Install Yarn:

Each assignment needs some tools to run the tests:

They can be installed running this command within each assignment directory:

1
$ yarn install

You must run install before you are able to run the tests.


Help us explain this better! File a GitHub issue at https://github.com/exercism/typescript/issues if you have suggestions, or submit a patch with improvements to the https://github.com/exercism/typescript/blob/master/docs/INSTALLATION.md file.