Ignore Lines and Files In ESLint

ESLint analyzes your code to find issues based on pre-defined rules. However, sometimes you need to break an ESLint rule. ESLint supports 2 mechanisms for ignoring rule violations in code:

• Using comments, which let you disable certain rules for a line or code block.
• Using the .eslintignore file.

Disabling ESLint With a Comment

ESLint lets you disable individual lint rules using /* eslint */ comments. For example, many ESLint rules disallow using JavaScript's eval() function, because eval() has several security concerns. However, if you're really certain you want to allow eval(), you can disable the lint rule as follows:

const res = eval('42'); // eslint-disable-line no-eval

The // eslint-disable-line comment disables the no-eval rule for just that line.

You can also disable the no-eval rule for an entire function block by using /* eslint-disable */.

function usesEval() {
  /* eslint-disable no-eval */
  const res = eval('42');
  const res2 = eval('test');

  return res2 + res;
}

If you put /* eslint-disable no-eval */ before any code in a .js file, that will disable the no-eval rule for the entire file.

You can also disable all ESLint rules by putting /* eslint-disable */ at the top of a file.

Using .eslintignore

You can use comments to disable all ESLint rules for a file, but doing so is often discouraged. If you're certain you want to make ESLint ignore a file, it is typically better to list it out in a .eslintignore file in your project's root directory.

.eslintignore syntax is similar to that of .gitignore. To ignore a file myfile.js, all you need to do is add the following line to .eslintignore:

myfile.js

ESLint supports globbing files. To ignore all files that end in .test.js, you can add this line to .eslintignore:

*.test.js

ESLint considers paths in .eslintignore relative to the location of the .eslintignore file. Below is how you ignore all files in your project's data directory.

data/*

More Eslint Tutorials

• Using ESLint's --fix Flag
• Intro to ESLint Config Files
• Understanding ESLint Rules
• Disable ESLint for a Single Line