I created a project with vue-cli 4.1.1, and after running yarn serve, i got the following error
Error: [BABEL] C:\\dev\\vuestudy\\src\\main.js: Cannot find m
This is a bug with core-js-compat v3.4.6, but already the fix has gone with v3.4.7. See https://github.com/zloirock/core-js/issues/712 for more detail.