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feat: add isNothing() #989

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feat: add isNothing() #989

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8 changes: 7 additions & 1 deletion src/utils/common.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,9 @@ import {
ImmerState,
hasMap,
Archtype,
die
die,
NOTHING,
Nothing
} from "../internal"

/** Returns true if the given value is an Immer draft */
Expand Down Expand Up @@ -215,3 +217,7 @@ export function isFrozen(obj: any): boolean {
// See #600, IE dies on non-objects in Object.isFrozen
return Object.isFrozen(obj)
}

export function isNothing(value: unknown): value is Nothing {
return value === NOTHING
}