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MIT License
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Copyright (c) 2014-present Sebastian McKenzie and other contributors
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# @babel/plugin-transform-explicit-resource-management
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> Compile `using` and `await using` declarations to ES2015
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See our website [@babel/plugin-transform-explicit-resource-management](https://babeljs.io/docs/babel-plugin-transform-explicit-resource-management) for more information.
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## Install
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Using npm:
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```sh
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npm install --save-dev @babel/plugin-transform-explicit-resource-management
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```
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or using yarn:
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```sh
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yarn add @babel/plugin-transform-explicit-resource-management --dev
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```
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _helperPluginUtils = require("@babel/helper-plugin-utils");
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var _pluginTransformDestructuring = require("@babel/plugin-transform-destructuring");
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var _core = require("@babel/core");
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function isAnonymousFunctionDefinition(node) {
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return _core.types.isArrowFunctionExpression(node) || (_core.types.isFunctionExpression(node) || _core.types.isClassExpression(node)) && !node.id;
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}
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function emitSetFunctionNameCall(state, expression, name) {
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return _core.types.callExpression(state.addHelper("setFunctionName"), [expression, _core.types.stringLiteral(name)]);
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}
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var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
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api.assertVersion("^7.23.9 || ^8.0.0-0 || >8.0.0-alpha <8.0.0-beta");
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const TOP_LEVEL_USING = new Map();
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function isUsingDeclaration(node) {
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if (!_core.types.isVariableDeclaration(node)) return false;
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return node.kind === "using" || node.kind === "await using" || TOP_LEVEL_USING.has(node);
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}
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const transformUsingDeclarationsVisitor = {
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ForOfStatement(path) {
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const {
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left
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} = path.node;
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if (!isUsingDeclaration(left)) return;
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const {
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id
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} = left.declarations[0];
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const tmpId = path.scope.generateUidIdentifierBasedOnNode(id);
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left.declarations[0].id = tmpId;
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left.kind = "const";
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path.ensureBlock();
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(0, _pluginTransformDestructuring.unshiftForXStatementBody)(path, [_core.types.variableDeclaration("using", [_core.types.variableDeclarator(id, _core.types.cloneNode(tmpId))])]);
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},
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"BlockStatement|StaticBlock"(path, state) {
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let ctx = null;
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let needsAwait = false;
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const scope = path.scope;
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for (const node of path.node.body) {
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if (!isUsingDeclaration(node)) continue;
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ctx != null ? ctx : ctx = scope.generateUidIdentifier("usingCtx");
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const isAwaitUsing = node.kind === "await using" || TOP_LEVEL_USING.get(node) === 1;
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needsAwait || (needsAwait = isAwaitUsing);
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if (!TOP_LEVEL_USING.delete(node)) {
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node.kind = "const";
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}
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for (const decl of node.declarations) {
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const currentInit = decl.init;
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decl.init = _core.types.callExpression(_core.types.memberExpression(_core.types.cloneNode(ctx), isAwaitUsing ? _core.types.identifier("a") : _core.types.identifier("u")), [isAnonymousFunctionDefinition(currentInit) && _core.types.isIdentifier(decl.id) ? emitSetFunctionNameCall(state, currentInit, decl.id.name) : currentInit]);
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}
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}
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if (!ctx) return;
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const disposeCall = _core.types.callExpression(_core.types.memberExpression(_core.types.cloneNode(ctx), _core.types.identifier("d")), []);
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const replacement = _core.template.statement.ast`
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try {
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var ${_core.types.cloneNode(ctx)} = ${state.addHelper("usingCtx")}();
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${path.node.body}
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} catch (_) {
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${_core.types.cloneNode(ctx)}.e = _;
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} finally {
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${needsAwait ? _core.types.awaitExpression(disposeCall) : disposeCall}
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}
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`;
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_core.types.inherits(replacement, path.node);
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const {
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parentPath
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} = path;
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if (parentPath.isFunction() || parentPath.isTryStatement() || parentPath.isCatchClause()) {
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path.replaceWith(_core.types.blockStatement([replacement]));
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} else if (path.isStaticBlock()) {
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path.node.body = [replacement];
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} else {
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path.replaceWith(replacement);
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}
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}
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};
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const transformUsingDeclarationsVisitorSkipFn = _core.traverse.visitors.merge([transformUsingDeclarationsVisitor, {
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Function(path) {
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path.skip();
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}
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}]);
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return {
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name: "transform-explicit-resource-management",
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manipulateOptions: (_, p) => p.plugins.push("explicitResourceManagement"),
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visitor: _core.traverse.visitors.merge([transformUsingDeclarationsVisitor, {
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Program(path) {
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TOP_LEVEL_USING.clear();
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if (path.node.sourceType !== "module") return;
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if (!path.node.body.some(isUsingDeclaration)) return;
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const innerBlockBody = [];
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for (const stmt of path.get("body")) {
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if (stmt.isFunctionDeclaration() || stmt.isImportDeclaration()) {
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continue;
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}
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let node = stmt.node;
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let shouldRemove = true;
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if (stmt.isExportDefaultDeclaration()) {
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let {
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declaration
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} = stmt.node;
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let varId;
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if (_core.types.isClassDeclaration(declaration)) {
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varId = declaration.id;
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declaration.id = _core.types.cloneNode(varId);
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declaration = _core.types.toExpression(declaration);
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} else if (!_core.types.isExpression(declaration)) {
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continue;
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}
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varId != null ? varId : varId = path.scope.generateUidIdentifier("_default");
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innerBlockBody.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(varId, declaration)]));
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stmt.replaceWith(_core.types.exportNamedDeclaration(null, [_core.types.exportSpecifier(_core.types.cloneNode(varId), _core.types.identifier("default"))]));
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continue;
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}
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if (stmt.isExportNamedDeclaration()) {
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node = stmt.node.declaration;
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if (!node || _core.types.isFunction(node)) continue;
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stmt.replaceWith(_core.types.exportNamedDeclaration(null, Object.keys(_core.types.getOuterBindingIdentifiers(node, false)).map(id => _core.types.exportSpecifier(_core.types.identifier(id), _core.types.identifier(id)))));
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shouldRemove = false;
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} else if (stmt.isExportDeclaration()) {
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continue;
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}
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if (_core.types.isClassDeclaration(node)) {
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const {
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id
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} = node;
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node.id = _core.types.cloneNode(id);
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innerBlockBody.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(id, _core.types.toExpression(node))]));
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} else if (_core.types.isVariableDeclaration(node)) {
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if (node.kind === "using") {
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TOP_LEVEL_USING.set(stmt.node, 0);
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} else if (node.kind === "await using") {
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TOP_LEVEL_USING.set(stmt.node, 1);
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}
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node.kind = "var";
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innerBlockBody.push(node);
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} else {
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innerBlockBody.push(stmt.node);
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}
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if (shouldRemove) stmt.remove();
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}
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path.pushContainer("body", _core.types.blockStatement(innerBlockBody));
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},
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Function(path, state) {
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if (path.node.async) {
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path.traverse(transformUsingDeclarationsVisitorSkipFn, state);
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}
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}
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}])
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};
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});
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//# sourceMappingURL=index.js.map
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Generated
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+1
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{"version":3,"names":["_helperPluginUtils","require","_pluginTransformDestructuring","_core","isAnonymousFunctionDefinition","node","t","isArrowFunctionExpression","isFunctionExpression","isClassExpression","id","emitSetFunctionNameCall","state","expression","name","callExpression","addHelper","stringLiteral","_default","exports","default","declare","api","assertVersion","TOP_LEVEL_USING","Map","isUsingDeclaration","isVariableDeclaration","kind","has","transformUsingDeclarationsVisitor","ForOfStatement","path","left","declarations","tmpId","scope","generateUidIdentifierBasedOnNode","ensureBlock","unshiftForXStatementBody","variableDeclaration","variableDeclarator","cloneNode","BlockStatement|StaticBlock","ctx","needsAwait","body","generateUidIdentifier","isAwaitUsing","get","delete","decl","currentInit","init","memberExpression","identifier","isIdentifier","disposeCall","replacement","template","statement","ast","awaitExpression","inherits","parentPath","isFunction","isTryStatement","isCatchClause","replaceWith","blockStatement","isStaticBlock","transformUsingDeclarationsVisitorSkipFn","traverse","visitors","merge","Function","skip","manipulateOptions","_","p","plugins","push","visitor","Program","clear","sourceType","some","innerBlockBody","stmt","isFunctionDeclaration","isImportDeclaration","shouldRemove","isExportDefaultDeclaration","declaration","varId","isClassDeclaration","toExpression","isExpression","exportNamedDeclaration","exportSpecifier","isExportNamedDeclaration","Object","keys","getOuterBindingIdentifiers","map","isExportDeclaration","set","remove","pushContainer","async"],"sources":["../src/index.ts"],"sourcesContent":["import { declare } from \"@babel/helper-plugin-utils\";\nimport { unshiftForXStatementBody } from \"@babel/plugin-transform-destructuring\";\nimport { types as t, template, traverse } from \"@babel/core\";\nimport type { NodePath, Visitor, PluginPass } from \"@babel/core\";\n\nconst enum USING_KIND {\n NORMAL,\n AWAIT,\n}\n\n// https://tc39.es/ecma262/#sec-isanonymousfunctiondefinition\nfunction isAnonymousFunctionDefinition(\n node: t.Node,\n): node is\n | t.ClassExpression\n | t.ArrowFunctionExpression\n | t.FunctionExpression {\n return (\n t.isArrowFunctionExpression(node) ||\n ((t.isFunctionExpression(node) || t.isClassExpression(node)) && !node.id)\n );\n}\n\nfunction emitSetFunctionNameCall(\n state: PluginPass,\n expression: t.Expression,\n name: string,\n) {\n return t.callExpression(state.addHelper(\"setFunctionName\"), [\n expression,\n t.stringLiteral(name),\n ]);\n}\n\nexport default declare(api => {\n // The first Babel 7 version with usingCtx helper support.\n api.assertVersion(REQUIRED_VERSION(\"^7.23.9 || ^8.0.0-0\"));\n\n const TOP_LEVEL_USING = new Map<t.Node, USING_KIND>();\n\n function isUsingDeclaration(node: t.Node): node is t.VariableDeclaration {\n if (!t.isVariableDeclaration(node)) return false;\n return (\n node.kind === \"using\" ||\n node.kind === \"await using\" ||\n TOP_LEVEL_USING.has(node)\n );\n }\n\n const transformUsingDeclarationsVisitor: Visitor<PluginPass> = {\n ForOfStatement(path: NodePath<t.ForOfStatement>) {\n const { left } = path.node;\n if (!isUsingDeclaration(left)) return;\n\n const { id } = left.declarations[0];\n const tmpId = path.scope.generateUidIdentifierBasedOnNode(id);\n left.declarations[0].id = tmpId;\n left.kind = \"const\";\n\n path.ensureBlock();\n unshiftForXStatementBody(path, [\n t.variableDeclaration(\"using\", [\n t.variableDeclarator(id, t.cloneNode(tmpId)),\n ]),\n ]);\n },\n \"BlockStatement|StaticBlock\"(\n path: NodePath<t.BlockStatement | t.StaticBlock>,\n state,\n ) {\n let ctx: t.Identifier | null = null;\n let needsAwait = false;\n const scope = path.scope;\n\n for (const node of path.node.body) {\n if (!isUsingDeclaration(node)) continue;\n ctx ??= scope.generateUidIdentifier(\"usingCtx\");\n const isAwaitUsing =\n node.kind === \"await using\" ||\n TOP_LEVEL_USING.get(node) === USING_KIND.AWAIT;\n needsAwait ||= isAwaitUsing;\n\n if (!TOP_LEVEL_USING.delete(node)) {\n node.kind = \"const\";\n }\n for (const decl of node.declarations) {\n const currentInit = decl.init;\n decl.init = t.callExpression(\n t.memberExpression(\n t.cloneNode(ctx),\n isAwaitUsing ? t.identifier(\"a\") : t.identifier(\"u\"),\n ),\n [\n isAnonymousFunctionDefinition(currentInit) &&\n t.isIdentifier(decl.id)\n ? emitSetFunctionNameCall(state, currentInit, decl.id.name)\n : currentInit,\n ],\n );\n }\n }\n if (!ctx) return;\n\n const disposeCall = t.callExpression(\n t.memberExpression(t.cloneNode(ctx), t.identifLine truncated
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Generated
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+42
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{
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"name": "@babel/plugin-transform-explicit-resource-management",
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"version": "7.29.7",
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"description": "Compile `using` and `await using` declarations to ES2015",
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"repository": {
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"type": "git",
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"url": "https://github.com/babel/babel.git",
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"directory": "packages/babel-plugin-transform-explicit-resource-management"
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},
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"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-explicit-resource-management",
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"license": "MIT",
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"publishConfig": {
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"access": "public"
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},
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"main": "./lib/index.js",
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"keywords": [
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"babel-plugin"
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],
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"dependencies": {
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"@babel/helper-plugin-utils": "^7.29.7",
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"@babel/plugin-transform-destructuring": "^7.29.7"
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},
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"peerDependencies": {
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"@babel/core": "^7.0.0-0"
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},
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"devDependencies": {
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"@babel/core": "^7.29.7",
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"@babel/helper-plugin-test-runner": "^7.29.7"
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},
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"engines": {
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"node": ">=6.9.0"
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},
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"author": "The Babel Team (https://babel.dev/team)",
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"exports": {
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".": {
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"types": "./lib/index.d.ts",
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"default": "./lib/index.js"
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},
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"./package.json": "./package.json"
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},
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"type": "commonjs"
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}
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