Type/docs mismatch: receivedRedirectUri docs say string|null|undefined but type only permits string|undefined

[Nexory]

Summary

README.md line 87 documents receivedRedirectUri as string | null | undefined, but src/types/index.ts:156 declares the type as string | undefined (no null). A consumer following the README and passing null will get a TypeScript error.

What I observed

README.md:87:

| receivedRedirectUri | string \| null \| undefined | ...

src/types/index.ts:156:

receivedRedirectUri?: string;

The type only permits string | undefined.

Impact

Consumers reading the README and explicitly passing null (e.g., for an "OAuth not yet completed" branch) hit a TypeScript compile error. Either the type needs to widen to accept null, or the README needs to drop | null.

Suggested fix

Pick one of:

1. Widen the type to match README:

   - receivedRedirectUri?: string;
   + receivedRedirectUri?: string | null;

2. Or update README to match the type by removing | null.

Option 2 is the minimal, low-risk path unless the Plaid Link SDK actually accepts null semantically at runtime.