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This is a Babel 6 plugin to enable extending builtin types like "Error" and "Array" and such,which require special treatment and require static analysis to detect.

In your Babel 6 configuration, for example in a.babelrc you might have

{    "plugins": [        ["babel-plugin-transform-builtin-extend", {            globals: ["Error", "Array"]        }]    ]}

which would enable the plugin and configure it to look for any class extendingError orArray globals.

On older browsers that do not support reassigning the prototype of an existing object, you will need toenable theapproximate mode, which will fall back to the Babel 5 behavior of using simple ES5 inheritanceto approximate extending a class, though your results may vary depending on your goals.

{    "plugins": [        ["babel-plugin-transform-builtin-extend", {            globals: ["Error", "Array"],            approximate: true        }]    ]}

This plugin will only reles on assigning__proto__ for static property inheritance from parent constructors.If you are relying on this, it will not work on IE<=10 and any other browsers that don't support__proto__.