Handling Errors from Multiple Implementations in Effect Typescript

import { getParsedFile, LlamaIndexClient } from 'src/common/llamaindex.wrapper';

// Custom tagged error for PDF parsing
export class DocumentParserError extends Data.TaggedError(
  'DocumentParserError',
)<{
  readonly message: string;
  readonly cause?: unknown;
}> {}

export class DocumentParser extends Effect.Tag('DocumentParser')<
  DocumentParser,
  {
    readonly getParsedFile: (payload: {
      file: any;
      filename: string;
    }) => Effect.Effect<string, DocumentParserError>;
  }
>() {
  static LlamaIndex = Layer.effect(
    this,
    Effect.succeed({
      getParsedFile: (payload: { file: Blob; filename: string }) =>
        getParsedFile(payload).pipe(
          Effect.provide(LlamaIndexClient.Default),
          Effect.mapError(
            (error) =>
              new DocumentParserError({
                message:
                  error instanceof Error
                    ? error.message
                    : 'Unknown error occurred during document parsing',
                cause: error,
              }),
          ),
        ),
    }),
  );

  static Mock = Layer.effect(
    this,
    Effect.succeed({
      getParsedFile: (payload: { file: any; filename: string }) =>
        Effect.succeed(`Mock parsed content for ${payload.filename}`),
    }),
  );
}