RAGLite

RAGLite is a minimal, TypeScript-first Retrieval-Augmented Generation (RAG) pipeline. It's designed for simplicity, extensibility, and performance, supporting PDF and DOCX ingestion, local embeddings, and fast vector search using SQLite/LibSQL.

Features

• Simple API: to load and search for documents.
• Document Ingestion: Load PDFs and DOCX files out of the box.
• Local Embeddings: Uses local embedding model from Hugging Face.
• Fast Vector Search: Backed by SQLite/LibSQL for efficient similarity search.
• Extensible: Advanced users can use or extend individual components.

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Installation

npm install raglite

Quick Start

Basic Usage

Add documents to the data store:

import { load, search } from "raglite";

// Load a document from a file path
const records = await load("path/to/document.pdf");

records; // The chunked records created from the document
records[0].content; // The content of the document chunk
records[0].metadata; // The metadata of the document chunk
records[0].vector; // The vector of the document chunk
records[0].id; // The database id of the document chunk

// Load a document from a URL
await load("https://example.com/path/to/document.docx");

// Load a document from text
await load("Hello, world!");

// Include metadata with the document
await load("Hello, world!", {
  source: "https://example.com/path/to/document.docx",
});

Search for relevant documents:

const results = await search("What is retrieval-augmented generation?");

console.log(results); // [{ content: "...", metadata: { source: "..." } }, ...]

Environment Variables

You can customize the pipeline by passing in your own components.

Variable	Default	Description
DATABASE_URL	file:data/ragpipe.db	The URL of the SQLite/LibSQL database
TABLE_NAME	embeddings	The name of the table to store the embeddings
DIMENSIONS	384	The dimensions of the embeddings
MODEL	sentence-transformers/all-MiniLM-L12-v2	The model to use for embedding
CHUNK_SIZE	200	The maximum number of words to embed per chunk
OVERLAP	0	The number of words to overlap between chunks

Advanced Usage

Customizing the Pipeline

You can customize the pipeline by passing in your own components.

import {
  Pipeline,
  UrlLoader,
  FileLoader,
  PdfLoader,
  DocxLoader,
  EmbeddingLoader,
  DataStoreLoader,
} from "raglite";

// Create a writer pipeline
const writer = new Pipeline([
  new UrlLoader({
    headers: {
      Authorization: `Bearer ${process.env.TOKEN}`,
    },
  }), // add fetch request options
  new FileLoader(),
  new PdfLoader(),
  new DocxLoader(),
  new EmbeddingLoader({
    model: "sentence-transformers/all-MiniLM-L6-v2",
    chunkSize: 200,
    overlap: 10,
  }), // customize the embedding model
  new DataStoreLoader({
    databaseUrl: "path/to/database.db",
    tableName: "documents",
    dimensions: 384,
  }), // customize the data store
]);

const records = await writer.load("path/to/document.pdf");

// Create a reader pipeline
const reader = new Pipeline([
  new EmbeddingLoader(),
  new DataStoreLoader({ search: true }),
]);

const results = await reader.search("What is retrieval-augmented generation?");

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Requirements

• Node.js >= 18 (recommended: >= 20)
• SQLite/LibSQL database (local file or remote)

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Development & Testing

• Run tests: pnpm test or npm test
• Build: pnpm build or npm run build

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License

MIT

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Contributing

Contributions, issues, and feature requests are welcome! Please open an issue or PR.