he/him 
I find myself using `{[key: string]: mixed}` so much for dynamicish data that I feel like Flow/TypeScript should make it a built-in.
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This ends up in most of my projects: type Dict<T> = { [key: string]: T }
Ohhh I like this. I could also just shove it in a typelib if I'm too lazy to import it (which I am).
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Just looked at the first project I put that in. Here are the types: export type NumericallyKeyed<T> = { [index: number]: T, }; export type Dict<T> = { [index: string]: T, }; NumericallyKeyed lets you do keyof on an Array without getting method names.
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Hold on... Wouldn't the first type... just be an array? Where would you specifically need a type with a number index without it being at least ArrayLike?
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Lodash types include a dictionary type. Really useful.
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Dict is an importable type from lodash, too.
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