Function.d.ts

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/**
 * Creates a new function.
 */
interface Function {
    /**
     * For a given function, creates a bound function that has the same body as the original function.
     * The this object of the bound function is associated with the specified object, and has the specified initial parameters.
     * @param thisArg An object to which the this keyword can refer inside the new function.
     * @param argArray A list of arguments to be passed to the new function.
     */
    bind(this: Function, thisArg: any, ...argArray: any[]): any;
}