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How To Fix "Cannot be compiled under 'isolatedModules' because it is considered a global script file" in TypeScript - LearnShareIT

How To Fix “Cannot be compiled under ‘isolatedModules’ because it is considered a global script file” in TypeScript

In this article, we will explain what causes “Cannot be compiled under ‘isolatedModules’ because it is considered a global script file” in TypeScript. Some common causes of this error such as not adding import or export to the file or export a previously imported module. Let’s go into the specific situation and figure out how to fix it.

Why does “Cannot be compiled under ‘isolatedModules’ because it is considered a global script” file appear

You can use TypeScript to generate JavaScript code. However, some people only edit one file at a time, which means they can’t edit code that requires understanding the entire program.
The isolatedModules limitation can cause runtime problems for other TypeScript elements, such as const enums and namespaces. When the IsolatedModules flag is set, TypeScript will warn you when you write unknown code to a file.
If Isolated Modules are set to true, all executables must be modules (they have some type of input/output). An error occurs if the file module does not exist. Consider the following example when you create a file without import or export

Error Example:

// The error occurred because we did not add import or export to this file
const student = 'John'

another reason for the error is that you export a module after you have imported it

Error Example:

import { module } from "./module";

// Export a previously imported module
export { module };

Solution to solve

Add "export {}” output line

To define it as a module, we use the output line export {} in index.ts. A module is a file with import or export.

Example:

const student = "John";

// Errors can be resolved by adding export {}
export {};

If the file does not have an import or export format, it is considered a global file and the remote modules included in the tsconfig.json file do not support this format.
Make sure your project doesn’t have a .ts file yet, and if it does, add the output line export {} to switch to ES mode.
An empty file is considered raw text and cannot be contained in any module.
If the error persists, try setting IsolatedModules in tsconfig.json to false.

{
  "compilerOptions": {
    "isolatedModules": false
  }
}

Use the export type syntax

If isolatedModules is set to true, we must use the export type syntax to avoid an error.

Example:

import { module } from "./module";

// Using export type syntax to avoid an error
export type { module };

Summary

Through the article, we have fixed the error. This error occurs in different situations setting isolatedModules mode. Hope this article is helpful to you. Thanks for reading

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