[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Type](https://evolu.dev/docs/api-reference/common/Type) › CamelCaseIdentifierFromConstantCaseIdentifier

```ts
const CamelCaseIdentifierFromConstantCaseIdentifier: transform(
    "CamelCaseIdentifierFromConstantCaseIdentifier",
    ConstantCaseIdentifier,
    CamelCaseIdentifier,
    {
      from: (value) => ok(constantCaseToCamelCase(value)),
      to: camelCaseToConstantCase,
    },
  );
```

Defined in: [packages/common/src/Type.ts:6025](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L6025)

Decodes a [ConstantCaseIdentifier](https://evolu.dev/docs/api-reference/common/Type/variables/ConstantCaseIdentifier) to a [CamelCaseIdentifier](https://evolu.dev/docs/api-reference/common/Type/variables/CamelCaseIdentifier) and
restores the original spelling when encoding.

### Example

```ts
import {
  assertEqual,
  assertOk,
  CamelCaseIdentifierFromConstantCaseIdentifier,
} from "@evolu/common";

const Key = CamelCaseIdentifierFromConstantCaseIdentifier;
const result = Key.fromUnknown("HTTP2_PORT");
assertOk(result, "http2Port");
assertEqual(Key.to(result.value), "HTTP2_PORT");
```