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.