chore: Changed token_count to only use tokenCountCallback (#272)

lib/llm/chat-completion-message.js

@@ -52,15 +52,13 @@ class LlmChatCompletionMessage extends LlmEvent {
     this.#setId(index)
     if (this.is_response === true) {
       this.role = 'assistant'
-      this.token_count = this.bedrockResponse.outputTokenCount
-      if (this.token_count === undefined && typeof tokenCB === 'function') {
+      if (typeof tokenCB === 'function') {
         this.token_count = tokenCB(this.bedrockCommand.modelId, content)
       }
     } else {
       this.role = 'user'
       this.content = recordContent === true ? this.bedrockCommand.prompt : undefined
-      this.token_count = this.bedrockResponse.inputTokenCount
-      if (this.token_count === undefined && typeof tokenCB === 'function') {
+      if (typeof tokenCB === 'function') {
         this.token_count = tokenCB(this.bedrockCommand.modelId, this.bedrockCommand.prompt)
       }
     }

tests/unit/llm/chat-completion-message.tap.js

@@ -93,7 +93,6 @@ tap.test('create creates a non-response instance', async (t) => {
   t.equal(event.content, 'who are you')
   t.equal(event.role, 'user')
   t.match(event.id, /[\w-]{36}/)
-  t.equal(event.token_count, 8)
 })
 
 tap.test('create creates a titan response instance', async (t) => {
@@ -108,7 +107,6 @@ tap.test('create creates a titan response instance', async (t) => {
   t.equal(event.content, 'a response')
   t.equal(event.role, 'assistant')
   t.match(event.id, /[\w-]{36}-0/)
-  t.equal(event.token_count, 4)
 })
 
 tap.test('create creates a cohere response instance', async (t) => {
@@ -124,7 +122,6 @@ tap.test('create creates a cohere response instance', async (t) => {
   t.equal(event.content, 'a response')
   t.equal(event.role, 'assistant')
   t.match(event.id, /42-0/)
-  t.equal(event.token_count, 4)
 })
 
 tap.test('create creates a ai21 response instance when response.id is undefined', async (t) => {
@@ -140,7 +137,6 @@ tap.test('create creates a ai21 response instance when response.id is undefined'
   t.equal(event.content, 'a response')
   t.equal(event.role, 'assistant')
   t.match(event.id, /[\w-]{36}-0/)
-  t.equal(event.token_count, 4)
 })
 
 tap.test(