JavaScriptExpert
diff --git a/‎apps/api-extractor/src/analyzer/AstSymbolTable.ts‎
Lines changed: 5 additions & 4 deletions b/‎apps/api-extractor/src/analyzer/AstSymbolTable.ts‎
Lines changed: 5 additions & 4 deletions
diff --git a/‎apps/api-extractor/src/analyzer/TypeScriptHelpers.ts‎
Lines changed: 14 additions & 4 deletions b/‎apps/api-extractor/src/analyzer/TypeScriptHelpers.ts‎
Lines changed: 14 additions & 4 deletions
@@ -229,10 +229,11 @@ export class AstSymbolTable {
   public static getLocalNameForSymbol(symbol: ts.Symbol): string {
     const symbolName: string = symbol.name;
 
-    if (TypeScriptHelpers.isWellKnownSymbolName(symbolName)) {
-      // TypeScript binds well-known ECMAScript symbols like "Symbol.iterator" as "__@iterator".
-      // This converts a string like "__@iterator" into the property name "[Symbol.iterator]".
-      return `[Symbol.${symbolName.slice(3)}]`;
+    // TypeScript binds well-known ECMAScript symbols like "[Symbol.iterator]" as "__@iterator".
+    // Decode it back into "[Symbol.iterator]".
+    const wellKnownSymbolName: string | undefined = TypeScriptHelpers.tryDecodeWellKnownSymbolName(symbolName);
+    if (wellKnownSymbolName) {
+      return wellKnownSymbolName;
     }
 
     const isUniqueSymbol: boolean = TypeScriptHelpers.isUniqueSymbolName(symbolName);
 
@@ -212,13 +212,23 @@ export class TypeScriptHelpers {
 
   // Matches TypeScript's encoded names for well-known ECMAScript symbols like
   // "__@iterator" or "__@toStringTag".
-  private static readonly _wellKnownSymbolNameRegExp: RegExp = /^__@\w+$/;
+  private static readonly _wellKnownSymbolNameRegExp: RegExp = /^__@(\w+)$/;
 
   /**
-   * Returns whether the provided name was generated for a built-in ECMAScript symbol.
+   * Decodes the names that the compiler generates for a built-in ECMAScript symbol.
+   *
+   * @remarks
+   * TypeScript binds well-known ECMAScript symbols like `[Symbol.iterator]` as `__@iterator`.
+   * If `name` is of this form, then `tryGetWellKnownSymbolName()` converts it back into e.g. `[Symbol.iterator]`.
+   * If the string does not start with `__@` then `undefined` is returned.
    */
-  public static isWellKnownSymbolName(name: string): boolean {
-    return TypeScriptHelpers._wellKnownSymbolNameRegExp.test(name);
+  public static tryDecodeWellKnownSymbolName(name: string): string | undefined {
+    const match: RegExpExecArray | null = TypeScriptHelpers._wellKnownSymbolNameRegExp.exec(name);
+    if (match) {
+      const identifier: string = match[1];
+      return `[Symbol.${identifier}]`;
+    }
+    return undefined;
   }
 
   // Matches TypeScript's encoded names for late-bound symbols derived from `unique symbol` declarations