1 files changed, 185 insertions, 0 deletions
diff --git a/node_modules/@babel/plugin-transform-block-scoping/lib/index.js b/node_modules/@babel/plugin-transform-block-scoping/lib/index.js
new file mode 100644
index 00000000..6014ff65
--- /dev/null
+++ b/node_modules/@babel/plugin-transform-block-scoping/lib/index.js
@@ -0,0 +1,185 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+var _core = require("@babel/core");
+var _loop = require("./loop.js");
+var _validation = require("./validation.js");
+var _annexB_3_ = require("./annex-B_3_3.js");
+var _default = (0, _helperPluginUtils.declare)((api, opts) => {
+  api.assertVersion(7);
+  const {
+    throwIfClosureRequired = false,
+    tdz: tdzEnabled = false
+  } = opts;
+  if (typeof throwIfClosureRequired !== "boolean") {
+    throw new Error(`.throwIfClosureRequired must be a boolean, or undefined`);
+  }
+  if (typeof tdzEnabled !== "boolean") {
+    throw new Error(`.tdz must be a boolean, or undefined`);
+  }
+  return {
+    name: "transform-block-scoping",
+    visitor: _core.traverse.visitors.merge([_annexB_3_.annexB33FunctionsVisitor, {
+      Loop(path, state) {
+        const isForStatement = path.isForStatement();
+        const headPath = isForStatement ? path.get("init") : path.isForXStatement() ? path.get("left") : null;
+        let needsBodyWrap = false;
+        const markNeedsBodyWrap = () => {
+          if (throwIfClosureRequired) {
+            throw path.buildCodeFrameError("Compiling let/const in this block would add a closure " + "(throwIfClosureRequired).");
+          }
+          needsBodyWrap = true;
+        };
+        const body = path.get("body");
+        let bodyScope;
+        if (body.isBlockStatement()) {
+          bodyScope = body.scope;
+          const bindings = (0, _loop.getLoopBodyBindings)(path);
+          for (const binding of bindings) {
+            const {
+              capturedInClosure
+            } = (0, _loop.getUsageInBody)(binding, path);
+            if (capturedInClosure) markNeedsBodyWrap();
+          }
+        }
+        const captured = [];
+        const updatedBindingsUsages = new Map();
+        if (headPath && isBlockScoped(headPath.node)) {
+          const names = Object.keys(headPath.getBindingIdentifiers());
+          const headScope = headPath.scope;
+          for (let name of names) {
+            var _bodyScope;
+            if ((_bodyScope = bodyScope) != null && _bodyScope.hasOwnBinding(name)) continue;
+            let binding = headScope.getOwnBinding(name);
+            if (!binding) {
+              headScope.crawl();
+              binding = headScope.getOwnBinding(name);
+            }
+            const {
+              usages,
+              capturedInClosure,
+              hasConstantViolations
+            } = (0, _loop.getUsageInBody)(binding, path);
+            if (headScope.parent.hasBinding(name) || headScope.parent.hasGlobal(name)) {
+              const newName = headScope.generateUid(name);
+              headScope.rename(name, newName);
+              name = newName;
+            }
+            if (capturedInClosure) {
+              markNeedsBodyWrap();
+              captured.push(name);
+            }
+            if (isForStatement && hasConstantViolations) {
+              updatedBindingsUsages.set(name, usages);
+            }
+          }
+        }
+        if (needsBodyWrap) {
+          const varPath = (0, _loop.wrapLoopBody)(path, captured, updatedBindingsUsages);
+          if (headPath != null && headPath.isVariableDeclaration()) {
+            transformBlockScopedVariable(headPath, state, tdzEnabled);
+          }
+          varPath.get("declarations.0.init").unwrapFunctionEnvironment();
+        }
+      },
+      VariableDeclaration(path, state) {
+        transformBlockScopedVariable(path, state, tdzEnabled);
+      },
+      ClassDeclaration(path) {
+        const {
+          id
+        } = path.node;
+        if (!id) return;
+        const {
+          scope
+        } = path.parentPath;
+        if (!(0, _annexB_3_.isVarScope)(scope) && scope.parent.hasBinding(id.name, {
+          noUids: true
+        })) {
+          path.scope.rename(id.name);
+        }
+      }
+    }])
+  };
+});
+exports.default = _default;
+const conflictingFunctionsVisitor = {
+  Scope(path, {
+    names
+  }) {
+    for (const name of names) {
+      const binding = path.scope.getOwnBinding(name);
+      if (binding && binding.kind === "hoisted") {
+        path.scope.rename(name);
+      }
+    }
+  },
+  "Expression|Declaration"(path) {
+    path.skip();
+  }
+};
+function transformBlockScopedVariable(path, state, tdzEnabled) {
+  if (!isBlockScoped(path.node)) return;
+  const dynamicTDZNames = (0, _validation.validateUsage)(path, state, tdzEnabled);
+  path.node.kind = "var";
+  const bindingNames = Object.keys(path.getBindingIdentifiers());
+  for (const name of bindingNames) {
+    const binding = path.scope.getOwnBinding(name);
+    if (!binding) continue;
+    binding.kind = "var";
+  }
+  if (isInLoop(path) && !(0, _loop.isVarInLoopHead)(path) || dynamicTDZNames.length > 0) {
+    for (const decl of path.node.declarations) {
+      var _decl$init;
+      (_decl$init = decl.init) != null ? _decl$init : decl.init = path.scope.buildUndefinedNode();
+    }
+  }
+  const blockScope = path.scope;
+  const varScope = blockScope.getFunctionParent() || blockScope.getProgramParent();
+  if (varScope !== blockScope) {
+    for (const name of bindingNames) {
+      let newName = name;
+      if (blockScope.parent.hasBinding(name, {
+        noUids: true
+      }) || blockScope.parent.hasGlobal(name)) {
+        newName = blockScope.generateUid(name);
+        blockScope.rename(name, newName);
+      }
+      blockScope.moveBindingTo(newName, varScope);
+    }
+  }
+  blockScope.path.traverse(conflictingFunctionsVisitor, {
+    names: bindingNames
+  });
+  for (const name of dynamicTDZNames) {
+    path.scope.push({
+      id: _core.types.identifier(name),
+      init: state.addHelper("temporalUndefined")
+    });
+  }
+}
+function isLetOrConst(kind) {
+  return kind === "let" || kind === "const";
+}
+function isInLoop(path) {
+  if (!path.parentPath) return false;
+  if (path.parentPath.isLoop()) return true;
+  if (path.parentPath.isFunctionParent()) return false;
+  return isInLoop(path.parentPath);
+}
+function isBlockScoped(node) {
+  if (!_core.types.isVariableDeclaration(node)) return false;
+  if (node[_core.types.BLOCK_SCOPED_SYMBOL]) {
+    return true;
+  }
+  if (!isLetOrConst(node.kind) && node.kind !== "using") {
+    return false;
+  }
+  return true;
+}
+
+//# sourceMappingURL=index.js.map