no-type-alias.test.ts

import rule from '../../src/rules/no-type-alias';
import { RuleTester } from '../RuleTester';

const ruleTester = new RuleTester({
  parser: '@typescript-eslint/parser',
});

ruleTester.run('no-type-alias', rule, {
  valid: [
    {
      code: 'type Foo = string | [number, number];',
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: 'type Foo = string & [number, number];',
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: 'type Foo = string & [number, number] | [number, number, number];',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: "type A = 'a' & ('b' | 'c');",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a';",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: "type Foo = 'a' & 'b' & 'c';",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a' & 'b' & 'c';",
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: "type Foo = 'a' & 'b' & 'c';",
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: "type Foo = 'a' | 'b' & 'c';",
      options: [{ allowAliases: 'always' }],
    },
    {
      code: "type Foo = 'a' | 'b' & 'c';",
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = 1;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = 1 | 2;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = 1 | 2;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = 1 | 2;',
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: 'type Foo = 1 | 2 | 3;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = 1 | 2 | 3;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = 1 | 2 | 3;',
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: 'type Foo = 1 & 2;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = 1 & 2;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = 1 & 2;',
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: 'type Foo = 1 & 2 & 3;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = 1 & 2 & 3;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = 1 & 2 & 3;',
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: 'type Foo = 1 | 2 & 3;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = 1 | 2 & 3;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = true;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = true | false;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = true | false;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = true | false;',
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: 'type Foo = true & false;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = true & false;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = true & false;',
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: `
interface Bar {}
type Foo = Bar | string;
            `,
      options: [{ allowAliases: 'always' }],
    },
    {
      code: `
interface Bar {}
type Foo = Bar | string;
            `,
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: `
interface Bar {}
type Foo = Bar | string;
            `,
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & string;
            `,
      options: [{ allowAliases: 'always' }],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & string;
            `,
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & string;
            `,
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: 'type Foo = string;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = string | string[];',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = string | string[];',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = string | string[];',
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: 'type Foo = string | string[] | number;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = string | string[] | number;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = string | string[] | number;',
      options: [{ allowAliases: 'in-unions' }],
    },
    {
      code: 'type Foo = string & string[];',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = string & string[];',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = string & string[];',
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: 'type Foo = string & string[] & number;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = string & string[] & number;',
      options: [{ allowAliases: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = string & string[] & number;',
      options: [{ allowAliases: 'in-intersections' }],
    },
    {
      code: 'type Foo = () => void;',
      options: [{ allowCallbacks: 'always' }],
    },
    {
      code: 'type Foo = () => void | string;',
      options: [{ allowCallbacks: 'always' }],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowLiterals: 'always' }],
    },
    {
      code: 'type Foo = {} | {};',
      options: [{ allowLiterals: 'always' }],
    },
    {
      code: 'type Foo = {} | {};',
      options: [{ allowLiterals: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = {} | {};',
      options: [{ allowLiterals: 'in-unions' }],
    },
    {
      code: 'type Foo = {} & {};',
      options: [{ allowLiterals: 'always' }],
    },
    {
      code: 'type Foo = {} & {};',
      options: [{ allowLiterals: 'in-unions-and-intersections' }],
    },
    {
      code: 'type Foo = {} & {};',
      options: [{ allowLiterals: 'in-intersections' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'always' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} | {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'always' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} | {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-unions-and-intersections' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} | {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-unions' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} & {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'always' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} & {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-unions-and-intersections' }],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} & {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-intersections' }],
    },
    {
      code: `export type ClassValue = string | number | ClassDictionary | ClassArray | undefined | null | false;`,
      options: [
        {
          allowAliases: 'in-unions-and-intersections',
          allowCallbacks: 'always',
          allowLiterals: 'in-unions-and-intersections',
          allowMappedTypes: 'in-unions-and-intersections',
        },
      ],
    },
    {
      code: 'type Foo = typeof bar;',
      options: [{ allowAliases: 'always' }],
    },
    {
      code: 'type Foo = typeof bar | typeof baz;',
      options: [{ allowAliases: 'in-unions' }],
    },
  ],
  invalid: [
    {
      code: "type Foo = 'a'",
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'aliases',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: "type Foo = 'a'",
      options: [{ allowAliases: 'never' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'aliases',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b';",
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [{ allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [{ allowAliases: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [{ allowAliases: 'never', allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b';",
      options: [
        {
          allowAliases: 'in-intersections',
          allowLiterals: 'in-unions',
        },
      ],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowAliases: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowAliases: 'never', allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [{ allowAliases: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' | 'b' | 'c';",
      options: [
        {
          allowAliases: 'in-intersections',
          allowLiterals: 'in-unions',
        },
      ],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b';",
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowLiterals: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowAliases: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowAliases: 'never', allowLiterals: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [{ allowAliases: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b';",
      options: [
        {
          allowAliases: 'in-unions',
          allowLiterals: 'in-intersections',
        },
      ],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b' & 'c';",
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b' & 'c';",
      options: [{ allowLiterals: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 24,
        },
      ],
    },
    {
      code: "type Foo = 'a' & 'b' & 'c';",
      options: [{ allowAliases: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 18,
        },
        {
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          },
          line: 3,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 3,
          column: 18,
        },
      ],
    },
    {
      code: `
interface Bar {}
type Foo = Bar | {};
            `,
      options: [{ allowAliases: 'in-unions-and-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 3,
          column: 18,
        },
      ],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & {};
            `,
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 3,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
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          },
          line: 3,
          column: 18,
        },
      ],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & {};
            `,
      options: [{ allowAliases: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 3,
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        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
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          },
          line: 3,
          column: 18,
        },
      ],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & {};
            `,
      options: [{ allowAliases: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
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        {
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          data: {
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        },
      ],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & {};
            `,
      options: [{ allowAliases: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 3,
          column: 18,
        },
      ],
    },
    {
      code: `
interface Bar {}
type Foo = Bar & {};
            `,
      options: [{ allowAliases: 'in-unions-and-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 3,
          column: 18,
        },
      ],
    },
    {
      code: 'type Foo = () => void;',
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'callbacks',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = () => void;',
      options: [{ allowCallbacks: 'never' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'callbacks',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowLiterals: 'never' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowLiterals: 'in-intersections' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowLiterals: 'in-unions-and-intersections' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowAliases: 'in-intersections' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [{ allowLiterals: 'never', allowAliases: 'in-intersections' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [
        {
          allowLiterals: 'in-unions',
          allowAliases: 'in-intersections',
        },
      ],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [
        {
          allowLiterals: 'in-intersections',
          allowAliases: 'in-intersections',
        },
      ],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {};',
      options: [
        {
          allowLiterals: 'in-unions-and-intersections',
          allowAliases: 'in-intersections',
        },
      ],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'literals',
          },
          line: 1,
          column: 12,
        },
      ],
    },
    {
      code: 'type Foo = {} | {};',
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 1,
          column: 17,
        },
      ],
    },
    {
      code: 'type Foo = {} | {};',
      options: [{ allowLiterals: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
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          },
          line: 1,
          column: 17,
        },
      ],
    },
    {
      code: 'type Foo = {} | {};',
      options: [{ allowLiterals: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'union',
          },
          line: 1,
          column: 17,
        },
      ],
    },
    {
      code: 'type Foo = {} & {};',
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 17,
        },
      ],
    },
    {
      code: 'type Foo = {} & {};',
      options: [{ allowLiterals: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 17,
        },
      ],
    },
    {
      code: 'type Foo = {} & {};',
      options: [{ allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 17,
        },
      ],
    },
    {
      code: "type Foo = string & {} | 'a' | 1;",
      options: [{ allowAliases: 'in-unions', allowLiterals: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'intersection',
          },
          line: 1,
          column: 12,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 21,
        },
      ],
    },
    {
      code: "type Foo = string & {} | 'a' | 1;",
      options: [
        {
          allowAliases: 'in-intersections',
          allowLiterals: 'in-unions',
        },
      ],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Literals',
            compositionType: 'intersection',
          },
          line: 1,
          column: 21,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 26,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Aliases',
            compositionType: 'union',
          },
          line: 1,
          column: 32,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
};
            `,
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'mapped types',
          },
          line: 2,
          column: 15,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'never' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'mapped types',
          },
          line: 2,
          column: 15,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-unions' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'mapped types',
          },
          line: 2,
          column: 15,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-intersections' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'mapped types',
          },
          line: 2,
          column: 15,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-unions-and-intersections' }],
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'mapped types',
          },
          line: 2,
          column: 15,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} | {
    readonly [P in keyof T] : T[P]
};
            `,
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'union',
          },
          line: 2,
          column: 15,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'union',
          },
          line: 4,
          column: 5,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} | {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'union',
          },
          line: 2,
          column: 15,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'union',
          },
          line: 4,
          column: 5,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} | {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-intersections' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'union',
          },
          line: 2,
          column: 15,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'union',
          },
          line: 4,
          column: 5,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} & {
    readonly [P in keyof T] : T[P]
};
            `,
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'intersection',
          },
          line: 2,
          column: 15,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'intersection',
          },
          line: 4,
          column: 5,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} & {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'never' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'intersection',
          },
          line: 2,
          column: 15,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'intersection',
          },
          line: 4,
          column: 5,
        },
      ],
    },
    {
      code: `
type Foo<T> = {
    readonly [P in keyof T] : T[P]
} & {
    readonly [P in keyof T] : T[P]
};
            `,
      options: [{ allowMappedTypes: 'in-unions' }],
      errors: [
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'intersection',
          },
          line: 2,
          column: 15,
        },
        {
          messageId: 'noCompositionAlias',
          data: {
            typeName: 'Mapped types',
            compositionType: 'intersection',
          },
          line: 4,
          column: 5,
        },
      ],
    },
    {
      // https://github.com/typescript-eslint/typescript-eslint/issues/270
      code: `export type ButtonProps = JSX.IntrinsicElements['button'];`,
      errors: [
        {
          messageId: 'noTypeAlias',
          data: {
            alias: 'aliases',
          },
          line: 1,
          column: 27,
        },
      ],
    },
  ],
});