@vivantel/virage-core

@vivantel/virage-core

Pipeline orchestrator, provider interfaces, and CLI for Git-aware RAG indexing.

Installation

npm install @vivantel/virage-core

Quick start

npx virage init    # generate virage.config.json interactively
npx virage         # run the pipeline

What it does

Four pipeline stages run in sequence:

1. GitTracker — finds files matching your chunker patterns, applies exclude glob filters, and detects changes via commit hashes
2. ChunkProcessor — splits each file into Chunk[] using your configured chunker plugin (runs files in parallel, concurrency = CPU core count by default)
3. EmbedderProcessor — embeds chunk.denseText into chunk.denseVector (skips unchanged content via denseTextHash); detects model changes and auto-invalidates stale embeddings
4. Uploader — syncs the vector store: deletes stale documents, upserts new ones

Four-artifact chunk model

Every chunk produced by a FileChunker plugin carries four text artifacts:

Field	Purpose
denseText	Breadcrumb prefix + full body — sent to the embedding model
denseVector	Embedding of denseText — stored in vector index for ANN search
sparseText	Raw body without breadcrumb — used for BM25 / FTS lexical search
contextText	Full body + boundary padding from neighbouring windows — passed to LLM
denseTextHash	sha256(denseText).slice(0,16) — 16-char hex primary cache key

interface Chunk {
  denseText: string;
  sparseText: string;
  contextText: string;
  denseTextHash: string;
  metadata: ChunkMeta;
  sourceFile: string;
  commitHash: string;
}

Config format

Configuration lives in virage.config.json. The chunking section groups chunker definitions and global file exclusions:

{
  "chunking": {
    "exclude": ["**/vendor/**", "**/*.min.js", "**/dist/**"],
    "chunkers": [
      {
        "patterns": ["**/*.md"],
        "plugin": "@vivantel/virage-chunker-ce-md",
        "strategyOptions": { "maxTokens": 512, "overlap": 0.15 }
      },
      {
        "patterns": ["src/**/*.ts", "src/**/*.tsx"],
        "plugin": "@vivantel/virage-code-chunk-chunker",
        "strategyOptions": { "maxTokens": 512 }
      }
    ]
  }
}

chunking.exclude accepts glob patterns (using minimatch semantics). Files matching any pattern are skipped at both the scanning and chunking stages. virage init seeds this list with ecosystem-specific defaults for Node.js, .NET, Java, Go, and C/C++.

Provider interfaces

Implement these three interfaces to integrate any backend:

FileChunker

interface FileChunker {
  name: string;
  version: string;        // semver — used to build sparseTextId and contextTextHash
  patterns: string[];
  sparseTextId: string;   // stable fingerprint for session-level sparse cache
  contextTextHash: string; // stable fingerprint for session-level context cache
  chunk(filePath: string, commitHash: string): Promise<Chunk[]>;
  canProcess?(filePath: string): Promise<boolean>;
}

All chunker plugins are external npm packages. Built-in strategies have been removed. Use @vivantel/virage-code-chunk-chunker for source code or one of the CE/EE chunker packages for documents.

EmbeddingProvider

interface EmbeddingProvider {
  name: string;
  dimensions: number;
  model?: string; // used for cache invalidation
  embed(text: string): Promise<number[]>;
  embedBatch?(texts: string[]): Promise<number[][]>;
}

VectorStore

interface VectorStore {
  name: string;
  initialize(): Promise<void>;
  upsert(docs: VectorDocument[]): Promise<void>;
  deleteBySourceFile(files: string[]): Promise<void>;
  getCurrentState(): Promise<Map<string, string>>;
  search(embedding: number[], topK: number): Promise<VectorSearchResult[]>;
}

Chunk utility helpers

import { makeDenseText, makeSparseText, computeDenseTextHash } from "@vivantel/virage-core";

// Build the denseText string
const denseText = makeDenseText(["Chapter 1", "Section 2"], "This is the body.");
// → "Chapter 1 › Section 2. This is the body."

// Compute the 16-char hex cache key
const hash = computeDenseTextHash(denseText);
// → "a3f7c2e1b4d90581"

Caching behaviour

• Per-chunk cache: embedder checks denseTextHash before calling the embedding model. If the hash is already in the SQLite chunks table, the existing denseVector is reused.
• Session-level cache: sparseTextId and contextTextHash are stored in the meta table. If unchanged between runs, the FTS rebuild and context refresh are skipped respectively.
• Schema migration: if the chunks table has a content column (old schema), the table is dropped and a warning is logged. Re-index after upgrading.

License

MIT