Remove request.systemInstruction validation

We only define system prompts via onDeviceParams
initialization.

Author: erikeldridge

packages/vertexai/src/methods/chrome-adapter.test.ts

@@ -108,42 +108,6 @@ describe('ChromeAdapter', () => {
         })
       ).to.be.false;
     });
-    it('returns false if request system instruction has function role', async () => {
-      const adapter = new ChromeAdapter({} as AI, 'prefer_on_device');
-      expect(
-        await adapter.isAvailable({
-          contents: [],
-          systemInstruction: {
-            role: 'function',
-            parts: []
-          }
-        })
-      ).to.be.false;
-    });
-    it('returns false if request system instruction has multiple parts', async () => {
-      const adapter = new ChromeAdapter({} as AI, 'prefer_on_device');
-      expect(
-        await adapter.isAvailable({
-          contents: [],
-          systemInstruction: {
-            role: 'function',
-            parts: [{ text: 'a' }, { text: 'b' }]
-          }
-        })
-      ).to.be.false;
-    });
-    it('returns false if request system instruction has non-text part', async () => {
-      const adapter = new ChromeAdapter({} as AI, 'prefer_on_device');
-      expect(
-        await adapter.isAvailable({
-          contents: [],
-          systemInstruction: {
-            role: 'function',
-            parts: [{ inlineData: { mimeType: 'a', data: 'b' } }]
-          }
-        })
-      ).to.be.false;
-    });
     it('returns true if model is readily available', async () => {
       const aiProvider = {
         languageModel: {

packages/vertexai/src/methods/chrome-adapter.ts

@@ -21,8 +21,7 @@ import {
   EnhancedGenerateContentResponse,
   GenerateContentRequest,
   InferenceMode,
-  Role,
-  TextPart
+  Role
 } from '../types';
 
 /**
@@ -111,25 +110,6 @@ export class ChromeAdapter {
       }
     }
 
-    if (request.systemInstruction) {
-      const systemContent = request.systemInstruction as Content;
-      // Returns false if the role can't be represented on-device.
-      if (systemContent.role && systemContent.role === 'function') {
-        return false;
-      }
-
-      // Returns false if the system prompt is multi-part.
-      if (systemContent.parts && systemContent.parts.length > 1) {
-        return false;
-      }
-
-      // Returns false if the system prompt isn't text.
-      const systemText = request.systemInstruction as TextPart;
-      if (!systemText.text) {
-        return false;
-      }
-    }
-
     return true;
   }
   private async availability(): Promise<AICapabilityAvailability | undefined> {