env";
  const failIfNoEnvFile = envVars?.envFilePath !== undefined;
 
- if (cwdFiles.includes(envFileName)) {
- const envFileData = fs.readFileSync(
- path.resolve(program.cwd, envFileName),
- "utf-8",
- );
+ const envFilepath = path.resolve(program.cwd, envFileName);
+ if (fs.existsSync(envFilepath)) {
+ const envFileData = fs.readFileSync(envFilepath, "utf-8");
 
  for (const envVarEntry of parseDotEnv(envFileData)) {
  if (vars.some(([k]) => k === envVarEntry[0])) {