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* Get binary path.
* If environment variable SASS_BINARY_PATH,
* .npmrc variable sass_binary_path or
* process argument --sass-binary-path is provided,
* select it by appending binary name, otherwise
* make default binary path using binary name.
* Once the primary selection is made, check if
* callers wants to throw if file not exists before
* returning.
* @param {Boolean} throwIfNotExists
* @api private
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