@stdlib/utils/do-while/docs/types/test.ts

Standard utilities.

/*
* @license Apache-2.0
*
* Copyright (c) 2019 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.
*/

import doWhile = require( './index' );

/**
* Predicate function.
*
* @param i - iteration index
* @returns a boolean
*/
function predicate( i: number ): boolean {
	return ( i <= 10 );
}

/**
* Empty function.
*/
function noop() {
	// Body is empty...
}


// TESTS //

// The function does not return a value...
{
	doWhile( noop, predicate ); // $ExpectType void
	doWhile( noop, predicate, {} ); // $ExpectType void
}

// The compiler throws an error if the function is provided a first argument which is not a function...
{
	doWhile( 'abc', predicate ); // $ExpectError
	doWhile( 5, predicate ); // $ExpectError
	doWhile( true, predicate ); // $ExpectError
	doWhile( false, predicate ); // $ExpectError
	doWhile( [], predicate ); // $ExpectError
	doWhile( {}, predicate ); // $ExpectError
}

// The compiler throws an error if the function is provided a second argument which is not a function...
{
	doWhile( noop, 'abc' ); // $ExpectError
	doWhile( noop, 5 ); // $ExpectError
	doWhile( noop, true ); // $ExpectError
	doWhile( noop, false ); // $ExpectError
	doWhile( noop, [] ); // $ExpectError
	doWhile( noop, {} ); // $ExpectError
}

// The compiler throws an error if the function is provided fewer than two arguments...
{
	doWhile(); // $ExpectError
	doWhile( noop ); // $ExpectError
}