export declare enum Edge {
    Rising = 1,
    Falling = -1,
    Both = 0
}
export type Gpio = {
    chip: number;
    line: number;
};
export type DutyCycleSetter = (dutyCycle: number) => void;
export type FrequencySetter = (frequency: number) => void;
export type CleanupCallback = () => void;
export type PinSetter = (value: boolean) => void;
export type PinGetter = () => boolean;
export type WatchCallback = (value: boolean) => void;
export type OpenGpioBindings = {
    info: () => string;
    input: (chip: number, line: number) => [PinGetter, CleanupCallback];
    output: (chip: number, line: number) => [PinSetter, CleanupCallback];
    watch: (chip: number, line: number, callback: WatchCallback) => [PinGetter, CleanupCallback];
    pwm: (chip: number, line: number, dutyCycle: number, frequency: number) => [DutyCycleSetter, FrequencySetter, CleanupCallback];
};