1 files changed, 93 insertions, 0 deletions
diff --git a/node_modules/@babel/helper-simple-access/lib/index.js b/node_modules/@babel/helper-simple-access/lib/index.js
new file mode 100644
index 0000000..69bacda
--- /dev/null
+++ b/node_modules/@babel/helper-simple-access/lib/index.js
@@ -0,0 +1,93 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = simplifyAccess;
+
+var _t = require("@babel/types");
+
+const {
+  LOGICAL_OPERATORS,
+  assignmentExpression,
+  binaryExpression,
+  cloneNode,
+  identifier,
+  logicalExpression,
+  numericLiteral,
+  sequenceExpression,
+  unaryExpression
+} = _t;
+
+function simplifyAccess(path, bindingNames) {
+  path.traverse(simpleAssignmentVisitor, {
+    scope: path.scope,
+    bindingNames,
+    seen: new WeakSet()
+  });
+}
+
+const simpleAssignmentVisitor = {
+  UpdateExpression: {
+    exit(path) {
+      const {
+        scope,
+        bindingNames
+      } = this;
+      const arg = path.get("argument");
+      if (!arg.isIdentifier()) return;
+      const localName = arg.node.name;
+      if (!bindingNames.has(localName)) return;
+
+      if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
+        return;
+      }
+
+      if (path.parentPath.isExpressionStatement() && !path.isCompletionRecord()) {
+        const operator = path.node.operator == "++" ? "+=" : "-=";
+        path.replaceWith(assignmentExpression(operator, arg.node, numericLiteral(1)));
+      } else if (path.node.prefix) {
+        path.replaceWith(assignmentExpression("=", identifier(localName), binaryExpression(path.node.operator[0], unaryExpression("+", arg.node), numericLiteral(1))));
+      } else {
+        const old = path.scope.generateUidIdentifierBasedOnNode(arg.node, "old");
+        const varName = old.name;
+        path.scope.push({
+          id: old
+        });
+        const binary = binaryExpression(path.node.operator[0], identifier(varName), numericLiteral(1));
+        path.replaceWith(sequenceExpression([assignmentExpression("=", identifier(varName), unaryExpression("+", arg.node)), assignmentExpression("=", cloneNode(arg.node), binary), identifier(varName)]));
+      }
+    }
+
+  },
+  AssignmentExpression: {
+    exit(path) {
+      const {
+        scope,
+        seen,
+        bindingNames
+      } = this;
+      if (path.node.operator === "=") return;
+      if (seen.has(path.node)) return;
+      seen.add(path.node);
+      const left = path.get("left");
+      if (!left.isIdentifier()) return;
+      const localName = left.node.name;
+      if (!bindingNames.has(localName)) return;
+
+      if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
+        return;
+      }
+
+      const operator = path.node.operator.slice(0, -1);
+
+      if (LOGICAL_OPERATORS.includes(operator)) {
+        path.replaceWith(logicalExpression(operator, path.node.left, assignmentExpression("=", cloneNode(path.node.left), path.node.right)));
+      } else {
+        path.node.right = binaryExpression(operator, cloneNode(path.node.left), path.node.right);
+        path.node.operator = "=";
+      }
+    }
+
+  }
+};
+\ No newline at end of file