docs: add page for local dev env (#256)

Author: adklempner

docs/build/javascript/local-dev-env.md

@@ -0,0 +1,139 @@
+---
+title: Set Up a Local Development Environment
+---
+
+# Set Up a Local Development Environment
+
+The most reliable way to ensure your js-waku application will work in realistic conditions is to spin up a local nwaku fleet and test against it.
+
+## Requirements
+
+- [Docker Desktop](https://www.docker.com/products/docker-desktop/) or Docker Engine with Compose plugin
+
+## Quick Start
+
+### 1. Start the Network
+
+```bash
+npx @waku/run start
+```
+
+This will:
+- Start 2 nwaku nodes and a PostgreSQL database
+- Run in the background (detached mode)
+- Display connection information you need for your app
+
+**Example output:**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  defaultBootstrap: false,
+  bootstrapPeers: [
+    "/ip4/127.0.0.1/tcp/60000/ws/p2p/16Uiu2HAmF6oAsd23RMAnZb3NJgxXrExxBTPMdEoih232iAZkviU2",
+    "/ip4/127.0.0.1/tcp/60001/ws/p2p/16Uiu2HAm5aZU47YkiUoARqivbCXwuFPzFFXXiURAorySqAQbL6EQ"
+  ],
+  numPeersToUse: 2,
+  libp2p: {
+    filterMultiaddrs: false
+  },
+  networkConfig: {
+    clusterId: 0,
+    numShardsInCluster: 8
+  }
+});
+```
+
+### 2. Connect Your js-waku App
+
+Copy the configuration from the output above and paste it into your application. Then start your node:
+
+```typescript
+await waku.start();
+
+// Your app is now connected to your local Waku network!
+```
+
+### 3. Stop When Done
+
+```bash
+npx @waku/run stop
+```
+
+## Available Commands
+
+### Using npx (published package)
+
+| Command | Description |
+|---------|-------------|
+| `npx @waku/run start` | Start the network (detached) and show connection info |
+| `npx @waku/run stop` | Stop the network and clean up |
+| `npx @waku/run info` | Show connection info for running network |
+| `npx @waku/run logs` | View and follow logs from all nodes |
+| `npx @waku/run test` | Test the network by sending a message |
+
+## Configuration
+
+All configuration is done via environment variables passed to the command.
+
+### Custom Ports
+
+If the default ports are in use, specify custom ports:
+
+```bash
+NODE1_WS_PORT=50000 NODE2_WS_PORT=50001 npx @waku/run start
+```
+
+Available port configuration:
+- `NODE1_WS_PORT` (default: 60000)
+- `NODE2_WS_PORT` (default: 60001)
+- `NODE1_REST_PORT` (default: 8646)
+- `NODE2_REST_PORT` (default: 8647)
+
+### Cluster Configuration
+
+The default configuration uses:
+- Cluster ID: 0
+- Number of shards: 8
+
+To test with a different cluster:
+
+```bash
+CLUSTER_ID=16 npx @waku/run start
+```
+
+### Custom nwaku Version
+
+To use a different nwaku image version:
+
+```bash
+NWAKU_IMAGE=wakuorg/nwaku:v0.35.0 npx @waku/run start
+```
+
+## Debugging
+
+### View Node Logs
+
+```bash
+npx @waku/run logs
+```
+
+### Check Node Health
+
+```bash
+# Node 1
+curl http://127.0.0.1:8646/health
+
+# Node 2
+curl http://127.0.0.1:8647/health
+```
+
+### Check Peer Connections
+
+```bash
+# Node 1 debug info
+curl http://127.0.0.1:8646/debug/v1/info
+
+# Node 2 debug info
+curl http://127.0.0.1:8647/debug/v1/info
+```

sidebars.js

@@ -23,6 +23,7 @@ const sidebars = {
         "build/javascript/message-encryption",
         "build/javascript/use-waku-react",
         "build/javascript/use-waku-create-app",
+        "build/javascript/local-dev-env",
         "build/javascript/configure-discovery",
         "build/javascript/run-waku-nodejs",
         "build/javascript/debug-waku-dapp",