NativR

Write R. Run JavaScript.

Experimental: NativR implements a small, explicitly documented R-compatible subset. It is not GNU R and does not run arbitrary R packages.

NativR is an independent, browser-native analytics runtime written in TypeScript. It parses supported R source with Tree-sitter, normalizes that syntax into a NativR-owned AST, and interprets it locally with explicit vector semantics. The default public API runs in a Web Worker and performs no network access during evaluation.

pnpm add @nativr/nativr

import { createR } from "@nativr/nativr";

const r = await createR();
const result = await r.eval(`
  x <- c(1, 2, 3, 4, 5)
  mean(x)
`);
console.log(result); // 3
await r.dispose();

The current milestone supports atomic literals, assignments, arithmetic vectorization and recycling, lexical closures with lazy arguments, and the builtins c, length, sum, mean, sqrt, abs, is.na, and is.nan. See the compatibility contract for exact boundaries.

Source releases are managed with Changesets. npm publication uses GitHub Actions trusted publishing without a long-lived registry token; see the release guide.

Development

Use Node 24 and pnpm 11.

If the checkout is inside Dropbox, OneDrive, or another synchronized folder, first follow the machine-local dependency setup so Git synchronizes source while dependencies and test artifacts remain outside the project tree.

pnpm install
pnpm grammar:build
pnpm check
pnpm dev

The repository is a pnpm workspace:

R source -> @nativr/parser -> normalized @nativr/ast
                                  |
                                  v
                  @nativr/runtime <- @nativr/base
                                  |
                                  v
                  @nativr/nativr Worker API -> playground

NativR intentionally does not implement package installation, data frames, graphics, S3/S4, dynamic evaluation, filesystem access, or network access. Planned directions are documented in the roadmap.

This Apache-2.0 project follows an independent clean-room policy. It is not affiliated with or endorsed by the R Foundation, Posit, OpenAI, or R package authors. No official R branding is used.

License

Apache License 2.0. Third-party notices are in NOTICE.