tests/cases/compiler/genericArrayExtenstions.ts(1,22): error TS2420: Class 'ObservableArray<T>' incorrectly implements interface 'T[]'.
Property 'length' is missing in type 'ObservableArray<T>'.
==== tests/cases/compiler/genericArrayExtenstions.ts (1 errors) ====
export declare class ObservableArray<T> implements Array<T> { // MS.Entertainment.ObservableArray
~~~~~~~~~~~~~~~
!!! error TS2420: Class 'ObservableArray<T>' incorrectly implements interface 'T[]'.
!!! error TS2420: Property 'length' is missing in type 'ObservableArray<T>'.
concat<U extends T[]>(...items: U[]): T[];
concat(...items: T[]): T[];
}
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