You can install the regenerator-runtime library by using npm or yarn, and you can import the library in your code by using the following code: import 'regenerator-runtime/runtime';. Fix ReferenceError: RegeneratorRuntime is Not Defined It is crucial to remember that this mistake may arise for various reasons. Just add: , inside of the body in your index.html. How to Fix ReferenceError: RegeneratorRuntime is Not Defined in JavaScript? index.js require('babel-polyfill') .babelr 1) "useBuiltIns": "entry" does not load polyfills for all features, it actually removes those not needed according to the docs 2) It is recommended to use .browserlistrc (or other browserlist config options), since many other tools than just babel use those. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'errorsandanswers_com-box-3','ezslot_12',119,'0','0'])};__ez_fad_position('div-gpt-ad-errorsandanswers_com-box-3-0');I am trying to run Karma-babel-preprocessor and a straight forward ES6 generator:if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'errorsandanswers_com-medrectangle-3','ezslot_4',120,'0','0'])};__ez_fad_position('div-gpt-ad-errorsandanswers_com-medrectangle-3-0'); From this I generated my test files (ES6 => ES5) with babel:if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'errorsandanswers_com-medrectangle-4','ezslot_9',121,'0','0'])};__ez_fad_position('div-gpt-ad-errorsandanswers_com-medrectangle-4-0'); ReferenceError: regeneratorRuntime is not defined. [] Jest `regeneratorRuntime` "Stuff can break" Dan Abramov talking about react-app-rewired (deprecated for CRA > 2.0) babel-polyfill regenerator-runtime Jest Babel, used by Parcel, generates a polyfill, but to avoid this error you need to also load the regenerator-runtime runtime. Not the answer you're looking for? This is a significant improvement over the traditional callback-based approach that can quickly become difficult to read and maintain. How to Run or Call Executable (EXE) From JavaScript? Node 10.15.3/npm 6.4.1]. 3 ReferenceError: regeneratorRuntime is not defined # WebBecause this is a polyfill (which will run before your source code), we need it to be a dependency, not a devDependency. I installed @babel/plugin-transform-runtime within the app as well as regenerator-runtime globally, by the way. Webjsasyncuncaught referenceerror: regeneratorruntime is not defined_- 2019-09-29 : regenerator async. regeneratorRuntime is not defined Here use babel-plugin-transform-runtime inOrder to support async/await referenceerror: activexobject is not defined. I can't get it to work, and Webpack doesn't seem to allow this snippet in any kind of way. Your email address will not be published. https://github.com/browserslist/browserslist, Next App - ReferenceError: regeneratorRuntime is not defined, https://github.com/browserslist/browserslist#browserslist-, DX-1516: Add Babel config and require Regenerator runtime, "ReferenceError: regeneratorRuntime is not defined" in v4, feat(examples) created website example with geospatial loaders, ReferenceError: regeneratorRuntime is not defined, Netlify deploy error ("SyntaxError: Unexpected token '. Once you have installed the package, import the regenerator-runtime module at the top of your JavaScript file before using async/await functions. And finally you need to import @bable/polyfill in your mainJS (App.js) file like: import "@babel/polyfill"; Just add: