/* harmony default export */

/* harmony export (binding) */

/* harmony import */

/* harmony reexport (safe) */

/*#__PURE__*/

/**
         * If a prop switches from controlled to Uncontrolled
         * reset its value to the defaultValue
         */

/**
   * If a prop switches from controlled to Uncontrolled
   * reset its value to the defaultValue
   */

/**
   * useful when wrapping a Component and you want to control
   * everything
   */

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

/**
 * Create and returns a single callback ref composed from two other Refs.
 *
 * ```tsx
 * const Button = React.forwardRef((props, ref) => {
 *   const [element, attachRef] = useCallbackRef<HTMLButtonElement>();
 *   const mergedRef = useMergedRefs(ref, attachRef);
 *
 *   return <button ref={mergedRef} {...props}/>
 * })
 * ```
 *
 * @param refA A Callback or mutable Ref
 * @param refB A Callback or mutable Ref
 * @category refs
 */

/**
 * Creates a `Ref` whose value is updated in an effect, ensuring the most recent
 * value is the one rendered with. Generally only required for Concurrent mode usage
 * where previous work in `render()` may be discarded befor being used.
 *
 * This is safe to access in an event handler.
 *
 * @param value The `Ref` value
 */

/**
 * Returns a function that triggers a component update. the hook equivalent to
 * `this.forceUpdate()` in a class component. In most cases using a state value directly
 * is preferable but may be required in some advanced usages of refs for interop or
 * when direct DOM manipulation is required.
 *
 * ```ts
 * const forceUpdate = useForceUpdate();
 *
 * const updateOnClick = useCallback(() => {
 *  forceUpdate()
 * }, [forceUpdate])
 *
 * return <button type="button" onClick={updateOnClick}>Hi there</button>
 * ```
 */

/**
 * Use invariant() to assert state which your program assumes to be true.
 *
 * Provide sprintf-style format (only %s is supported) and arguments
 * to provide information about what broke and what you were
 * expecting.
 *
 * The invariant message will be stripped in production, but the invariant
 * will remain to ensure logic does not differ in production.
 */

/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/**
* Generate a frequency table.
*
* @module @stdlib/utils/tabulate
*
* @example
* var tabulate = require( '@stdlib/utils/tabulate' );
*
* var arr = [ 'beep', 'boop', 'foo', 'beep' ];
*
* var out = tabulate( arr );
* // returns [ [ 'beep', 2, 0.5 ], [ 'boop', 1, 0.25 ], [ 'foo', 1, 0.25 ] ]
*/

/**
* Generates a frequency table.
*
* ## Notes
*
* -   The output is an array of arrays. Each sub-array corresponds to a unique value in the input collection and is structured as follows:
*
*     -   0: unique value
*     -   1: value count
*     -   2: frequency percentage
*
*
* @param {Collection} collection - input collection
* @throws {TypeError} first argument must be a collection
* @returns {(Array<Array>|Array)} frequency table
*
* @example
* var arr = [ 'beep', 'boop', 'foo', 'beep' ];
*
* var out = tabulate( arr );
* // returns [ [ 'beep', 2, 0.5 ], [ 'boop', 1, 0.25 ], [ 'foo', 1, 0.25 ] ]
*/

/**
* Test if a value is an empty array.
*
* @module @stdlib/assert/is-empty-array
*
* @example
* var isEmptyArray = require( '@stdlib/assert/is-empty-array' );
*
* var bool = isEmptyArray( [] );
* // returns true
*
* bool = isEmptyArray( [ 1, 2, 3 ] );
* // returns false
*
* bool = isEmptyArray( {} );
* // returns false
*/

/**
* Tests if a value is an empty array.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether value is an empty array
*
* @example
* var bool = isEmptyArray( [] );
* // returns true
*
* @example
* var bool = isEmptyArray( [ 1, 2, 3 ] );
* // returns false
*
* @example
* var bool = isEmptyArray( {} );
* // returns false
*/

/***/

// 16.3+ will not execute our will-update method;

// A ref and forceUpdate for refocus, b/c we only want to trigger when needed

// Add a flag to suppress these warnings for this special case.

// As a workaround, use cWM and cWRP to invoke the new static lifecycle.

// As a workaround, use cWU to invoke the new lifecycle.

// Because for <= 15.x versions this might be a "prevContext" object.

// Because get-snapshot might return a falsy value.

// Because they would work differently between older and newer (16.3+) versions of React.

// Binding "this" is important for shallow renderer support.

// Call this.constructor.gDSFP to support sub-classes.

// Compute percentages...

// EXPORTS //

// Error if any of these lifecycles are present,

// For each collection element, determine if we've seen the element before. If not, cache a reference which points to its location in the output array; otherwise, update the running count.

// If new component APIs are defined, "unsafe" lifecycles won't be called.

// It will pass a snapshot value to did-update though.

// MAIN //

// MODULES //

// Newer versions of React will ignore that lifecycle if gSBU exists.

// Newer versions of React will ignore these lifecycles if gDSFP exists.

// Older versions will require our polyfilled will-update value.

// React <= 16.2 does not support getSnapshotBeforeUpdate.

// React <= 16.2 does not support static getDerivedStateFromProps.

// React may warn about cWM/cWRP/cWU methods being deprecated.

// So check for the explicit __reactInternalSnapshotFlag flag to determine behavior.

// TODO: Restrict eventKey to string in v5?

// Use the setState() updater to ensure state isn't stale in certain edge cases.

// We also can't just check "__reactInternalSnapshot",

// We need to handle both cases, but can't just check for the presence of "maybeSnapshot",

// add default propTypes for folks that use runtime checks

// and don't want to reset the set in the effect

// used by NavLink to determine it's role

// we don't care about invariant's own frame

//let setState trigger the update
