Initial commit

exam/common.js

@@ -0,0 +1,55 @@
+import fs from 'fs';
+import path from 'path';
+import { exec, execSync } from 'child_process';
+import { promisify } from 'util';
+
+const execPromise = promisify(exec);
+
+export function installDeps() {
+    let parentDirectory = process.cwd();
+    if (parentDirectory.includes('exam') && !fs.existsSync(path.join(parentDirectory, 'exam'))) {
+        parentDirectory = path.join(parentDirectory, '..');
+    }
+
+    const examDirectory = path.join(parentDirectory, 'exam');
+
+    // install starter/exam dependencies
+    if (!fs.existsSync(path.join(examDirectory, 'node_modules'))) {
+        console.log('Installing starter dependencies...');
+        execSync('npm install', { stdio: 'inherit', cwd: examDirectory });
+        console.log('Starter dependencies installed');
+    }
+
+    // install dev dependencies
+    if (!fs.existsSync(path.join(parentDirectory, 'node_modules'))) {
+        // install dev dependencies (in the background)
+        console.log(); console.log(); console.log();
+        console.log('Installing dev dependencies...');
+        installDevDeps(parentDirectory);
+    }
+
+    if (!fs.existsSync(path.join(parentDirectory, 'hardhat', 'node_modules'))) {
+        // install hardhat dependencies (in the background)
+        console.log(); console.log(); console.log();
+        console.log('Installing hardhat dependencies...');
+        installDevDeps(path.join(parentDirectory, 'hardhat'));
+    }
+}
+
+async function installDevDeps(workingDirectory, attempt = 1) {
+    try {
+        await execPromise('npm install', { stdio: 'inherit', cwd: workingDirectory });
+        console.log('Dev dependencies installed');
+    } catch (error) {
+        console.error('Error installing dev dependencies:', error.message);
+
+        if (attempt < 3) {
+            const retryDelay = 5000 * attempt;
+            console.log(`Retrying in ${Math.round(retryDelay / 1000)} seconds...`);
+            setTimeout(() => installDevDeps(workingDirectory, attempt + 1), retryDelay);
+        } else {
+            console.error('Failed to install dev dependencies.');
+            console.error('Please try again manually, by running "npm install" in the project directory.');
+        }
+    }
+}