WASM (browser, bundler, Node)

npm install wickra-wasm

The wickra-wasm bundle is the same Rust kernel compiled to WebAssembly via wasm-bindgen. It runs in the browser (any modern one), in bundlers (Vite / webpack / esbuild), and in Node 18+.

• Latest: wickra-wasm 0.4.5
• Bundle size: ~80 KB gzipped (JS loader + .wasm)
• Try it live: Demo page

Initialise the module once

import init, { RSI, EMA, MACD, BollingerBands, version } from 'wickra-wasm'

await init()                          // fetches the .wasm binary
console.log('wickra-wasm v' + version())

The default export is an async init() function. In Vite and other modern bundlers it resolves the WASM URL for you; in a plain <script type="module"> setup you can pass an explicit URL to init(url).

Streaming RSI in the browser

const rsi = new RSI(14)
for (const price of liveFeed) {
  const v = rsi.update(price)         // null during warmup
  if (v != null && v > 70) console.log('overbought', v)
}

Multi-output indicators

const macd = new MACD(12, 26, 9)
const out = macd.update(price)
// → { macd, signal, histogram } or null

const bb = new BollingerBands(20, 2.0)
const band = bb.update(price)
// → { upper, middle, lower, stddev } or null

Batch (Float64Array)

Every indicator class exposes batch(prices) returning a typed array. For multi-output indicators it is a flat array — e.g. MACD returns [macd0, sig0, hist0, macd1, sig1, hist1, ...] of length 3 * n.

const macd = new MACD(12, 26, 9)
const flat = macd.batch(prices)
// access column i with flat[3 * tick + i]

Building from source

If you want to ship a custom build (e.g. with --features panic-hook enabled, or scoped to fewer indicators):

wasm-pack build bindings/wasm --target web --release --features panic-hook

The resulting pkg/ directory is publishable to npm or vendored into your app directly.

More

• Quickstart-WASM (docs)
• Live demo source
• Bundle structure