Modules in tests?

For some reason, I am unable to use modules in tests.

ℹ (node:8988) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
ℹ F:\Chilli\WebstormProjects\juan\src\tests\utils.ts:1
ℹ import { test } from "node:test";
ℹ ^^^^^^
ℹ
ℹ SyntaxError: Cannot use import statement outside a module
ℹ     at internalCompileFunction (node:internal/vm:73:18)

If I try to make the file .mts instead of .ts, the error changes:

ℹ file:///F:/Chilli/WebstormProjects/juan/src/tests/utils.mts:2
ℹ Object.defineProperty(exports, "__esModule", { value: true });
ℹ                       ^
ℹ
ℹ ReferenceError: exports is not defined in ES module scope
ℹ     at file:///F:/Chilli/WebstormProjects/juan/src/tests/utils.mts:2:23
ℹ     at ModuleJob.run (node:internal/modules/esm/module_job:192:25)
ℹ
ℹ Node.js v20.0.0

while the utils.(m)ts file starts with

import { test } from "node:test";
let assert = require("node:assert");
import * as Utils from "../utils";

Note that I am unable to change my "module": "commonjs" in tsconfig.json and I cannot put "type": "module" in my package.json. If I do any of those, it still doesn't work, and the rest of my project breaks as well.

If I replace all the imports with let … = require(…) thing, it crashes on the first required export with a SyntaxError

Note that the tests do run with no problems if I call npx ts-node src/tests/utils.ts

This project uses the ts-node/esm loader internally, so it may cause issues with CommonJS:

ts-node-test/src/index.ts

Line 27 in e6cfd84

const esmLoader = pathToFileURL(require.resolve('ts-node/esm')).toString()

Can you try with esModuleInterop set to true in tsconfig.json?

You may also have this affect ts-node only, and not your build results: https://github.com/TypeStrong/ts-node/#via-tsconfigjson-recommended

Maybe related: nodejs/node#47880

Can you try with Node.js 18 just so we know whether the Node.js loaders issue is at the root of this problem?

This project uses the ts-node/esm loader internally, so it may cause issues with CommonJS:

ts-node-test/src/index.ts

Line 27 in e6cfd84

const esmLoader = pathToFileURL(require.resolve('ts-node/esm')).toString()

Can you try with esModuleInterop set to true in tsconfig.json?

You may also have this affect ts-node only, and not your build results: TypeStrong/ts-node#via-tsconfigjson-recommended

"esModuleInterop": true doesn't help. It still throws SyntaxError: Cannot use import statement outside a module.
Tests do work if I have "type": "module" in my package.json but then I cannot run my code as normal (TypeScript complains that .ts is not a valid file type??)

I managed to make it run like normal with "type": "module" by using tsx myself instead of ts-node

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Modules in tests? #64

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TheChilliPL commented on May 2, 2023

TheChilliPL commented on May 2, 2023

meyfa commented on May 2, 2023

meyfa commented on May 9, 2023

TheChilliPL commented on Jun 10, 2023

TheChilliPL commented on Jun 10, 2023

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