Improving TypeScript Code with Combinators for Credential Verification

Ref.get(this.state).pipe(
  Effect.flatMap((state) => state.findCredentialsByEmail(email)),
  Effect.flatMap((secure) =>
    // I am not a fan of this bit 
    Effect.if(this.match(password, secure.password), {
      onTrue: this.findByEmail(email),
      onFalse: new Credentials.NotRecognised(),
    }),
  ),
)