initial support for npm module installation

packages/node_modules/@node-red/runtime/lib/nodes/index.js

@@ -26,6 +26,7 @@ var flows = require("../flows");
 var flowUtil = require("../flows/util")
 var context = require("./context");
 var Node = require("./Node");
+var npmModule = require("./npmModule");
 var log;
 
 const events = require("@node-red/util").events;
@@ -49,6 +50,7 @@ function registerType(nodeSet,type,constructor,opts) {
         type = nodeSet;
         nodeSet = "";
     }
+    var dynModule = null;
     if (opts) {
         if (opts.credentials) {
             credentials.register(type,opts.credentials);
@@ -60,7 +62,11 @@ function registerType(nodeSet,type,constructor,opts) {
                 log.warn("["+type+"] "+err.message);
             }
         }
+        if (opts.dynamicModuleList) {
+            dynModule = opts.dynamicModuleList;
+        }
     }
+    npmModule.register(type, dynModule);
     if(!(constructor.prototype instanceof Node)) {
         if(Object.getPrototypeOf(constructor.prototype) === Object.prototype) {
             util.inherits(constructor,Node);
@@ -110,6 +116,7 @@ function createNode(node,def) {
     } else if (credentials.getDefinition(node.type)) {
         node.credentials = {};
     }
+    return npmModule.checkInstall(def);
 }
 
 function registerSubflow(nodeSet, subflow) {
@@ -138,6 +145,7 @@ function init(runtime) {
     flows.init(runtime);
     registry.init(runtime);
     context.init(runtime.settings);
+    npmModule.init(runtime);
 }
 
 function disableNode(id) {
@@ -261,5 +269,9 @@ module.exports = {
     // Contexts
     loadContextsPlugin: context.load,
     closeContextsPlugin: context.close,
-    listContextStores: context.listStores
+    listContextStores: context.listStores,
+
+    // NPM modules
+    listNPMModules: npmModule.list,
+    loadNPMModule: npmModule.load
 };