typeforce/native.js

Another biased type checking solution for Javascript

var types = {
  Array: function (value) { return value !== null && value !== undefined && value.constructor === Array },
  Boolean: function (value) { return typeof value === 'boolean' },
  Function: function (value) { return typeof value === 'function' },
  Null: function (value) { return value === undefined || value === null },
  Number: function (value) { return typeof value === 'number' },
  Object: function (value) { return typeof value === 'object' },
  String: function (value) { return typeof value === 'string' },
  '': function () { return true }
}

for (var typeName in types) {
  types[typeName].toJSON = function (t) {
    return t
  }.bind(null, typeName)
}

module.exports = types