@lobechat/file-loaders

@lobechat/file-loaders is a toolkit within the LobeHub project, specifically designed for loading various types of files from local file paths and converting their content into standardized Document object arrays.

Its primary purpose is to provide a unified interface for reading different file formats, extracting their core text content, and preparing them for subsequent processing (such as file preview, content extraction, or serving as knowledge base data sources in LobeHub).

✨ Features

• Unified Interface: Provides loadFile(filePath: string) function as the core entry point.
• Automatic Type Detection: Automatically selects appropriate loading methods based on file extensions.
• Extensive Format Support:
  • Plain Text: .txt, .csv, .md, .json, .xml, .yaml, .html and various code and configuration file formats.
  • PDF: .pdf files.
  • Word: .docx files.
  • Excel: .xlsx, .xls files, with each worksheet as a Page.
  • PowerPoint: .pptx files, with each slide as a Page.
• Standardized Output: Always returns Promise<Document>. A Document object represents a loaded file, containing an array of Page objects that represent the logical units of the file (pages, slides, worksheets, text blocks, etc.).
• Hierarchical Structure: Uses a structure where Document contains Page[], better reflecting the original organization of the file.
• Rich Metadata: Provides detailed metadata at both Document and Page levels, including file information, content statistics, and structural information.

Core Data Structures

The loadFile function returns a FileDocument object containing file-level information and all its logical pages/blocks (DocumentPage).

FileDocument Interface

Field	Type	Description
content	string	File content (aggregated content)
createdTime	Date	File creation timestamp.
fileType	string	File type or extension.
filename	string	Original filename.
metadata	object	File-level metadata.
metadata.author	string?	Document author (if available).
metadata.error	string?	Error information if the entire file loading failed.
metadata.title	string?	Document title (if available).
...	any	Other file-level metadata.
modifiedTime	Date	File last modified timestamp.
pages	DocumentPage[]?	Array containing all logical pages/blocks in the document (optional).
source	string	Full path of the original file.
totalCharCount	number	Total character count of the entire document (sum of all DocumentPage charCount).
totalLineCount	number	Total line count of the entire document (sum of all DocumentPage lineCount).

DocumentPage Interface

Field	Type	Description
charCount	number	Character count of this page/block content.
lineCount	number	Line count of this page/block content.
metadata	object	Metadata related to this page/block.
metadata.chunkIndex	number?	Current chunk index if split into chunks.
metadata.error	string?	Error occurred when processing this page/block.
metadata.lineNumberEnd	number?	End line number in the original file.
metadata.lineNumberStart	number?	Start line number in the original file.
metadata.pageNumber	number?	Page number (applicable to PDF, DOCX).
metadata.sectionTitle	string?	Related section title.
metadata.sheetName	string?	Worksheet name (applicable to XLSX).
metadata.slideNumber	number?	Slide number (applicable to PPTX).
metadata.totalChunks	number?	Total chunks if split into chunks.
...	any	Other page/block-specific metadata.
pageContent	string	Core text content of this page/block.

🤝 Contribution

File formats and parsing requirements are constantly evolving. We welcome community contributions to expand format support and improve parsing accuracy. You can participate in improvements through:

How to Contribute

1. New File Format Support: Add support for additional file types
2. Parser Improvements: Enhance existing parsers for better content extraction
3. Metadata Enhancement: Improve metadata extraction capabilities
4. Performance Optimization: Optimize file loading and processing performance

Contribution Process

1. Fork the LobeHub repository
2. Add new format support or improve existing parsers
3. Submit a Pull Request describing:

• New file formats supported or improvements made
• Testing with various file samples
• Performance impact analysis
• Documentation updates

📌 Note

This is an internal module of LobeHub ("private": true), designed specifically for LobeHub and not published as a standalone package.

If you're interested in our project, feel free to check it out, star it, or contribute code on GitHub!