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"Cannot find name 'require'" Error in Typescript - How To Solve It? - LearnShareIT

“Cannot find name ‘require'” Error in Typescript – How To Solve It?

Cannot find name ‘require’ error in typescript

If you are having trouble with the “Cannot find name ‘require'” error in Typescript and don’t know how to fix it, let’s follow this article. We will help you understand about the cause of this error and give you some ways to fix it.

The cause of this error

In a TypeScript file, if you don’t install the ‘@type/node’ module and still use the Node.js require() function, Typescript will return the “Cannot find name ‘require'” error. Let’s select the correct one for your current TypeScript version to fix error message.

To fix the “Cannot find name ‘require’” error in TypeScript, let’s follow the next part.

How to solve the “Cannot find name ‘require'” error in Typescript?

TypeScript 2.x

Step 1: Install @types/node

In a project, to install the ‘@types/node’ package, you can choose one of two ways: Run the command

npm i -D @types/node or npm install @types/node --save-dev. Specifically as follows:

Terminal / PowerShell

npm install @types/node --save-dev
  • npm install will directly install your package
  • –save-dev will include the third-party package in your project’s dependencies.
  • @types/node is which will be installed

It doesn’t work? Let’s trying other method:

Terminal / PowerShell

npm i -D @types/node

The ‘@types/node’ package will be installed shortly. To make sure that it’s be installed, open tsconfig.json file. Check contains ‘@types/node’ version like the below example:

...
"types": [ "node" ],
"typeRoots": [ "../node_modules/@types" ]
...

Do the same way with Angular CLI, with CLI you can follow the Webpack step above and add the “types” block to your tsconfig.app.json.

"compilerOptions": {
	// other options
    "types": [
    	"node"
    ]
}

Make certain that is the file in ‘src’ folder and no one on the root application folder.

By default, any package below ‘@types’ is already included in your construct unless you’ve got designated both of these options. Read more.

Step 2: Try to declaring ‘require’

Let’s try to declare ‘require’ in a variable to know if this error still exists.

For example:

Also, we can try converting ‘require’ using ES6 import syntax. For instance below:

import { function } from 'example-module';

Is there still a message error? Delete and reinstall ‘node_module’ and ‘package-lock.json’ file.

Step 3: Delete and reinstall

Delete all node.js module.

Terminal / PowerShell

rm -rf node_modules package-lock.json

Reinstall by this below method:

Terminal / PowerShell

npm install

After that, node.js will be reinstalled and you can try using ‘require’ syntax in your project now.

TypeScript 1.x

  • Step 1: Install ‘@typings’

Terminal / PowerShell

npm install typings -g --save-dev
  • Step 2: Install requireJS type definition

Terminal / PowerShell

typings install dt~node --save --global

Using typing (DefinitelyTyped’s replacement) a definition can be specify.

Summary

The “Cannot find name ‘require'” error in Typescript occurs when your project doesn’t install the ‘@types/node’ package or ‘require’ is not imported in your project. We hope you can know how to fix it after following this tutorial. If you have any questions, please leave a message. We will reply to you as soon as possible. Happy coding.

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