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# Node.js Language Pack | ||
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The Node.js Language Pack will run `npm install` on your app after setting | ||
up an appropriate environment of [node](http://github.com/joyent/node), | ||
[npm](https://github.com/isaacs/npm) and [SCons](http://www.scons.org). | ||
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## Vendored Libraries | ||
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The versions of node, npm and SCons used by the language pack are controlled | ||
by the constants `NODE_VERSION`, `NPM_VERSION`, and `SCONS_VERSION` in | ||
`bin/compile` | ||
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To use different versions of these tools, you can use the helper scripts | ||
`support/package_node` and `support/package_npm`. These support scripts will | ||
create binary tarballs that can be referenced by `bin/compile`. |