Accepts a mapping of registry URLs and returns a mapping with the same URLs but normalized
pnpm add @pnpm/normalize-registries
import normalizeRegistries from '@pnpm/normalize-registries'
normalizeRegistries({
'default': 'https://registry.npmjs.org',
'@foo': 'https://example.com',
})
// will return the same object but the URLs will end with a /