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

问题:

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?

回答1:

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

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

回答2:

Try this package which contains type definitions for es6-promise

npm install --save @types/es6-promise

回答3:

If you are on VS, delete the tsconfig.json and right click open Properties->TypeScript Build in General change the followings

• ECMAScript version: ECMAScript 6

• Module System: ES2015

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