Typescript compiler error when running tests using Vitest

See original GitHub issue

Prerequisites

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Fastify version

3.28.0

Node.js version

Operating system

macOS

Operating system version (i.e. 20.04, 11.3, 10)

12.3

Description

I would like to test my fastify app using vitest, however I have noticed there is a typescript error I can’t seem to get around.

When I run my tests Fastify errors, fastify-autoload cannot import plugin ... . To fix this error compile TypeScript to JavaScript or use 'ts-node' to run your app..

I can successfully run the tests when I compile them to Javascript and import the javascript version in the test. This does however, feel a bit hacky. It can also impact the code coverage (depending on how you are generating the javascript).

Steps to Reproduce

Stackbliz link: https://stackblitz.com/edit/node-sdwsoh

Run the npm run test command.

Expected Behavior

Tests can be run in vitest using Typescript without having to compile first, and import the javascript version.

Issue Analytics

State:
Created a year ago
Reactions:4
Comments:39 (21 by maintainers)

Top GitHub Comments

2reactions

Uzlopakcommented, Oct 12, 2022

I have a potential PR

1reaction

jclaessens97commented, Oct 14, 2022

Might be a config issue on my side, but when I now try my repro again (with the updated package), I get the following:

TypeError: Unknown file extension ".ts" for /Users/jclaessens/dev/github/vitest-alias-repro/packages/api/src/plugins/cors.ts
Serialized Error: {
  "code": "ERR_UNKNOWN_FILE_EXTENSION",
}

This is the same issue I got when I tried to do the changes myself.

Again, it might be a config issue on my side, but it’s unclear to me at this point.