128 lines
2.4 KiB
Markdown
128 lines
2.4 KiB
Markdown
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<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# Async/Await Support
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> Detect native [`async`][mdn-async]/[`await`][mdn-await] support.
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<section class="usage">
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## Usage
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```javascript
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var hasAsyncAwaitSupport = require( '@stdlib/assert/has-async-await-support' );
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```
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#### hasAsyncAwaitSupport()
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Detects if a runtime environment supports ES2017 [`async`][mdn-async]/[`await`][mdn-await].
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```javascript
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var bool = hasAsyncAwaitSupport();
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// returns <boolean>
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- The implementation uses code evaluation, which may be problematic in browser contexts enforcing a strict [content security policy][mdn-csp] (CSP).
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var hasAsyncAwaitSupport = require( '@stdlib/assert/has-async-await-support' );
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var bool = hasAsyncAwaitSupport();
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if ( bool ) {
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console.log( 'Environment has native async/await support.' );
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} else {
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console.log( 'Environment lacks native async/await support.' );
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}
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```
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</section>
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<!-- /.examples -->
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* * *
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<section class="cli">
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## CLI
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<section class="usage">
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### Usage
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```text
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Usage: has-async-await-support [options]
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Options:
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-h, --help Print this message.
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-V, --version Print the package version.
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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### Examples
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```bash
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$ has-async-await-support
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<boolean>
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.cli -->
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<section class="links">
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[mdn-async]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function
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[mdn-await]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await
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[mdn-csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
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</section>
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<!-- /.links -->
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