source: trip-planner-front/node_modules/get-stream/buffer-stream.js@ 76712b2

'use strict';
const {PassThrough} = require('stream');

module.exports = options => {
        options = Object.assign({}, options);

        const {array} = options;
        let {encoding} = options;
        const buffer = encoding === 'buffer';
        let objectMode = false;

        if (array) {
                objectMode = !(encoding || buffer);
        } else {
                encoding = encoding || 'utf8';
        }

        if (buffer) {
                encoding = null;
        }

        let len = 0;
        const ret = [];
        const stream = new PassThrough({objectMode});

        if (encoding) {
                stream.setEncoding(encoding);
        }

        stream.on('data', chunk => {
                ret.push(chunk);

                if (objectMode) {
                        len = ret.length;
                } else {
                        len += chunk.length;
                }
        });

        stream.getBufferedValue = () => {
                if (array) {
                        return ret;
                }

                return buffer ? Buffer.concat(ret, len) : ret.join('');
        };

        stream.getBufferedLength = () => len;

        return stream;
};