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Node.js body parsing middleware
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Terminal string styling done right
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yargs the modern, pirate-themed, successor to optimist.
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Recursively mkdir, like `mkdir -p`
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YAML 1.2 parser and serializer
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Higher-order functions and common patterns for asynchronous code
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The semantic version parser used by npm.
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Streams3, a user-land copy of the stream library from Node.js
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