This directory houses the assets for compiling a WebAssembly binary for Vector Remap Language.

• Install wasm-pack
• Install the wasm32-unknown-unknown target for Rust

To build a Wasm binary runnable in the browser:

wasm-pack build --target web

Other targets are available as well.

That outputs a variety of files in pkg.

This Wasm module offers just one function, resolve, which takes a single JSON object with two fields:

• program is the VRL input program (string)
• event is the VRL event that you want to transform (JSON object)

Here's an example usage of the binary from JavaScript:

import { resolve } from 'vrl-wasm.js';

const program = `.name = "Lee Benson"`;

const event = {
  game: "GraphQL"
};

const input = {
  program: program,
  event: event
};

const res = resolve(input);

const expected = {
  // Value returned by the last expression in the program
  output: "\"Lee Benson\"",
  // The transformed event
  result: {
    name: "Lee Benson",
    game: "GraphQL"
  }
}

To run the tests:

wasm-pack test --node