# Context Module 1.17.1 → 2.0.0

## Breaking changes

### `setChain()` now required

`ContextModuleBuilder.build()` now throws if `setChain()` has not been called.

Signer builders (`SignerEthBuilder`, `SignerSolanaBuilder`, `SignerConcordiumBuilder`) already call `setChain()` internally — **no change is needed** if you only use those builders with the default context module.

**Who is affected:** any code that calls `new ContextModuleBuilder(...)` directly (for example, to create a custom context module for a specific signer).

#### Before (v1.17.1)

```typescript
import { ContextModuleBuilder } from "@ledgerhq/context-module";

const contextModule = new ContextModuleBuilder({ originToken }).build();
```

#### After (v2.0.0)

Pass the chain that matches your signer using `ContextModuleChainID`:

```typescript
import {
  ContextModuleBuilder,
  ContextModuleChainID,
} from "@ledgerhq/context-module";

// Ethereum signer
const contextModule = new ContextModuleBuilder({ originToken })
  .setChain(ContextModuleChainID.Ethereum)
  .build();

// Solana signer
const contextModule = new ContextModuleBuilder({ originToken })
  .setChain(ContextModuleChainID.Solana)
  .build();

// Concordium signer
const contextModule = new ContextModuleBuilder({ originToken })
  .setChain(ContextModuleChainID.Concordium)
  .build();
```

#### Available chains

| `ContextModuleChainID` | Value          | Signer                    |
| ---------------------- | -------------- | ------------------------- |
| `Ethereum`             | `"ethereum"`   | `SignerEthBuilder`        |
| `Solana`               | `"solana"`     | `SignerSolanaBuilder`     |
| `Concordium`           | `"concordium"` | `SignerConcordiumBuilder` |

#### Error message

If `setChain()` is omitted, `build()` throws:

```
[ContextModuleBuilder] setChain() must be called before build()
```

### `getSolanaContext()` removed from `ContextModule`

The `getSolanaContext()` method has been removed from the `ContextModule` interface and `DefaultContextModule`. Solana context is now fetched through the standard `getContexts()` path like any other chain.

**Who is affected:** any code that calls `contextModule.getSolanaContext()` directly.

#### Before (v1.17.1)

```typescript
const solanaContext = await contextModule.getSolanaContext(transaction);
```

#### After (v2.0.0)

```typescript
const contexts = await contextModule.getContexts(transaction);
```

## What changed

- The context module is now chain-aware at build time. The DI container loads only the factories relevant to the declared chain.
- `ContextModuleChainID` enum is now exported from `@ledgerhq/context-module`.
- Solana and Concordium are now first-class supported chains alongside Ethereum.