Add type definitions, please?

[ajvincent]

TypeScript complains:

Could not find a declaration file for module 'gulp-prettier'. '.../node_modules/gulp-prettier/index.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/gulp-prettier` if it exists or add a new declaration (.d.ts) file containing `declare module 'gulp-prettier';`ts(7016)

This really just needs an index.d.ts file which package.json refers to using the "typings" key.

The contents of this file I do not know off the top of my head. I know how to write TypeScript type definition files. I just haven't worked with NodeJS streams very much.

[thomasvantuycom]

Apologies for the delayed response. I don't personally use TypeScript, and after a quick check, it seems that none of the more widely-used Gulp packages—nor Gulp itself—include typings. I believe the solution to your issue might be found in this Stack Overflow thread: https://stackoverflow.com/questions/41292559/could-not-find-a-declaration-file-for-module-module-name-path-to-module-nam, rather than modifying this package directly.

[ajvincent]

In my defense, there is @types/gulp, which comes from DefinitelyTyped.

[thomasvantuycom]

No defense needed, no one's under attack here. But so, the solution for you is to add a new declaration (.d.ts) file containing declare module 'gulp-prettier';, which you may or may not have to reference in your tsconfig.js file.