some progress

node_modules/bson/src/symbol.ts

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+import { BSONValue } from './bson_value';
+
+/** @public */
+export interface BSONSymbolExtended {
+  $symbol: string;
+}
+
+/**
+ * A class representation of the BSON Symbol type.
+ * @public
+ * @category BSONType
+ */
+export class BSONSymbol extends BSONValue {
+  get _bsontype(): 'BSONSymbol' {
+    return 'BSONSymbol';
+  }
+
+  value!: string;
+  /**
+   * @param value - the string representing the symbol.
+   */
+  constructor(value: string) {
+    super();
+    this.value = value;
+  }
+
+  /** Access the wrapped string value. */
+  valueOf(): string {
+    return this.value;
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  inspect(): string {
+    return `new BSONSymbol("${this.value}")`;
+  }
+
+  toJSON(): string {
+    return this.value;
+  }
+
+  /** @internal */
+  toExtendedJSON(): BSONSymbolExtended {
+    return { $symbol: this.value };
+  }
+
+  /** @internal */
+  static fromExtendedJSON(doc: BSONSymbolExtended): BSONSymbol {
+    return new BSONSymbol(doc.$symbol);
+  }
+
+  /** @internal */
+  [Symbol.for('nodejs.util.inspect.custom')](): string {
+    return this.inspect();
+  }
+}