When I run the \'webpack\' command, I get this error:
ERROR in ./js/main.js Module not found: Error: Can\'t resolve \'jquery\' in \'...\\js\' @ ./js/main.js 3:0-16 4
The handlebars has nothing to do with it. The problem is that you changed resolve.modules to [path.join(__dirname, "js/helpers")]. So webpack will only look in js/helpers for any module, but jquery and other dependencies from npm are in node_modules. The default value of resolve.modules is ["node_modules"]. You also need to add node_modules to keep the regular module resolution.
resolve: {
modules: [
path.join(__dirname, "js/helpers"),
"node_modules"
]
},