@firebase/[email protected] imports @firebase/logger in its type declarations (index.d.ts):

import { LogCallback, LogLevelString, LogOptions } from '@firebase/logger';

However, the package.json declares this under a "dependency" field (singular) instead of the correct "dependencies" (plural):

"dependency": {
  "@firebase/logger": "0.2.6"
}

Package managers ignore the misspelled field, so @firebase/logger is never resolved as a dependency. This works in flat node_modules layouts (npm, yarn) because @firebase/logger is hoisted from other @firebase/* packages in the tree. When pnpm hoisting is disabled (hoist: false), this fails with:

error TS2307: Cannot find module '@firebase/logger' or its corresponding type declarations.

Workaround:

packageExtensions:
  "@firebase/app-types@0":
    peerDependencies:
      "@firebase/logger": "*"

Suggested fix: Rename the "dependency" field to "dependencies" in @firebase/app-types's package.json.