feat(lazer): add js example (#35)

* feat(lazer): add js example

* chore: set up CI

.github/workflows/ci-lazer-js.yml

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+name: "Lazer JS Test Suite"
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lazer-js-test-suite:
+    name: Lazer JS Test Suite
+    runs-on: ubuntu-22.04
+    defaults:
+      run:
+        working-directory: lazer/js
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: 18
+    - run: npm install --global [email protected]
+    - run: pnpm install --frozen-lockfile
+    - run: pnpm run test

lazer/js/.gitignore

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+tsconfig.tsbuildinfo
+dist

lazer/js/package.json

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+{
+  "name": "pyth-lazer-js-example",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "start": "node --loader ts-node/esm src/index.js",
+    "test": "pnpm run test:format && pnpm run build:cjs && pnpm run build:esm",
+    "build:cjs": "tsc --project tsconfig.json --verbatimModuleSyntax false --module commonjs --outDir ./dist/cjs && echo '{\"type\":\"commonjs\"}' > dist/cjs/package.json",
+    "build:esm": "tsc --project tsconfig.json --outDir ./dist/esm && echo '{\"type\":\"module\"}' > dist/esm/package.json",
+    "fix:format": "prettier --write **/*.*",
+    "test:format": "prettier --check **/*.*"
+  },
+  "author": "",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "@pythnetwork/pyth-lazer-sdk": "^0.1.1"
+  },
+  "devDependencies": {
+    "@cprussin/tsconfig": "^3.0.1",
+    "@types/node": "^22.10.0",
+    "prettier": "^3.4.1",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.7.2"
+  }
+}

lazer/js/src/index.ts

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+import { PythLazerClient } from "@pythnetwork/pyth-lazer-sdk";
+
+/* eslint-disable no-console */
+const client = new PythLazerClient(
+  "wss://pyth-lazer-staging.dourolabs.app/v1/stream",
+  "my_token",
+);
+client.addMessageListener((message) => {
+  console.log("got message:", message);
+  switch (message.type) {
+    case "json": {
+      if (message.value.type == "streamUpdated") {
+        console.log(
+          "stream updated for subscription",
+          message.value.subscriptionId,
+          ":",
+          message.value.parsed?.priceFeeds,
+        );
+      }
+      break;
+    }
+    case "binary": {
+      if ("solana" in message.value) {
+        console.log("solana message:", message.value.solana?.toString("hex"));
+      }
+      if ("evm" in message.value) {
+        console.log("evm message:", message.value.evm?.toString("hex"));
+      }
+      break;
+    }
+  }
+});
+client.ws.addEventListener("open", () => {
+  client.send({
+    type: "subscribe",
+    subscriptionId: 1,
+    priceFeedIds: [1, 2],
+    properties: ["price"],
+    chains: ["solana"],
+    deliveryFormat: "json",
+    channel: "fixed_rate@200ms",
+    jsonBinaryEncoding: "hex",
+  });
+});

lazer/js/tsconfig.json

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+{
+  "extends": "@cprussin/tsconfig/base.json",
+  "exclude": [
+    "node_modules",
+    "dist"
+  ]
+}