Object.d.ts

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interface PropertyDescriptor {
    configurable?: boolean;
    enumerable?: boolean;
    value?: any;
    writable?: boolean;

    get?(): any;

    set?(v: any): void;
}

interface PropertyDescriptorMap {
    [s: string]: PropertyDescriptor;
}

declare type PropertyKey = string | number | symbol;

/**
 * Marker for contextual 'this' type
 */
interface ThisType<T> { }

interface ObjectConstructor {
    /**
     * Creates an object that has the specified prototype or that has null prototype.
     * @param o Object to use as a prototype. May be null.
     */
    create(o: object | null): any;

    /**
     * Adds a property to an object, or modifies attributes of an existing property.
     * @param o Object on which to add or modify the property. This can be a native JavaScript object (that is, a user-defined object or a built in object) or a DOM object.
     * @param p The property name.
     * @param attributes Descriptor for the property. It can be for a data property or an accessor property.
     */
    defineProperty(o: any, p: PropertyKey, attributes: PropertyDescriptor & ThisType<any>): any;

    /**
     * Adds one or more properties to an object, and/or modifies attributes of existing properties.
     * @param o Object on which to add or modify the properties. This can be a native JavaScript object or a DOM object.
     * @param properties JavaScript object that contains one or more descriptor objects. Each descriptor object describes a data property or an accessor property.
     */
    defineProperties(o: any, properties: PropertyDescriptorMap & ThisType<any>): any;

    /**
     * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
     * @param o Object on which to lock the attributes.
     */
    freeze<T>(o: T[]): readonly T[];

    /**
     * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
     * @param o Object on which to lock the attributes.
     */
    freeze<T extends Function>(o: T): T;

    /**
     * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
     * @param o Object on which to lock the attributes.
     */
    freeze<T>(o: T): Readonly<T>;

    /**
     * Gets the own property descriptor of the specified object.
     * An own property descriptor is one that is defined directly on the object and is not inherited from the object's prototype.
     * @param o Object that contains the property.
     * @param p Name of the property.
     */
    getOwnPropertyDescriptor(o: any, p: PropertyKey): PropertyDescriptor | undefined;

    /**
     * Returns the names of the own properties of an object. The own properties of an object are those that are defined directly
     * on that object, and are not inherited from the object's prototype. The properties of an object include both fields (objects) and functions.
     * @param o Object that contains the own properties.
     */
    getOwnPropertyNames(o: any): string[];

    /**
     * Returns a value that indicates whether new properties can be added to an object.
     * @param o Object to test.
     */
    isExtensible(o: any): boolean;

    /**
     * Returns true if existing property attributes and values cannot be modified in an object, and new properties cannot be added to the object.
     * @param o Object to test.
     */
    isFrozen(o: any): boolean;

    /**
     * Returns true if existing property attributes cannot be modified in an object and new properties cannot be added to the object.
     * @param o Object to test.
     */
    isSealed(o: any): boolean;

    /**
     * Returns the names of the enumerable string properties and methods of an object.
     * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
     */
    keys(o: object): string[];

    /**
     * Prevents the addition of new properties to an object.
     * @param o Object to make non-extensible.
     */
    preventExtensions<T>(o: T): T;

    /**
     * Prevents the modification of attributes of existing properties, and prevents the addition of new properties.
     * @param o Object on which to lock the attributes.
     */
    seal<T>(o: T): T;
}

/**
 * Provides functionality common to all JavaScript objects.
 */
declare var Object: ObjectConstructor;