cache files (.eslintcache) on save

[scarf005]

previous issues: #1323, #1544

the plugin uses eslint.lintText which does not support caching on onType and onSave. would it be possible to use eslint.lintFiles on onSave instead? using cache could improve performance of eslint on pre-commit hooks (e.g husky and lint-staged) significantly.

i'm interested in opening a PR, however pointers on where to look at would be appreciated.

[dbaeumer]

Actually, shouldn't be too hard. You get the information via the ConfigurationSettings#run and can use it when validating a file here:

vscode-eslint/server/src/eslint.ts

Line 1184 in 553e632

const newOptions: CLIOptions = Object.assign(Object.create(null), settings.options);