default.js

import path from 'path';
import { test, testVersion, SYNTAX_CASES, getTSParsers } from '../utils';
import { RuleTester } from 'eslint';

import { CASE_SENSITIVE_FS } from 'eslint-module-utils/resolve';

const ruleTester = new RuleTester();
const rule = require('rules/default');

ruleTester.run('default', rule, {
  valid: [].concat(
    test({ code: 'import "./malformed.js"' }),

    test({ code: 'import foo from "./empty-folder";' }),
    test({ code: 'import { foo } from "./default-export";' }),
    test({ code: 'import foo from "./default-export";' }),
    test({ code: 'import foo from "./mixed-exports";' }),
    test({
      code: 'import bar from "./default-export";' }),
    test({
      code: 'import CoolClass from "./default-class";' }),
    test({
      code: 'import bar, { baz } from "./default-export";' }),

    // core modules always have a default
    test({ code: 'import crypto from "crypto";' }),

    test({ code: 'import common from "./common";' }),

    // es7 export syntax
    test({ code: 'export bar from "./bar"',
      parser: require.resolve('babel-eslint') }),
    test({ code: 'export { default as bar } from "./bar"' }),
    test({ code: 'export bar, { foo } from "./bar"',
      parser: require.resolve('babel-eslint') }),
    test({ code: 'export { default as bar, foo } from "./bar"' }),
    test({ code: 'export bar, * as names from "./bar"',
      parser: require.resolve('babel-eslint') }),

    // sanity check
    test({ code: 'export {a} from "./named-exports"' }),
    test({
      code: 'import twofer from "./trampoline"',
      parser: require.resolve('babel-eslint'),
    }),

    // jsx
    test({
      code: 'import MyCoolComponent from "./jsx/MyCoolComponent.jsx"',
      parserOptions: {
        sourceType: 'module',
        ecmaVersion: 6,
        ecmaFeatures: { jsx: true },
      },
    }),

    // #54: import of named export default
    test({ code: 'import foo from "./named-default-export"' }),

    // #94: redux export of execution result,
    test({ code: 'import connectedApp from "./redux"' }),
    test({
      code: 'import App from "./jsx/App"',
      parserOptions: {
        ecmaFeatures: { jsx: true, modules: true },
      },
    }),

    // from no-errors
    test({
      code: "import Foo from './jsx/FooES7.js';",
      parser: require.resolve('babel-eslint'),
    }),

    // #545: more ES7 cases
    test({
      code: "import bar from './default-export-from.js';",
      parser: require.resolve('babel-eslint'),
    }),
    test({
      code: "import bar from './default-export-from-named.js';",
      parser: require.resolve('babel-eslint'),
    }),
    test({
      code: "import bar from './default-export-from-ignored.js';",
      settings: { 'import/ignore': ['common'] },
      parser: require.resolve('babel-eslint'),
    }),
    test({
      code: "export bar from './default-export-from-ignored.js';",
      settings: { 'import/ignore': ['common'] },
      parser: require.resolve('babel-eslint'),
    }),

    // es2022: Arbitrary module namespace identifier names
    testVersion('>= 8.7', () => ({
      code: 'export { "default" as bar } from "./bar"',
      parserOptions: {
        ecmaVersion: 2022,
      },
    })),

    ...SYNTAX_CASES,
  ),

  invalid: [
    test({
      code: "import Foo from './jsx/FooES7.js';",
      errors: ["Parse errors in imported module './jsx/FooES7.js': Unexpected token = (6:16)"],
    }),

    test({
      code: 'import baz from "./named-exports";',
      errors: [{ message: 'No default export found in imported module "./named-exports".',
        type: 'ImportDefaultSpecifier' }] }),

    // es7 export syntax
    test({
      code: 'export baz from "./named-exports"',
      parser: require.resolve('babel-eslint'),
      errors: ['No default export found in imported module "./named-exports".'],
    }),
    test({
      code: 'export baz, { bar } from "./named-exports"',
      parser: require.resolve('babel-eslint'),
      errors: ['No default export found in imported module "./named-exports".'],
    }),
    test({
      code: 'export baz, * as names from "./named-exports"',
      parser: require.resolve('babel-eslint'),
      errors: ['No default export found in imported module "./named-exports".'],
    }),
    // exports default from a module with no default
    test({
      code: 'import twofer from "./broken-trampoline"',
      parser: require.resolve('babel-eslint'),
      errors: ['No default export found in imported module "./broken-trampoline".'],
    }),

    // #328: * exports do not include default
    test({
      code: 'import barDefault from "./re-export"',
      errors: ['No default export found in imported module "./re-export".'],
    }),
  ],
});

// #311: import of mismatched case
if (!CASE_SENSITIVE_FS) {
  ruleTester.run('default (path case-insensitivity)', rule, {
    valid: [
      test({
        code: 'import foo from "./jsx/MyUncoolComponent.jsx"',
      }),
    ],
    invalid: [
      test({
        code: 'import bar from "./Named-Exports"',
        errors: ['No default export found in imported module "./Named-Exports".'],
      }),
    ],
  });
}

context('TypeScript', function () {
  getTSParsers().forEach((parser) => {
    ruleTester.run(`default`, rule, {
      valid: [
        test({
          code: `import foobar from "./typescript-default"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
        }),
        test({
          code: `import foobar from "./typescript-export-assign-default"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
        }),
        test({
          code: `import foobar from "./typescript-export-assign-function"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
        }),
        test({
          code: `import foobar from "./typescript-export-assign-mixed"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
        }),
        test({
          code: `import foobar from "./typescript-export-assign-default-reexport"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
        }),
        test({
          code: `import React from "./typescript-export-assign-default-namespace"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          parserOptions: {
            tsconfigRootDir: path.resolve(__dirname, '../../files/typescript-export-assign-default-namespace/'),
          },
        }),
        test({
          code: `import Foo from "./typescript-export-as-default-namespace"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          parserOptions: {
            tsconfigRootDir: path.resolve(__dirname, '../../files/typescript-export-as-default-namespace/'),
          },
        }),
        test({
          code: `import Foo from "./typescript-export-react-test-renderer"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          parserOptions: {
            tsconfigRootDir: path.resolve(__dirname, '../../files/typescript-export-react-test-renderer/'),
          },
        }),
        test({
          code: `import Foo from "./typescript-extended-config"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          parserOptions: {
            tsconfigRootDir: path.resolve(__dirname, '../../files/typescript-extended-config/'),
          },
        }),
        test({
          code: `import foobar from "./typescript-export-assign-property"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
        }),
      ],

      invalid: [
        test({
          code: `import foobar from "./typescript"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          errors: ['No default export found in imported module "./typescript".'],
        }),
        test({
          code: `import React from "./typescript-export-assign-default-namespace"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          errors: ['No default export found in imported module "./typescript-export-assign-default-namespace".'],
        }),
        test({
          code: `import FooBar from "./typescript-export-as-default-namespace"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          errors: ['No default export found in imported module "./typescript-export-as-default-namespace".'],
        }),
        test({
          code: `import Foo from "./typescript-export-as-default-namespace"`,
          parser,
          settings: {
            'import/parsers': { [parser]: ['.ts'] },
            'import/resolver': { 'eslint-import-resolver-typescript': true },
          },
          parserOptions: {
            tsconfigRootDir: path.resolve(__dirname, '../../files/typescript-no-compiler-options/'),
          },
          errors: [
            {
              message: 'No default export found in imported module "./typescript-export-as-default-namespace".',
              line: 1,
              column: 8,
              endLine: 1,
              endColumn: 11,
            },
          ],
        }),
      ],
    });
  });
});