https://github.com/4catalyzer/babel-plugin-dev-expression

A mirror of Facebook's dev-expression Babel plugin
https://github.com/4catalyzer/babel-plugin-dev-expression

Last synced: about 20 hours ago
JSON representation

A mirror of Facebook's dev-expression Babel plugin

• Host: GitHub
• URL: https://github.com/4catalyzer/babel-plugin-dev-expression
• Owner: 4Catalyzer
• License: mit
• Created: 2015-11-02T19:17:35.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2024-12-04T18:10:02.000Z (18 days ago)
• Last Synced: 2024-12-15T02:02:19.885Z (8 days ago)
• Language: JavaScript
• Size: 323 KB
• Stars: 184
• Watchers: 7
• Forks: 6
• Open Issues: 24
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# babel-plugin-dev-expression [![npm version](https://badge.fury.io/js/babel-plugin-dev-expression.svg)](https://badge.fury.io/js/babel-plugin-dev-expression)

A mirror of Facebook's dev-expression Babel plugin.

This plugin reduces or eliminates development checks from production code.

## `__DEV__`

Replaces

```js

__DEV__

```

with

```js

process.env.NODE_ENV !== 'production'

```

**Note:** The `dev-expression` transform does not run when `NODE_ENV` is `test`. As such, if you use `__DEV__`, you will need to define it as a global constant in your test environment.

## `invariant`

Replaces

```js

invariant(condition, argument, argument);

```

with

```js

if (!condition) {

  if ("production" !== process.env.NODE_ENV) {

    invariant(false, argument, argument);

  } else {

    invariant(false);

  }

}

```

Recommended for use with https://github.com/zertosh/invariant or smaller https://github.com/alexreardon/tiny-invariant.

## `warning`

Replaces

```js

warning(condition, argument, argument);

```

with

```js

if ("production" !== process.env.NODE_ENV) {

  warning(condition, argument, argument);

}

```

Recommended for use with https://github.com/r3dm/warning or smaller https://github.com/alexreardon/tiny-warning.