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# babel-plugin-dev-expression [](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.
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