How to solve pnpm not being installed with npm

solution.md

If you get an error like this:

C:\Program Files\nodejs\node_modules\corepack\dist\lib\corepack.cjs:21535
  if (key == null || signature == null) throw new Error(`Cannot find matching keyid: ${JSON.stringify({ signatures, keys })}`);
                                              ^

Or

bash: pnpm: command not found

You can solve it by running:

corepack prepare [email protected] --activate