My First Clean Architecture

src/background/controllers/completions.js

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+import CompletionsInteractor from '../usecases/completions';
+import Completions from '../domains/completions';
+
+export default class ContentMessageController {
+  constructor() {
+    this.completionsInteractor = new CompletionsInteractor();
+  }
+
+  getCompletions(line) {
+    let trimmed = line.trimStart();
+    let words = trimmed.split(/ +/);
+    let name = words[0];
+    if (words.length === 1) {
+      return this.completionsInteractor.queryConsoleCommand(name);
+    }
+    switch (words[0]) {
+    case 'o':
+    case 'open':
+    case 't':
+    case 'tabopen':
+    case 'w':
+    case 'winopen':
+      break;
+    case 'b':
+    case 'buffer':
+      break;
+    case 'bd!':
+    case 'bdel!':
+    case 'bdelete!':
+    case 'bdeletes!':
+      break;
+    case 'bd':
+    case 'bdel':
+    case 'bdelete':
+    case 'bdeletes':
+      break;
+    case 'set':
+      break;
+    }
+    return Promise.resolve(Completions.empty());
+  }
+}