node-core-library.iprotectablemapparameters.onset.md

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Home > @rushstack/node-core-library > IProtectableMapParameters > onSet

IProtectableMapParameters.onSet property

An optional hook that will be invoked before Map.set() is performed.

Signature:

onSet?: (source: ProtectableMap<K, V>, key: K, value: V) => V;

Remarks

If this hook is provided, the function MUST return the value parameter. This provides the opportunity to modify the value before it is added to the map.