feat(backend): show error if NodeJS is not installed

packages/backend/src/messages.ts

@@ -40,4 +40,6 @@ export default {
   changing_owner_permissions: (globalNpmPath: string) => `Changing permissions of "${globalNpmPath}" folder...`,
   timeout_install_generators:
     "Some generators were not installed. You can continue to work in SAP Business Application Studio and we will retry next time you restart the dev space.",
+  nodejs_install_not_found:
+    "Node.js installation cannot be detected. Please ensure you have installed Node.js before attempting to use Template Wizard",
 };

packages/backend/src/panels/YeomanUIPanel.ts

@@ -15,6 +15,7 @@ import { homedir } from "os";
 import { NpmCommand } from "../utils/npm";
 import { Constants } from "../utils/constants";
 import { notifyGeneratorsInstallationProgress } from "../utils/generators-installation-progress";
+import messages from "../messages";
 
 export class YeomanUIPanel extends AbstractWebviewPanel {
   public static YEOMAN_UI = "Application Wizard";
@@ -41,6 +42,10 @@ export class YeomanUIPanel extends AbstractWebviewPanel {
   }
 
   public async loadWebviewPanel(uiOptions?: any): Promise<void> {
+    if (!Constants.IS_IN_BAS && (await NpmCommand.getNodeProcessVersions()).node === undefined) {
+      void vscode.window.showErrorMessage(messages.nodejs_install_not_found);
+      return;
+    }
     const genNamespace = uiOptions?.generator;
     if (genNamespace) {
       const gensNS = await Env.getAllGeneratorNamespaces();

packages/backend/src/utils/npm.ts

@@ -12,6 +12,8 @@ import * as npmFetch from "npm-registry-fetch";
 import { LookupGeneratorMeta } from "yeoman-environment";
 import { getConsoleWarnLogger } from "../logger/console-logger";
 import { Constants } from "./constants";
+import { spawn } from "child_process";
+import * as os from "os";
 
 const promisifiedExec = promisify(exec);
 
@@ -164,7 +166,10 @@ class Command {
   public async getPackagesData(query = "", author = ""): Promise<PackagesData> {
     const gensQueryUrl = NpmCommand.getGensQueryURL(query, author);
     const queryResult: any = await npmFetch.json(gensQueryUrl);
-    return { packages: _.get(queryResult, "objects", []), total: queryResult.total };
+    return {
+      packages: _.get(queryResult, "objects", []),
+      total: queryResult.total,
+    };
   }
 
   public async getPackageJsons(gensMeta: LookupGeneratorMeta[]): Promise<any[]> {
@@ -194,6 +199,40 @@ class Command {
     return this.execCommand(command);
   }
 
+  public async getNodeProcessVersions(): Promise<NodeJS.ProcessVersions> {
+    try {
+      const output = await this.spawnCommand("node", ["-p", "JSON.stringify(process.versions)"]);
+      return JSON.parse(output);
+    } catch (e) {
+      getConsoleWarnLogger().error(`Error retrieving NodeJS process versions: ${e.message}`);
+      return {} as NodeJS.ProcessVersions;
+    }
+  }
+
+  private spawnCommand(command: string, commandArgs: string[]): Promise<string> {
+    return new Promise((resolve, reject) => {
+      const spawnOptions = /^win/.test(process.platform)
+        ? { windowsVerbatimArguments: true, shell: true, cwd: os.homedir() }
+        : { cwd: os.homedir() };
+      let output = "";
+      const spawnProcess = spawn(command, commandArgs, spawnOptions);
+      spawnProcess.stdout.on("data", (data) => {
+        const newData = data.toString();
+        output += newData;
+      });
+      spawnProcess.stderr.on("data", (data) => {
+        const newData = data.toString();
+        output += newData;
+      });
+      spawnProcess.on("exit", () => {
+        resolve(output);
+      });
+      spawnProcess.on("error", (error) => {
+        reject(error);
+      });
+    });
+  }
+
   public async checkAccessAndSetGeneratorsPath() {
     if (!Constants.IS_IN_BAS) {
       const accessResult = await this.getAccessResult();

packages/backend/test/panels/YeomanUIPanel.spec.ts

@@ -10,6 +10,7 @@ import { set } from "lodash";
 import { expect } from "chai";
 import { join } from "path";
 import { homedir } from "os";
+import messages from "../../src/messages";
 
 describe("YeomanUIPanel unit test", () => {
   let sandbox: SinonSandbox;
@@ -60,6 +61,7 @@ describe("YeomanUIPanel unit test", () => {
     });
 
     it("generator is choosen", () => {
+      npmUtilsMock.expects("getNodeProcessVersions").resolves({ node: "20.6.0" });
       envUtilsMock.expects("getAllGeneratorNamespaces").twice().resolves(["gen1:test", "test:app", "code:app"]);
       windowMock.expects("showQuickPick").resolves("test:app");
       void panel.runGenerator();
@@ -69,6 +71,7 @@ describe("YeomanUIPanel unit test", () => {
   describe("loadWebviewPanel", () => {
     describe("in VSCODE", () => {
       beforeEach(() => {
+        npmUtilsMock.expects("getNodeProcessVersions").resolves({ node: "20.6.0" });
         Constants["IS_IN_BAS"] = false;
       });
 
@@ -130,6 +133,18 @@ describe("YeomanUIPanel unit test", () => {
         void panel.loadWebviewPanel({ generator: "test:app" });
       });
     });
+
+    describe("no NodeJS installation is found in VSCode", () => {
+      beforeEach(() => {
+        npmUtilsMock.expects("getNodeProcessVersions").resolves({});
+        Constants["IS_IN_BAS"] = false;
+      });
+
+      it("should show an error message", () => {
+        windowMock.expects("showErrorMessage").withExactArgs(messages.nodejs_install_not_found);
+        void panel.loadWebviewPanel();
+      });
+    });
   });
 
   describe("toggleOutput", () => {