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jamesseanwright/ts-mapped-types-minus.ts

Created September 7, 2020 09:59
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Using the minus operator in TS mapped types
Raw
ts-mapped-types-minus.ts
interface Person {
readonly name: string;
age?: number;
}
type WellFormedMutable<T> = {
-readonly[K in keyof T]-?: T[K];
};
const p: WellFormedMutable<Person> = {
name: 'Bob',
age: 21,
};
p.name = 'Roy';
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