interface IFlag<T> {
    name: string;
    defaultValue: T;
    description?: string;
    currentValue: T | null;
    validator?: (input: T | null) => boolean;
    isSecret: boolean;
    isSet: boolean;
    isRequired: boolean;
    setDefault(defaultValue: T): this;
    setRequired(required: boolean): this;
    setDescription(description: string): this;
    setValidator(validator: (input: T | null) => boolean): this;
    setSecret(isSecret: boolean): this;
    set(input: T): void;
    get(): T | null;
    parseInput(inp: string): T | null;
    toHelpString(): string;
}
declare global {
    var GLOBAL_FLAGS: {
        [key: string]: IFlag<any>;
    };
}
declare const FLAGS: {
    [key: string]: IFlag<any>;
};

/**
 * If true, then the process will be nicely exit on a parse error.  If false,
 * an Error will be thrown.  Set to false in tests.
 */
declare function setExitOnError(value: boolean): void;
/**
 * Allows an app to add extra usage information that will be shown in the help
 * message, above the flags.
 */
declare function setUsageInfo(value: string): void;
/**
 * Defines a string flag.  e.g. --servername=bob
 */
declare function defineString(name: string, defaultValue?: string, description?: string): IFlag<string>;
/**
 * Defines a boolean flag.   e.g. --turnonlights
 */
declare function defineBoolean(name: string, defaultValue?: boolean, description?: string): IFlag<boolean>;
/**
 * Defines an integer flag.  e.g.  --age=12
 */
declare function defineInteger(name: string, defaultValue?: number, description?: string): IFlag<number>;
/**
 * Defines a number flag.  e.g. --number=1.345
 */
declare function defineNumber(name: string, defaultValue?: number, description?: string): IFlag<number>;
/**
 * Defines a string list flag.  e.g. --animal=frog,bat,chicken
 */
declare function defineStringList(name: string, defaultValue?: string[], description?: string): IFlag<string[]>;
/**
 * Defines a multi string flag.  e.g. --allowedip=127.0.0.1 --allowedip=127.0.0.2
 */
declare function defineMultiString(name: string, defaultValue?: string[], description?: string): IFlag<string[]>;
/**
 * Dumps the help text to the console.
 */
declare function help(): void;
/**
 * Resets the flag values.
 */
declare function reset(): void;
/**
 * Gets the current value of the given flag.
 */
declare function get(name: string): unknown;
/**
 * Gets whether or not the flag was set.
 */
declare function isSet(name: string): boolean;
/**
 * Parses process.argv for flags.  Idempotent if called multiple times.
 */
declare function parse(args?: string[], ignoreUnrecognized?: boolean): string[];

export { FLAGS, defineBoolean, defineInteger, defineMultiString, defineNumber, defineString, defineStringList, get, help, isSet, parse, reset, setExitOnError, setUsageInfo };