/**
 * Substitutes the value of a global variable with another global variable's
 * value, calls the decorated method, and then restores the original value of
 * the substituted global variable. If the second global variable is not defined
 * then the original global variable's value is used.
 *
 * @param target - The global variable to have its value substituted.
 * @param source - The global variable to use as the target's substitute.
 */
export declare function globalSubstitution<T>(target: string, source: string): (_: T, __: string | symbol, descriptor: PropertyDescriptor) => PropertyDescriptor;
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