extensions.js

import { RuleTester } from 'eslint'
import rule from 'rules/extensions';
import { test } from '../utils';

const ruleTester = new RuleTester()

ruleTester.run('extensions', rule, {
  valid: [
    test({ code: 'import a from "a"' }),
    test({ code: 'import dot from "./file.with.dot"' }),
    test({
      code: 'import a from "a/index.js"',
      options: [ 'always' ]
    }),
    test({
      code: 'import dot from "./file.with.dot.js"',
      options: [ 'always' ]
    }),
    test({
      code: [
        'import a from "a"',
        'import packageConfig from "./package.json"',
      ].join('\n'),
      options: [ { json: 'always', js: 'never' } ]
    }),
    test({
      code: [
        'import lib from "./bar"',
        'import component from "./bar.jsx"',
        'import data from "./bar.json"'
      ].join('\n'),
      options: [ 'never' ],
      settings: { 'import/resolve': { 'extensions': [ '.js', '.jsx', '.json' ] } }
    })
  ],

  invalid: [
    test({
      code: 'import a from "a/index.js"',
      errors: [ {
        message: 'Unexpected use of file extension "js" for "a/index.js"',
        line: 1,
        column: 15
      } ]
    }),
    test({
      code: 'import a from "a"',
      options: [ 'always' ],
      errors: [ {
        message: 'Missing file extension "js" for "a"',
        line: 1,
        column: 15
      } ]
    }),
    test({
      code: 'import dot from "./file.with.dot"',
      options: [ "always" ],
      errors: [
        {
          message: 'Missing file extension "js" for "./file.with.dot"',
          line: 1,
          column: 17
        }
      ]
    }),
    test({
      code: [
        'import a from "a/index.js"',
        'import packageConfig from "./package"',
      ].join('\n'),
      options: [ { json: 'always', js: 'never' } ],
      settings: { 'import/resolve': { 'extensions': [ '.js', '.json' ] } },
      errors: [
        {
          message: 'Unexpected use of file extension "js" for "a/index.js"',
          line: 1,
          column: 15
        },
        {
          message: 'Missing file extension "json" for "./package"',
          line: 2,
          column: 27
        }
      ]
    }),
    test({
      code: [
        'import lib from "./bar.js"',
        'import component from "./bar.jsx"',
        'import data from "./bar.json"'
      ].join('\n'),
      options: [ 'never' ],
      settings: { 'import/resolve': { 'extensions': [ '.js', '.jsx', '.json' ] } },
      errors: [
        {
            message: 'Unexpected use of file extension "js" for "./bar.js"',
            line: 1,
            column: 17
        }
      ]
    }),
    test({
      code: [
        'import lib from "./bar.js"',
        'import component from "./bar.jsx"',
        'import data from "./bar.json"'
      ].join('\n'),
      options: [ { json: 'always', js: 'never', jsx: 'never' } ],
      settings: { 'import/resolve': { 'extensions': [ '.js', '.jsx', '.json' ] } },
      errors: [
        {
            message: 'Unexpected use of file extension "js" for "./bar.js"',
            line: 1,
            column: 17
        }
      ]
    })

  ]
})