rollup -c fails if rollup.config.js is a symlink

[milahu]

to reproduce:

mv rollup.config.js rollup.config.js.FILE
ln -s rollup.config.js.FILE rollup.config.js
rollup -c

Expected Behavior

read config via symlink

Actual Behavior

[!] SyntaxError: Cannot use import statement outside a module
/home/user/src/javascript/jsdom/jsdom/rollup.config.js.file:1
import commonjs from '@rollup/plugin-commonjs';
^^^^^^

SyntaxError: Cannot use import statement outside a module

env

• Rollup Version: v2.23.0
• Operating System (or Browser): linux
• Node Version (if applicable): v14.5.0

[shellscape]

Thanks for opening an issue. Citing the issue template:

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1. Using the REPL at https://rollupjs.org/repl/, or
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[milahu]

reproduction repo is here
https://github.com/milahu/rollup-bug-demo-config-symlink

symlink-ed configs are treated as commonjs files
so the es6 import x from 'y' fails

[lukastaegert]

Thanks for taking the time. With your reproduction, it was easy to debug and find the root cause, fix at #3783.