remove stale drops on build

bin/buildDrops.js

@@ -47,17 +47,31 @@ const buildDrop = (dropName) => {
     return new Promise((resolve, reject) => {
         console.log(`Building drop: ${dropName}`)
 
-        const child = spawn('npm', ['run', 'build', '-w', `drops/${dropName}`], {
+        // Remove old build to prevent stale output from being used
+        const buildDir = path.join(__dirname, `../app/public/drops/${dropName}`)
+        if (fs.existsSync(buildDir)) {
+            fs.rmSync(buildDir, { recursive: true })
+        }
+
+        const child = spawn(
+            'npm',
+            ['run', 'build', '-w', `drops/${dropName}`],
+            {
                 stdio: 'inherit',
                 shell: true,
-        })
+            },
+        )
 
         child.on('close', (code) => {
             if (code === 0) {
                 console.log(`✓ Successfully built: ${dropName}`)
                 resolve()
             } else {
-                reject(new Error(`Failed to build ${dropName} (exit code ${code})`))
+                reject(
+                    new Error(
+                        `Failed to build ${dropName} (exit code ${code})`,
+                    ),
+                )
             }
         })
 
@@ -76,7 +90,10 @@ const buildAllPublishedDrops = async () => {
         return
     }
 
-    console.log(`Found ${publishedDrops.length} published drop(s):`, publishedDrops)
+    console.log(
+        `Found ${publishedDrops.length} published drop(s):`,
+        publishedDrops,
+    )
     console.log('Starting builds...\n')
 
     for (const dropName of publishedDrops) {