Git hook to call `git submodule update` automatically via yorkie and Node.js

.gitattributes

# Files excluded from git packages
.githooks/ export-ignore

package.json

{
  "gitHooks": {
    "post-checkout": ".githooks/update-submodule checkout",
    "post-rewrite": ".githooks/update-submodule $GIT_PARAMS"
  },
  "devDependencies": {
    "yorkie": "^2.0.0"
  }
}

update-submodule

#!/usr/bin/env node
const process = require('node:process');
const util = require('node:util');
const exec = util.promisify(require('node:child_process').exec);
const calledBy = process.argv[2] ? '' + process.argv[2] : '';

const getGitChangedFiles = async function () {
    console.log('getting changed files');
    const {stdout, stderr} = await exec('git diff-tree --no-commit-id --name-only HEAD@\\{1\\} HEAD');
    if (stderr) {
        console.error(stderr);
    }
    return '' + stdout;
}

const execGitSubmoduleUpdate = async function () {
    console.log('initializing & updating submodule(s)');
    const {stdout, stderr} = await exec('git submodule update --init --recursive');
    console.log(stdout);
    if (stderr) {
        console.error(stderr);
    }
}

const run = async function () {
    // Call "git submodule update" if the file .gitmodules is changed.
    console.log('[update-submodule hook: ' + calledBy + ']');
    const changedFiles = await getGitChangedFiles();
    if (/(^|\s)\.gitmodules(\s|$)/.test(changedFiles)) {
        await execGitSubmoduleUpdate();
    }
}

run()
    .finally(function () {
        /*
         * In case this script is run by hook post-checkout:
         * This scripts exit status becomes the exit status for `git switch` or `git checkout`.
         *
         * @see: https://git-scm.com/docs/githooks#_post_checkout
         */
        process.exit(0);
    });

This is based on https://gist.github.com/digitaljhelms/f74eaf56835262d6bf3f by @digitaljhelms
Thanks for this!