definition and docs

src/monaco.contribution.ts

@@ -61,7 +61,7 @@ export class LanguageServiceDefaultsImpl implements monaco.languages.typescript.
 		};
 	}
 
-	setExtraLibs(libs: Array<{ content: string; filePath?: string }> = []): IDisposable {
+	setExtraLibs(libs: Array<{ content: string; filePath?: string }>): IDisposable {
 		const paths = [];
 
 		if (libs && libs.length > 0) {

src/monaco.d.ts

@@ -135,11 +135,23 @@ declare module monaco.languages.typescript {
          *
          * @param content The file content
          * @param filePath An optional file path
-         * @returns A disposabled which will remove the file from the
-         * language service upon disposal.
+         * @returns A disposable which will remove the file from the
+         * language service upon cleanup.
          */
         addExtraLib(content: string, filePath?: string): IDisposable;
 
+        /**
+         * Add multiple source files to the language service.
+         * Use this for multiple typescript (definition) files that won't be loaded
+         * as editor document, like `jquery.d.ts`.
+         * This method is optimised for performance and raises change events only once
+         * for the whole list.
+         * @param libs An array of entries to register.
+         * @returns A disposable which will remove the file from the
+         * language service upon cleanup.
+         */
+        setExtraLibs(libs: Array<{ content: string; filePath?: string }>): IDisposable;
+
         /**
          * Set TypeScript compiler options.
          */