app/node_modules/markdown-it-imsize/lib/imsize/detector.js

'use strict';

var typeMap = {};
var types = require('./types');

types.forEach(function(type) {
  typeMap[type] = require('./types/' + type).detect;
});

module.exports = function(buffer, filepath) {
  var type, result;
  for (type in typeMap) {
    if (type in typeMap) {
      result = typeMap[type](buffer, filepath);
      if (result) {
        return type;
      }
    }
  }
  throw new TypeError('Unsupported type');
};