add some packages

node_modules/babel-plugin-minify-flip-comparisons/lib/index.js

@@ -0,0 +1,61 @@
+"use strict";
+
+module.exports = function ({
+  types: t
+}) {
+  const isVoid0 = require("babel-helper-is-void-0")(t);
+
+  return {
+    name: "minify-flip-comparisons",
+    visitor: {
+      // flip comparisons with a pure right hand value, this ensures
+      // consistency with comparisons and increases the length of
+      // strings that gzip can match
+      // typeof blah === 'function' -> 'function' === typeof blah
+      BinaryExpression(path) {
+        const node = path.node;
+        const right = node.right,
+              left = node.left; // Make sure we have a constant on the right.
+
+        if (!t.isLiteral(right) && !isVoid0(right) && !(t.isUnaryExpression(right) && t.isLiteral(right.argument)) && !t.isObjectExpression(right) && !t.isArrayExpression(right)) {
+          return;
+        } // Commutative operators.
+
+
+        if (t.EQUALITY_BINARY_OPERATORS.indexOf(node.operator) >= 0 || ["*", "^", "&", "|"].indexOf(node.operator) >= 0) {
+          node.left = right;
+          node.right = left;
+          return;
+        }
+
+        if (t.BOOLEAN_NUMBER_BINARY_OPERATORS.indexOf(node.operator) >= 0) {
+          node.left = right;
+          node.right = left;
+          let operator;
+
+          switch (node.operator) {
+            case ">":
+              operator = "<";
+              break;
+
+            case "<":
+              operator = ">";
+              break;
+
+            case ">=":
+              operator = "<=";
+              break;
+
+            case "<=":
+              operator = ">=";
+              break;
+          }
+
+          node.operator = operator;
+          return;
+        }
+      }
+
+    }
+  };
+};