rollup-plugin-tla

A rollup plugin to add top level await support for iife/umd

plugin will use identifier to wrap all Top Level AwaitExpression/ForOfStatement in transform hook

then unwrap them in renderChunk hook

then change iife/umd module wrap function to async function

await xxx -> __T$L$A__(xxx) -> await xxx

for await(const a of b){} -> __T$L$A__FOR((async()=>{for await(const a of b){}})()) -> for await(const a of b){}

the original code of this plugin project comes from vite-plugin-monkey

Installation

pnpm add rollup-plugin-tla
# yarn add rollup-plugin-tla
# npm install rollup-plugin-tla

Usage

export type TlaOptions = {
  /**
   * plugin will use `identifier` to wrap all Top Level `AwaitExpression`/`ForOfStatement` in [transform](https://rollupjs.org/plugin-development/#transform) hook
   *
   * then unwrap them in [renderChunk](https://rollupjs.org/plugin-development/#renderchunk) hook
   *
   * then change iife/umd module wrap function to async function
   *
   * `await xxx` -> `__T$L$A__(xxx)` -> `await xxx`
   *
   * `for await(const a of b){}` -> `__T$L$A__FOR((async()=>{for await(const a of b){}})())` -> `for await(const a of b){}`
   *
   * ---
   *
   * **BUT** if you already use `__T$L$A__(xxx)` in your code, it will be replaced to `await xxx`
   *
   * So make sure this identifier is `unique` and `unused`
   *
   * @default '__T$L$A__'
   */
  identifier?: string;
};

// rollup.config.ts
import typescript from '@rollup/plugin-typescript';
import { defineConfig } from 'rollup';
import tla from 'rollup-plugin-tla';

export default defineConfig({
  input: './src/index.ts',
  output: {
    format: 'iife',
    dir: './dist',
    name: `__Expose`,
    sourcemap: true,
  },
  plugins: [typescript(), tla()],
});

example config code -> /playground/test-tla/rollup.config.ts

example dist code -> playground/test-tla/dist/index.js