Angular: Can't find Promise, Map, Set and Iterator

After installing Angular, the Typescript compiler keep getting some errors about not finding Promise, Map, Set and Iterator.

Until now I ignored them but now I need Promise so my code can work.

import {Component} from 'angular2/core';
@Component({
    selector: 'greeting-cmp',
    template: `{{ asyncGreeting | async}}`
})
export class GreetingCmp {
    asyncGreeting: Promise = new Promise(resolve => {
// after 1 second, the promise will resolve
        window.setTimeout(() => resolve('hello'), 1000);
    });
}

Additional information:
npm -v is 2.14.12
node -v is v4.3.1
typescript v is 1.6

The errors:

```
................ERROS OF MY CODE.................
C:\Users\armyTik\Desktop\angular2\greeting_cmp.ts
Error:(7, 20) TS2304: Cannot find name 'Promise'.
Error:(7, 42) TS2304: Cannot find name 'Promise'.
.........................................
C:\Users\armyTik\Desktop\angular2\node_modules\angular2\platform\browser.d.ts
Error:(77, 90) TS2304: Cannot find name 'Promise'.
C:\Users\armyTik\Desktop\angular2\node_modules\angular2\src\core\application_ref.d.ts
Error:(83, 60) TS2304: Cannot find name 'Promise'.
Error:(83, 146) TS2304: Cannot find name 'Promise'.
Error:(96, 51) TS2304: Cannot find name 'Promise'.
Error:(96, 147) TS2304: Cannot find name 'Promise'.
Error:(133, 90) TS2304: Cannot find name 'Promise'.
Error:(171, 81) TS2304: Cannot find name 'Promise'.
C:\Users\armyTik\Desktop\angular2\node_modules\angular2\src\core\change_detection\parser\locals.d.ts
Error:(3, 14) TS2304: Cannot find name 'Map'.
Error:(4, 42) TS2304: Cannot find name 'Map'.
C:\Users\armyTik\Desktop\angular2\node_modules\angular2\src\core\debug\debug_node.d.ts
Error:(14, 13) TS2304: Cannot find name 'Map'.
Error:(24, 17) TS2304: Cannot find name 'Map'.
Error:(25, 17) TS2304: Cannot find name 'Map'.
C:\Users\armyTik\Desktop\angular2\node_modules\angular2\src\core\di\provider.d.ts
Error:(

Angular 5 with Typescript ^2.0.0

This should also work the same with earlier versions of Angular 2+.

To get this to work with typescript 2.0.0, I did the following.

npm install --save-dev @types/core-js

tsconfig.json

"compilerOptions": {
    "declaration": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "mapRoot": "./",
    "module": "es6",
    "moduleResolution": "node",
    "noEmitOnError": true,
    "noImplicitAny": false,
    "outDir": "../dist/out-tsc",
    "sourceMap": true,
    "target": "es5",
    "typeRoots": [
      "../node_modules/@types"
    ],
    "types": [
      "core-js"
    ]
  }

More about @types with typescript 2.0.0.

• https://blogs.msdn.microsoft.com/typescript/2016/06/15/the-future-of-declaration-files/

• https://www.npmjs.com/~types

Install Example:

npm install --save-dev @types/core-js

Duplicate Identifier errors

This is most likely because duplicate ecmascript 6 typings are already being imported from somewhere else most likely an old es6-shim.

Double check typings.d.ts make sure there are no references to es6. Remove any reference to es6 from your typings directory if you have one.

For Example:

This will conflict with types:['core-js'] in typings.json.

{
  "globalDependencies": {
    "core-js": "registry:dt/core-js#0.0.0+20160602141332" 
    // es6-shim will also conflict
  }
}

Including core-js in the types array in tsconfig.json should be the only place it is imported from.

Angular CLI 1.0.0-beta.30

If you are using the Angular-CLI, remove the lib array in typings.json. This seems to conflict with declaring core-js in types.

"compilerOptions" : {
  ...
  // removed "lib": ["es6", dom"],
  ...
},
"types" : ["core-js"]

Webstorm/Intellij Users using the Angular CLI

Make sure the built in typescript compiler is disabled. This will conflict with the CLI. To compile your typescript with the CLI you can setup a ng serve configuration.

Tsconfig compilerOptions lib vs types

If you prefer not to install core js type definitions there are some es6 libraries that come included with typescript. Those are used via the lib: [] property in tsconfig.

See here for example: https://www.typescriptlang.org/docs/handbook/compiler-options.html


Note: If --lib is not specified a default library is injected. The
default library injected is: ► For --target ES5: DOM,ES5,ScriptHost ►
For --target ES6: DOM,ES6,DOM.Iterable,ScriptHost

tl;dr

Short answer either "lib": [ "es6", "dom" ] or "types": ["core-js"] can be used to resolve can't find Promise,Map, Set and Iterator. Using both however will cause duplicate identifier errors.

Stack Overflow Q#35660498, score: 176