microsoft / microsoft/TypeScript
Error output: Don't deep compare to native objects
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@DanielRosenwasser is already working on this.
Since Oct 9, 2018.
Committed
Domain: Error Messages
Rescheduled
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Description
TypeScript Version: 3.1.0-dev.201xxxxx
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Currently if we assign not assignable type to a variable, ts shows a deep 'not assignable' error with mark all not compatible fields. Even for a native objects like Array, Promise, Date etc...
But I think this is too noisily. All I want to know is that my type in not assignable to Array. Don't try to compare guts of Array with my type.
Code
type A = {a: string}
var y:A = {a: ''}
var x0: string = y; // Type 'A' is not assignable to type 'string'. -- it's ok!
var x1: A[] = y; // Property 'length' is missing in type 'A'.
var x2: Promise<A> = y; // Property 'then' is missing in type 'A'.
var x3: Date = y; // Property 'toDateString' is missing in type 'A'.
var x4: Node = y; // Property 'baseURI' is missing in type 'A'.
Expected behavior:
Actual behavior:
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