diff --git a/packages-ext/telemetry/src/utils/stream-text-internal.ts b/packages-ext/telemetry/src/utils/stream-text-internal.ts
index 8226c16..4369672 100644
--- a/packages-ext/telemetry/src/utils/stream-text-internal.ts
+++ b/packages-ext/telemetry/src/utils/stream-text-internal.ts
@@ -76,48 +76,3 @@ export const transformChunk = () => {
     },
   })
 }
-
-export class DelayedPromise<T> {
-  get promise(): Promise<T> {
-    if (this._promise == null) {
-      this._promise = new Promise<T>((resolve, reject) => {
-        if (this.status.type === 'resolved') {
-          resolve(this.status.value)
-        }
-        else if (this.status.type === 'rejected') {
-          reject(this.status.error)
-        }
-
-        this._resolve = resolve
-        this._reject = reject
-      })
-    }
-
-    return this._promise
-  }
-
-  private _promise: Promise<T> | undefined
-  private _reject: ((error: unknown) => void) | undefined
-  private _resolve: ((value: T) => void) | undefined
-
-  private status:
-    | { error: unknown, type: 'rejected' }
-    | { type: 'pending' }
-    | { type: 'resolved', value: T } = { type: 'pending' }
-
-  reject(error: unknown): void {
-    this.status = { error, type: 'rejected' }
-
-    if (this._promise) {
-      this._reject?.(error)
-    }
-  }
-
-  resolve(value: T): void {
-    this.status = { type: 'resolved', value }
-
-    if (this._promise) {
-      this._resolve?.(value)
-    }
-  }
-}
diff --git a/packages-ext/telemetry/src/utils/stream-text.ts b/packages-ext/telemetry/src/utils/stream-text.ts
index 8ffaf07..adf030e 100644
--- a/packages-ext/telemetry/src/utils/stream-text.ts
+++ b/packages-ext/telemetry/src/utils/stream-text.ts
@@ -1,6 +1,6 @@
 import type { CompletionStep, CompletionToolCall, CompletionToolResult, FinishReason, Message, StreamTextEvent, StreamTextOptions, StreamTextResult, ToolCall, Usage, WithUnknown } from 'xsai'
 
-import { chat, determineStepType, executeTool, objCamelToSnake, trampoline } from 'xsai'
+import { chat, DelayedPromise, determineStepType, executeTool, objCamelToSnake, trampoline } from 'xsai'
 
 import type { WithTelemetry } from '../types/options'
 
@@ -8,7 +8,7 @@ import { commonAttributes, idAttributes, metadataAttributes } from './attributes
 import { getTracer } from './get-tracer'
 import { now } from './now'
 import { recordSpan, recordSpanSync } from './record-span'
-import { DelayedPromise, transformChunk } from './stream-text-internal'
+import { transformChunk } from './stream-text-internal'
 import { stringifyTool } from './stringify-tool'
 import { wrapTool } from './wrap-tool'
 
diff --git a/packages/stream-text/src/index.ts b/packages/stream-text/src/index.ts
index 959c7ca..27a2925 100644
--- a/packages/stream-text/src/index.ts
+++ b/packages/stream-text/src/index.ts
@@ -1,12 +1,11 @@
 import type { WithUnknown } from '@xsai/shared'
 import type { ChatOptions, CompletionStep, CompletionToolCall, CompletionToolResult, FinishReason, Message, ToolCall, Usage } from '@xsai/shared-chat'
 
-import { objCamelToSnake, trampoline } from '@xsai/shared'
+import { DelayedPromise, objCamelToSnake, trampoline } from '@xsai/shared'
 import { chat, determineStepType, executeTool } from '@xsai/shared-chat'
 
 import type { StreamTextEvent } from './types/event'
 
-import { DelayedPromise } from './internal/_delayed-promise'
 import { transformChunk } from './internal/_transform-chunk'
 
 export type * from './types/event'
diff --git a/packages/stream-text/src/internal/_delayed-promise.ts b/packages/stream-text/src/internal/_delayed-promise.ts
deleted file mode 100644
index 55e3804..0000000
--- a/packages/stream-text/src/internal/_delayed-promise.ts
+++ /dev/null
@@ -1,44 +0,0 @@
-export class DelayedPromise<T> {
-  get promise(): Promise<T> {
-    if (this._promise == null) {
-      this._promise = new Promise<T>((resolve, reject) => {
-        if (this.status.type === 'resolved') {
-          resolve(this.status.value)
-        }
-        else if (this.status.type === 'rejected') {
-          reject(this.status.error)
-        }
-
-        this._resolve = resolve
-        this._reject = reject
-      })
-    }
-
-    return this._promise
-  }
-
-  private _promise: Promise<T> | undefined
-  private _reject: ((error: unknown) => void) | undefined
-  private _resolve: ((value: T) => void) | undefined
-
-  private status:
-    | { error: unknown, type: 'rejected' }
-    | { type: 'pending' }
-    | { type: 'resolved', value: T } = { type: 'pending' }
-
-  reject(error: unknown): void {
-    this.status = { error, type: 'rejected' }
-
-    if (this._promise) {
-      this._reject?.(error)
-    }
-  }
-
-  resolve(value: T): void {
-    this.status = { type: 'resolved', value }
-
-    if (this._promise) {
-      this._resolve?.(value)
-    }
-  }
-}