core

@mettascript/core

The MeTTa (OpenCog Hyperon) interpreter in pure TypeScript: atoms, spaces, the type system, pattern matching, evaluation, and the standard library. No native addons and no required WASM. Runs in any JavaScript runtime (browser, Node, Deno, Bun, edge).

Part of MeTTaScript.

Install

npm install @mettascript/core

Usage

import { runProgram, format } from "@mettascript/core";

const results = runProgram(`
  (= (fact $n) (unify $n 0 1 (* $n (fact (- $n 1)))))
  !(fact 5)
`);

for (const { query, results: rs } of results) {
  console.log(format(query), "=>", rs.map(format));
}
// (fact 5) => [ '120' ]

runProgram parses the source, adds every non-bang atom to the knowledge base, evaluates each !-query, and returns one result group per query. For a higher-level class API modeled on Python's hyperon, see @mettascript/hyperon.

The experimental line adds a pull-based streaming grounded-operation protocol on the experimental npm tag; see Experimental features.

License

MIT.