// Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)

  const compilationMachine = Machine({
    id: 'compilation',
    initial: 'idle',
    context: {
      errors: []
    },
    states: {
      idle: {
        on: {
          RUN: 'running'
        }
      },
      running: {
        on: {
          DONE: 'done'
        }
      },
      done: {
        type: 'final'
      }
    }
  });

  const compilerMachine = Machine({
    id: 'compiler',
    initial: "initializing",
    context: {
      compilations: []
    },
    states: {
      initializing: {
        entry: assign({
          compilations: (ctx, e) => {
            return ctx.compilations.map(c => ({
              ...c,
              ref: spawn(compilationMachine.withContext(c))
            }));
          },
        }),
      },
      running: {},
      completed: {}
    },
    on: {
      "MARK.running": {
        actions: ctx => {
          ctx.compilations.forEach(c => c.ref.send("RUN"));
        }
      }
    }
  });