error.sh

path.js:8
    throw new TypeError('Path must be a string. Received ' +
    ^

TypeError: Path must be a string. Received undefined

gulpfile.js

var gulp = require('gulp'),
    browserify = require('browserify');
    
gulp.task('compile-client', function() {
  browserify()
    .add('./client.js')
    .bundle()
    .pipe(gulp.dest('./public'));
});