refactor: improve error message when executing assembler command with…

…out installing assembler

src/Ignitor/Ace/CoreCommands.ts

@@ -25,6 +25,21 @@ export class CoreCommands {
    */
   public static commandsList = Object.keys(CoreCommands.getManifestJSON())
 
+  /**
+   * A local list of assembler commands. We need this, so that when assembler
+   * is not installed (probably in production) and someone is trying to
+   * build the project by running `serve` or `build`, we should give
+   * them a better descriptive error.
+   *
+   * Also, do note that at times this list will be stale, but we get it back
+   * in sync over time.
+   */
+  public static localCommandsList = [
+    'build',
+    'serve',
+    'invoke',
+  ]
+
   /**
    * Returns assembler manifest file for showing help
    */

src/Ignitor/Ace/index.ts

@@ -127,6 +127,18 @@ export class Ace {
         return
       }
 
+      /**
+       * Trying to run an assembler command without installing assembler
+       */
+      if (
+        CoreCommands.commandsList.length === 0 &&
+        CoreCommands.localCommandsList.includes(argv[0])
+      ) {
+        throw new AceRuntimeException(
+          `Make sure to install "@adonisjs/assembler" before running "${argv[0]}" command`
+        )
+      }
+
       /**
        * Passing manifest json of core commands and generate manifest, so that
        * we can append in the help output