lib: do not freeze MetricReport and Metric

Author: Qard

lib/metrics.js

@@ -60,40 +60,65 @@ function mixMeta(a, b) {
  * Represents a single reported metric.
  */
 class MetricReport {
+  #type;
+  #name;
+  #value;
+  #meta;
+  #time;
+
+  /**
+   * Constructs a new metric report.
+   * @param {string} type The type of metric.
+   * @param {string} name The name of the metric.
+   * @param {number} value The value of the metric.
+   * @param {object} [meta] Additional metadata to include with the report.
+   */
+  constructor(type, name, value, meta) {
+    this.#type = type;
+    this.#name = name;
+    this.#value = value;
+    this.#meta = meta;
+    this.#time = performance.now();
+  }
+
   /**
    * The type of metric.
    * @property {string} type
    */
+  get type() {
+    return this.#type;
+  }
 
   /**
    * The name of the metric.
    * @property {string} name
    */
+  get name() {
+    return this.#name;
+  }
 
   /**
    * The value of the metric.
    * @property {number} value
    */
+  get value() {
+    return this.#value;
+  }
 
   /**
    * Additional metadata to include with the report.
    * @property {object} meta
    */
+  get meta() {
+    return this.#meta;
+  }
 
   /**
-   * Constructs a new metric report.
-   * @param {string} type The type of metric.
-   * @param {string} name The name of the metric.
-   * @param {number} value The value of the metric.
-   * @param {object} [meta] Additional metadata to include with the report.
+   * The timestamp of the report.
+   * @property {number} time
    */
-  constructor(type, name, value, meta) {
-    this.type = type;
-    this.name = name;
-    this.value = value;
-    this.meta = meta;
-    this.time = performance.now();
-    ObjectFreeze(this);
+  get time() {
+    return this.#time;
   }
 
   /**
@@ -179,21 +204,9 @@ class MetricReport {
  */
 class Metric {
   #channel;
-
-  /**
-   * The type of metric.
-   * @property {string} type
-   */
-
-  /**
-   * The name of the metric.
-   * @property {string} name
-   */
-
-  /**
-   * Additional metadata to include with the metric.
-   * @property {object} meta
-   */
+  #type;
+  #name;
+  #meta;
 
   /**
    * Constructs a new metric.
@@ -212,9 +225,9 @@ class Metric {
       throw new ERR_INVALID_ARG_TYPE('meta', ['object', 'undefined'], meta);
     }
 
-    this.type = type;
-    this.name = name;
-    this.meta = meta;
+    this.#type = type;
+    this.#name = name;
+    this.#meta = meta;
 
     // Before acquiring the channel, check if it already exists.
     const exists = hasChannel(this.channelName);
@@ -225,8 +238,30 @@ class Metric {
     if (!exists && newMetricChannel.hasSubscribers) {
       newMetricChannel.publish(this);
     }
+  }
 
-    ObjectFreeze(this);
+  /**
+   * The type of metric.
+   * @property {string} type
+   */
+  get type() {
+    return this.#type;
+  }
+
+  /**
+   * The name of the metric.
+   * @property {string} name
+   */
+  get name() {
+    return this.#name;
+  }
+
+  /**
+   * Additional metadata to include with the metric.
+   * @property {object} meta
+   */
+  get meta() {
+    return this.#meta;
   }
 
   /**