no-empty-function

Disallow empty functions.

✅

Extending "plugin:@typescript-eslint/recommended" in an ESLint configuration enables this rule.

Examples

This rule extends the base eslint/no-empty-function rule. It adds support for handling TypeScript specific code that would otherwise trigger the rule.

One example of valid TypeScript specific code that would otherwise trigger the no-empty-function rule is the use of parameter properties in constructor functions.

How to Use

.eslintrc.cjs

module.exports = {
  "rules": {
    // Note: you must disable the base rule as it can report incorrect errors
    "no-empty-function": "off",
    "@typescript-eslint/no-empty-function": "error"
  }
};

Options

See eslint/no-empty-function options.

This rule adds the following options:

type AdditionalAllowOptionEntries =
  | 'private-constructors'
  | 'protected-constructors'
  | 'decoratedFunctions'
  | 'overrideMethods';

type AllowOptionEntries =
  | BaseNoEmptyFunctionAllowOptionEntries
  | AdditionalAllowOptionEntries;

interface Options extends BaseNoEmptyFunctionOptions {
  allow?: Array<AllowOptionEntries>;
}
const defaultOptions: Options = {
  ...baseNoEmptyFunctionDefaultOptions,
  allow: [],
};

allow: private-constructors

Examples of correct code for the { "allow": ["private-constructors"] } option:

class Foo {
  private constructor() {}
}

allow: protected-constructors

Examples of correct code for the { "allow": ["protected-constructors"] } option:

class Foo {
  protected constructor() {}
}

allow: decoratedFunctions

Examples of correct code for the { "allow": ["decoratedFunctions"] } option:

@decorator()
function foo() {}

class Foo {
  @decorator()
  foo() {}
}

allow: overrideMethods

Examples of correct code for the { "allow": ["overrideMethods"] } option:

abstract class Base {
  protected greet(): void {
    console.log('Hello!');
  }
}

class Foo extends Base {
  protected override greet(): void {}
}

Resources

• Rule source
• Test source

^{Taken with ❤️ from ESLint core}