TypeScript file "is not a module"

Question

I have a really basic Typescript file being imported into a Register.tsx file. I keep getting the following error when building with npm.

test.ts' is not a module

test.ts

export class Tester {
    test(): string {
        return "test";
    }
}

Register.tsx

import { Tester } from "./../test"

I've read several different solutions but I can't see anything I'm doing wrong or different. Am I missing something glaringly obvious? I'm new to Typescript / npm / Webpack.

I changed the file to a .tsx extension and it compiles now. I'm not happy with this temporary solution though. — Mike T.
– Mike T., Commented Jul 27, 2018 at 16:46
You might try some of the answers of this question: File 'app/hero.ts' is not a module error in the console, where to store interfaces files in directory structure with angular2? — Heretic Monkey
– Heretic Monkey, Commented Jul 27, 2018 at 17:50

Matthew Marichiba · Accepted Answer · 2018-07-27 16:59:44Z

5

Does test.ts export anything else or access the module object? My experience is that TypeScript throws the 'not a module' warning whenever if it sees the NodeJS module object, which NodeJS uses for exports instead of the TS export notation.

My team has an environment in which we include plain JavaScript files into certain TypeScript projects, and we get the same 'not a module' warning whenever importing anything with lines like: module.exports = X or module.exports.thing = X (which happens to be all of the plain-Javascript files.)

answered Jul 27, 2018 at 16:59

Matthew Marichiba

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1 Comment

Mike T. Over a year ago

It doesn't. The file exists entirely of what was posted above. I tried to make it as bare bones as possible to fix the compiler error.

JR Utily · Accepted Answer · 2021-01-03 15:50:03Z

3

When this happened to me, restarting my yarn dev did solved the issue. It seems tsc is not restarted completely when watch reload, and that it does not discover new files properly...

answered Jan 3, 2021 at 15:50

JR Utily

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