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Jest test files should be JavaScript only

Jest test files should be JavaScript only


This document represents an architecture decision record (ADR) and has been mirrored from the ADR section in our Shopware 6 repository. You can find the original version here


There is a mix of both JavaScript and TypeScript Jest test files in the Administration. Respectively *.spec.js and *.spec.ts files. We want to settle on one format, to keep it uniform.

Current distribution

There are 46 *.spec.ts and 620 *.spec.js files.

Known problems with TypeScript Jest test files

  • The TypeScript eslint no-unused-vars rule is broken in Jest test files
  • There is no type safety for components, because vue-test-utils will just type to any Vue component
  • Several editors loose the Jest context for *.spec.ts files
  • The Jest config only adds globals to *.spec.js files
  • TypeScript linting was disabled for *.spec.ts files, therefore they are more like *.spec.js files


Accounting the current distribution and the known problems we face with *.spec.ts files, we decided to use *.spec.js files from now on.


All existing *.spec.ts where moved to *.spec.js files and TypeScript specific code was removed. Additionally to prevent new *.spec.ts files an eslint rule was added which prevents new files to be added.