node-red/packages/node_modules/@node-red/editor-client/src/js/runtime.js

RED.runtime = (function() {
    let state = ""
    let settings = {ui: false, enabled: false};
    const STOPPED = "stopped"
    const STARTED = "started"
    return {
        init: function() {
            // refresh the current runtime status from server
            settings = Object.assign({}, settings, RED.settings.runtimeState);
            RED.runtime.requestState()

            // {id:"flows-run-state", started: false, state: "stopped", retain:true}
            RED.comms.subscribe("notification/flows-run-state",function(topic,msg) {
                RED.events.emit("flows-run-state",msg);
                RED.runtime.updateState(msg.state);
            });
        },
        get state() {
            return state
        },
        get started() {
            return state === STARTED
        },
        get states() {
            return { STOPPED, STARTED }
        },
        updateState: function(newState) {
            state = newState;
            // disable pointer events on node buttons (e.g. inject/debug nodes)
            $(".red-ui-flow-node-button").toggleClass("red-ui-flow-node-button-stopped", state === STOPPED)
            // show/hide Start/Stop based on current state
            if(settings.enabled === true && settings.ui === true) {
                RED.menu.setVisible("deploymenu-item-runtime-stop", state === STARTED)
                RED.menu.setVisible("deploymenu-item-runtime-start", state === STOPPED)
            }
        },
        requestState: function(callback) {
            $.ajax({
                headers: {
                    "Accept":"application/json"
                },
                cache: false,
                url: 'flows/state',
                success: function(data) {
                    RED.runtime.updateState(data.state)
                    if(callback) {
                        callback(data.state)
                    }
                }
            });
        }
    }
})()