32 lines
1.3 KiB
TypeScript
32 lines
1.3 KiB
TypeScript
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const es6Promisify = require('es6-promisify');
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/**
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* Return a promise that resolves once the given event emitter emits the specified event
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*
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* @param {NodeJS.EventEmitter} emitter - The event emitter to watch
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* @param {string} event - The event to watch
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* @returns {Promise<{}>} - The promise that resolves once the given emitter emits the specified evnet
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*/
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export function once(emitter: NodeJS.EventEmitter, event: string) {
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return new Promise((resolve) => {
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emitter.once(event, result => {
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resolve(result);
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});
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});
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}
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/**
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* Transform callback-based function -- func(arg1, arg2 .. argN, callback) -- into
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* an ES6-compatible Promise. Promisify provides a default callback of the form (error, result)
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* and rejects when `error` is truthy. You can also supply settings object as the second argument.
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*
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* @param {function} original - The function to promisify
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* @param {object} [settings] - Settings object
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* @param {object} settings.thisArg - A `this` context to use. If not set, assume `settings` _is_ `thisArg`
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* @param {bool} settings.multiArgs - Should multiple arguments be returned as an array?
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* @returns {function} A promisified version of `original`
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*/
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export function promisify(original: Function, settings?: Object): Function {
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return es6Promisify(original, settings);
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};
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