typedef.test.ts

import rule from '../../src/rules/typedef';
import { RuleTester, getFixturesRootDir } from '../RuleTester';

const rootDir = getFixturesRootDir();
const ruleTester = new RuleTester({
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 2015,
    tsconfigRootDir: rootDir,
    project: './tsconfig.json',
  },
});

ruleTester.run('typedef', rule, {
  valid: [
    // Array destructuring
    {
      code: `const [a]: [number] = [1]`,
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    {
      code: `const [a, b]: [number, number] = [1, 2]`,
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    {
      code: `const [a] = 1;`,
      options: [
        {
          arrayDestructuring: false,
        },
      ],
    },
    {
      code: `for (const [key, val] of new Map([['key', 1]])) {}`,
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    {
      code: `for (const [[key]] of [[['key']]]) {}`,
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    {
      code: `for (const [[{ key }]] of [[[{ key: 'value' }]]]) {}`,
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    `let a: number;
    [a] = [1];`,
    // Arrow parameters
    `((a: number): void => {})()`,
    `((a: string, b: string): void => {})()`,
    {
      code: `((a: number): void => { })()`,
      options: [
        {
          arrowParameter: false,
        },
      ],
    },
    {
      code: `((a: string, b: string): void => { })()`,
      options: [
        {
          arrowParameter: false,
        },
      ],
    },
    // Member variable declarations
    `class Test {
      state: number;
    }`,
    `class Test {
      state: number = 1;
    }`,
    {
      code: `class Test {
        state = 1;
      }`,
      options: [
        {
          memberVariableDeclaration: false,
        },
      ],
    },
    // Object destructuring
    {
      code: `const { a }: { a: number } = { a: 1 }`,
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    {
      code: `const { a, b }: { [i: string]: number } = { a: 1, b: 2 }`,
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    {
      code: `for (const {p1: {p2: { p3 }}} of [{p1: {p2: {p3: 'value'}}}]) {}`,
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    {
      code: `for (const {p1: {p2: { p3: [key] }}} of [{p1: {p2: {p3: ['value']}}}]) {}`,
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    {
      code: `const { a } = { a: 1 };`,
      options: [
        {
          objectDestructuring: false,
        },
      ],
    },
    {
      code: `for (const { key, val } of [{ key: 'key', val: 1 }]) {}`,
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    // Function parameters
    `function receivesNumber(a: number): void { }`,
    `function receivesStrings(a: string, b: string): void { }`,
    `function receivesNumber([a]: [number]): void { }`,
    `function receivesNumbers([a, b]: number[]): void { }`,
    `function receivesString({ a }: { a: string }): void { }`,
    `function receivesStrings({ a, b }: { [i: string ]: string }): void { }`,
    `function receivesNumber(a: number = 123): void { }`,
    // Constructor parameters
    `class Test {
      constructor() {}
    }`,
    `class Test {
      constructor(param: string) {}
    }`,
    `class Test {
      constructor(param: string = 'something') {}
    }`,
    `class Test {
      constructor(private param: string = 'something') {}
    }`,
    // Method parameters
    `class Test {
      public method(x: number): number { return x; }
    }`,
    `class Test {
      public method(x: number = 123): number { return x; }
    }`,
    // Property declarations
    `type Test = {
       member: number;
     };`,
    `type Test = {
       [i: string]: number;
     };`,
    `interface Test {
      member: string;
     };`,
    `interface Test {
      [i: number]: string;
     };`,
    {
      code: `type Test = {
        member;
      };`,
      options: [
        {
          propertyDeclaration: false,
        },
      ],
    },
    {
      code: `type Test = {
        [i: string];
      };`,
      options: [
        {
          propertyDeclaration: false,
        },
      ],
    },
    // Variable declarations
    {
      code: `const x: string = "";`,
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `let x: string = "";`,
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `let x: string;`,
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `const a = 1;`,
      options: [
        {
          variableDeclaration: false,
        },
      ],
    },
    {
      code: `let a;`,
      options: [
        {
          variableDeclaration: false,
        },
      ],
    },
    {
      code: `let a = 1;`,
      options: [
        {
          variableDeclaration: false,
        },
      ],
    },
    {
      code: `const [a, b] = [1, 2];`,
      options: [
        {
          objectDestructuring: false,
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `const { a, b } = { a: '', b: '' };`,
      options: [
        {
          objectDestructuring: false,
          variableDeclaration: true,
        },
      ],
    },
    // Contexts where TypeScript doesn't allow annotations
    {
      code: `for (x of [1, 2, 3]) { }`,
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `for (const x in {}) { }`,
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `try { } catch (e) { }`,
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
  ],
  invalid: [
    // Array destructuring
    {
      code: `const [a] = [1]`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    {
      code: `const [a, b] = [1, 2]`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
      options: [
        {
          arrayDestructuring: true,
        },
      ],
    },
    // Object destructuring
    {
      code: `const { a } = { a: 1 }`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    {
      code: `const { a, b } = { a: 1, b: 2 }`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
      options: [
        {
          objectDestructuring: true,
        },
      ],
    },
    // Arrow parameters
    {
      code: `const receivesNumber = (a): void => { }`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `const receivesStrings = (a, b): void => { }`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
        {
          data: { name: 'b' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    // Member variable declarations
    {
      code: `class Test {
        state = 1;
      }`,
      errors: [
        {
          data: { name: 'state' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `class Test {
        ["state"] = 1;
      }`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
    },
    // Function parameters
    {
      code: `function receivesNumber(a): void { }`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `function receivesStrings(a, b): void { }`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
        {
          data: { name: 'b' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `function receivesNumber([a]): void { }`,
      errors: [
        {
          column: 25,
          messageId: 'expectedTypedef',
        },
      ],
    },
    {
      code: `function receivesNumbers([a, b]): void { }`,
      errors: [
        {
          column: 26,
          messageId: 'expectedTypedef',
        },
      ],
    },
    {
      code: `function receivesString({ a }): void { }`,
      errors: [
        {
          column: 25,
          messageId: 'expectedTypedef',
        },
      ],
    },
    {
      code: `function receivesStrings({ a, b }): void { }`,
      errors: [
        {
          column: 26,
          messageId: 'expectedTypedef',
        },
      ],
    },
    // Constructor parameters
    {
      code: `class Test {
        constructor(param) {}
      }`,
      errors: [
        {
          column: 21,
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `class Test {
        constructor(param = 'something') {}
      }`,
      errors: [
        {
          column: 21,
          messageId: 'expectedTypedef',
        },
      ],
    },
    {
      code: `class Test {
        constructor(private param = 'something') {}
      }`,
      errors: [
        {
          column: 21,
          messageId: 'expectedTypedef',
        },
      ],
    },
    // Method parameters
    {
      code: `class Test {
        public method(x): number { return x; }
      }`,
      errors: [
        {
          column: 23,
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `class Test {
        public method(x = 123): number { return x; }
      }`,
      errors: [
        {
          column: 23,
          messageId: 'expectedTypedef',
        },
      ],
    },
    {
      code: `class Test {
        public constructor(public x) { }
      }`,
      errors: [
        {
          column: 28,
          messageId: 'expectedTypedef',
        },
      ],
    },
    // Property declarations
    {
      code: `type Test = {
        member;
      };`,
      errors: [
        {
          data: { name: 'member' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `type Test = {
        [i: string];
      };`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
    },
    {
      code: `interface Test {
        member;
      };`,
      errors: [
        {
          data: { name: 'member' },
          messageId: 'expectedTypedefNamed',
        },
      ],
    },
    {
      code: `interface Test {
        [i: string];
      };`,
      errors: [
        {
          messageId: 'expectedTypedef',
        },
      ],
    },
    // Variable declarations
    {
      code: `const a = 1;`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
      ],
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `const a = 1, b: number = 2, c = 3;`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
        {
          data: { name: 'c' },
          messageId: 'expectedTypedefNamed',
        },
      ],
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `let a;`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
      ],
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `let a = 1;`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
      ],
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
    {
      code: `let a = 1, b: number, c = 2;`,
      errors: [
        {
          data: { name: 'a' },
          messageId: 'expectedTypedefNamed',
        },
        {
          data: { name: 'c' },
          messageId: 'expectedTypedefNamed',
        },
      ],
      options: [
        {
          variableDeclaration: true,
        },
      ],
    },
  ],
});