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An open-source, although still incomplete, e-book on Node.js by TJ Holowaychuk was originally written with the help of markdown files on GitHub and was later converted into more convenient formats, mainly pdf, mobi, epub, and html. Despite a sufficient lack of material, the book does present important concepts of Node, several installation methods, primary components, and the Node.js file system. The author actively encourages programmers concerned with the topic for the contribution to his project and hopes that Mastering node.js will someday be finished. Nevertheless, the book is still a good source of basic knowledge of Node.js environment.