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You’ve learned how the TypeScript compiler works, and you are now able to successfully compile your TypeScript files. You can activate watch mode using the following command: Setting the compiler to watch mode means that your TypeScript file will be recompiled every time changes are made. To fix this, you can put the compiler in watch mode. Running the TypeScript compiler every time you make a change can be tedious. Typescript-project/dist/index.js "use strict"
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Write the following TypeScript code in index.ts: Inside of the src folder, create an index.ts file. Step 2 - Compiling the TypeScript Projectīefore you can begin coding your TypeScript project, create a folder within typescript-project called src. With TypeScript installed and your tsconfig.json file in place, you can now move on to coding your TypeScript app and compiling it. Setting "sourceMap" to true will allow you to quickly solve errors in the original TypeScript file.
When there are errors in your code or if there are changes that need to be made, it is best to debug the original source code rather than the compiled code. A sourcemap is a file that maps the new compiled JavaScript file to the original TypeScript file. When you run npx tsc to compile your TypeScript file, the compiled JavaScript file will be placed in the dist file.Ī sourcemap will also be created when you compile your TypeScript file. Giving "outDir" the value of "dist" will create a folder or directory called dist. Open tsconfig.json in your code editor of choice, and you will see the following default configurations: You can remove, add, and change configurations in this file to best meet your needs. This tsconfig.json file will allow you to configure further and customize how TypeScript and the tsc compiler interact. Using the -init flag in the above command will initialize your project by creating a tsconfig.json file in your typescript-project project directory. When you write code in TypeScript, running tsc will transform or compile your code into JavaScript. The tsc command is used here because it is the built-in TypeScript compiler. You can learn more about how npx works and when to use it here.
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npx allows us to run packages without having to install them globally. Npm also includes a tool called npx, which will run executable packages. With TypeScript installed, you can initialize your TypeScript project by using the following command:
This means that TypeScript is absolutely required for the development of your project. It is important to include the -save-dev flag because it saves TypeScript as a development dependency. With your project directory set up, you can install TypeScript: To begin your TypeScript project, you will need to create a directory for your project:
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To learn more about working with npm, check out this How To Use Node.js Modules with npm and package.json tutorial. You can accomplish this by following the How to Install Node.js and Create a Local Development Environment tutorial.