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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-modules-commonjs
> This plugin transforms ES2015 modules to CommonJS
See our website [@babel/plugin-transform-modules-commonjs](https://babeljs.io/docs/en/babel-plugin-transform-modules-commonjs) for more information.
## Install
Using npm:
```sh
npm install --save-dev @babel/plugin-transform-modules-commonjs
```
or using yarn:
```sh
yarn add @babel/plugin-transform-modules-commonjs --dev
```

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _helperModuleTransforms = require("@babel/helper-module-transforms");
var _helperSimpleAccess = _interopRequireDefault(require("@babel/helper-simple-access"));
var _core = require("@babel/core");
var _utils = require("babel-plugin-dynamic-import-node/utils");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var _default = (0, _helperPluginUtils.declare)((api, options) => {
var _api$assumption, _api$assumption2;
api.assertVersion(7);
const transformImportCall = (0, _utils.createDynamicImportTransform)(api);
const {
strictNamespace = false,
mjsStrictNamespace = true,
allowTopLevelThis,
strict,
strictMode,
noInterop,
lazy = false,
allowCommonJSExports = true
} = options;
const constantReexports = (_api$assumption = api.assumption("constantReexports")) != null ? _api$assumption : options.loose;
const enumerableModuleMeta = (_api$assumption2 = api.assumption("enumerableModuleMeta")) != null ? _api$assumption2 : options.loose;
if (typeof lazy !== "boolean" && typeof lazy !== "function" && (!Array.isArray(lazy) || !lazy.every(item => typeof item === "string"))) {
throw new Error(`.lazy must be a boolean, array of strings, or a function`);
}
if (typeof strictNamespace !== "boolean") {
throw new Error(`.strictNamespace must be a boolean, or undefined`);
}
if (typeof mjsStrictNamespace !== "boolean") {
throw new Error(`.mjsStrictNamespace must be a boolean, or undefined`);
}
const getAssertion = localName => _core.template.expression.ast`
(function(){
throw new Error(
"The CommonJS '" + "${localName}" + "' variable is not available in ES6 modules." +
"Consider setting setting sourceType:script or sourceType:unambiguous in your " +
"Babel config for this file.");
})()
`;
const moduleExportsVisitor = {
ReferencedIdentifier(path) {
const localName = path.node.name;
if (localName !== "module" && localName !== "exports") return;
const localBinding = path.scope.getBinding(localName);
const rootBinding = this.scope.getBinding(localName);
if (rootBinding !== localBinding || path.parentPath.isObjectProperty({
value: path.node
}) && path.parentPath.parentPath.isObjectPattern() || path.parentPath.isAssignmentExpression({
left: path.node
}) || path.isAssignmentExpression({
left: path.node
})) {
return;
}
path.replaceWith(getAssertion(localName));
},
AssignmentExpression(path) {
const left = path.get("left");
if (left.isIdentifier()) {
const localName = path.node.name;
if (localName !== "module" && localName !== "exports") return;
const localBinding = path.scope.getBinding(localName);
const rootBinding = this.scope.getBinding(localName);
if (rootBinding !== localBinding) return;
const right = path.get("right");
right.replaceWith(_core.types.sequenceExpression([right.node, getAssertion(localName)]));
} else if (left.isPattern()) {
const ids = left.getOuterBindingIdentifiers();
const localName = Object.keys(ids).filter(localName => {
if (localName !== "module" && localName !== "exports") return false;
return this.scope.getBinding(localName) === path.scope.getBinding(localName);
})[0];
if (localName) {
const right = path.get("right");
right.replaceWith(_core.types.sequenceExpression([right.node, getAssertion(localName)]));
}
}
}
};
return {
name: "transform-modules-commonjs",
pre() {
this.file.set("@babel/plugin-transform-modules-*", "commonjs");
},
visitor: {
CallExpression(path) {
if (!this.file.has("@babel/plugin-proposal-dynamic-import")) return;
if (!path.get("callee").isImport()) return;
let {
scope
} = path;
do {
scope.rename("require");
} while (scope = scope.parent);
transformImportCall(this, path.get("callee"));
},
Program: {
exit(path, state) {
if (!(0, _helperModuleTransforms.isModule)(path)) return;
path.scope.rename("exports");
path.scope.rename("module");
path.scope.rename("require");
path.scope.rename("__filename");
path.scope.rename("__dirname");
if (!allowCommonJSExports) {
(0, _helperSimpleAccess.default)(path, new Set(["module", "exports"]));
path.traverse(moduleExportsVisitor, {
scope: path.scope
});
}
let moduleName = (0, _helperModuleTransforms.getModuleName)(this.file.opts, options);
if (moduleName) moduleName = _core.types.stringLiteral(moduleName);
const {
meta,
headers
} = (0, _helperModuleTransforms.rewriteModuleStatementsAndPrepareHeader)(path, {
exportName: "exports",
constantReexports,
enumerableModuleMeta,
strict,
strictMode,
allowTopLevelThis,
noInterop,
lazy,
esNamespaceOnly: typeof state.filename === "string" && /\.mjs$/.test(state.filename) ? mjsStrictNamespace : strictNamespace
});
for (const [source, metadata] of meta.source) {
const loadExpr = _core.types.callExpression(_core.types.identifier("require"), [_core.types.stringLiteral(source)]);
let header;
if ((0, _helperModuleTransforms.isSideEffectImport)(metadata)) {
if (metadata.lazy) throw new Error("Assertion failure");
header = _core.types.expressionStatement(loadExpr);
} else {
const init = (0, _helperModuleTransforms.wrapInterop)(path, loadExpr, metadata.interop) || loadExpr;
if (metadata.lazy) {
header = _core.template.ast`
function ${metadata.name}() {
const data = ${init};
${metadata.name} = function(){ return data; };
return data;
}
`;
} else {
header = _core.template.ast`
var ${metadata.name} = ${init};
`;
}
}
header.loc = metadata.loc;
headers.push(header);
headers.push(...(0, _helperModuleTransforms.buildNamespaceInitStatements)(meta, metadata, constantReexports));
}
(0, _helperModuleTransforms.ensureStatementsHoisted)(headers);
path.unshiftContainer("body", headers);
}
}
}
};
});
exports.default = _default;

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{
"name": "@babel/plugin-transform-modules-commonjs",
"version": "7.13.8",
"description": "This plugin transforms ES2015 modules to CommonJS",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-transform-modules-commonjs"
},
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "lib/index.js",
"dependencies": {
"@babel/helper-module-transforms": "^7.13.0",
"@babel/helper-plugin-utils": "^7.13.0",
"@babel/helper-simple-access": "^7.12.13",
"babel-plugin-dynamic-import-node": "^2.3.3"
},
"keywords": [
"babel-plugin"
],
"peerDependencies": {
"@babel/core": "^7.0.0-0"
},
"devDependencies": {
"@babel/core": "7.13.8",
"@babel/helper-plugin-test-runner": "7.12.13",
"@babel/plugin-syntax-object-rest-spread": "^7.8.3"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-modules-commonjs"
}