![]() Note the use of the older 0.17.3 version of Reify rather than the newer 0.18.1 version. Launching the VS Code debugger "Test" task should now allow full debugging functionality. "internalConsoleOptions": "openOnSessionStart" VS Code knows about the structure of this file, and so will attempt to guide you with hints and autocompletion. ![]() To do so, create the file package.json at the top-level of your project. ![]() It supports nested testing contexts, before/after hooks, and plain text descriptions. Mocha is an automated testing framework for Node.js and the browser. To exit, click the filled red square button. Line 4 will be highlighted, and a debugging menu will appear in the center-top part of the screen. Clicking this button runs the current file in debugger mode. A green triangle sits to the upper left of the palette. Add properties to it by right-clicking.īegin a debugging session by clicking on the bug icon to the left. Disable the breakpoint by left-clicking again. A filled red circle will appear indicating that the breakpoint has been set. Set a breakpoint by left clicking to the left of the line number 3. After installing VS Code, set up a test project containing the file test.js: // test.js const foo = 123 All the functionality of the rich in-browser debugging experience is there. Hover over a variable in the source code to get its current value. Set a breakpoint, run the project in debugger mode, and away you go. ![]() The crown jewel of VS Code is its integrated debugger. This becomes most apparent when tools are forced to work together. However, changes to the module system cut across a wide range of tools. An object is exported through declaration: // name.js var name = 'foo' Īnd imported with the import statement: // greet.js import name from './name.js' console.log( 'Hello, ' + name) ĮS Modules are now natively supported by all major browsers and Node.js. For example, the name/greet example can be recast with the introduction of the export and import statements. The promise of code that runs unmodified in both environments never quite panned out because of all the ad hoc tooling needed to retrofit a module system onto the browser. This system works well enough for code restricted to server environments, but quickly runs into trouble on the browser. A module can export one or more designated objects for use in other files.įor example, a CommonJS module declares what to export by making assignments to its module object: // name.js var name = 'foo' Īnd a module consumes another module's export by invoking its require function: // greet.js var name = require( './name.js') The one adopted by Node.js, CommonJS, treats each file as an independent module with its own scope. This situation made it very difficult develop and integrate independent software packages.Ī number of solutions to this problem sprang up. For most of its existence, the only compositional tool was the order in which tags appeared in the parent HTML document. A browser's JavaScript runtime dumps all variables into the global scope by default. Most programming languages support freestanding code blocks and low-level dependency management out of the box. If you're familiar with unit testing JavaScript with Mocha and VS Code debugging, skip to the section Debugging with Reify. This article was written with no assumptions other than that your system runs Node 11.6+ and VS Code 1.30.2+. This article describes how to use ES modules within a very specific, but common environment: debugging Mocha tests running on Node.js in Microsoft's Visual Studio Code (VS Code). Given their recent emergence from alpha, however, support for ES Modules can vary across tools. Currently supported in modern browsers and Node.js for many months now, ES Modules will over time render various ad-hoc module systems currently in use obsolete. The ES Module standard defines a way to build and assemble JavaScript modules. Debugging ES Modules in Node.js and Mocha Using VS Code
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