fix plugin:diff

packages/cli/src/commands/create-plugin/createPlugin.ts

@@ -228,10 +228,10 @@ export default async (cmd: Command) => {
     ? `@${cmd.scope.replace(/^@/, '')}/plugin-${answers.id}`
     : `plugin-${answers.id}`;
   const scopeName = cmd.scope ? `@${cmd.scope.replace(/^@/, '')}` : '';
-  const registryURL =
+  const npmRegistry =
     cmd.npmRegistry && cmd.scope
-      ? `"${scopeName}:registry": "${cmd.npmRegistry}",`
-      : null;
+      ? `"${scopeName}:registry": "${cmd.npmRegistry}"`
+      : '';
   const privatePackage = cmd.private === false ? false : true;
 
   const appPackage = paths.resolveTargetRoot('packages/app');
@@ -261,7 +261,7 @@ export default async (cmd: Command) => {
       scopeName,
       name,
       privatePackage,
-      registryURL,
+      npmRegistry,
     });
 
     Task.section('Moving to final location');

packages/cli/src/commands/plugin/diff.ts

@@ -30,6 +30,9 @@ import { version as backstageVersion } from '../../lib/version';
 export type PluginData = {
   id: string;
   name: string;
+  privatePackage: string;
+  version: string;
+  npmRegistry: string;
 };
 
 const fileHandlers = [
@@ -62,14 +65,9 @@ export default async (cmd: Command) => {
     promptFunc = yesPromptFunc;
   }
 
-  const { version } = await fs.readJson(paths.resolveTargetRoot('lerna.json'));
-
   const data = await readPluginData();
-  const privatePackage = false;
   const templateFiles = await diffTemplateFiles('default-plugin', {
-    version,
     backstageVersion,
-    privatePackage,
     ...data,
   });
   await handleAllFiles(fileHandlers, templateFiles, promptFunc);
@@ -79,9 +77,19 @@ export default async (cmd: Command) => {
 // Reads templating data from the existing plugin
 async function readPluginData(): Promise<PluginData> {
   let name: string;
+  let privatePackage: string;
+  let version: string;
+  let npmRegistry: string;
   try {
     const pkg = require(paths.resolveTarget('package.json'));
     name = pkg.name;
+    privatePackage = pkg.private;
+    version = pkg.version;
+    const scope = name.split('/')[0];
+    if (`${scope}:registry` in pkg.publishConfig) {
+      const registryURL = pkg.publishConfig[`${scope}:registry`];
+      npmRegistry = `"${scope}:registry" : "${registryURL}"`;
+    } else npmRegistry = '';
   } catch (error) {
     throw new Error(`Failed to read target package, ${error}`);
   }
@@ -98,5 +106,5 @@ async function readPluginData(): Promise<PluginData> {
 
   const id = pluginIdMatch[1];
 
-  return { id, name };
+  return { id, name, privatePackage, version, npmRegistry };
 }

packages/cli/templates/default-plugin/package.json.hbs

@@ -6,7 +6,8 @@
   "license": "Apache-2.0",
   "private": {{privatePackage}},
   "publishConfig": {
-    {{{registryURL}}}
+{{#if npmRegistry}}    {{{npmRegistry}}},
+{{/if}}
     "access": "public",
     "main": "dist/index.esm.js",
     "types": "dist/index.d.ts"