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MIT License
Copyright (c) 2014-present Sebastian McKenzie and other contributors
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# @babel/plugin-transform-block-scoping
> Compile ES2015 block scoping (const and let) to ES5
See our website [@babel/plugin-transform-block-scoping](https://babeljs.io/docs/en/babel-plugin-transform-block-scoping) for more information.
## Install
Using npm:
```sh
npm install --save-dev @babel/plugin-transform-block-scoping
```
or using yarn:
```sh
yarn add @babel/plugin-transform-block-scoping --dev
```

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.visitor = void 0;
var _core = require("@babel/core");
function getTDZStatus(refPath, bindingPath) {
const executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
if (executionStatus === "before") {
return "outside";
} else if (executionStatus === "after") {
return "inside";
} else {
return "maybe";
}
}
function buildTDZAssert(node, state) {
return _core.types.callExpression(state.addHelper("temporalRef"), [node, _core.types.stringLiteral(node.name)]);
}
function isReference(node, scope, state) {
const declared = state.letReferences.get(node.name);
if (!declared) return false;
return scope.getBindingIdentifier(node.name) === declared;
}
const visitedMaybeTDZNodes = new WeakSet();
const visitor = {
ReferencedIdentifier(path, state) {
if (!state.tdzEnabled) return;
const {
node,
parent,
scope
} = path;
if (path.parentPath.isFor({
left: node
})) return;
if (!isReference(node, scope, state)) return;
const bindingPath = scope.getBinding(node.name).path;
if (bindingPath.isFunctionDeclaration()) return;
const status = getTDZStatus(path, bindingPath);
if (status === "outside") return;
if (status === "maybe") {
if (visitedMaybeTDZNodes.has(node)) {
return;
}
visitedMaybeTDZNodes.add(node);
const assert = buildTDZAssert(node, state);
bindingPath.parent._tdzThis = true;
if (path.parentPath.isUpdateExpression()) {
if (parent._ignoreBlockScopingTDZ) return;
path.parentPath.replaceWith(_core.types.sequenceExpression([assert, parent]));
} else {
path.replaceWith(assert);
}
} else if (status === "inside") {
path.replaceWith(_core.template.ast`${state.addHelper("tdz")}("${node.name}")`);
}
},
AssignmentExpression: {
exit(path, state) {
if (!state.tdzEnabled) return;
const {
node
} = path;
if (node._ignoreBlockScopingTDZ) return;
const nodes = [];
const ids = path.getBindingIdentifiers();
for (const name of Object.keys(ids)) {
const id = ids[name];
if (isReference(id, path.scope, state)) {
nodes.push(id);
}
}
if (nodes.length) {
node._ignoreBlockScopingTDZ = true;
nodes.push(node);
path.replaceWithMultiple(nodes.map(n => _core.types.expressionStatement(n)));
}
}
}
};
exports.visitor = visitor;

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{
"name": "@babel/plugin-transform-block-scoping",
"version": "7.18.9",
"description": "Compile ES2015 block scoping (const and let) to ES5",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-transform-block-scoping"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-block-scoping",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"dependencies": {
"@babel/helper-plugin-utils": "^7.18.9"
},
"keywords": [
"babel-plugin"
],
"peerDependencies": {
"@babel/core": "^7.0.0-0"
},
"devDependencies": {
"@babel/core": "^7.18.9",
"@babel/helper-plugin-test-runner": "^7.18.6",
"@babel/traverse": "^7.18.9"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"type": "commonjs"
}