/**
 * Utilities checking arguments.
 *
 * @public
 * @module lang/assert
 */
/**
 * Throws an error if an argument doesn't conform to the desired specification (as
 * determined by a type check).
 *
 * @static
 * @param {*} variable - The value to check.
 * @param {string=} variableName - The name of the value (used for formatting an error message).
 * @param {*=} type - The expected type of the argument.
 * @param {string=} typeDescription - The description of the expected type (used for formatting an error message).
 */
export function argumentIsRequired(variable: any, variableName?: string | undefined, type?: any | undefined, typeDescription?: string | undefined): void;
/**
 * A relaxed version of the "argumentIsRequired" function that will not throw if
 * the value is undefined or null.
 *
 * @static
 * @param {*} variable - The value to check.
 * @param {string=} variableName - The name of the value (used for formatting an error message).
 * @param {*=} type - The expected type of the argument.
 * @param {string=} typeDescription - The description of the expected type (used for formatting an error message).
 * @param {Function=} predicate - A function used to validate the item (beyond type checking).
 * @param {string=} predicateDescription - A description of the assertion made by the predicate (e.g. "is an integer") that is used for formatting an error message.
 */
export function argumentIsOptional(variable: any, variableName?: string | undefined, type?: any | undefined, typeDescription?: string | undefined, predicate?: Function | undefined, predicateDescription?: string | undefined): void;
/**
 * Throws an error when a value is not an array or its items do not satisfy the supplied constraint.
 *
 * @public
 * @param {*} variable
 * @param {*} variableName
 * @param {*} itemConstraint
 * @param {*} itemConstraintDescription
 */
export function argumentIsArray(variable: any, variableName: any, itemConstraint: any, itemConstraintDescription: any): void;
/**
 * Throws an error if an argument doesn't conform to the desired specification
 * (as determined by a predicate).
 *
 * @static
 * @param {*} variable - The value to check.
 * @param {string=} variableName - The name of the value (used for formatting an error message).
 * @param {Function=} predicate - A function used to validate the item (beyond type checking).
 * @param {string=} predicateDescription - A description of the assertion made by the predicate (e.g. "is an integer") that is used for formatting an error message.
 */
export function argumentIsValid(variable: any, variableName?: string | undefined, predicate?: Function | undefined, predicateDescription?: string | undefined): void;
/**
 * Throws an error when two values are not strictly equal.
 *
 * @public
 * @param {*} a
 * @param {*} b
 * @param {*=} descriptionA
 * @param {*=} descriptionB
 */
export function areEqual(a: any, b: any, descriptionA?: any | undefined, descriptionB?: any | undefined): void;
/**
 * Throws an error when two values are strictly equal.
 *
 * @public
 * @param {*} a
 * @param {*} b
 * @param {*} descriptionA
 * @param {*} descriptionB
 */
export function areNotEqual(a: any, b: any, descriptionA: any, descriptionB: any): void;