Pre-commit hook for Linting JS with ESLint before commit.

pre-commit-eslint

#!/bin/sh

STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep ".jsx\{0,1\}$")
ESLINT="$(git rev-parse --show-toplevel)/node_modules/.bin/eslint"

if [[ "$STAGED_FILES" = "" ]]; then
  exit 0
fi

PASS=true

printf "\nValidating Javascript:\n"

# Check for eslint
if [[ ! -x "$ESLINT" ]]; then
  printf "\t\033[41mPlease install ESlint\033[0m (npm i --save-dev eslint)"
  exit 1
fi

for FILE in $STAGED_FILES
do
  "$ESLINT" "$FILE"

  if [[ "$?" == 0 ]]; then
    printf "\t\033[32mESLint Passed: $FILE\033[0m"
  else
    printf "\t\033[41mESLint Failed: $FILE\033[0m"
    PASS=false
  fi
done

printf "\nJavascript validation completed!\n"

if ! $PASS; then
  printf "\033[41mCOMMIT FAILED:\033[0m Your commit contains files that should pass ESLint but do not. Please fix the ESLint errors and try again.\n"
  exit 1
else
  printf "\033[42mCOMMIT SUCCEEDED\033[0m\n"
fi

exit $?

+1 @ri7nz solution even though I'm just on Zsh.

One more tip: instead of saving this to .git/hooks/pre-commit save it to scripts/pre-commit (or somewhere in your repo). Then run ln -s $PWD/scripts/pre-commit .git/hooks/ and add a note about this to your README.md or CONTRIBUTORS.md file. This way anyone who clones the repo will have the hook as well.

@rashtay any idea why I am facing this issue?

This is occurring on source tree.

Validating Javascript:
env: node: No such file or directory

thank you @rashtay, thank you all for this!

Nice one, I have added a \n to https://gist.github.com/rashtay/328da46a99a9d7c746636df1cf769675#file-pre-commit-eslint-L25 and https://gist.github.com/rashtay/328da46a99a9d7c746636df1cf769675#file-pre-commit-eslint-L27 for better readability on the prompt.

@adnanaliarshad Need more details

@agilles28 Most welcome :)

@streichsbaer Awesome

if you are use Tmux+Zsh & have an error with message

.git/hooks/pre-commit: 7: .git/hooks/pre-commit: [[: not found

Validating Javascript:
.git/hooks/pre-commit: 16: .git/hooks/pre-commit: [[: not found

this my solution, cange line 1 on pre-commit-eslint from

#!/bin/sh

To

#!/bin/bash

i tested on my ubuntu with Tmux+Zsh

thanks

Hi
I tried it but every time it result succeed whereas ng lint in angular project having eslint issue then why it all time result succeed.
please help me. I am facing this since days.

It fails on error, but not on warnings. What to change in this script so that it fails on warnings too?

It fails on error, but not on warnings. What to change in this script so that it fails on warnings too?

You should configure your .eslintrc to treat rules you consider important as errors. You can also change the command to "$ESLINT" "$FILE" --max-warnings 0 instead.

Hello Everyone,

I created this a long time ago and I no more write such manual scripts. I rely on husky for everything. So pardon me for my delayed response or if I am unable to help. I see there are a lot of helpful comments. I thank each and everyone for making this better. Cheers.

Hello Everyone,

I created this a long time ago and I no more write manual scripts. I rely on husky for everything. So pardon me for my delayed response or if I am unable to help. I see there are a lot of helpful comments. I thank each and everyone for making this better. Cheers.

Could you update this then? I think that's why you're still getting so much traffic here.
https://levelup.gitconnected.com/how-to-run-eslint-using-pre-commit-hook-25984fbce17e

Edit: nevermind :D lol big notice right at the top, I skimmed past it - my bad.

Could you update this then? I think that's why you're still getting so much traffic here.
https://levelup.gitconnected.com/how-to-run-eslint-using-pre-commit-hook-25984fbce17e

Edit: nevermind :D lol big notice right at the top, I skimmed past it - my bad.

Edited the notice to clearly indicate I am not maintaining this gist anymore. Thank you for the suggestion @julix-unity ;)