Typescript compiler failing with strange error

Question

I'm getting the following error:

events.js:141
      throw er; // Unhandled 'error' event
      ^
TypeScript error: node_modules/gulp-typescript/release/compiler.d.ts(32,22): Error TS1005: '=' expected.

My gulpfile https://github.com/rtaycher/2048-Clone/blob/master/gulpfile.js

I also have a declaration file global.d.ts:

interface Array<T> {
    includes(searchElement: T) : boolean;
}

Some googling indicates that declaration files might cause issues.

Answer 1

Error TS1005: '=' expected

The error is two fold.

• an old version of the definition file eg this verion has readonly https://github.com/ivogabe/gulp-typescript/blob/3645edb57278a22e08e6ae9780dc09b8ae68003e/release/compiler.d.ts#L32

• an old version of the compiler that doesn't support new keywords (like readonly ).

Personal opinion

Please use TypeScript nightlies otherwise it will always be an uphill / confusing battle. 🌹