How To Repair My Husky Impact Wrench Model H4430 On Youtube
Enforcing Coding Conventions with Husky Pre-commit Hooks
ToolingLast updated
Mar 10th, 2020
In this guide, we'll learn how to setup Husky to prevent bad git commits and enforce lawmaking standards in your projection.
This mail service is a office of the Clean Code Tooling serial.
You may want to read the previous posts.
1. How to apply ESLint with TypeScript
2. How to utilize Prettier with ESLint and TypeScript in VSCode
Intro
On about projects I've ever worked collaboratively on, someone takes the part of the code cleanliness champion. It'southward usually the squad lead, and oft times, their role involves reviewing PRs and making sure love and care is put into the quality of the code.
Quality includes both the chosen coding conventions in add-on to the formatting of the code.
Today, it's expert practise in JavaScript projects to utilise ESLint to define the projection's coding conventions. For case, how does your team feel about using for loops? What nearly semicolons- are those required? Etc.
Those are conventions.
The other piece of the puzzle is formatting. That's the visual appearance of the code. When at that place's more than than one developer working on a projection, ensuring that code looks consistent is something to be addressed.
Prettier is the right tool for this.
In the previous article, we learned how to combine both ESLint and Prettier, but we didn't larn how to actually enforce the conventions and formatting on a existent life projection with multiple developers.
In this article, we'll learn how to utilise Husky to do so on a Git-based project.
Husky
Husky is an npm package that "makes Git hooks easy".
When you initialize Git (the version control tool that yous're probably familar with) on a projection, information technology automatically comes with a feature called hooks.
If you lot go to the root of a projection intialized with Git and type:
You'll see a listing of sample hooks like pre-push, pre-rebase, pre-commit, and so on. This is a mode for u.s.a. to write plugin lawmaking to execute some logic before nosotros perform the activity.
If we wanted to ensure before someone creates a commit using the git commit command, that their code was properly linted and formatted, nosotros could write a pre-commit Git hook.
Writing that manually probably wouldn't be fun. It would also be a challenge to distribute and ensure that hooks were installed on other developers' machines.
These are some of the challenges that Husky aims to address.
With Husky, nosotros can ensure that for a new programmer working in our codebase (using at least Node version 10):
- Hooks get created locally
- Hooks are run when the Git control is called
- Policy that defines how someone can contribute to a project is enforced.
Allow'south become information technology set upward.
Installing Husky
To install Croaking, run:
npm install husky --salvage-dev Configuring Husky
To configure Croaking, in the root of our project's package.json, add the following husky key:
packet.json
"husky" : { "hooks" : { "pre-commit" : "" , // Command goes here "pre-push" : "" , // Command goes here "..." : "..." } } When we execute the git commit or git push command, the respective hook will run the script we supply in our package.json.
Example workflow
Post-obit forth from the previous manufactures, if we've configured ESLint and Prettier, I suggest to utilize ii scripts:
-
prettier-format: Format as much lawmaking every bit possible. -
lint: Ensure that the coding conventions are beingness adhered to. Throw an fault if important conventions are broken.
package.json
{ "scripts" : { "prettier-format" : "prettier --config .prettierrc 'src/**/*.ts' --write" , "lint" : "eslint . --ext .ts" , ... } , "husky" : { "hooks" : { "pre-commit" : "npm run prettier-format && npm run lint" } } } Include these scripts in the scripts object in your bundle.json. Then, at the very least, run prettier-format and and then lint equally a pre-commit hook.
This will ensure that you cannot consummate a commit without formatted code that passes the conventions.
No-loops instance
I like to use the no-loops package as an example. This convention doesn't let developers to utilise for loops, and instead suggests that we use Array utility functions like forEach, map, and the like.
Adding the plugin and its rule to the .eslintrc:
.eslintrc
{ "root" : truthful , "parser" : "@typescript-eslint/parser" , "plugins" : [ "@typescript-eslint" , "no-loops" , "prettier" ] , "extends" : [ "eslint:recommended" , "plugin:@typescript-eslint/eslint-recommended" , "plugin:@typescript-eslint/recommended" , "prettier" ] , "rules" : { "no-loops/no-loops" : 2 , // two means throw an ERROR "no-console" : i , "prettier/prettier" : 2 } } Then placing a for loop in the source code...
src/index.ts
console . log ( 'Hello earth!' ) ; for ( permit i = 0 ; i < 12 ; i++ ) { console . log (i) ; } And attempting to commit, it should exit with a non-zero exit code, which as we know, means an error occurred.
simple-typescript-starter git:(prettier) ✗ git commit -one thousand "Exam commit" husky > pre-commit (node v10.ten.0) > typescript-starter@1.0.0 prettier-format simple-typescript-starter > prettier --config .prettierrc 'src/**/*.ts' --write src/index.ts 191ms > typescript-starter@1.0.0 lint /simple-typescript-starter > eslint . --ext .ts /simple-typescript-starter/src/alphabetize.ts ane:1 alarm Unexpected console statement no-console 3:1 error loops are non immune no-loops/no-loops 4:iii warning Unexpected panel statement no-console ✖ iii issues ( 1 mistake, two warnings) And at that place it is!
Other considerations
If you notice that linting is taking a long fourth dimension, check out this package, lint-staged. It runs the linter, but only confronting files that are staged (files that y'all're fix to button). This was suggested to me by @glambertmtl. Thank you!
Discussion
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Source: https://khalilstemmler.com/blogs/tooling/enforcing-husky-precommit-hooks/
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