1. Husky: Git Hooks for Managing Git Workflow
What is Husky?
Husky is a tool used for managing Git hooks in a project. It allows you to easily set up pre-commit, pre-push, or other Git lifecycle hooks to automate tasks such as linting, formatting, and testing before changes are committed or pushed.
Advanced Interview Questions for Husky:
- How does Husky integrate with Git hooks, and what are the most common hooks used in the development process?
- Can you explain how to set up pre-commit hooks with Husky for running ESLint or Prettier?
- How can Husky help enforce code quality during the development lifecycle?
- What are the best practices for using Husky with a CI/CD pipeline?
- How would you configure Husky to automatically run tests before pushing code to a remote repository?
- Can Husky be used to manage Git hooks in a monorepo?
- How can you ensure that Husky does not interfere with development when working on larger teams?
- What are potential pitfalls of using Husky, and how can they be mitigated?
- How would you use Husky in combination with lint-staged for optimized pre-commit checks?
- Can you integrate Husky with ESLint and Prettier in a monorepo setup?
2. .travis.yml: Continuous Integration Configuration File
What is .travis.yml?
.travis.yml
is the configuration file for Travis CI, a continuous integration (CI) service that automates testing, building, and deployment of software. The .travis.yml
file defines the settings, environment variables, scripts, and other configuration options for the build process.
Advanced Interview Questions for .travis.yml:
- How does the
.travis.yml
file fit into a CI/CD pipeline? - What are the key sections of a
.travis.yml
file, and what is their purpose? - How would you configure
.travis.yml
for multi-language projects? - How would you handle matrix builds in
.travis.yml
to test your code against different environments or versions? - Can you explain how to set up environment variables securely within
.travis.yml
? - How can you run unit tests, linting, and build tasks using
.travis.yml
in a Node.js project? - What are the common errors encountered in
.travis.yml
, and how can you debug them? - How would you configure
.travis.yml
to deploy your application to AWS or Heroku after successful tests? - Can you integrate Docker into
.travis.yml
for containerized builds? - How do you handle conditional job execution in
.travis.yml
based on branch or commit messages?
3. ESLint: Code Linting Tool
What is ESLint?
ESLint is a static code analysis tool used to identify and fix problems in JavaScript code. It enforces coding standards, helps in maintaining code quality, and catches potential bugs and anti-patterns.
Advanced Interview Questions for ESLint:
- How does ESLint help enforce consistent code style and prevent bugs in JavaScript or TypeScript code?
- What are the different ESLint configurations you can use, and how do they affect the linting process?
- How can you set up ESLint to automatically fix common issues (like formatting or variable declarations) upon saving a file?
- Explain how ESLint plugins work. Can you give examples of commonly used plugins for React or Vue projects?
- How would you configure ESLint for a monorepo that contains multiple projects?
- Can ESLint be integrated with Prettier for unified code formatting and linting? If yes, how would you configure it?
- How can ESLint be set up in a CI/CD pipeline to prevent code that does not adhere to linting rules from being merged?
- How do you handle ESLint errors that are too verbose or non-actionable in large codebases?
- How would you configure ESLint for a TypeScript project to ensure best practices in typing and static analysis?
- How do you integrate ESLint with Husky to run linting checks automatically before code is committed?
Putting It All Together: A Workflow Example
Here’s a typical advanced developer workflow involving Husky, .travis.yml
, and ESLint:
- Husky is configured to run pre-commit hooks that check for code style issues using ESLint and Prettier.
-
.travis.yml is set up to configure a CI pipeline that:
- Runs tests on each commit.
- Installs dependencies using
npm install
. - Runs linting (
npm run lint
) and tests (npm test
). - Deploys the application to Heroku after successful tests using the
deploy
section of.travis.yml
.
- ESLint enforces coding standards in both JavaScript and TypeScript files, ensuring the code is bug-free and adheres to defined conventions.
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