Cannot import extensionless

If I include the .ts extension, typescript will complain:

TS2691: An import path cannot end with a '.ts' extension

If I don't include the .ts extension, ts-node will complain:

throw new ERR_MODULE_NOT_FOUND(
          ^
CustomError: Cannot find module

Why is this? Why does it work fine for tsc but not ts-node?

It doesn't work fine for tsc though, since you get that error.

Relative import paths need full extensions (we have to write import "./foo.js" instead of import "./foo").

TSC's rule is that it has to be the emitted extension, so it has to be .js. ts-node does the right thing to make this work.

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