In TypeScript, there is an error with Promise resolve when a type is not specified

Currently, I am using gulp for compiling TS files into JS. In the following code snippet:

function Hello(): Promise<string> {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Hello, World!');
    }, 3000);
  });
}

An error occurs during compilation:

error TS7006: Parameter 'resolve' implicitly has an 'any' type.

This error indicates that I need to use any type in this manner:

return new Promise((resolve: any) => {

However, why do I have to use any when I've already defined the Promise as Promise<string>? This seems contradictory.

Here are the dependencies listed:

"dependencies": {
    "gulp": "^4.0.2",
    "gulp-typescript": "^6.0.0-alpha.1",
    "typescript": "^3.9.5"
  }

Thank you

javascripttypescript

Answer №1

If you're running into an issue where the TS compiler doesn't recognize the Promise type, it could be due to a lack of proper configuration. It's possible that TS is compiling for ES5, which doesn't include support for promises. Make sure to update your tsconfig.json file by following the instructions on this page. You may need to add the following code snippet to tsconfig.json:

"compilerOptions": {
    "target": "ES6"
}

Answer №2

After making changes to the gulpfile.js, I successfully resolved:

gulp.task('ts', function () {
  return gulp.src('*.ts')
  .pipe(ts({
    noImplicitAny: true,
    outFile: 'output.js',
    target: 'ES6'
  }))
  .pipe(gulp.dest('./'));
});

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