Angular4.x Module not found: Error: Can't resolve 'classlist.js'
remove the current package,
npm uninstall classlist.js --savethen run
npm cache verifyafterwards run
npm install classlist.js --save-exact
You're importing a polyfill that is not included by default. You have to install it as a dependency first. How to do that is in a comment on the same line that imports it:
// Run `npm install --save classlist.js`.The same goes for the web-animations-js polyfill if you haven't done so already.
/** IE9, IE10 and IE11 requires all of the following polyfills. **/ import 'core-js/es6/symbol'; import 'core-js/es6/object'; import 'core-js/es6/function'; import 'core-js/es6/parse-int'; import 'core-js/es6/parse-float'; import 'core-js/es6/number'; import 'core-js/es6/math'; import 'core-js/es6/string'; import 'core-js/es6/date'; import 'core-js/es6/array'; import 'core-js/es6/regexp'; import 'core-js/es6/map'; import 'core-js/es6/weak-map'; import 'core-js/es6/set';