JavaScript

Environment

Qualified supports Node 18, 14, 12, 10, 8 and 6.

Node versions older than 12 are deprecated. Use Node 18, except for Puppeteer and React Native challenges (use Node 12) and Vue challenges (use Node 14).

Timeout

The sandbox environment will timeout the code within 12 seconds.

Node Packages

The following packages have been installed:

Node 18

Default (no preset)

• @babel/core: 7.20.5
• @babel/preset-env: 7.20.2
• @babel/register: 7.18.9
• @babel/runtime: 7.20.6
• @codewars/jest-reporter: 1.0.3
• @codewars/mocha-reporter: 1.0.0
• @codewars/test-compat: 1.1.0
• @faker-js/faker: 7.6.0
• axios: 1.2.1
• babel-jest: 29.3.1
• bcrypt: 5.1.0
• bignumber.js: 9.1.1
• body-parser: 1.20.1
• canvas: 2.10.2
• chai: 4.3.7
• chai-http: 4.3.0
• cheerio: 1.0.0-rc.12
• cookie-parser: 1.4.6
• cors: 2.8.5
• dotenv: 16.0.3
• escape-html: 1.0.3
• esm: 3.2.25
• espower-loader: 1.2.2
• express: 4.18.2
• fast-check: 3.4.0
• jest: 29.3.1
• jsdom: 20.0.3
• knex: 2.3.0
• lodash: 4.17.21
• mocha: 10.2.0
• mongodb: 4.12.1
• mongoose: 6.8.0
• nanoid: 4.0.0
• node-fetch: 3.3.0
• objection: 3.0.1
• pg: 8.8.0
• pg-hstore: 2.3.4
• pino: 8.8.0
• pino-http: 8.3.0
• power-assert: 1.6.1
• query-string: 8.0.3
• ramda: 0.28.0
• redis: 4.5.1
• sequelize: 6.27.0
• sinon: 15.0.1
• sinon-chai: 3.7.0
• socket.io: 4.5.4
• socket.io-client: 4.5.4
• sqlite3: 5.1.4
• supertest: 6.3.3

React (react preset)

Only available in Project Code Challenges.

• @babel/core: 7.20.5
• @babel/plugin-proposal-class-properties: 7.18.6
• @babel/preset-env: 7.20.2
• @babel/preset-react: 7.18.6
• @babel/runtime: 7.20.6
• @codewars/jest-reporter: 1.0.3
• @testing-library/dom: 8.19.0
• @testing-library/jest-dom: 5.16.5
• @testing-library/react: 13.4.0
• @testing-library/user-event: 14.4.3
• axios: 1.2.1
• babel-jest: 29.3.1
• classnames: 2.3.2
• cross-fetch: 3.1.5
• escape-html: 1.0.3
• immer: 9.0.16
• jest: 29.3.1
• jest-environment-jsdom: 29.3.1
• jest-fetch-mock: 3.0.3
• jest-snapshot: 29.3.1
• marked: 4.2.4
• mobx: 6.7.0
• mobx-react: 7.6.0
• nanoid: 4.0.0
• prop-types: 15.8.1
• react: 18.2.0
• react-cookie: 4.1.1
• react-dom: 18.2.0
• react-is: 18.2.0
• react-redux: 8.0.5
• react-router-dom: 6.4.5
• react-test-renderer: 18.2.0
• redux: 4.2.0
• reselect: 4.1.7
• sinon: 15.0.1
• styled-components: 5.3.6
• use-immer: 0.8.1

Node 14

Default (no preset)

• @babel/core: 7.16.5
• @babel/preset-env: 7.16.5
• @babel/register: 7.16.5
• @babel/runtime: 7.16.5
• @codewars/jest-reporter: 1.0.3
• @codewars/mocha-reporter: 1.0.0
• @codewars/test-compat: 1.1.0
• axios: 0.24.0
• babel-jest: 27.4.5
• bcrypt: 5.0.1
• bignumber.js: 9.0.2
• body-parser: 1.19.1
• chai: 4.3.4
• chai-http: 4.3.0
• cheerio: 1.0.0-rc.10
• cookie-parser: 1.4.6
• cors: ^2.8.5
• dotenv: ^10.0.0
• escape-html: 1.0.3
• esm: 3.2.25
• espower-loader: 1.2.2
• express: 4.17.2
• faker: 5.5.3
• fast-check: 2.20.0
• jest: 27.4.5
• jsdom: 19.0.0
• knex: 0.95.14
• lodash: 4.17.21
• mocha: 9.1.3
• mongodb: 4.2.2
• mongoose: 6.1.3
• nanoid: ^3.1.30
• node-fetch: ^3.1.0
• objection: 3.0.0
• pg: 8.7.1
• pg-hstore: 2.3.4
• pino: ^7.6.0
• pino-http: ^6.5.0
• power-assert: 1.6.1
• query-string: 7.0.1
• ramda: 0.27.1
• redis: 4.0.1
• sequelize: 6.12.1
• sinon: 12.0.1
• sinon-chai: 3.7.0
• socket.io: 4.4.0
• socket.io-client: 4.4.0
• sqlite3: 5.0.2
• supertest: ^6.1.6

React (react preset)

Only available in Project Code Challenges.

• @babel/core: 7.16.5
• @babel/plugin-proposal-class-properties: 7.16.5
• @babel/preset-env: 7.16.5
• @babel/preset-react: 7.16.5
• @babel/runtime: 7.16.5
• @codewars/jest-reporter: ^1.0.3
• @testing-library/dom: 8.11.1
• @testing-library/jest-dom: ^5.16.1
• @testing-library/react: 12.1.2
• @testing-library/react-hooks: 7.0.2
• @testing-library/user-event: 13.5.0
• axios: 0.24.0
• babel-jest: 27.4.5
• classnames: 2.3.1
• cross-fetch: 3.1.4
• escape-html: 1.0.3
• immer: 9.0.7
• jest: 27.4.5
• jest-environment-jsdom: 27.4.4
• jest-fetch-mock: 3.0.3
• jest-snapshot: 27.4.5
• marked: 4.0.8
• mobx: 6.3.9
• mobx-react: 7.2.1
• nanoid: ^3.1.30
• prop-types: 15.7.2
• react: 17.0.2
• react-cookie: 4.1.1
• react-dom: 17.0.2
• react-is: ^17.0.2
• react-redux: 7.2.6
• react-router-dom: 6.2.1
• react-test-renderer: 17.0.2
• redux: 4.1.2
• reselect: 4.1.5
• sinon: 12.0.1
• styled-components: 5.3.3
• use-immer: 0.6.0

Vue (vue preset)

Only available in Project Code Challenges.

• @babel/core: 7.16.5
• @babel/plugin-transform-runtime: 7.16.5
• @babel/preset-env: 7.16.5
• @babel/runtime: 7.16.5
• @codewars/jest-reporter: ^1.0.3
• @testing-library/dom: 8.11.1
• @testing-library/jest-dom: ^5.16.1
• @testing-library/vue: 6.4.2
• @vue/compiler-sfc: ^3.2.26
• @vue/vue3-jest: ^27.0.0-alpha.4
• axios: 0.24.0
• babel-core: ^7.0.0-bridge.0
• babel-jest: 27.4.5
• babel-plugin-dynamic-import-node: 2.3.3
• cross-fetch: 3.1.4
• jest: 27.4.5
• jest-fetch-mock: 3.0.3
• jest-serializer-vue: 2.0.2
• jest-transform-stub: 2.0.0
• sinon: 12.0.1
• vue: 3.2.26
• vuex: 4.0.2

Node 12

Default (no preset)

• @babel/core: 7.10.5
• @babel/preset-env: 7.10.4
• @babel/register: 7.10.5
• @babel/runtime: 7.10.5
• @codewars/test-compat: 1.1.0
• axios: 0.19.2
• babel-jest: 26.1.0
• bcrypt: 5.0.0
• bignumber.js: 9.0.0
• body-parser: 1.19.0
• chai: 4.3.4
• chai-http: 4.3.0
• cheerio: 1.0.0-rc.3
• cookie-parser: 1.4.5
• cors: ^2.8.5
• dotenv: ^8.2.0
• escape-html: 1.0.3
• esm: 3.2.25
• espower-loader: 1.2.2
• express: 4.17.1
• faker: 4.1.0
• fast-check: 1.26.0
• jest: 26.1.0
• jsdom: 16.3.0
• knex: 0.21.6
• lodash: 4.17.19
• mocha: 8.3.0
• mongodb: 3.5.9
• mongoose: 5.9.24
• nanoid: ^3.1.20
• node-fetch: ^2.6.1
• objection: 2.2.1
• pg: 8.3.0
• pg-hstore: 2.3.3
• pino: ^6.11.0
• pino-http: ^5.3.0
• power-assert: 1.6.1
• query-string: 6.13.1
• ramda: 0.27.0
• redis: 3.0.2
• sequelize: 6.3.3
• sinon: 9.0.2
• sinon-chai: 3.5.0
• socket.io: 2.3.0
• socket.io-client: 2.3.0
• sqlite3: 5.0.0
• supertest: ^4.0.2

React (react preset)

Only available in Project Code Challenges.

• @babel/core: 7.10.5
• @babel/plugin-proposal-class-properties: 7.10.4
• @babel/preset-env: 7.10.4
• @babel/preset-react: 7.10.4
• @babel/runtime: 7.10.5
• @testing-library/dom: 7.21.0
• @testing-library/jest-dom: ^5.11.1
• @testing-library/react: 10.4.7
• @testing-library/react-hooks: 3.3.0
• @testing-library/user-event: 12.0.11
• axios: 0.19.2
• babel-jest: 26.1.0
• classnames: 2.2.6
• cross-fetch: 3.0.5
• enzyme: 3.11.0
• enzyme-adapter-react-16: 1.15.2
• enzyme-to-json: 3.5.0
• escape-html: 1.0.3
• immer: 7.0.5
• jest: 26.1.0
• jest-environment-jsdom: 26.1.0
• jest-fetch-mock: 3.0.3
• jest-snapshot: 26.1.0
• marked: 1.1.1
• mobx: 5.15.4
• mobx-react: 6.2.2
• prop-types: 15.7.2
• react: 16.13.1
• react-cookie: 4.0.3
• react-dom: 16.13.1
• react-is: ^16.13.1
• react-redux: 7.2.0
• react-router-dom: 5.2.0
• react-test-renderer: 16.13.1
• rebass: 4.0.7
• recompose: 0.30.0
• redux: 4.0.5
• reselect: 4.0.0
• sinon: 9.0.2
• styled-components: 5.1.1
• styled-system: 5.1.5
• use-immer: 0.4.0

React Native (react-native preset)

Only available in Project Code Challenges.

• @babel/core: ^7.13.15
• @codewars/jest-reporter: ^1.0.3
• @testing-library/jest-native: ^4.0.1
• @testing-library/react-native: ^7.2.0
• babel-jest: ^26.6.3
• jest: ^26.6.3
• metro-react-native-babel-preset: ^0.65.2
• react: ^17.0.2
• react-dom: ^17.0.2
• react-native: ^0.64.0
• react-native-web: ^0.15.6
• react-test-renderer: ^17.0.2

Vue (vue preset)

Only available in Project Code Challenges.

• @babel/core: 7.10.5
• @babel/plugin-transform-runtime: 7.10.5
• @babel/preset-env: 7.10.4
• @babel/runtime: 7.10.5
• @testing-library/dom: 7.21.0
• @testing-library/jest-dom: ^5.11.1
• @testing-library/vue: 5.0.4
• @vue/test-utils: 1.0.3
• axios: 0.19.2
• babel-core: ^7.0.0-bridge.0
• babel-jest: 26.1.0
• babel-plugin-dynamic-import-node: 2.3.3
• cross-fetch: 3.0.5
• jest: 26.1.0
• jest-fetch-mock: 3.0.3
• jest-serializer-vue: 2.0.2
• jest-transform-stub: 2.0.0
• sinon: 9.0.2
• vue: 2.6.11
• vue-jest: ^3.0.6
• vue-template-compiler: 2.6.11
• vuex: 3.5.1

Node 10

Since Node 10, we have multiple presets for different kinds of challenges.

Default (no preset)

• @babel/core: ^7.2.2
• @babel/preset-env: ^7.3.1
• @babel/register: ^7.0.0
• @babel/runtime: ^7.3.1
• axios: ^0.18.0
• babel-jest: ^24.7.1
• bcrypt: ^3.0.7
• bignumber.js: ^8.0.1
• body-parser: ^1.19.0
• chai: ^4.2.0
• chai-http: ^4.2.1
• cheerio: ^1.0.0-rc.2
• cookie-parser: ^1.4.4
• escape-html: ^1.0.3
• esm: ^3.1.3
• espower-loader: ^1.2.2
• express: ^4.16.4
• faker: ^4.1.0
• fast-check: ^1.8.1
• jest: ^24.7.1
• jsdom: ^13.0.0
• knex: ^0.16.3
• lodash: ^4.17.11
• mocha: ^5.2.0
• mongodb: ^3.1.10
• mongoose: ^5.3.14
• pg: ^7.7.1
• pg-hstore: ^2.3.2
• power-assert: ^1.6.1
• query-string: ^6.10.1
• ramda: ^0.26.1
• redis: ^2.8.0
• sequelize: ^4.42.0
• sinon: ^7.1.1
• sinon-chai: ^3.3.0
• socket.io: ^2.2.0
• socket.io-client: ^2.2.0
• sqlite3: ^4.0.4

React (react preset)

Only available in Project Code Challenges.

• @babel/core: 7.4.3
• @babel/plugin-proposal-class-properties: 7.4.4
• @babel/preset-env: 7.4.3
• @babel/preset-react: 7.0.0
• @babel/runtime: 7.4.3
• @testing-library/dom: 5.2.1
• @testing-library/react: 8.0.1
• @testing-library/react-hooks: 1.0.2
• @testing-library/user-event: 4.1.0
• axios: 0.18.0
• babel-jest: 24.7.1
• classnames: 2.2.6
• cross-fetch: 3.0.4
• enzyme: 3.10.0
• enzyme-adapter-react-16: 1.15.1
• enzyme-to-json: 3.4.3
• escape-html: 1.0.3
• immer: 3.1.3
• jest: 24.9.0
• jest-dom: 3.5.0
• jest-environment-jsdom: 24.9.0
• jest-fetch-mock: 2.1.2
• jest-snapshot: 24.9.0
• marked: 0.8.0
• mobx: 5.9.4
• mobx-react: 5.4.3
• prop-types: 15.7.2
• react: 16.12.0
• react-cookie: 4.0.3
• react-dom: 16.12.0
• react-redux: 7.0.3
• react-router-dom: 5.1.2
• react-test-renderer: 16.12.0
• rebass: 3.1.2
• recompose: 0.30.0
• redux: 4.0.1
• reselect: 4.0.0
• sinon: 7.3.1
• styled-components: 4.3.2
• styled-system: 5.0.16
• use-immer: 0.3.3

Vue (vue preset)

Only available in Project Code Challenges.

• @babel/core: 7.4.4
• @babel/plugin-transform-runtime: 7.4.4
• @babel/preset-env: 7.4.4
• @babel/runtime: 7.4.4
• @testing-library/dom: 5.2.1
• @testing-library/vue: 1.0.3
• @vue/test-utils: 1.0.0-beta.29
• axios: 0.18.0
• babel-jest: 24.8.0
• babel-plugin-dynamic-import-node: 2.2.0
• cross-fetch: 3.0.4
• jest: 24.8.0
• jest-dom: 3.5.0
• jest-fetch-mock: 2.1.2
• jest-serializer-vue: 2.0.2
• jest-transform-stub: 2.0.0
• sinon: 7.3.2
• vue: 2.6.10
• vue-jest: vuejs/vue-jest#abcaaf2f0cc580d84f36c125110c7320d3f4a6b6
• vue-template-compiler: 2.6.10
• vuex: 3.1.1

Node 8

• axios: 0.15.3
• babel-core: 6.26.0
• babel-preset-env: 1.6.0
• babel-preset-react: 6.24.1
• babel-preset-stage-3: 6.24.1
• bignumber.js: 4.0.4
• bluebird: 3.5.1
• brain: 0.7.0
• canvas: 1.6.7
• chai: 3.5.0
• chai-http: 3.0.0
• chai-spies: 0.7.1
• cheerio: 0.22.0
• crypto-js: 3.1.9-1
• enzyme: 2.9.1
• escape-html: 1.0.3
• espower-loader: 1.2.2
• expect: 1.20.2
• express: 4.16.1
• faker: 3.1.0
• jsdom: 10.1.0
• lodash: 4.17.4
• mocha: 3.5.3
• moment: 2.18.1
• mongodb: 2.2.33
• mongoose: 4.10.8
• pg: 7.4.0
• power-assert: 1.5.0
• ramda: 0.23.0
• react: 15.6.2
• react-addons-test-utils: 15.6.2
• react-dom: 15.6.2
• react-redux: 4.4.8
• react-test-renderer: 15.6.2
• redis: 2.8.0
• redux: 3.7.2
• should: 8.4.0
• sinon: 1.17.7
• sqlite3: 3.1.13

Node 6

• axios: 0.15.3
• babel-core: 6.26.0
• babel-preset-env: 1.6.0
• babel-preset-react: 6.24.1
• babel-preset-stage-3: 6.24.1
• bignumber.js: 4.0.4
• bluebird: 3.5.1
• brain: 0.7.0
• canvas: 1.6.7
• chai: 3.5.0
• chai-http: 3.0.0
• chai-spies: 0.7.1
• cheerio: 0.22.0
• enzyme: 2.9.1
• escape-html: 1.0.3
• espower-loader: 1.2.2
• expect: 1.20.2
• express: 4.16.1
• faker: 3.1.0
• ganache-core: 2.1.0
• jsdom: 10.1.0
• lodash: 4.17.4
• mocha: 3.5.3
• moment: 2.18.1
• mongodb: 2.2.33
• mongoose: 4.10.8
• pg: 7.4.0
• power-assert: 1.5.0
• q: 1.5.0
• ramda: 0.23.0
• react: 15.6.2
• react-addons-test-utils: 15.6.2
• react-dom: 15.6.2
• react-redux: 4.4.8
• react-test-renderer: 15.6.2
• redis: 2.8.0
• redux: 3.7.2
• should: 8.4.0
• sinon: 1.17.7
• sqlite3: 3.1.13
• underscore: 1.8.3
• web3: 1.0.0-beta.34

Testing

Our JavaScript environment supports the following testing frameworks:

• javascript/mocha-bdd
• javascript/mocha-tdd
• javascript/karma-bdd
• javascript/karma-tdd
• javascript/cw-2
• javascript/jest