Since nodejs/node@08085c49b6, which will be part of Node.js v6.0, functions from the `path` core module (like `dirname`) will require their input to be a string. Currently, at some points in the code they might be called with `undefined`; This patch adds `… || ""` so that the input is always a string. For `path.dirname` in the babel-core file, this does not change behaviour, since `path.dirname(undefined) === path.dirname("") === "."` (where the first expression is only defined for Node.js ≤ v5.x). For `path.basename`, this changes the return value, since `path.basename(undefined) === "undefined"` (on Node.js ≤ v5.x), but `path.basename("") === ""`. However, it seems reasonable to assume that, due to the trailing expression in `path.basename(…) || "stdout"`, the current behaviour is not actually the intended one. There are possibly more places in the code base where similar changes may be neccessary; However, these suffice to make the tests pass and un-break the build of at least one external project when using the current Node.js master branch.
babel-cli
Babel command line.
Install
$ npm install babel-cli
Usage
$ babel script.js
For more in depth documentation see: http://babeljs.io/docs/usage/cli/