@jaspero/ng-helpers/esm2022/decorators/on-change.decorator.mjs

[](https://github.com/semantic-release/semantic-release) [](https://circleci.

export function OnChange(callback) {
    const cachedValueKey = Symbol();
    const isFirstChangeKey = Symbol();
    return (target, key) => {
        Object.defineProperty(target, key, {
            set: function (value) {
                /**
                 * Change status of "isFirstChange"
                 */
                this[isFirstChangeKey] = this[isFirstChangeKey] === undefined;
                /**
                 *  No operation if new value is same as old value
                 */
                if (!this[isFirstChangeKey] && this[cachedValueKey] === value) {
                    return;
                }
                const oldValue = this[cachedValueKey];
                this[cachedValueKey] = value;
                const simpleChange = {
                    firstChange: this[isFirstChangeKey],
                    previousValue: oldValue,
                    currentValue: this[cachedValueKey],
                    isFirstChange: () => this[isFirstChangeKey]
                };
                callback.call(this, this[cachedValueKey], simpleChange);
            },
            get: function () {
                return this[cachedValueKey];
            }
        });
    };
}
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