next
Version:
The React Framework
70 lines (68 loc) • 1.68 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
0 && (module.exports = {
emit: null,
off: null,
on: null
});
function _export(target, all) {
for(var name in all)Object.defineProperty(target, name, {
enumerable: true,
get: all[name]
});
}
_export(exports, {
emit: function() {
return emit;
},
off: function() {
return off;
},
on: function() {
return on;
}
});
let handlers = new Set();
let queue = [];
function drain() {
// Draining should never happen synchronously in case multiple handlers are
// registered.
setTimeout(function() {
while(// Until we are out of events:
Boolean(queue.length) && // Or, if all handlers removed themselves as a result of handling the
// event(s)
Boolean(handlers.size)){
const ev = queue.shift();
handlers.forEach((handler)=>handler(ev));
}
}, 1);
}
function emit(ev) {
queue.push(Object.freeze({
...ev
}));
drain();
}
function on(fn) {
if (handlers.has(fn)) {
return false;
}
handlers.add(fn);
drain();
return true;
}
function off(fn) {
if (handlers.has(fn)) {
handlers.delete(fn);
return true;
}
return false;
}
if ((typeof exports.default === 'function' || (typeof exports.default === 'object' && exports.default !== null)) && typeof exports.default.__esModule === 'undefined') {
Object.defineProperty(exports.default, '__esModule', { value: true });
Object.assign(exports.default, exports);
module.exports = exports.default;
}
//# sourceMappingURL=bus.js.map