#method-signature-style

#Configuration

import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/method-signature-style': 'error',
    },
  },
]);

#Rule Details

Enforces using a particular method signature syntax in interfaces and type literals.

There are two styles for declaring method signatures in TypeScript:

• Method shorthand: func(arg: string): number;
• Property: func: (arg: string) => number;

The key difference: with strictFunctionTypes enabled, method parameters are checked less strictly, while function property parameters are checked more strictly. This makes function properties more type-safe.

#Options

• "property" (default): Enforces function property signature syntax.
• "method": Enforces method shorthand signature syntax.

#"property" (default)

Examples of incorrect code:

interface T1 {
  func(arg: string): number;
}

Examples of correct code:

interface T1 {
  func: (arg: string) => number;
}

#"method"

Examples of incorrect code:

interface T1 {
  func: (arg: string) => number;
}

Examples of correct code:

interface T1 {
  func(arg: string): number;
}

#Original Documentation

https://typescript-eslint.io/rules/method-signature-style