cli,create-app: refactor package versions handling + fix tasks test

packages/create-app/src/createApp.ts

@@ -22,7 +22,6 @@ import inquirer, { Answers, Question } from 'inquirer';
 import { exec as execCb } from 'child_process';
 import { resolve as resolvePath } from 'path';
 import { findPaths } from '@backstage/cli-common';
-import { versions } from './versions';
 import os from 'os';
 import { Task, templatingTask } from './lib/tasks';
 
@@ -133,7 +132,7 @@ export default async (cmd: Command): Promise<void> => {
     await createTemporaryAppFolder(tempDir);
 
     Task.section('Preparing files');
-    await templatingTask(templateDir, tempDir, answers, versions);
+    await templatingTask(templateDir, tempDir, answers);
 
     Task.section('Moving to final location');
     await moveApp(tempDir, appDir, answers.name);

packages/create-app/src/lib/tasks.ts

@@ -20,6 +20,7 @@ import handlebars from 'handlebars';
 import ora from 'ora';
 import { basename, dirname } from 'path';
 import recursive from 'recursive-readdir';
+import { packageVersions } from './versions';
 
 const TASK_NAME_MAX_LENGTH = 14;
 
@@ -68,7 +69,6 @@ export async function templatingTask(
   templateDir: string,
   destinationDir: string,
   context: any,
-  versions: { [name: string]: string },
 ) {
   const files = await recursive(templateDir).catch(error => {
     throw new Error(`Failed to read template directory: ${error.message}`);
@@ -88,9 +88,9 @@ export async function templatingTask(
           { name: basename(destination), ...context },
           {
             helpers: {
-              version(name: string) {
-                if (versions[name]) {
-                  return versions[name];
+              version(name: keyof typeof packageVersions) {
+                if (name in packageVersions) {
+                  return packageVersions[name];
                 }
                 throw new Error(`No version available for package ${name}`);
               },

packages/create-app/src/lib/versions.ts

@@ -54,7 +54,7 @@ import { version as pluginUserSettings } from '@backstage/plugin-user-settings/p
 import { version as testUtils } from '@backstage/test-utils/package.json';
 import { version as theme } from '@backstage/theme/package.json';
 
-export const versions = {
+export const packageVersions = {
   '@backstage/backend-common': backendCommon,
   '@backstage/catalog-model': catalogModel,
   '@backstage/cli': cli,