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Many React projects have ESLint fix up and devs are fixing lint errors as they code. This is great for reducing bugs, and keeping code cleanly formatted.

Nonetheless, sometimes there's a situation where a project can have a lot of linting errors (i.e. adding ESLint to an existing project) and it would be irksome for a dev to gear up them manually. Don't worry, ESLint has a command for automobile-fixing:eslint --fix!

In this article I'll discuss the flags available for 'fix', the types of problems (problem,proffer,layout) that 'fix' can resolve automatically, and options such as how to limit the amount of warnings, print to a file, and more.

ESLint –prepare Options

Whether or not you take experience with ESLint, the primary thing you lot demand to know for using ESLint commands is that it will simply lint and fix according to the rules set in your.eslintrc.json file*. An.eslintrc.json file with lots of preconfigured rules can be establish here at this ESLint playground (curlicue to the bottom for the download).

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Related: Test your TypeScript cognition confronting these 50 difficult TypeScript questions.

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*If you are running 'fix' from the eslint-cli, you can gear up rules with the--rule option.

There are 3 ways that ESLint fix can be run:

• eslint --fix
• eslint --fix-dry-run
• eslint --fix --fix-blazon

eslint --ready will set every rule violation information technology is capable of fixing, actually overwrite the lawmaking, and impress out any warnings or errors it was incapable of fixing.

Most errors are non really automatically fixable. Accept a look at this documentation, the items with the 'wrench' image can be auto-fixed.

Here'due south an interesting case:0 == 0 can be automatically fixed (to0 === 0), but comparing a variable likely won't be fixed (i.e.x == 0). The linter has to err on the side of circumspection. It generally fixes redundancies and situations where typing tin be certain.

The output fromeslint --ready will exist a list of errors and warnings. If desired, warnings can be silenced with the--tranquillity flag. Conversely, if desired, a maximum number of errors tin can exist specified equally 'too many' (--max-warnings [number]), and the linter will succeed simply stop with exit lawmaking 1 (more on that below).

eslint --fix-dry-run acts like prepare but will not actually overwrite the file. Instead, specify an output location and a formatting choice such every biteslint --fix-dry out-run --format=json -o ./test.examination.json. This output will exist quite verbose, naming the files that were linted and results.

eslint --fix --fix-type enables targeting of specific categories of issues to fix. We'll discuss the types in more detail beneath, but an example control would existeslint --set up --fix-blazon layout. This would prepare an event such as having as well much whitespace before a line of code, if the rule is designated in your.eslintrc.json file (this rule in particular would be"indent": ["error", four] to limit whitespace to four characters).

Beneath is output from my project when I raneslint --fix --prepare-blazon problem \"src/**/*.tsx" . This command targeted all problems in my .tsx files under src folder.

Example output…had I specified -gear up-blazon layout, it would have auto fixed the indentation error.

*A note on these commands: notice that--prepare-type is preceded by-fix , while--set-dry out-run is not.

The Iii Types of Fixable Issues

The three types of issue either fixed or reported by--gear up are:

• problem
• proposition
• layout

Co-ordinate to the ESLint documentation:

• a problem is code that will crusade an error or confusion
• a suggestion is code that could be done in a better style
• layout deals with how the code looks

Now that we are familiar with thefix-type flag, let'southward look again at the0 == 0 issue. This is fixable as asuggestion. Bug such as whitespace count earlier the start of a code statement or extra parenthesis are fixable aslayout.

ESLint –fix Warnings

When runningeslint --fix, some dominion violations result in warnings instead of errors. Accept a look at the below TypeScript rule violations:

warning IObservableArray is defined but never used @typescript-eslint/no-unused-varswarning Unexpected any. Specify a unlike blazon @typescript-eslint/no-explicit-whatever

Generally, warnings don't directly effect in bug at runtime. Notwithstanding, many rules tin be configured to show errors instead of warnings (or vice versa). For example, both of the issues listed above are included as warnings when extending@typescript-eslint/recommended like below in.eslintrc.json:

extends: [   'plugin:@typescript-eslint/recommended' ]

However, I could have specified the below instead:

rules: [
          "no-unused-vars": "error"
]

This would make theIObservableArray violation announced as an error instead of a alarm. Error vs alert is partly a difference in what rules a particular squad finds most disquisitional to enforce.

The Three Exit Codes of ESLint fix Command

ESLint'due south fix control has iii possible exit codes:

• 0: success and no lint errors, less warnings than max warnings
• 1: linting was successful, at to the lowest degree one lint fault or more warnings than max-warnings
• 2: linting unsuccessful due to config error or internal error

The exit code will exist at the end of the output and appear like this:

It'south best to fix the errors of grade. Even so, continue in listen there is also the pick (preferably only during testing) to ignore rules for individual lines. For case,// eslint-disable-next-line @typescript-eslint/no-explicit-any could exist used to bypass theno-explicit-whatever warning mentioned previously.

TSLint –fix Differences

Even though TSLint is deprecated in favor of ESLint, many devs are nevertheless using TSLint (based on how many Google searches are still happening for TSLint topics).

TSLint has a--fix selection, simply it has no flags (i.e. no--dry out-run option). TSLint besides has different get out codes. From Palantir's docs:

0: Linting succeeded without errors (warnings may accept occurred)

ane: An invalid command line statement or combination thereof was used

ii: Linting failed with one or more than rule violations with severityerror

If you are still using TSLint, consider upgrading totypescript-eslint. Many of the commands and directives are the aforementioned, such as the directives for ignoring lines or rules.

Resources

Here's how and when to specify global variables in your .eslintrc file.

Aggrandize your JavaScript knowledge with these l difficult JavaScript questions!

Normally I link to example React lawmaking and prove screenshots of a working app. This article is different: the codebase doesn't matter much, it'southward all about the ESLint commands and the output. In addition to the lawmaking snippets and screenshots higher up, have a look at the below docs. They provide very detailed information about all the capabilities of ESLint prepare.

• ESLint docs: https://eslint.org/docs/user-guide/command-line-interface#fixing-problems
• Old TSLint 'set' command: https://palantir.github.io/tslint/usage/cli/
• This is a skilful beginning to your.eslintrc.json file:

parser: '@typescript-eslint/parser', extends: [   'eslint:recommended',   'plugin:react/recommended',   'plugin:@typescript-eslint/recommended' ], plugins: [   'react-hooks' ]

• This is an splendid resources: https://eslint.org/demo. You lot can gyre to the bottom and download the.eslintrc.json used for the rules in the demo. You likely will want to incorporate some of these rules in your own project.

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Source: https://smartdevpreneur.com/using-eslint-fix-in-your-project/

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