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TypeScript Version: 2.3.2
Code
class A { a: number; } class Aplus extends A { plus = () => true; } function newAplusAsync(): Promise<Aplus> { return Promise.resolve(new A()); } (async () => { const aplus = await newAplusAsync(); console.log(aplus.plus()); })();
Expected behavior: Compiler error: Type 'Promise<A>' is not assignable to type 'Promise<Aplus>'
Type 'Promise<A>' is not assignable to type 'Promise<Aplus>'
Actual behavior: Runtime error: aplus.plus is not a function
aplus.plus is not a function
The text was updated successfully, but these errors were encountered:
Should be fixed by #15104, fix should be available today in typescript@next.
typescript@next
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TypeScript Version: 2.3.2
Code
Expected behavior:
Compiler error:
Type 'Promise<A>' is not assignable to type 'Promise<Aplus>'
Actual behavior:
Runtime error:
aplus.plus is not a function
The text was updated successfully, but these errors were encountered: