1 files changed, 97 insertions, 0 deletions
diff --git a/node_modules/babel-plugin-transform-es2015-block-scoping/lib/tdz.js b/node_modules/babel-plugin-transform-es2015-block-scoping/lib/tdz.js
new file mode 100644
index 0000000..9137fed
--- /dev/null
+++ b/node_modules/babel-plugin-transform-es2015-block-scoping/lib/tdz.js
@@ -0,0 +1,97 @@
+"use strict";
+
+exports.__esModule = true;
+exports.visitor = undefined;
+
+var _babelTypes = require("babel-types");
+
+var t = _interopRequireWildcard(_babelTypes);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function getTDZStatus(refPath, bindingPath) {
+  var executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
+
+  if (executionStatus === "before") {
+    return "inside";
+  } else if (executionStatus === "after") {
+    return "outside";
+  } else {
+    return "maybe";
+  }
+}
+
+function buildTDZAssert(node, file) {
+  return t.callExpression(file.addHelper("temporalRef"), [node, t.stringLiteral(node.name), file.addHelper("temporalUndefined")]);
+}
+
+function isReference(node, scope, state) {
+  var declared = state.letReferences[node.name];
+  if (!declared) return false;
+
+  return scope.getBindingIdentifier(node.name) === declared;
+}
+
+var visitor = exports.visitor = {
+  ReferencedIdentifier: function ReferencedIdentifier(path, state) {
+    if (!this.file.opts.tdz) return;
+
+    var node = path.node,
+        parent = path.parent,
+        scope = path.scope;
+
+
+    if (path.parentPath.isFor({ left: node })) return;
+    if (!isReference(node, scope, state)) return;
+
+    var bindingPath = scope.getBinding(node.name).path;
+
+    var status = getTDZStatus(path, bindingPath);
+    if (status === "inside") return;
+
+    if (status === "maybe") {
+      var assert = buildTDZAssert(node, state.file);
+
+      bindingPath.parent._tdzThis = true;
+
+      path.skip();
+
+      if (path.parentPath.isUpdateExpression()) {
+        if (parent._ignoreBlockScopingTDZ) return;
+        path.parentPath.replaceWith(t.sequenceExpression([assert, parent]));
+      } else {
+        path.replaceWith(assert);
+      }
+    } else if (status === "outside") {
+      path.replaceWith(t.throwStatement(t.inherits(t.newExpression(t.identifier("ReferenceError"), [t.stringLiteral(node.name + " is not defined - temporal dead zone")]), node)));
+    }
+  },
+
+
+  AssignmentExpression: {
+    exit: function exit(path, state) {
+      if (!this.file.opts.tdz) return;
+
+      var node = path.node;
+
+      if (node._ignoreBlockScopingTDZ) return;
+
+      var nodes = [];
+      var ids = path.getBindingIdentifiers();
+
+      for (var name in ids) {
+        var id = ids[name];
+
+        if (isReference(id, path.scope, state)) {
+          nodes.push(buildTDZAssert(id, state.file));
+        }
+      }
+
+      if (nodes.length) {
+        node._ignoreBlockScopingTDZ = true;
+        nodes.push(node);
+        path.replaceWithMultiple(nodes.map(t.expressionStatement));
+      }
+    }
+  }
+};
+\ No newline at end of file