Use actually private fields in the AnnotationStorage class

These fields were never intended to be public, since modifying them manually would lead to inconsistent state, and with modern EcmaScript features we can now enforce this.
Also, this patch removes a couple of JSDoc comments that we generally don't use.

src/display/annotation_storage.js

@@ -21,10 +21,11 @@ import { MurmurHash3_64 } from "../shared/murmurhash3.js";
  * Key/value storage for annotation data in forms.
  */
 class AnnotationStorage {
-  constructor() {
+  #modified = false;
-    this._storage = new Map();
-    this._modified = false;
 
+  #storage = new Map();
+
+  constructor() {
     // Callbacks to signal when the modification state is set or reset.
     // This is used by the viewer to only bind on `beforeunload` if forms
     // are actually edited to prevent doing so unconditionally since that
@@ -36,15 +37,12 @@ class AnnotationStorage {
 
   /**
    * Get the value for a given key if it exists, or return the default value.
-   *
-   * @public
-   * @memberof AnnotationStorage
    * @param {string} key
    * @param {Object} defaultValue
    * @returns {Object}
    */
   getValue(key, defaultValue) {
-    const value = this._storage.get(key);
+    const value = this.#storage.get(key);
     if (value === undefined) {
       return defaultValue;
     }
@@ -54,14 +52,11 @@ class AnnotationStorage {
 
   /**
    * Get the value for a given key.
-   *
-   * @public
-   * @memberof AnnotationStorage
    * @param {string} key
    * @returns {Object}
    */
   getRawValue(key) {
-    return this._storage.get(key);
+    return this.#storage.get(key);
   }
 
   /**
@@ -69,14 +64,14 @@ class AnnotationStorage {
    * @param {string} key
    */
   remove(key) {
-    this._storage.delete(key);
+    this.#storage.delete(key);
 
-    if (this._storage.size === 0) {
+    if (this.#storage.size === 0) {
       this.resetModified();
     }
 
     if (typeof this.onAnnotationEditor === "function") {
-      for (const value of this._storage.values()) {
+      for (const value of this.#storage.values()) {
         if (value instanceof AnnotationEditor) {
           return;
         }
@@ -87,14 +82,11 @@ class AnnotationStorage {
 
   /**
    * Set the value for a given key
-   *
-   * @public
-   * @memberof AnnotationStorage
    * @param {string} key
    * @param {Object} value
    */
   setValue(key, value) {
-    const obj = this._storage.get(key);
+    const obj = this.#storage.get(key);
     let modified = false;
     if (obj !== undefined) {
       for (const [entry, val] of Object.entries(value)) {
@@ -105,7 +97,7 @@ class AnnotationStorage {
       }
     } else {
       modified = true;
-      this._storage.set(key, value);
+      this.#storage.set(key, value);
     }
     if (modified) {
       this.#setModified();
@@ -125,20 +117,20 @@ class AnnotationStorage {
    * @returns {boolean}
    */
   has(key) {
-    return this._storage.has(key);
+    return this.#storage.has(key);
   }
 
   getAll() {
-    return this._storage.size > 0 ? objectFromMap(this._storage) : null;
+    return this.#storage.size > 0 ? objectFromMap(this.#storage) : null;
   }
 
   get size() {
-    return this._storage.size;
+    return this.#storage.size;
   }
 
   #setModified() {
-    if (!this._modified) {
+    if (!this.#modified) {
-      this._modified = true;
+      this.#modified = true;
       if (typeof this.onSetModified === "function") {
         this.onSetModified();
       }
@@ -146,8 +138,8 @@ class AnnotationStorage {
   }
 
   resetModified() {
-    if (this._modified) {
+    if (this.#modified) {
-      this._modified = false;
+      this.#modified = false;
       if (typeof this.onResetModified === "function") {
         this.onResetModified();
       }
@@ -166,12 +158,12 @@ class AnnotationStorage {
    * @ignore
    */
   get serializable() {
-    if (this._storage.size === 0) {
+    if (this.#storage.size === 0) {
       return null;
     }
     const clone = new Map();
 
-    for (const [key, val] of this._storage) {
+    for (const [key, val] of this.#storage) {
       const serialized =
         val instanceof AnnotationEditor ? val.serialize() : val;
       if (serialized) {