Different eslint rules based on file extension

Question

Is it possible to have different rules applied to files based on their files extension? For example I have [test].spec.js test spec files residing along my source code, but I like to add rules that only apply to them only.

Answer 1

This was added. Docs here

example from the docs

{   "rules": {     "quotes": [ 2, "double" ]   },    "overrides": [     {       "files": [ "bin/*.js", "lib/*.js" ],       "excludedFiles": "*.test.js",       "rules": {         "quotes": [ 2, "single" ]       }     }   ] } 

Effecitively you can supply globs and a set of rules that override the default rules for files that match each glob.

Answer 2

Currently it's not possible, unless you create multiple configuration files and run eslint with correct globs for each file type separately. However, there's an open PR here: https://github.com/eslint/eslint/pull/8081 to add this functionality.