/**
 * @returns The global Promise function
 */
export declare const promiseImpl: PromiseConstructor;
/**
 * @returns A new AsyncFunction constuctor
 */
export declare function getAsyncFunctionConstructor(): Function;
/**
 * str.trimLeft polyfill
 *
 * @param str - Input string
 * @returns The string with left whitespace removed
 *
 */
export declare function trimLeft(str: string): string;
/**
 * str.trimRight polyfill
 *
 * @param str - Input string
 * @returns The string with right whitespace removed
 *
 */
export declare function trimRight(str: string): string;
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