42 lines
941 B
TypeScript
42 lines
941 B
TypeScript
export class Reactive {
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listeners: any;
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contents: any;
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constructor(obj: Record<string, unknown>) {
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this.contents = obj;
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this.listeners = {};
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this.makeReactive(obj);
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}
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makeReactive(obj: Record<string, unknown>) {
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Object.keys(obj).forEach(prop => this.makePropReactive(obj, prop));
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}
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makePropReactive(obj: Record<string, unknown>, key: string) {
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let value = obj[key];
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// Gotta be careful with this here
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// eslint-disable-next-line @typescript-eslint/no-this-alias
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const that = this;
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Object.defineProperty(obj, key, {
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get() {
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return value;
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},
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set(newValue) {
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value = newValue;
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that.notify(key);
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}
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});
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}
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listen(prop: string, handler: any) {
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if (!this.listeners[prop]) this.listeners[prop] = [];
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this.listeners[prop].push(handler);
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}
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notify(prop: string) {
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if (!this.listeners[prop]) return;
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this.listeners[prop].forEach((listener: any) => listener(this.contents[prop]));
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}
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} |