fix(repl): specify ts loader

[vaakian]

Problem

TypeScript REPL can't actually execute TypeScript expressions

Reason

It detected a wrong loader(js) because in core-utils that path.extname('.ts') returns an empty string, so it will add a .js suffix to the filePathand then a js loader is detected.

see transform/get-esbuild-options.ts#L35

there's also another solution I prefer:

transform(code, 'repl', { loader: 'ts' })

[privatenumber]

Thanks for catching this & the PR!

[privatenumber]

🎉 This PR is included in version 3.5.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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