@bigmi/core
Version:
TypeScript library for Bitcoin apps.
48 lines • 1.56 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.cleanupCache = exports.listenersCache = void 0;
exports.observe = observe;
exports.listenersCache = new Map();
exports.cleanupCache = new Map();
let callbackCount = 0;
function observe(observerId, callbacks, fn) {
const callbackId = ++callbackCount;
const getListeners = () => exports.listenersCache.get(observerId) || [];
const unsubscribe = () => {
const listeners = getListeners();
exports.listenersCache.set(observerId, listeners.filter((cb) => cb.id !== callbackId));
};
const unwatch = () => {
const cleanup = exports.cleanupCache.get(observerId);
if (getListeners().length === 1 && cleanup) {
cleanup();
}
unsubscribe();
};
const listeners = getListeners();
exports.listenersCache.set(observerId, [
...listeners,
{ id: callbackId, fns: callbacks },
]);
if (listeners && listeners.length > 0) {
return unwatch;
}
const emit = {};
for (const key in callbacks) {
emit[key] = ((...args) => {
const listeners = getListeners();
if (listeners.length === 0) {
return;
}
for (const listener of listeners) {
listener.fns[key]?.(...args);
}
});
}
const cleanup = fn(emit);
if (typeof cleanup === 'function') {
exports.cleanupCache.set(observerId, cleanup);
}
return unwatch;
}
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