Typescript statemachine

class StateMachine {
    private handlers: {[name: string]: (cargo: any) => string | undefined} = {}
    private startState?: string
    private endStates: string[] = []
    private currentState?: string
    private cargo?: any
    private stateHistory: string[] = []

    addState(name: string, handler: (cargo: any) => string | undefined, isEndState = false): void {
        this.handlers[name] = handler
        if (isEndState) {
            this.endStates.push(name)
        }
    }

    setStart(name: string): void {
        this.startState = name
    }

    setCargo(cargo: any): void {
        this.cargo = cargo
    }

    run(): void {
        if (!this.startState || !this.handlers[this.startState]) {
            return
        }
        this.currentState = this.startState
        this.stateHistory.push(this.currentState)

        while (!this.endStates.includes(this.currentState)) {
            const nextState = this.handlers[this.currentState](this.cargo)
            if (!nextState) {
                return
            }
            this.currentState = nextState
            this.stateHistory.push(this.currentState)
        }
    }

    getStateHistory(): string[] {
        return this.stateHistory
    }
}