close
Rslint

    no-use-before-define

    Configuration

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

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/no-use-before-define': 'error',
    },
  },
]);

    Rule Details

    Disallow the use of variables before they are defined.

    This rule extends the base ESLint no-use-before-define rule to add support for TypeScript-specific constructs like type, interface, and enum declarations.

    Examples of incorrect code for this rule:

    alert(a);
var a = 10;

f();
function f() {}

new A();
class A {}

const foo = Foo.FOO;
enum Foo { FOO }

    Examples of correct code for this rule:

    var a = 10;
alert(a);

type Foo = string;
const x: Foo = "hello";

function f() {}
f();

    Options

    • functions (boolean, default true) - Whether to check function declarations
    • classes (boolean, default true) - Whether to check class declarations
    • variables (boolean, default true) - Whether to check variable declarations
    • enums (boolean, default true) - Whether to check enum declarations
    • typedefs (boolean, default true) - Whether to check type/interface declarations
    • ignoreTypeReferences (boolean, default true) - Whether to ignore references in type annotations
    • allowNamedExports (boolean, default false) - Whether to allow references in named exports

    Also accepts "nofunc" as a shorthand for { functions: false }.

    Original Documentation