babel-plugin-web-dev-expression

A browser compatible fork of Facebook's dev-expression Babel plugin.

This plugin reduces or eliminates development checks from production code, but also works in a browser environment. It defaults to a production environment in a browser.

__DEV__

Replaces

__DEV__

with

typeof process != "object" ? false : !process.env ? false : 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

invariant(condition, argument, argument);

with

if (!condition) {
  if (typeof process != "object" ? false : !process.env ? false : process.env.NODE_ENV !== "production") {
    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

warning(condition, argument, argument);

with

if (typeof process != "object" ? false : !process.env ? false : process.env.NODE_ENV !== "production") {
  warning(condition, argument, argument);
}

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