Building Google App Script (GAS) with rslib

rslib-gas.ts

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

// how to use this in rslib.config.ts:
// - `import { gasLib } from './rslib-gas.ts'
// - add a `lib` entry like: `lib: [gasLib('doPut')]`
// - put appsscript.json under public/; it's copied to dist/ as is
//
// how it works:
// - build & bundle .ts into dist/Code.js
// - export global names via `global`; see the first/last lines in Code.js

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),
    },
  }
}

export function gasConfig(names: string[]): RslibConfig {
  return {
    lib: [gasLib(names)],
    output: {
      // appsscript.json
      copy: [{ from: 'public' }],
    },
  }
}