fix(@angular/cli): fix package manager warnings when running temporary install

Related to: #16205

Author: alan-agius4

packages/angular/cli/tasks/install-package.ts

@@ -8,7 +8,7 @@
 
 import { logging } from '@angular-devkit/core';
 import { spawnSync } from 'child_process';
-import { existsSync, mkdtempSync, readFileSync, realpathSync } from 'fs';
+import { existsSync, mkdtempSync, readFileSync, realpathSync, writeFileSync } from 'fs';
 import { tmpdir } from 'os';
 import { join, resolve } from 'path';
 import * as rimraf from 'rimraf';
@@ -72,6 +72,22 @@ export function installTempPackage(
     } catch {}
   });
 
+  // NPM will warn when a `package.json` is not found in the install directory
+  // Example:
+  // npm WARN enoent ENOENT: no such file or directory, open '/tmp/.ng-temp-packages-84Qi7y/package.json'
+  // npm WARN .ng-temp-packages-84Qi7y No description
+  // npm WARN .ng-temp-packages-84Qi7y No repository field.
+  // npm WARN .ng-temp-packages-84Qi7y No license field.
+
+  // While we can use `npm init -y` we will end up needing to update the 'package.json' anyways
+  // because of missing fields.
+  writeFileSync(join(tempPath, 'package.json'), JSON.stringify({
+    name: 'temp-cli-install',
+    description: 'temp-cli-install',
+    repository: 'temp-cli-install',
+    license: 'MIT',
+  }));
+
   // setup prefix/global modules path
   const packageManagerArgs = getPackageManagerArguments(packageManager);
   const tempNodeModules = join(tempPath, 'node_modules');