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For example, NodeJS doesn’t support the ES6 package import syntax by default, but by using Babel in our project we can use it. We can install it as a development dependency from yarn: $ yarn add mocha -dev Babelīabel is a JavaScript compiler that allows us to use the latest and greatest JavaScript language features in NodeJS. Using Mocha in our project will provide a uniform template for structuring our test suites. Mocha is a popular framework for structuring and running test suites, traditionally used by developers writing unit tests in JavaScript projects. We are adding it in this manner to signify that this package doesn't need to be shipped with the app source code. Note: The -dev flag ensures that our package is downloaded as a development dependency and will be listed under the devDependencies list in our package.json. We can install as a development dependency from yarn: $ yarn add webdriverio -dev WebdriverIO is a popular JavaScript Appium client that provides its own API for issuing Appium commands.