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Angular 2.0(beta) - Invalid module name in augmentation, module '../../Observable' cannot be found.

When trying to use Angular 2.0 (beta) in Visual Studio 2015, the TypeScript compiler generated the following error message:

Error    TS2664    Invalid module name in augmentation, module '../../Observable' cannot be found.   

Here is the package.json I was using:

{
"name": "angular2-quickstart",
"version": "1.0.0",
"scripts": {
"start": "tsc && concurrently \"npm run tsc:w\" \"npm run lite\" ",
"lite": "lite-server",
"postinstall": "",
"tsc": "tsc",
"tsc:w": "tsc -w",
"typings": "typings"
},
"license": "ISC",
"dependencies": {
"angular2": "2.0.0-beta.17",
"systemjs": "0.19.27",
"es6-shim": "^0.35.0",
"reflect-metadata": "^0.1.3",
"rxjs": "5.0.0-beta.4",
"zone.js": "^0.6.12",
"bootstrap": "^3.3.6"
},
"devDependencies": {
"concurrently": "^2.0.0",
"lite-server": "^2.2.0",
"typescript": "^1.8.10",
"typings":"^0.8.1"
}
}
view raw package.json hosted with ❤ by GitHub

The problem seems to be related to the combination of the RxJs and Angular version I was using. To fix it, I had to change the RxJs version from

"rxjs": "5.0.0-beta.4"

to

"rxjs": "5.0.0-beta.2"

After NPM installed the correct packages, the TypeScript error disappeared.

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