'`pnpm install` Usage Error: This project is configured to use yarn

I am trying to migrate from yarn to pnpm. I ran pnpm install. It instantly failed and printed to the console:

Usage Error: This project is configured to use yarn

$ pnpm ...

I tried removing (renaming actually) yarn.lock and node_modules but to no avail. How to solve this?

Solution 1:^[1]

I figured out that it's because of:

{
 // ...
 "packageManager": "yarn@..."
 // ...
}

removing (or changing it to pnpm) would solve the issue. Additionally, yarn.lock existence doesn't have do with issue.

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Solution	Source
Solution 1