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node_modules/image-size/lib/detector.js

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+'use strict';
+
+var typeMap = {};
+var types = require('./types');
+
+// load all available handlers
+types.forEach(function (type) {
+  typeMap[type] = require('./types/' + type).detect;
+});
+
+module.exports = function (buffer, filepath) {
+  var type, result;
+  for (type in typeMap) {
+    result = typeMap[type](buffer, filepath);
+    if (result) {
+      return type;
+    }
+  }
+};