add some packages

node_modules/babel-plugin-minify-guarded-expressions/lib/index.js

@@ -0,0 +1,73 @@
+"use strict";
+
+module.exports = function ({
+  types: t
+}) {
+  const flipExpressions = require("babel-helper-flip-expressions")(t);
+
+  return {
+    name: "minify-guarded-expressions",
+    visitor: {
+      // Convert guarded expressions
+      // !a && b() --> a || b();
+      // This could change the return result of the expression so we only do it
+      // on things where the result is ignored.
+      LogicalExpression: {
+        enter: [function (path) {
+          const node = path.node;
+          const left = path.get("left");
+          const right = path.get("right"); // issues - 171, 174, 176
+          // we assume that it is returned/assigned/part of a bigger expression
+          // or utilized somehow
+          // we check if we shouldBail only when evaluating
+          // the rightside of the expression;
+          // if the left side is evaluated to be deterministic,
+          // we can safely replace the entire expression
+
+          const shouldBail = !path.parentPath.isExpressionStatement();
+
+          if (node.operator === "&&") {
+            const leftTruthy = left.evaluateTruthy();
+
+            if (leftTruthy === false) {
+              // Short-circuit
+              path.replaceWith(node.left);
+            } else if (leftTruthy === true && left.isPure()) {
+              path.replaceWith(node.right);
+            } else if (right.evaluateTruthy() === false && right.isPure() && !shouldBail) {
+              path.replaceWith(node.left);
+            }
+          } else if (node.operator === "||") {
+            const leftTruthy = left.evaluateTruthy();
+
+            if (leftTruthy === false && left.isPure()) {
+              path.replaceWith(node.right);
+            } else if (leftTruthy === true) {
+              // Short-circuit
+              path.replaceWith(node.left);
+            } else if (right.evaluateTruthy() === false && right.isPure() && !shouldBail) {
+              path.replaceWith(node.left);
+            }
+          }
+        }, function (path) {
+          const node = path.node;
+
+          if (flipExpressions.hasSeen(node)) {
+            return;
+          }
+
+          if (!path.parentPath.isExpressionStatement() && !(path.parentPath.isSequenceExpression() && path.parentPath.parentPath.isExpressionStatement())) {
+            return;
+          } // Start counting savings from one since we can ignore the last
+          // expression.
+
+
+          if (flipExpressions.shouldFlip(node, 1)) {
+            const newNode = flipExpressions.flip(node, true);
+            path.replaceWith(newNode);
+          }
+        }]
+      }
+    }
+  };
+};