Current File : /home/vacivi36/.trash/vacivitta/node_modules/motion-dom/dist/es/value/transform-value.mjs
import { collectMotionValues, motionValue } from './index.mjs';
import { subscribeValue } from './subscribe-value.mjs';
/**
* Create a `MotionValue` that transforms the output of other `MotionValue`s by
* passing their latest values through a transform function.
*
* Whenever a `MotionValue` referred to in the provided function is updated,
* it will be re-evaluated.
*
* ```jsx
* const x = motionValue(0)
* const y = transformValue(() => x.get() * 2) // double x
* ```
*
* @param transformer - A transform function. This function must be pure with no side-effects or conditional statements.
* @returns `MotionValue`
*
* @public
*/
function transformValue(transform) {
const collectedValues = [];
/**
* Open session of collectMotionValues. Any MotionValue that calls get()
* inside transform will be saved into this array.
*/
collectMotionValues.current = collectedValues;
const initialValue = transform();
collectMotionValues.current = undefined;
const value = motionValue(initialValue);
subscribeValue(collectedValues, value, transform);
return value;
}
export { transformValue };
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