Function isCmcdV1Key

isCmcdV1Key(key: string): key is keyof Cmcd
Beta
Filter function for CMCD v1 keys.
Parameters
- key: string
  The CMCD key to filter.
Returns key is keyof Cmcd
true if the key should be included, false otherwise.
Example
```
equal(isCmcdV1Key('br'), true);
equal(isCmcdV1Key('e'), false);
```
- Defined in lib/src/cmcd/isCmcdV1Key.ts:19