Yarn v1 invalid switch

[szepeviktor]

Describe the bug:

Many workflows contain yarn install --immutable
Yarn v1 is used.
There is no --immutable switch https://classic.yarnpkg.com/en/docs/cli/install
But there is in v2 https://yarnpkg.com/cli/install

I think some read the v2 docs ...

Expected behavior:

yarn install --non-interactive --pure-lockfile