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Error "TS2320" when interface extends interface that has optional member and another interface that has same named required member #3598

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@MrKomish

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@MrKomish

I have 3 interfaces:

interface A {
    member1: string;
    ...
}

interface B {
    member1?: string;
    ...
}

interface C extends A, B {
    ...
}

I'm getting TS2320: [Object Object] error,
because interface A's member1 is required property, and B's member1 is optional.

How to resolve it?

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