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machine.js

const generationSucceeded = (c, e) => {
  return e.generationResult && e.generationResult.ok
}

const generationStates = {
  initial: "initial",
  states: {
    initial: {
      on: {
        GENERATE: [
          {
            target: "generated",
            // Only transition to 'searching' if the guard (cond) evaluates to true
            cond: generationSucceeded,
          },
          { target: "generationError" },
        ],
      },
    },
    generationError: {},
    generated: {},
  },
}

const commandMachine = Machine(
  {
    id: "command",
    initial: "invoked",
    context: {
      mode: undefined,
      workspace: undefined, // where tromp.json and commands are run relative to
      configError: undefined,
    },
    states: {
      invoked: {
        entry: [],
        on: {
          EXECUTE: {
            target: "complete",
            actions: [
              // TODO: consider storing "previous command" to state
            ],
          },
          NO_COMMAND: {
            target: "noCommand", // TODO: assign the current filename
            actions: assign({
              // @ts-ignore
              workspace: (_ctx, ev) => ev.workspace,
            }),
          },
          CONFIG_MISSING: {
            target: "configurationMissing",
            actions: assign({
              // @ts-ignore
              workspace: (_ctx, ev) => ev.workspace,
            }),
          },
          CONFIG_ERROR: {
            target: "configurationError",
            actions: assign({
              // @ts-ignore
              configError: (_ctx, ev) => ev.configError,
              // @ts-ignore
              workspace: (_ctx, ev) => ev.workspace,
            }),
          },
          NO_WORKSPACE: "noWorkspace",
        },
      },
      noCommand: {
        on: {
          DISMISS: "complete",
          EDIT: "edit",
        },
      },
      configurationMissing: {
        on: {
          GENERATE: "generating",
          DISMISS: "complete",
        },
      },
      configurationError: {
        on: {
          EDIT: "edit",
          DISMISS: "complete",
        },
      },
      edit: {
        entry: "EDIT_CONFIG",
        on: {
          "": "complete",
        },
      },
      generating: {
        entry: ["GENERATE_CONFIG"],
        ...generationStates,
      },
      noWorkspace: {
        on: {
          DISMISS: "complete",
        },
      },
      complete: {
        type: "final",
      },
    },
  },
  {
    guards: {
      generationSucceeded,
    },
  }
)