Pre commit hook - the right way

package.json

{
  "name": "app",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "build-prod": "rm -rf dist && ng build --prod --output-hashing none --vendor-chunk true --extract-css false",
    "test": "ng test --single-run",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "pre-commit": "ts-node scripts/precommit.ts"
  },
  "private": true,
  "dependencies": { },
  "devDependencies": {
    "pre-commit": "^1.2.2"
  },
  "pre-commit": [
    "pre-commit"
  ]
}

precommit.ts

import { spawn } from 'child_process';
class PrecommitHook {
    private async stashNotStagedFiles(): Promise<void> {
        return new Promise<void>((resolve) => {
            console.log("***-------------------- stashing not staged files --------------------***");
            let s = spawn('git', ['stash', '-u', '--keep-index'], { stdio: 'inherit' });
            s.on('close', (code) => {
                resolve();
            });
        });

    }

    private tsLint() {
        return new Promise<void>((resolve) => {
            console.log("***-------------------- lint --------------------***");
            let s = spawn('npm', ['run', 'lint'], { stdio: 'inherit' });
            s.on('close', (code) => {
                resolve();
            });
        });
    }

    private gitResetHard() {
        return new Promise<void>((resolve) => {
            console.log("***-------------------- git hard reset --------------------***");
            let s = spawn('git', ['reset', '--hard'], { stdio: 'inherit' });
            s.on('close', (code) => {
                resolve();
            });
        });
    }

    private runTests() {
        return new Promise<void>((resolve) => {
            console.log("***-------------------- test --------------------***");
            let s = spawn('npm', ['run', 'test'], { stdio: 'inherit' });
            s.on('close', (code) => {
                resolve();
            });
        });
    }

    private popNotStagesFiles() {
        return new Promise<void>((resolve) => {
            console.log("***-------------------- pop not staged files --------------------***");
            let s = spawn('git', ['stash', 'pop', '-q'], { stdio: 'inherit' });
            s.on('close', (code) => {
                resolve();
            });
        });
    }

    public async run() {
        try {
            await this.stashNotStagedFiles();
            await this.tsLint();
            await this.runTests();
        }
        finally {
            await this.gitResetHard();
            await this.popNotStagesFiles();
        }
    }
}

const hook = new PrecommitHook();
hook.run();