---
title: Migration
description: All the migration guides
---

# Migration Guide

## v2.0.0

Removed the `DualSignalBuilder` and `TripleSignalBuilder` classes, and refactor the `SignalBuilder` class.

**v1.x.x**:
```dart
SignalBuilder(
  signal: counter,
  builder: (context, value, child) {
    return Text('$value');
  },
),
```

**v2.x.x**:
```dart
SignalBuilder(
  builder: (context, child) {
    return Text('${counter.value}');
  },
),
```

The new `SignalBuilder` is more powerful because it tracks any number of signals used in the builder method.

---

The `context.observe` method now needs `T` to be a `SignalBase`.

**v1.x.x**:
```dart
final counter = context.observe<int>();
```

**v2.x.x**:
```dart
final counter = context.observe<Signal<int>>().value;
```

---

`ResourceBuilder` has been removed in favor of `SignalBuilder`.

**v1.x.x**:
```dart
ResourceBuilder(
  resource: user,
  builder: (context, userState) {
    return userState.on(
      ready: (data) { ... },
      error: (error, stackTrace) { ... },
      loading: () { ... },
    );
  },
),
```

**v2.x.x**:
```dart
SignalBuilder(
  builder: (context, child) {
    return user.state.on(
      ready: (data) { ... },
      error: (error, stackTrace) { ... },
      loading: () { ... },
    );
  },
),
```
---

Removed `SignalOptions` and `ResourceOptions` classes.

**v1.x.x**:
```dart
final counter = Signal(0, options: const SignalOptions<int>(name: 'counter'));
```

**v2.x.x**:
```dart
final counter = Signal(0, name: 'counter');
```