Angular-cli: Add new script 'ng update'

[yokots]

Feature Request

- [X] feature request

Description

When update the version of angular/cli, use ng update to update the configuration files like tsling.json and tsconfig.json etc. or and postinstall hooks to auto update the configuration files.

[BurningDog]

That would be great, but any of these things could have been manually changed. What if the author wants those changes preserved? Then any time angular-cli is upgraded their changes would be overwritten.

Currently when I upgrade angular-cli, I generate an entirely new project structure and then compare every file I can find against my own files, including:

• versions in package.json
• new packages in packages.json
• .angular-cli.json
• karma.conf.js
• protractor.conf.js
• tsconfig.json
• tslint.json
• src/polyfills.ts
• src/test.ts
• src/tsconfig.app.json
• src/tsconfig.spec.json

It's some manual work but I'm not sure how this could be automatically done.

[nekkon]

There are many issues created from developers that do not update their apps properly, probably because they think that just changing the version in package.json is enough. There is #7334 and many more issues because of this.

[filipesilva]

This is something that we talk about every now and then... It's true that a lot of issues are due to bad upgrades. Configuration items like the ones listed by @BurningDog could be upgraded automatically. A health check would also be nice, like verifying incompatible options or packages aren't set.

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