Add .cts file extension

[cspotcode]

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Our thoughts on feature requests

Lots of developers rely on gulp, so we don't make big changes very often. Not every feature request will be added to gulp, but hearing about what you want is important. Don't be afraid to submit a feature request!

Describe your idea for a new feature

Add .cts file extension, with the same treatment as .ts.

Explain the problem your idea is trying to solve

In projects with package.json "type": "module", .ts files are treated as native ESM, so people may choose to write their config files with a .cts file extension instead. This file extension is supported by TypeScript and ts-node.

How will it benefit gulp and its users?

Users can write config files with the .cts file extension, and interpret will be able to execute them.

If this feature could exist outside of gulp (like as a plugin or a module), would you be interested in helping to create and maintain it?

[cspotcode]

Note that there is also the .mts file extension, but that executes as ESM, so would typically require using node --loader ts-node/esm