watson-developer-cloud/lib/to-promise.js

Client library to use the IBM Watson Services and AlchemyAPI

"use strict";
/**
 * Helper method that can be bound to a stream - it sets the output to utf-8, captures all of the results, and returns a promise that resolves to the final text
 * Essentially a smaller version of concat-stream wrapped in a promise
 *
 * @param {Stream} [stream] optional stream param for when not bound to an existing stream instance
 * @return {Promise}
 */
function promise(stream) {
    stream = stream || this;
    return new Promise(function (resolve, reject) {
        var results = [];
        stream
            .on('data', function (result) {
            results.push(result);
        })
            .on('end', function () {
            resolve(Buffer.isBuffer(results[0])
                ? Buffer.concat(results).toString()
                : results);
        })
            .on('error', reject);
    });
}
module.exports = promise;
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