@remotion/renderer
Version:
Render Remotion videos using Node.js or Bun
50 lines (49 loc) • 1.73 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = mitt;
/**
* Mitt: Tiny (~200b) functional event emitter / pubsub.
* @name mitt
* @returns {Mitt}
*/
function mitt(all) {
all = all || new Map();
return {
/**
* A Map of event names to registered handler functions.
*/
all,
/**
* Register an event handler for the given type.
* @param {string|symbol} type Type of event to listen for, or `"*"` for all events
* @param {Function} handler Function to call in response to given event
* @memberOf mitt
*/
on: (type, handler) => {
const handlers = all === null || all === void 0 ? void 0 : all.get(type);
const added = handlers === null || handlers === void 0 ? void 0 : handlers.push(handler);
if (!added) {
all === null || all === void 0 ? void 0 : all.set(type, [handler]);
}
},
off: (type, handler) => {
const handlers = all === null || all === void 0 ? void 0 : all.get(type);
if (handlers) {
// eslint-disable-next-line no-bitwise
handlers.splice(handlers.indexOf(handler) >>> 0, 1);
}
},
emit: (type, evt) => {
((all === null || all === void 0 ? void 0 : all.get(type)) || [])
.slice()
.forEach((handler) => {
handler(evt);
});
((all === null || all === void 0 ? void 0 : all.get('*')) || [])
.slice()
.forEach((handler) => {
handler(type, evt);
});
},
};
}