Building GAS script with rslib

rslib.config.ts

import { LibConfig, defineConfig } from '@rslib/core'

export default defineConfig({
  lib: [gasLib(['doGet'])],
  source: {
    entry: {
      index: './src/index.ts',
    },
  },
  output: {
    copy: [{ from: 'public' }],
  },
})

// rslib config for GAS
//
// - bundle & build a single dist/Code.js
// - copy public/appsscript.json to dist/appsscript.json
//
// XXX make this a plugin

const UMD_NAME = 'GAS_APP'

function listNames(names: string[]): string {
  return names
    .map(
      (name) =>
        `function ${name}(...args) { return global["${UMD_NAME}"].${name}(...args); }`
    )
    .join('\n')
}

export function gasLib(names: string[]): LibConfig {
  return {
    format: 'umd',
    umdName: UMD_NAME,
    syntax: 'es2020',
    bundle: true,
    output: {
      filename: {
        js: 'Code.js',
      },
    },
    banner: {
      js: 'var global = this;',
    },
    footer: {
      js: listNames(names),
    },
  }
}