SwiftLint/Source/SwiftLintFramework/Rules/RuleConfigurations/ForWhereRuleConfiguration.swift

struct ForWhereRuleConfiguration: SeverityBasedRuleConfiguration, Equatable {
    private(set) var severityConfiguration = SeverityConfiguration(.warning)
    private(set) var allowForAsFilter = false

    var consoleDescription: String {
        return "severity: \(severityConfiguration.consoleDescription)" + ", allow_for_as_filter: \(allowForAsFilter)"
    }

    mutating func apply(configuration: Any) throws {
        guard let configuration = configuration as? [String: Any] else {
            throw ConfigurationError.unknownConfiguration
        }

        allowForAsFilter = configuration["allow_for_as_filter"] as? Bool ?? false

        if let severityString = configuration["severity"] as? String {
            try severityConfiguration.apply(configuration: severityString)
        }
    }
}