Error message: Conflicting type declarations across multiple files

I am facing a challenge with my TypeScript 'snippets' project. It seems that multiple .ts files contain type names (like Foo) that are the same.

//file-a.ts

type Foo = {

}
//file-b.ts

type Foo = {

}

When attempting to compile, I encounter the following error:

 error TS2300: Duplicate identifier 'Foo'.

This issue seems confusing to me because these typings should be limited to their respective modules.

The TypeScript version being used is 3.7.5, and in my tsconfig.json file, these properties are defined (all other settings are default):

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "outDir": "./dist",
    "rootDir": "./src",
    "isolatedModules": true,
    "strict": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true
  }
}

Can someone explain what might be causing this situation? Check out the actual code here.

Answer №1

In the realm of TypeScript, failing to export any elements from a file results in its compilation within the global scope. To transform a `.ts` file into an enclosed module, it is essential to export at least one entity.

Answer №2

Starting from version 4.7, TypeScript introduced a new configuration option specifically for this purpose: the compiler now offers the moduleDetection directive which can be set to "force".

This setting ensures that every non-declaration file is recognized and treated as a module.

With this feature enabled, all input files will be treated as modules regardless of whether they include any import or export statements.

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