60 lines
2.0 KiB
Markdown
60 lines
2.0 KiB
Markdown
# node-environment-flags
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> Polyfill/shim for `process.allowedNodeEnvironmentFlags`
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[](https://github.com/semantic-release/semantic-release)
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**node-environment-flags** is a *rough* polyfill and shim for [process.allowedNodeEnvironmentFlags](https://nodejs.org/api/process.html#process_process_allowednodeenvironmentflags), which was introduced in Node.js v10.10.0.
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## Table of Contents
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- [Install](#install)
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- [Usage](#usage)
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- [Maintainers](#maintainers)
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- [Contribute](#contribute)
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- [License](#license)
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## Install
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*Requires Node.js v6.0.0 or newer.*
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```shell
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$ npm i node-environment-flags
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```
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## Usage
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If the current Node.js version is v10.10.0 or newer, the native implementation will be provided instead.
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### As Polyfill (Recommended)
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```js
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const nodeEnvironmentFlags = require('node-environment-flags');
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nodeEnvironmentFlags.has('--require'); // true
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```
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### As Shim
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```js
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require('node-environment-flags/shim')();
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process.allowedNodeEnvironmentFlags.has('--require'); // true
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```
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## Notes
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- This module approximates what `process.allowedNodeEnvironmentFlags` provides in versions of Node.js prior to v10.10.0. Since `process.allowedNodeEnvironmentFlags` is based on [`NODE_OPTIONS`](https://nodejs.org/api/cli.html#cli_node_options_options) (introduced in v8.0.0), the set of supported flags for versions older than v8.0.0 is *highly theoretical*.
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- Version ranges are matched using [semver](https://npm.im/semver).
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- This module is granular to the *minor* Node.js version number; *patch* version numbers are not considered.
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- Results for unmaintained (odd) versions of Node.js are based on data for the most recent LTS version; e.g., running this module against Node.js v7.10.0 will yield the same results as would v6.14.0.
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- Prior art: @ljharb's [util.promisify](https://npm.im/util.promisify)
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## Maintainers
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[@boneskull](https://github.com/boneskull)
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## License
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Copyright © 2018 Christopher Hiller. Licensed Apache-2.0.
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