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+/*
+ * Copyright (C) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provides interfaces to trace a task for performance measure, the logs can be capture by the
+ * bytrace cmdline available on the device.
+ *
+ * <p>This interfaces trace the start, end, and value changes of key processes that last for at least 3 ms.
+ *
+ * <p>Example:
+ * To trace a name verification that is expected to complete within 5 ms:
+ * <pre>{@code
+ * bytrace.startTrace("checkName", 111, 5);
+ * //your process
+ * bytrace.finishTrace("checkName", 111);
+ * }</pre>
+ * To trace the number of layers, which is 3:
+ * <pre>{@code
+ * bytrace.traceByValue("curLayer", 3);
+ * }</pre>
+ *
+ * <p>Each {@code startTrace} matches one {@code finishTrace}, and they must have the same name
+ * and taskId.
+ *
+ * @SysCap SystemCapability.Developtools.Bytrace
+ * @devices phone, tablet
+ * @since 7
+ */
+declare namespace bytrace {
+  /**
+   * Records a trace marking it as the start of a task, can with the expected completion time between
+   * startTrace and finishTrace.
+   *
+   * This method is invoked at the start of a transaction to indicate that a task has started, whose name
+   * is specified by {@code name}, and the taskId is used to distinguish the tasks. It must be followed by
+   * {@link #finishTrace}, the name and taskId need to be the same.
+   *
+   * @param name Indicates the task name.
+   * @param taskId The unique id used to distinguish the tasks and match with the id in follow finishTrace.
+   * @param expectedTime Indicates the expected time required for completing the task, in milliseconds.
+   * @since 7
+   */
+  function startTrace(name: string, taskId: number, expectedTime?: number): void;
+
+  /**
+   * Records a trace and marks it as the end of a task.
+   *
+   * This method is invoked at the end of a transaction to indicate that a task has ended, whose name
+   * is specified by {@code name}. This method must be invoked after the the startTrace.
+   *
+   * @param name Indicates the task name. It must be the same whith the {@code name} of startTrace.
+   * @param taskId The unique id used to distinguish the tasks and must be the same whith the .
+   * {@code taskId} of startTrace.
+   * @since 7
+   */
+  function finishTrace(name: string, taskId: number): void;
+
+  /**
+   * Records a trace for generating a count, such as clock pulse and the number of layers.
+   *
+   * @param name Indicates the name used to identify the count.
+   * @param count Indicates the number of the count.
+   * @since 7
+   */
+  function traceByValue(name: string, count: number): void;
+}
+export default bytrace;
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