CLI should allow @angular/compiler-cli@5.1.0 to run TS 2.5.x

[cexbrayat]

Versions

Angular CLI: 1.6.0
Node: 8.9.1
OS: darwin x64
Angular: 5.1.0
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cli: 1.6.0
@angular-devkit/build-optimizer: 0.0.35
@angular-devkit/core: 0.0.22
@angular-devkit/schematics: 0.0.41
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.9.0
@schematics/angular: 0.1.10
@schematics/schematics: 0.0.10
typescript: 2.5.3
webpack: 3.10.0

Repro steps

Create a new repo with cli 1.6.0 (generates a project with ng 5.1.0)
Bump TS to 2.5.x
Run ng serve

Observed behavior

@angular/compiler-cli@5.1.0 requires typescript@'>=2.4.2 <2.5.0' but 2.5.3 was found instead.
Using this version can result in undefined behaviour and difficult to debug problems.

Please run the following command to install a compatible version of TypeScript.

    npm install typescript@'>=2.4.2 <2.5.0'

To disable this warning run "ng set warnings.typescriptMismatch=false".

Desired behavior

Angular 5.1 now officially support TS 2.5 (since 5.1.0-beta.1), so the CLI should not give this warning.

[cexbrayat]

Duplicate of #8768

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