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Package: @vendure/core File: types.ts

A type which is used to define valid states and transitions for a state machine based on FSM.


type LightColor = 'Green' | 'Amber' | 'Red';

const trafficLightTransitions: Transitions<LightColor> = {

  Green: {

    to: ['Amber'],


  Amber: {

    to: ['Red'],


  Red: {

    to: ['Green'],



The mergeStrategy property defines how to handle the merging of states when one set of

transitions is being merged with another (as in the case of defining a {@link CustomerOrderProcess})


type Transitions<State extends string, Target extends string = State> = {
    [S in State]: {
        to: Readonly<Target[]>;
        mergeStrategy?: 'merge' | 'replace';