Gas Build

An ESBuild plugin and simplified CLI for bundling of Google App Script projects from a modern TypeScript / JavaScript codebase.

Installation

npm install -D gas-build esbuild

This installs both the plugin and the CLI. Note that esbuild is declared as a peer dependency and must be installed separately.

Usage

CLI

This is a preferred method for simple projects with a single entry point.

To build your project, call the gas-build command with the entry point file and the output file:

gas-build src/index.ts --outfile dist/bundle.js

Note that you might have to wrap the command in a package.json script so that the gas-build is properly recognized:

{
  "scripts": {
    "build": "gas-build src/index.ts --outfile dist/bundle.js"
  }
}

Watch mode

The CLI also supports simple watch mode. Enable it by passing the --watch flag:

gas-build src/index.ts --outfile dist/bundle.js --watch

Plugin

When the CLI is not sufficient, you can use the plugin directly in your build script. Define a custom build script, using the esbuild API, and include the gasBuildPlugin.

// filename: build.mjs
import { build } from 'esbuild'
import { gasBuildPlugin } from 'gas-build'

await build({
  entryPoints: ['src/index.ts'],
  bundle: true,
  // make sure there is a single output file
  // for the pluging to process
  outfile: 'dist/bundle.js',
  platform: 'node',
  target: 'es2020',
  format: 'esm',
  plugins: [gasBuildPlugin()],
})

Run the build script using node:

node build.mjs