Despite implementing ECMAScript 6, Typescript is still unable to locate the name 'Promise'

I'm currently working on developing a node.js application in Visual Studio 2015, but I keep encountering an issue:

TS2304 Cannot find the name 'Promise'

In my project settings, I have ECMAScript 6 set up as the build system and ES 2015 as the module system.

I've already attempted the following:

  • how to use es6-promises with typescript?

  • How to use Typescript with native ES6 Promises

Unfortunately, none of these solutions have been successful for me. Interestingly, the second link suggests that it should work with ECMAScript version set to 6, but that hasn't resolved the issue for me.

EDIT: After more investigation, I've identified the root cause to be a mismatch between the ECMAScript Versions utilized by IntelliSense and the build system.

This became apparent when using additional ECMAScript 6 functions, triggering the following IntelliSense error:

TS1311 Async functions are only available when targeting ECMAScript 6 and higher.

So my new question is: Where can I specify the ECMAScript version that IntelliSense should utilize?

javascripttypescriptvisual-studio-2015es6-promise

Answer №1

It appears that there was an oversight in the code (I encountered a similar issue). The solution is straightforward - by installing the type definition .d.ts files, you can resolve the problem.

For those utilizing Nuget, the issue can be resolved by executing the following command in the Package Manager console:

PM> Install-Package es6-promise.TypeScript.DefinitelyTyped

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