yay-machine/dist/MachineState.d.ts

A modern, simple, lightweight, zero-dependency, TypeScript state-machine library

/**
 * The base type for all machine events.
 * User-defined events do not need to extend this interface, just conform to its shape,
 * and can also have their own arbitrary properties.
 */
export interface MachineState<Name extends string = string> {
    /**
     * The unique name (or names if a string-union) of the event.
     */
    readonly name: Name;
}
export type ExtractState<StateType extends MachineState, Name extends StateType["name"]> = Extract<StateType, {
    name: Name;
}> extends never ? ExtractComplexState<StateType, Name> : Extract<StateType, {
    name: Name;
}>;
type ExtractComplexState<StateType extends MachineState, Name extends StateType["name"]> = StateType extends {
    name: infer N;
} ? Name extends N ? StateType : never : never;
export type StateData<StateType extends MachineState, Name extends StateType["name"]> = keyof Omit<ExtractState<StateType, Name>, "name"> extends never ? never : Omit<ExtractState<StateType, Name>, "name">;
type ExpandStateDataTypes<StateType extends MachineState> = {
    [Name in StateType["name"]]: StateData<StateType, Name>;
};
type Values<T> = T[keyof T];
type AllValuesCompatible<T> = Values<T> extends infer V ? {
    [K in keyof T]: V extends T[K] ? true : false;
}[keyof T] extends true ? true : false : false;
export type IsStateDataHomogenous<StateType extends MachineState> = AllValuesCompatible<ExpandStateDataTypes<StateType>>;
export {};
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