Amplify CLI command hook helper to auto-commit changes

ambient.d.ts

type HookData = {
  amplify: {
    environment: {
      envName: string
      projectPath: string
      defaultEditor: string
    }
    command: string
    subCommand: string
    argv: string[]
  }
}

type HookError = {
  message: string
  stack: string
}

type HookEvent = {
  data: HookData
  error: HookError
}

type HookStage = 'pre' | 'post'

type HookContext = {
  url: string
}

auto-git.js

import * as fs from 'node:fs'
import * as path from 'node:path'
import { exec } from 'node:child_process'

function run(command) {
  return new Promise((resolve, reject) => {
    const child = exec(command, (error, stdout, stderr) => {
      if (error) {
        reject(new Error(error, { cause: stdout }))
      } else {
        resolve({ stdout, stderr })
      }
    })
    child.stdout.pipe(process.stdout)
    child.stderr.pipe(process.stderr)
  })
}

/**
 * Get the lifecycle stage from the filename
 * @returns {HookStage}
 */
function getLifecycleStage(lifecycleEventFileURL = import.meta.url) {
  const url = new URL(lifecycleEventFileURL)
  const filename = path.basename(url.pathname, '.js')
  const [stage] = filename.split('-')
  return stage
}

/**
 * @returns {HookData}
 */
function getParameters() {
  return JSON.parse(fs.readFileSync(0, { encoding: 'utf8' }))
}

/**
 * @param {HookEvent} event
 * @param {HookContext} context
 */
async function handler(event, context) {
  const { data, error } = event
  if (error) {
    console.error(error)
    process.exit(1)
  }
  const { command, environment } = data.amplify
  const stage = getLifecycleStage(context.url)
  const message = `${stage} ${command} ${environment.envName}`
  try {
    await run(`git add .; git commit -m "${message}"`)
  } catch (error) {
    if (error.cause.includes('nothing to commit')) {
      console.log('[autogit] Skipping, nothing to commit')
    } else {
      console.error(error)
      process.exit(1)
    }
  }
}

export function autogit(lifecycleEventFileURL) {
  const event = getParameters()
  handler(event, { url: lifecycleEventFileURL })
}

jsconfig.json

{
  "include": ["./*.js", "./ambient.d.ts"]
}

package.json

{
  "type": "module"
}

post-add.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

post-checkout.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

post-init.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

post-publish.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

post-pull.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

post-push.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

post-remove.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

pre-checkout.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

pre-publish.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

pre-push.js

import { autogit } from './auto-git.js'
autogit(import.meta.url)

gh gist clone git@gist.github.com:cd031d1f4b1eb375b937de0dc958fe9a.git amplify/hooks

here is my fish script for "mkrep"

function mkrep
    set repro ~/Documents/projects/aws-amplify/reproductions/$argv[1]
    mkdir $repro
    cd $repro
    code $repro
    # setup new amplify project
    amplify init -y
    # pull in the auto-git hooks
    rm -rf amplify/hooks
    gh gist clone git@gist.github.com:cd031d1f4b1eb375b937de0dc958fe9a.git amplify/hooks
    # set up git
    git init
end