Function extractPermissions

extractPermissions(token: string, claimName?: string): readonly string[]
Extract an array of permission strings from a JWT payload.

Many authorization systems encode permissions in a custom claim (e.g. "permissions", "scope", "roles"). This helper normalises the value to a readonly string[].
Parameters
- token: string
  A JWT in compact serialisation.
- claimName: string = "permissions"
  The claim that holds the permissions. Defaults to "permissions".
Returns readonly string[]
A readonly array of permission strings. Returns an empty array if the claim is absent or not an array.
Example
```
const perms = extractPermissions(rawToken);
// ["user.read", "user.write"]

const scopes = extractPermissions(rawToken, 'scope');
// ["openid", "profile"]
```
- Defined in packages/foundation/src/lib/jwt/jwt.parser.ts:145