Here are the problems that are easy to encounter in development.
pnpm i
# get dist
pnpm build
cd dist/element-plus
# set cur element-plus to global `node_modules`
pnpm link --global
# for esm we also need link element-plus for dist
pnpm link --global element-plus
# go to your project, link to `element-plus`
cd your-project
pnpm link --global element-plus
More info see pnpm link.