zephyr-events/dist/index.js

Ultra-fast ES2023 event emitter with 889B bundle size and race-condition safety

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = zephyrEvents;
function zephyrEvents(all) {
    all ??= new Map();
    const handlerSets = new Map();
    const getHandlerSet = (type) => {
        let handlers = handlerSets.get(type);
        if (!handlers) {
            handlers = new Set();
            handlerSets.set(type, handlers);
            all.set(type, []);
        }
        return handlers;
    };
    const syncMap = (type) => {
        const handlers = handlerSets.get(type);
        if (handlers) {
            all.set(type, [...handlers]);
        }
    };
    return {
        all,
        on(type, handler) {
            const handlers = getHandlerSet(type);
            handlers.add(handler);
            syncMap(type);
            return () => {
                handlers.delete(handler);
                syncMap(type);
            };
        },
        off(type, handler) {
            const handlers = handlerSets.get(type);
            if (!handlers)
                return;
            handler ? handlers.delete(handler) : handlers.clear();
            syncMap(type);
        },
        emit(type, evt) {
            const handlers = handlerSets.get(type);
            if (handlers?.size) {
                for (const handler of [...handlers]) {
                    handler(evt);
                }
            }
            const wildcards = handlerSets.get('*');
            if (wildcards?.size) {
                for (const handler of [...wildcards]) {
                    handler(type, evt);
                }
            }
        }
    };
}