This will add the replaceAll method to the string prototype, so you can use it exactly as you would with ECMA-262 and all need to be done after support was added to your env is to remove the require at the top!
All you have to do is to require the package on the top of your file after you installed the package (npm i replaceAll-Shim),
require('replaceAll-Shim');
then you can use replaceAll method as you would if ECMA-262 was supported in your environment as the method will be added to the String prototype:
'aabbcc'.replaceAll('b', '.');
// 'aa..cc'