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Ibro/typescript-intersection-types-overlap.ts

Last active March 28, 2017 06:15
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TypeScript intersection types properties overlap error
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typescript-intersection-types-overlap.ts
interface X {
c: string;
d: string;
}
interface Y {
c: number;
e: string
}
type XY = X & Y;
type YX = Y & X;
let p: XY;
let q: XY;
p.c = 4; // Error: Type '4' is not assignable to type 'string & number'
q.c = 3; // Error: Type '3' is not assignable to type 'string & number'
p.c = 'text'; // Error: Type 'text' is not assignable to type 'string & number'
q.c = 'text'; // Error: Type 'text' is not assignable to type 'string & number'
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