react-router-ga/example/node_modules/yargs/lib/middleware.js

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module.exports = function (globalMiddleware, context) {
  return function (callback) {
    if (Array.isArray(callback)) {
      Array.prototype.push.apply(globalMiddleware, callback)
    } else if (typeof callback === 'function') {
      globalMiddleware.push(callback)
    }
    return context
  }
}