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'use strict'; const PassThrough = require('stream').PassThrough; module.exports = opts => { opts = Object.assign({}, opts); const array = opts.array; let encoding = opts.encoding; 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; };