Simple APIError code parser

type APIError = {
    name: string
    message: string
    data?: unknown
}

type ErrorResponseData = {
    errors: APIError[]
}

function hasErrorCode(data: unknown): data is { code: string } {
    return !!data && typeof data === 'object' && 'code' in data
}

function getFirstErrorCode(errors: APIError[]): string | undefined {
    for (const err of errors) {
        if (hasErrorCode(err)) return err.code
    }
    return undefined
}