1 files changed, 133 insertions, 0 deletions
diff --git a/node_modules/@babel/plugin-transform-block-scoping/lib/validation.js b/node_modules/@babel/plugin-transform-block-scoping/lib/validation.js
new file mode 100644
index 00000000..3985a42b
--- /dev/null
+++ b/node_modules/@babel/plugin-transform-block-scoping/lib/validation.js
@@ -0,0 +1,133 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.validateUsage = validateUsage;
+var _core = require("@babel/core");
+function validateUsage(path, state, tdzEnabled) {
+  const dynamicTDZNames = [];
+  for (const name of Object.keys(path.getBindingIdentifiers())) {
+    const binding = path.scope.getBinding(name);
+    if (!binding) continue;
+    if (tdzEnabled) {
+      if (injectTDZChecks(binding, state)) dynamicTDZNames.push(name);
+    }
+    if (path.node.kind === "const") {
+      disallowConstantViolations(name, binding, state);
+    }
+  }
+  return dynamicTDZNames;
+}
+function disallowConstantViolations(name, binding, state) {
+  for (const violation of binding.constantViolations) {
+    const readOnlyError = state.addHelper("readOnlyError");
+    const throwNode = _core.types.callExpression(readOnlyError, [_core.types.stringLiteral(name)]);
+    if (violation.isAssignmentExpression()) {
+      const {
+        operator,
+        left,
+        right
+      } = violation.node;
+      if (operator === "=") {
+        const exprs = [right];
+        exprs.push(throwNode);
+        violation.replaceWith(_core.types.sequenceExpression(exprs));
+      } else if (["&&=", "||=", "??="].includes(operator)) {
+        violation.replaceWith(_core.types.logicalExpression(operator.slice(0, -1), left, _core.types.sequenceExpression([right, throwNode])));
+      } else {
+        violation.replaceWith(_core.types.sequenceExpression([_core.types.binaryExpression(operator.slice(0, -1), left, right), throwNode]));
+      }
+    } else if (violation.isUpdateExpression()) {
+      violation.replaceWith(_core.types.sequenceExpression([_core.types.unaryExpression("+", violation.get("argument").node), throwNode]));
+    } else if (violation.isForXStatement()) {
+      violation.ensureBlock();
+      violation.get("left").replaceWith(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(violation.scope.generateUidIdentifier(name))]));
+      violation.node.body.body.unshift(_core.types.expressionStatement(throwNode));
+    }
+  }
+}
+function getTDZStatus(refPath, bindingPath) {
+  const executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
+  if (executionStatus === "before") {
+    return "outside";
+  } else if (executionStatus === "after") {
+    return "inside";
+  } else {
+    return "maybe";
+  }
+}
+const skipTDZChecks = new WeakSet();
+function buildTDZAssert(status, node, state) {
+  if (status === "maybe") {
+    const clone = _core.types.cloneNode(node);
+    skipTDZChecks.add(clone);
+    return _core.types.callExpression(state.addHelper("temporalRef"), [clone, _core.types.stringLiteral(node.name)]);
+  } else {
+    return _core.types.callExpression(state.addHelper("tdz"), [_core.types.stringLiteral(node.name)]);
+  }
+}
+function getTDZReplacement(path, state, id = path.node) {
+  var _path$scope$getBindin;
+  if (skipTDZChecks.has(id)) return;
+  skipTDZChecks.add(id);
+  const bindingPath = (_path$scope$getBindin = path.scope.getBinding(id.name)) == null ? void 0 : _path$scope$getBindin.path;
+  if (!bindingPath || bindingPath.isFunctionDeclaration()) return;
+  const status = getTDZStatus(path, bindingPath);
+  if (status === "outside") return;
+  if (status === "maybe") {
+    bindingPath.parent._tdzThis = true;
+  }
+  return {
+    status,
+    node: buildTDZAssert(status, id, state)
+  };
+}
+function injectTDZChecks(binding, state) {
+  const allUsages = new Set(binding.referencePaths);
+  binding.constantViolations.forEach(allUsages.add, allUsages);
+  let dynamicTdz = false;
+  for (const path of binding.constantViolations) {
+    const {
+      node
+    } = path;
+    if (skipTDZChecks.has(node)) continue;
+    skipTDZChecks.add(node);
+    if (path.isUpdateExpression()) {
+      const arg = path.get("argument");
+      const replacement = getTDZReplacement(path, state, arg.node);
+      if (!replacement) continue;
+      if (replacement.status === "maybe") {
+        dynamicTdz = true;
+        path.insertBefore(replacement.node);
+      } else {
+        path.replaceWith(replacement.node);
+      }
+    } else if (path.isAssignmentExpression()) {
+      const nodes = [];
+      const ids = path.getBindingIdentifiers();
+      for (const name of Object.keys(ids)) {
+        const replacement = getTDZReplacement(path, state, ids[name]);
+        if (replacement) {
+          nodes.push(_core.types.expressionStatement(replacement.node));
+          if (replacement.status === "inside") break;
+          if (replacement.status === "maybe") dynamicTdz = true;
+        }
+      }
+      if (nodes.length > 0) path.insertBefore(nodes);
+    }
+  }
+  for (const path of binding.referencePaths) {
+    if (path.parentPath.isUpdateExpression()) continue;
+    if (path.parentPath.isFor({
+      left: path.node
+    })) continue;
+    const replacement = getTDZReplacement(path, state);
+    if (!replacement) continue;
+    if (replacement.status === "maybe") dynamicTdz = true;
+    path.replaceWith(replacement.node);
+  }
+  return dynamicTdz;
+}
+
+//# sourceMappingURL=validation.js.map