Error: Cannot find module 'vinyl-sourcemaps-apply' at Function.Module._resolveFilename (module.js:548:15) at Function.Module._load (module.js:475:25) at Module.require (module.js:597:17) at require (internal/module.js:11:18) at Object.<anonymous> (C:\Users\jiehui\Desktop\stuff\temp\gulp obfuscate\node_m odules\gulp-javascript-obfuscator\index.js:5:24) at Module._compile (module.js:653:30) at Object.Module._extensions..js (module.js:664:10) at Module.load (module.js:566:32) at tryModuleLoad (module.js:506:12) at Function.Module._load (module.js:498:3) 

var gulp = require('gulp'); var js_obfuscator = require('gulp-javascript-obfuscator'); gulp.task('default', function () { return gulp.src('index.js') .pipe(js_obfuscator()); }); 

console.log('hello world'); 

{ "name": "min-repro", "version": "0.0.1", "main": "index.js", "dependencies": {}, "devDependencies": { "gulp": "^4.0.2", "gulp-javascript-obfuscator": "^1.1.4" } }