cli: Print filename in question that throws during import

cli.mjs

@@ -50,8 +50,8 @@ cli.processTargets().then(function() {
         })
     }, function(err) {
       console.log('')
-      console.error('\x1b[31mUnknown error while opening files\x1b[0m')
-      printError(err)
+      console.error('\x1b[31m' + err.message + '\x1b[0m')
+      printError(err.inner)
       process.exit(1)
     })
 }, function(err) {

lib/cli.mjs

@@ -62,9 +62,15 @@ CLI.prototype.loadFiles = async function() {
 
   for (let i = 0; i < this.files.length; i++) {
     if (this.files[i].endsWith('.mjs') || this.files[i].endsWith('.js')) {
-      this.e.setFilename(this.files[i])
-      await import('file:///' + path.join(cwd, this.files[i]))
-      this.e.resetFilename()
+      try {
+        this.e.setFilename(this.files[i])
+        await import('file:///' + path.join(cwd, this.files[i]))
+        this.e.resetFilename()
+      } catch (e) {
+        let newError = new Error(`Error while loading ${this.files[i]}`)
+        newError.inner = e
+        throw newError
+      }
     }
   }
 }