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+# Migrating to Waku v0.027
+
+A migration guide for refactoring your application code from Waku v0.026 to v0.027.
+
+## Table of Contents
+
+- [Migrating to Waku v0.027](#migrating-to-waku-v0027)
+  - [Table of Contents](#table-of-contents)
+  - [Network Configuration](#network-configuration)
+    - [Default Network Configuration](#default-network-configuration)
+    - [Static Sharding](#static-sharding)
+    - [Auto Sharding](#auto-sharding)
+  - [Pubsub Topic Configuration](#pubsub-topic-configuration)
+  - [Removed APIs](#removed-apis)
+  - [Type Changes](#type-changes)
+  - [Internal/Private Utility Function Changes](#internalprivate-utility-function-changes)
+
+## Network Configuration
+
+The way to configure network settings for a Waku node has been simplified. The new NetworkConfig type only allows for Static Sharding or Auto Sharding.
+
+### Default Network Configuration
+
+If no network configuration is provided when creating a Light Node, The Waku Network configuration will be used by default.
+
+**Before**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode();
+// This would use the default pubsub topic, that was, `/waku/2/default-waku/proto`
+```
+
+**After**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode();
+// This will now use The Waku Network configuration by default:
+// { clusterId: 1, shards: [0,1,2,3,4,5,6,7] }
+```
+
+### Static Sharding
+
+**Before**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  shardInfo: {
+    clusterId: 1,
+    shards: [0, 1, 2, 3]
+  }
+});
+```
+
+**After**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  networkConfig: {
+    clusterId: 1,
+    shards: [0, 1, 2, 3]
+  }
+});
+```
+
+
+### Auto Sharding
+
+**Before**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  shardInfo: {
+    clusterId: 1,
+    contentTopics: ["/my-app/1/notifications/proto"]
+  }
+});
+```
+
+**After**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  networkConfig: {
+    clusterId: 1,
+    contentTopics: ["/my-app/1/notifications/proto"]
+  }
+});
+```
+
+## Pubsub Topic Configuration
+
+Named pubsub topics are no longer supported. You must use either Static Sharding or Auto Sharding to configure pubsub topics.
+
+**Before**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  pubsubTopics: ["/waku/2/default-waku/proto"]
+});
+```
+
+**After**
+
+Use Static Sharding:
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  networkConfig: {
+    clusterId: 1,
+    shards: [0, 1, 2, 3, 4, 5, 6, 7]
+  }
+});
+```
+
+Or use Auto Sharding:
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  networkConfig: {
+    clusterId: 1,
+    contentTopics: ["/your-app/1/default/proto"]
+  }
+});
+```
+
+## Removed APIs
+
+The following APIs have been removed:
+
+- ApplicationInfo type: Use `string` for application and version in `NetworkConfig` instead.
+- `shardInfo` option in `createLightNode`: Use `networkConfig` instead.
+- `pubsubTopics` option in `createLightNode`: Use `networkConfig` with Static Sharding or Auto Sharding instead.
+
+If you were using `ApplicationInfo` before, you should now use `ContentTopicInfo` (Auto Sharding) and specify your application and version in the content topic `string`.
+
+**Before**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  shardInfo: {
+    clusterId: 1,
+    application: "my-app",
+    version: "1"
+  }
+});
+```
+
+**After**
+```typescript
+import { createLightNode } from "@waku/sdk";
+
+const waku = await createLightNode({
+  networkConfig: {
+    clusterId: 1,
+    contentTopics: ["/my-app/1/default/proto"]
+  }
+});
+```
+
+## Type Changes
+
+- `ShardingParams` has been removed. Use `NetworkConfig` instead.
+- `NetworkConfig` is now defined as `StaticSharding` | `AutoSharding`.
+- `StaticSharding` is equivalent to the previous `ShardInfo`.
+- `AutoSharding` is equivalent to the previous `ContentTopicInfo`.
+
+## Internal/Private Utility Function Changes
+
+Several utility functions have been updated or added:
+
+- `ensureShardingConfigured` has been removed. Use `derivePubsubTopicsFromNetworkConfig` instead.
+- New function `derivePubsubTopicsFromNetworkConfig` has been added to derive pubsub topics from the network configuration.
+- `shardInfoToPubsubTopics` now accepts `Partial<NetworkConfig>` instead of `Partial<ShardingParams>`.
+- New function `pubsubTopicsToShardInfo` has been added to convert pubsub topics to a ShardInfo object.
+
+If you were using any of these utility functions directly, you'll need to update your code accordingly.
+
+**Before**
+```typescript
+import { ensureShardingConfigured } from "@waku/utils";
+
+const result = ensureShardingConfigured(shardInfo);
+```
+
+**After**
+```typescript
+import { derivePubsubTopicsFromNetworkConfig } from "@waku/utils";
+
+const pubsubTopics = derivePubsubTopicsFromNetworkConfig(networkConfig);
+```
+Note: The default `NetworkConfig` for The Waku Network is now `{ clusterId: 1, shards: [0,1,2,3,4,5,6,7] }.`