You can do more to customize ESLint as well if you need to, which I might save for another post. Tests run in the background, and Test Explorer automatically updates and shows the results. Or, you can run tests by selecting one or more tests or groups, right-clicking, and selecting Run from the shortcut menu. Resolving this, we see “No problems have been detected”:ĮSLint can then be used for various validation scenarios as you write your code, e.g. Run tests in Visual Studio You can run the tests by clicking the Run All link in Test Explorer. We see the HelloWorld function has a red underline the error:Īnd we see a summary of our problems from clicking in the bottom left on the error icons:Īnd we can click on each error to get a better description and solution from the ESLint website: Now if we go to the JavaScript file, we see we’re getting errors reported: Let’s install the ESLint extension for VS Code: Now, if we look at our JavaScript file, we see it looks pretty much the same: Our project now looks like this, with an eslintrc.json file created: We will select the middle option:Ĭontinue to select whichever answers make the most sense to you and your project, then click to install any dependencies: We can use our cursor to choose any of the options. Now let’s initialize ESLint with eslint –init. We see eslint installed globally through the list command: npm list -g -depth=0 You can click Enter on all the options to choose all as defaults: Now run npm init to initial this project as a node project: You can see we have one function, and in that function, we are calling console1.log, which is a mistake (it should be console.log): You will need node and npm installed.įirst, let’s create a new directory and open the directory in VS Code: In this post, we will look at how to set up ESLint in Visual Studio Code, in order to check JavaScript files for errors. ESLint is a linter that runs in Visual Studio Code to analyze code for possible errors.
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