{"version":3,"names":["_core","require","_globalTypes","transpileNamespace","path","allowNamespaces","node","declare","id","type","remove","get","buildCodeFrameError","name","value","handleNested","t","cloneNode","program","findParent","p","isProgram","registerGlobalType","scope","hasOwnBinding","replaceWith","registerDeclaration","replaceWithMultiple","getDeclaration","variableDeclaration","variableDeclarator","identifier","getMemberExpression","itemName","memberExpression","handleVariableDeclaration","hub","kind","file","declarations","every","declarator","isIdentifier","init","assignmentExpression","bindingIdentifiers","getBindingIdentifiers","assignments","idName","push","expressionStatement","sequenceExpression","buildNestedAmbientModuleError","buildError","Error","parentExport","names","Set","realName","assertIdentifier","generateUid","namespaceTopLevel","isTSModuleBlock","body","exportNamedDeclaration","isEmpty","i","length","subNode","transformed","moduleName","has","add","splice","isTypeScript","declaration","nodes","fallthroughValue","objectExpression","memberExpr","template","expression","ast","statement"],"sources":["../src/namespace.ts"],"sourcesContent":["import { template, types as t, type NodePath } from \"@babel/core\";\n\nimport { registerGlobalType } from \"./global-types.ts\";\n\nexport default function transpileNamespace(\n  path: NodePath<t.TSModuleDeclaration>,\n  allowNamespaces: boolean,\n) {\n  if (path.node.declare || path.node.id.type === \"StringLiteral\") {\n    path.remove();\n    return;\n  }\n\n  if (!allowNamespaces) {\n    throw path\n      .get(\"id\")\n      .buildCodeFrameError(\n        \"Namespace not marked type-only declare.\" +\n          \" Non-declarative namespaces are only supported experimentally in Babel.\" +\n          \" To enable and review caveats see:\" +\n          \" https://babeljs.io/docs/en/babel-plugin-transform-typescript\",\n      );\n  }\n\n  const name = path.node.id.name;\n  const value = handleNested(path, t.cloneNode(path.node, true));\n  if (value === null) {\n    // This means that `path` is a type-only namespace.\n    // We call `registerGlobalType` here to allow it to be stripped.\n    const program = path.findParent(p => p.isProgram());\n    registerGlobalType(program.scope, name);\n\n    path.remove();\n  } else if (path.scope.hasOwnBinding(name)) {\n    path.replaceWith(value);\n  } else {\n    path.scope.registerDeclaration(\n      path.replaceWithMultiple([getDeclaration(name), value])[0],\n    );\n  }\n}\n\nfunction getDeclaration(name: string) {\n  return t.variableDeclaration(\"let\", [\n    t.variableDeclarator(t.identifier(name)),\n  ]);\n}\n\nfunction getMemberExpression(name: string, itemName: string) {\n  return t.memberExpression(t.identifier(name), t.identifier(itemName));\n}\n\n/**\n * Convert export const foo = 1 to Namespace.foo = 1;\n *\n * @param {t.VariableDeclaration} node given variable declaration, e.g. `const foo = 1`\n * @param {string} name the generated unique namespace member name\n * @param {*} hub An instance implements HubInterface defined in `@babel/traverse` that can throw a code frame error\n */\nfunction handleVariableDeclaration(\n  node: t.VariableDeclaration,\n  name: string,\n  hub: any,\n): t.Statement[] {\n  if (node.kind !== \"const\") {\n    throw hub.file.buildCodeFrameError(\n      node,\n      \"Namespaces exporting non-const are not supported by Babel.\" +\n        \" Change to const or see:\" +\n        \" https://babeljs.io/docs/en/babel-plugin-transform-typescript\",\n    );\n  }\n  const { declarations } = node;\n  if (\n    declarations.every(\n      (declarator): declarator is t.VariableDeclarator & { id: t.Identifier } =>\n        t.isIdentifier(declarator.id),\n    )\n  ) {\n    // `export const a = 1` transforms to `const a = N.a = 1`, the output\n    // is smaller than `const a = 1; N.a = a`;\n    for (const declarator of declarations) {\n      declarator.init = t.assignmentExpression(\n        \"=\",\n        getMemberExpression(name, declarator.id.name),\n        declarator.init,\n      );\n    }\n    return [node];\n  }\n  // Now we have pattern in declarators\n  // `export const [a] = 1` transforms to `const [a] = 1; N.a = a`\n  const bindingIdentifiers = t.getBindingIdentifiers(node);\n  const assignments = [];\n  // getBindingIdentifiers returns an object without prototype.\n  // eslint-disable-next-line guard-for-in\n  for (const idName in bindingIdentifiers) {\n    assignments.push(\n      t.assignmentExpression(\n        \"=\",\n        getMemberExpression(name, idName),\n        t.cloneNode(bindingIdentifiers[idName]),\n      ),\n    );\n  }\n  return [node, t.expressionStatement(t.sequenceExpression(assignments))];\n}\n\nfunction buildNestedAmbientModuleError(path: NodePath, node: t.Node) {\n  return path.hub.buildError(\n    node,\n    \"Ambient modules cannot be nested in other modules or namespaces.\",\n    Error,\n  );\n}\n\nfunction handleNested(\n  path: NodePath,\n  node: t.TSModuleDeclaration,\n  parentExport?: t.Expression,\n): t.Statement | null {\n  const names = new Set();\n  const realName = node.id;\n  t.assertIdentifier(realName);\n\n  const name = path.scope.generateUid(realName.name);\n\n  const namespaceTopLevel: t.Statement[] = t.isTSModuleBlock(node.body)\n    ? node.body.body\n    : // We handle `namespace X.Y {}` as if it was\n      //   namespace X {\n      //     export namespace Y {}\n      //   }\n      [t.exportNamedDeclaration(node.body)];\n\n  let isEmpty = true;\n\n  for (let i = 0; i < namespaceTopLevel.length; i++) {\n    const subNode = namespaceTopLevel[i];\n\n    // The first switch is mainly to detect name usage. Only export\n    // declarations require further transformation.\n    switch (subNode.type) {\n      case \"TSModuleDeclaration\": {\n        if (!t.isIdentifier(subNode.id)) {\n          throw buildNestedAmbientModuleError(path, subNode);\n        }\n\n        const transformed = handleNested(path, subNode);\n        if (transformed !== null) {\n          isEmpty = false;\n          const moduleName = subNode.id.name;\n          if (names.has(moduleName)) {\n            namespaceTopLevel[i] = transformed;\n          } else {\n            names.add(moduleName);\n            namespaceTopLevel.splice(\n              i++,\n              1,\n              getDeclaration(moduleName),\n              transformed,\n            );\n          }\n        }\n        continue;\n      }\n      case \"TSEnumDeclaration\":\n      case \"FunctionDeclaration\":\n      case \"ClassDeclaration\":\n        isEmpty = false;\n        names.add(subNode.id.name);\n        continue;\n      case \"VariableDeclaration\": {\n        isEmpty = false;\n        // getBindingIdentifiers returns an object without prototype.\n        // eslint-disable-next-line guard-for-in\n        for (const name in t.getBindingIdentifiers(subNode)) {\n          names.add(name);\n        }\n        continue;\n      }\n      default:\n        isEmpty &&= t.isTypeScript(subNode);\n        // Neither named declaration nor export, continue to next item.\n        continue;\n      case \"ExportNamedDeclaration\":\n      // Export declarations get parsed using the next switch.\n    }\n\n    if (\"declare\" in subNode.declaration && subNode.declaration.declare) {\n      continue;\n    }\n\n    // Transform the export declarations that occur inside of a namespace.\n    switch (subNode.declaration.type) {\n      case \"TSEnumDeclaration\":\n      case \"FunctionDeclaration\":\n      case \"ClassDeclaration\": {\n        isEmpty = false;\n        const itemName = subNode.declaration.id.name;\n        names.add(itemName);\n        namespaceTopLevel.splice(\n          i++,\n          1,\n          subNode.declaration,\n          t.expressionStatement(\n            t.assignmentExpression(\n              \"=\",\n              getMemberExpression(name, itemName),\n              t.identifier(itemName),\n            ),\n          ),\n        );\n        break;\n      }\n      case \"VariableDeclaration\": {\n        isEmpty = false;\n        const nodes = handleVariableDeclaration(\n          subNode.declaration,\n          name,\n          path.hub,\n        );\n        namespaceTopLevel.splice(i, nodes.length, ...nodes);\n        i += nodes.length - 1;\n        break;\n      }\n      case \"TSModuleDeclaration\": {\n        if (!t.isIdentifier(subNode.declaration.id)) {\n          throw buildNestedAmbientModuleError(path, subNode.declaration);\n        }\n\n        const transformed = handleNested(\n          path,\n          subNode.declaration,\n          t.identifier(name),\n        );\n        if (transformed !== null) {\n          isEmpty = false;\n          const moduleName = subNode.declaration.id.name;\n          if (names.has(moduleName)) {\n            namespaceTopLevel[i] = transformed;\n          } else {\n            names.add(moduleName);\n            namespaceTopLevel.splice(\n              i++,\n              1,\n              getDeclaration(moduleName),\n              transformed,\n            );\n          }\n        } else {\n          namespaceTopLevel.splice(i, 1);\n          i--;\n        }\n      }\n    }\n  }\n\n  if (isEmpty) return null;\n\n  // {}\n  let fallthroughValue: t.Expression = t.objectExpression([]);\n\n  if (parentExport) {\n    const memberExpr = t.memberExpression(parentExport, realName);\n    fallthroughValue = template.expression.ast`\n      ${t.cloneNode(memberExpr)} ||\n        (${t.cloneNode(memberExpr)} = ${fallthroughValue})\n    `;\n  }\n\n  return template.statement.ast`\n    (function (${t.identifier(name)}) {\n      ${namespaceTopLevel}\n    })(${realName} || (${t.cloneNode(realName)} = ${fallthroughValue}));\n  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