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frontend/node_modules/underscore/modules/matcher.js

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+import extendOwn from './extendOwn.js';
+import isMatch from './isMatch.js';
+
+// Returns a predicate for checking whether an object has a given set of
+// `key:value` pairs.
+export default function matcher(attrs) {
+  attrs = extendOwn({}, attrs);
+  return function(obj) {
+    return isMatch(obj, attrs);
+  };
+}