typescript - ts An async function or method in ES5/ES3 requires the 'Promise' constructor

Question

Hello I'm Using async/await in my TypeScript Project, But I Get this log:

[ts] An async function or method in ES5/ES3 requires the 'Promise' constructor. Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your --lib option.

How Can I Solve That?

Answer 1

As the error message says, add lib: es2015 to your tsconfig.json

// tsconfig.json
{
  "compilerOptions": {
    "lib": [ "es2015" ]
  }
}

UPDATE: if this doesn't work for you, try this:

JetBrains IDE such as WebStorm, use its own implementation by default. Make sure you configure it to use TypeScript language service instead.

For Visual Studio, the project files and tsconfig.json are mutually exclusive. You will need to configure your project directly.

https://github.com/Microsoft/TypeScript/issues/3983#issuecomment-123861491