README.md (2420B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2018 The Stdlib Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 --> 20 21 # Async/Await Support 22 23 > Detect native [`async`][mdn-async]/[`await`][mdn-await] support. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var hasAsyncAwaitSupport = require( '@stdlib/assert/has-async-await-support' ); 31 ``` 32 33 #### hasAsyncAwaitSupport() 34 35 Detects if a runtime environment supports ES2017 [`async`][mdn-async]/[`await`][mdn-await]. 36 37 ```javascript 38 var bool = hasAsyncAwaitSupport(); 39 // returns <boolean> 40 ``` 41 42 </section> 43 44 <!-- /.usage --> 45 46 <section class="notes"> 47 48 ## Notes 49 50 - The implementation uses code evaluation, which may be problematic in browser contexts enforcing a strict [content security policy][mdn-csp] (CSP). 51 52 </section> 53 54 <!-- /.notes --> 55 56 <section class="examples"> 57 58 ## Examples 59 60 <!-- eslint no-undef: "error" --> 61 62 ```javascript 63 var hasAsyncAwaitSupport = require( '@stdlib/assert/has-async-await-support' ); 64 65 var bool = hasAsyncAwaitSupport(); 66 if ( bool ) { 67 console.log( 'Environment has native async/await support.' ); 68 } else { 69 console.log( 'Environment lacks native async/await support.' ); 70 } 71 ``` 72 73 </section> 74 75 <!-- /.examples --> 76 77 * * * 78 79 <section class="cli"> 80 81 ## CLI 82 83 <section class="usage"> 84 85 ### Usage 86 87 ```text 88 Usage: has-async-await-support [options] 89 90 Options: 91 92 -h, --help Print this message. 93 -V, --version Print the package version. 94 ``` 95 96 </section> 97 98 <!-- /.usage --> 99 100 <section class="examples"> 101 102 ### Examples 103 104 ```bash 105 $ has-async-await-support 106 <boolean> 107 ``` 108 109 </section> 110 111 <!-- /.examples --> 112 113 </section> 114 115 <!-- /.cli --> 116 117 <section class="links"> 118 119 [mdn-async]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function 120 121 [mdn-await]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await 122 123 [mdn-csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP 124 125 </section> 126 127 <!-- /.links -->