0.2.0 - Mid migration

web/node_modules/@babel/plugin-proposal-nullish-coalescing-operator/lib/index.js

@@ -0,0 +1,59 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+
+var _pluginSyntaxNullishCoalescingOperator = require("@babel/plugin-syntax-nullish-coalescing-operator");
+
+var _core = require("@babel/core");
+
+var _default = (0, _helperPluginUtils.declare)((api, {
+  loose = false
+}) => {
+  var _api$assumption;
+
+  api.assertVersion(7);
+  const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose;
+  return {
+    name: "proposal-nullish-coalescing-operator",
+    inherits: _pluginSyntaxNullishCoalescingOperator.default,
+    visitor: {
+      LogicalExpression(path) {
+        const {
+          node,
+          scope
+        } = path;
+
+        if (node.operator !== "??") {
+          return;
+        }
+
+        let ref;
+        let assignment;
+
+        if (scope.isStatic(node.left)) {
+          ref = node.left;
+          assignment = _core.types.cloneNode(node.left);
+        } else if (scope.path.isPattern()) {
+          path.replaceWith(_core.template.ast`(() => ${path.node})()`);
+          return;
+        } else {
+          ref = scope.generateUidIdentifierBasedOnNode(node.left);
+          scope.push({
+            id: _core.types.cloneNode(ref)
+          });
+          assignment = _core.types.assignmentExpression("=", ref, node.left);
+        }
+
+        path.replaceWith(_core.types.conditionalExpression(noDocumentAll ? _core.types.binaryExpression("!=", assignment, _core.types.nullLiteral()) : _core.types.logicalExpression("&&", _core.types.binaryExpression("!==", assignment, _core.types.nullLiteral()), _core.types.binaryExpression("!==", _core.types.cloneNode(ref), scope.buildUndefinedNode())), _core.types.cloneNode(ref), node.right));
+      }
+
+    }
+  };
+});
+
+exports.default = _default;