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The return type of the produce method will have an additional undefined聽#1003
Description
Activity
remove the default assignment and it will work.
state = {}will inner state toRecord<string,string> | undefined.type InferCurriedFromRecipe< Recipe, UsePatches extends boolean > = Recipe extends (draft: infer DraftState, ...args: infer RestArgs) => any // verify return type ? ReturnType<Recipe> extends ValidRecipeReturnTypePossiblyPromise<DraftState> ? ( base: Immutable<DraftState>, ...args: RestArgs ) => PromisifyReturnIfNeeded<DraftState, Recipe, UsePatches> // N.b. we return mutable draftstate, in case the recipe's first arg isn't read only, and that isn't expected as output either : never // incorrect return type : never // not a function
@mweststrate maybe produce function should explicitly return draft to avoid this situation?
recipes should not use a default argument, as they are never seen by
produce.producewould indeed in such a case indeed return undefined, so the inferred type is correct.
馃檵鈥嶁檪 Question
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In the above code, I expect the type of the func to be
Record<string, string>, but the actual type check returnsRecord<string, string> | undefined, how can I avoid the undefined?This problem only occurs in 9.x versions
Link to repro
https://codesandbox.io/s/immer-sandbox-forked-n1okz2?file=/src/index.ts
Environment
We only accept questions against the latest Immer version.
setUseProxies(true)setUseProxies(false)(ES5 only)