'SolidJS: Typescript error says value is of type 'undefined' despite checking that it isn't

I have some SolidJS code like:

{value() !== undefined && <img src={srcs[value()]} />}

where value is a signal. I get a TypeScript error under value() saying Type 'undefined' cannot be used as an index type.ts(2538)

What does this mean and how do I fix this without // @ts-ignore?

solid-js


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