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Additional properties don't throw errors in TypeScript, if the type shape matches, it's fine for TypeScript. There's a proposal for exact types: microsoft/TypeScript#12936 Some people suggested this utility type: ```ts type Exact<A, B> = A extends B ? (B extends A ? A : never) : never; ``` But I find it a bit cumbersome: `Exact<Event, Event>` So I left it out.
hansott
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bitterpanda63
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May 19, 2025
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Additional properties don't throw errors in TypeScript, if the type shape matches, it's fine for TypeScript.
There's a proposal for exact types: microsoft/TypeScript#12936
Some people suggested this utility type:
But I find it a bit cumbersome:
Exact<Event, Event>So I left it out.