1/* eslint-disable node-core/require-common-first, node-core/required-modules */ 2'use strict'; 3 4// Hijack stdout and stderr 5const stdWrite = {}; 6function hijackStdWritable(name, listener) { 7 const stream = process[name]; 8 const _write = stdWrite[name] = stream.write; 9 10 stream.writeTimes = 0; 11 stream.write = function(data, callback) { 12 try { 13 listener(data); 14 } catch (e) { 15 process.nextTick(() => { throw e; }); 16 } 17 18 _write.call(stream, data, callback); 19 stream.writeTimes++; 20 }; 21} 22 23function restoreWritable(name) { 24 process[name].write = stdWrite[name]; 25 delete process[name].writeTimes; 26} 27 28module.exports = { 29 hijackStdout: hijackStdWritable.bind(null, 'stdout'), 30 hijackStderr: hijackStdWritable.bind(null, 'stderr'), 31 restoreStdout: restoreWritable.bind(null, 'stdout'), 32 restoreStderr: restoreWritable.bind(null, 'stderr') 33}; 34