refactor: add utils package to webpack-cli

packages/utils/src/index.ts

@@ -11,3 +11,5 @@ export * from './validate-identifier';
 export * from './prop-types';
 export * from './global-packages-path';
 export * from './get-package-manager';
+export * from './package-exists';
+export * from './run-command';

packages/utils/src/package-exists.ts

@@ -0,0 +1,8 @@
+export function packageExists(packageName: string): boolean {
+    try {
+        require(packageName);
+        return true;
+    } catch (err) {
+        return false;
+    }
+}

packages/utils/src/prompt-installation.ts

@@ -0,0 +1,34 @@
+import { prompt } from 'enquirer';
+import { green } from 'colorette';
+import { runCommand } from './run-command';
+
+/**
+ *
+ * @param packageName
+ * @param preMessage Message to show before the question
+ */
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+export async function promptInstallation(packageName: string, preMessage?: Function) {
+    const packageManager = exports.getPackageManager();
+    const options = [packageManager === 'yarn' ? 'add' : 'install', '-D', packageName];
+
+    const commandToBeRun = `${packageManager} ${options.join(' ')}`;
+    if (preMessage) {
+        preMessage();
+    }
+    const question = `Would you like to install ${packageName}? (That will run ${green(commandToBeRun)})`;
+    const { installConfirm } = await prompt([
+        {
+            type: 'confirm',
+            name: 'installConfirm',
+            message: question,
+            initial: 'Y',
+        },
+    ]);
+    if (installConfirm) {
+        await runCommand(commandToBeRun);
+        return exports.packageExists(packageName);
+    }
+    // eslint-disable-next-line require-atomic-updates
+    process.exitCode = 2;
+}

packages/utils/src/run-command.ts

@@ -0,0 +1,12 @@
+import execa from 'execa';
+
+export async function runCommand(command, args = []): Promise<void> {
+    try {
+        await execa(command, args, {
+            stdio: 'inherit',
+            shell: true,
+        });
+    } catch (e) {
+        throw new Error(e);
+    }
+}