Getting weird error on running any yarn command

[mariappan-subramanian]

Getting this error on running any yarn command, even on yarn -v

Invariant Violation: Expected a key
    at invariant (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:2314:15)
    at Parser.parse (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:64434:55)
    at parse (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:64581:21)
    at module.exports.exports.default (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:64143:96)
    at loadRcFile (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:56986:58)
    at /usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:56960:14
    at /usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:101468:14
    at Array.map (<anonymous>)
    at parseRcPaths (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:101466:78)
    at Object.findRc (/usr/local/Cellar/yarn/1.22.15/libexec/lib/cli.js:101480:10) 

Tried uninstalling and reinstalling yarn, node etc. Nothing really helped. Can someone help me with this?
Tried clearing yarn cache

OS - macOs
Installed yarn via homebrew and it's upto date