Document needing ts-node

[zkldi]

Perhaps I'm missing something obvious - as of v15 I cannot get module-based typescript to work.

Running with the TS flag set and typescript installed, I get

SyntaxError: Cannot use import statement outside a module

Enabling `"type": "module" in package.json results in

Can't run my Node.js Typescript project TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension “.ts” for (file)

And according to SO, the fix for that is to remove "type": "module". This happens regardless of what tsconfig's opinions on the output of TS is (I have it set to CommonJS, but it doesn't change anything).

[zkldi]

Update: This can be fixed by manually installing ts-node (similar to how you have to now manually install typescript), but this is not documented anywhere. Can submit a pull request to add this to the docs in a bit.

A warning should possibly be emitted if the TS flag is set but ts-node is not present, as at the moment it silently defaults to JS loading.

[StarpTech]

@zkldi thank you! Complete solution is:

1. Install typescript, ts-node, @types/tap
2. Run tap --ts

There is a typo in the docs it's --ts not -ts.

[zkldi]

PR in #744

[zkldi]

Closed as #744 got merged.