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/** Define a [lazily evaluated](https://en.wikipedia.org/wiki/Lazy_evaluation) property on an object.
@param object - Object to add property to. @param propertyName - Name of the property to add. @param fn - Called the first time `propertyName` is accessed.
@example ```
import defineLazyProp = require('define-lazy-prop');
const unicorn = { // …
};
defineLazyProp(unicorn, 'rainbow', () => expensiveComputation());
app.on('user-action', () => { doSomething(unicorn.rainbow); }); ```
*/ declare function defineLazyProp< ObjectType extends {[key: string]: unknown}, PropertyNameType extends string, PropertyValueType >( object: ObjectType, propertyName: PropertyNameType, fn: () => PropertyValueType ): ObjectType & {[K in PropertyNameType]: PropertyValueType};
export = defineLazyProp;
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