| 1 | import { Context } from './context'
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| 2 |
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| 3 | /*
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| 4 | next's parameter is in a contravariant position, and thus, trying to type it
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| 5 | prevents assigning `MiddlewareFn<ContextMessageUpdate>`
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| 6 | to `MiddlewareFn<CustomContext>`.
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| 7 | Middleware passing the parameter should be a separate type instead.
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| 8 | */
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| 9 | export type MiddlewareFn<C extends Context> = (
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| 10 | ctx: C,
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| 11 | next: () => Promise<void>
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| 12 | ) => Promise<unknown> | void
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| 13 |
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| 14 | export interface MiddlewareObj<C extends Context> {
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| 15 | middleware: () => MiddlewareFn<C>
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| 16 | }
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| 17 |
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| 18 | export type Middleware<C extends Context> = MiddlewareFn<C> | MiddlewareObj<C>
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