Question: Why does the angular compiler can't find `GeolocationPosition` and `GeolocationPositionError`? VSC doesn't give an error and only during compiling it gives me an error.

```
Error: src/app/modules/shared/services/position.service.ts:10:46 - error TS2304: Cannot find name 'GeolocationPosition'.

10   private positionSource = new ReplaySubject<GeolocationPosition>(1);

```

I worked around this by putting the `any` type instead, but I'm just curious why Angular is giving me the error and how I can fix this.

I've already tried different compiler targets (`es5`, `es6`, `es2018`) but with no luck. Already installed `@types/core-js` but also without any luck. Is there any @types module that I'm missing perhaps?

This is my current tsconfig.json

```
{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es5",
    "module": "es2020",
    "lib": [
      "es2018",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "strictInjectionParameters": true,
    "strictInputAccessModifiers": true,
    "strictTemplates": true
  }
}

```

Answer: 
In typescript 4.0.x this type was called `Position`. In typescript 4.1.x it was renamed to `GeolocationPosition`.

I think you'll find that your VS Code is using its built in version of typescript and that your project is using an earlier version.

To fix:

```
npm install --save-dev typescript@4.1.2

```
I had the same issue and I solved changing local Angular CLI used by project.  

**Explanation**:  

I updated to Angular 11, but I forgot to update Angular CLI. The `ng build` gave me this output:

```
Your global Angular CLI version (9.1.7) is greater than your local
version (9.1.0). The local Angular CLI version is used.

```

**Steps**:  

Update Angular CLI (if necessary)

```
npm install -g @angular/cli

```

Update npm

```
npm install -g npm

```

Then `ng build` output become:

```
Your global Angular CLI version (11.1.2) is greater than your local version (9.1.0). The local Angular CLI version is used.

```

Install npm-check-updates

```
npm i -g npm-check-updates

```

Execute `ncu -u` to view packages to update.  

Execute `npm install` to update all packages.  

After this, all should work.