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Perhaps you concatenate something to each of your files.Įach build tool is different, but we’ll do our best to cover the gist of things. You might have some more build steps in your pipeline. TypeScript will also warn about unreachable code and labels, which you can disable with allowUnreachableCode and allowUnusedLabels respectively. noFallthroughCasesInSwitch which is helpful if you never want to forget a break statement between cases in a switch block.noImplicitReturns which prevents you from forgetting to return at the end of a function.You can also catch certain bugs with options like: If you open up an editor like VS Code or Visual Studio, you’ll see that you can often get some tooling support like completion. Early BenefitsĮven at this point you can get some great benefits from TypeScript understanding your project. You should now have TypeScript working with your project. The layout of files in built should look identical to the layout of src. Translate newer JavaScript constructs down to an older version like ECMAScript 5 (using target).Īt this point, if you try running tsc at the root of your project, you should see output files in the built directory.

Emit all of the output files in built (with outDir).

Accept JavaScript files as inputs (with allowJs).

Read in any files it understands in the src directory (with include).

Here we’re specifying a few things to TypeScript: In this case, you might already have a folder structure like this set up.įrom this point on, we’re going to assume that your directory is set up something like this: You might also be running some intermediate steps on your JavaScript, such as bundling or using another transpiler like Babel. If your output files need to reside in a specific directory, then that will be your output directory. If that’s the case, the files that you’ve written are going to be used as inputs to TypeScript, and you’ll run the outputs it produces.ĭuring our JS to TS migration, we’ll need to separate our input files to prevent TypeScript from overwriting them. js files are in a src, lib, or dist directory, and then run as desired.

If you’re writing in plain JavaScript, it’s likely that you’re running your JavaScript directly, If you’re looking to convert a React project, we recommend looking at the React Conversion Guide first. We assume you’ve read enough of the handbook to write new TypeScript code. In this tutorial, we’re going to look at how you might start out. It was built with the JavaScript ecosystem in mind, and a lot of JavaScript exists today.Ĭonverting a JavaScript codebase over to TypeScript is, while somewhat tedious, usually not challenging.