Type checking for host bindings

[jelbourn]

Angular does not currently perform type checking for @Component and @Directive host bindings. This is a gap in Angular's otherwise robust template type checking system that leaves the door open to typos and type mismatches.

• Introduce an option for host binding type checking
• Devise and execute a rollout plan to make this the new default behavior

[salztorte]

How is the status of this?

[robmv]

The only reason I still use the decorators, that now are there only for backward compatibility, and haven't migrated to the host property is this.

[crisbeto]

Type checking of host bindings will be available behind the typeCheckHostBindings flag in v20. It'll be enabled by default in v21.

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