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Copy pathtest.ts
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57 lines (50 loc) · 1.71 KB
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/*
* @license Apache-2.0
*
* Copyright (c) 2023 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 first = require( './index' );
// TESTS //
// The function returns a string...
{
first( 'abc', 1 ); // $ExpectType string
}
// The compiler throws an error if the function is provided a value other than a string...
{
first( true, 1 ); // $ExpectError
first( false, 1 ); // $ExpectError
first( null, 1 ); // $ExpectError
first( undefined, 1 ); // $ExpectError
first( 5, 1 ); // $ExpectError
first( [], 1 ); // $ExpectError
first( {}, 1 ); // $ExpectError
first( ( x: number ): number => x, 1 ); // $ExpectError
}
// The compiler throws an error if the function is provided a second argument that is not a number...
{
first( 'abc', true ); // $ExpectError
first( 'abc', false ); // $ExpectError
first( 'abc', null ); // $ExpectError
first( 'abc', 'abc' ); // $ExpectError
first( 'abc', [] ); // $ExpectError
first( 'abc', {} ); // $ExpectError
first( 'abc', ( x: number ): number => x ); // $ExpectError
}
// The compiler throws an error if the function is provided an unsupported number of arguments...
{
first(); // $ExpectError
first( 'abc' ); // $ExpectError
first( 'abc', 1, 2 ); // $ExpectError
}