@babel/helper-create-class-features-plugin/lib/decorators.js.map

Compile class public and private fields, private methods and decorators to ES6

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type { NodePath, Scope, Visitor } from \"@babel/core\";\nimport { types as t, template } from \"@babel/core\";\nimport ReplaceSupers from \"@babel/helper-replace-supers\";\nimport type { PluginAPI, PluginObject, PluginPass } from \"@babel/core\";\nimport { skipTransparentExprWrappers } from \"@babel/helper-skip-transparent-expression-wrappers\";\nimport {\n  privateNameVisitorFactory,\n  type PrivateNameVisitorState,\n} from \"./fields.ts\";\nimport { memoiseComputedKey } from \"./misc.ts\";\n\n// We inline this package\n// eslint-disable-next-line import/no-extraneous-dependencies\nimport * as charCodes from \"charcodes\";\ninterface Options {\n  /** @deprecated use `constantSuper` assumption instead. Only supported in 2021-12 version. */\n  loose?: boolean;\n}\n\ntype ClassDecoratableElement =\n  | t.ClassMethod\n  | t.ClassPrivateMethod\n  | t.ClassProperty\n  | t.ClassPrivateProperty\n  | t.ClassAccessorProperty;\n\ntype ClassElement =\n  | ClassDecoratableElement\n  | t.TSDeclareMethod\n  | t.TSIndexSignature\n  | t.StaticBlock;\n\ntype ClassElementCanHaveComputedKeys =\n  | t.ClassMethod\n  | t.ClassProperty\n  | t.ClassAccessorProperty;\n\n// TODO(Babel 8): Only keep 2023-11\nexport type DecoratorVersionKind =\n  | \"2023-11\"\n  | \"2023-05\"\n  | \"2023-01\"\n  | \"2022-03\"\n  | \"2021-12\";\n\nfunction incrementId(id: number[], idx = id.length - 1): void {\n  // If index is -1, id needs an additional character, unshift A\n  if (idx === -1) {\n    id.unshift(charCodes.uppercaseA);\n    return;\n  }\n\n  const current = id[idx];\n\n  if (current === charCodes.uppercaseZ) {\n    // if current is Z, skip to a\n    id[idx] = charCodes.lowercaseA;\n  } else if (current === charCodes.lowercaseZ) {\n    // if current is z, reset to A and carry the 1\n    id[idx] = charCodes.uppercaseA;\n    incrementId(id, idx - 1);\n  } else {\n    // else, increment by one\n    id[idx] = current + 1;\n  }\n}\n\n/**\n * Generates a new private name that is unique to the given class. This can be\n * used to create extra class fields and methods for the implementation, while\n * keeping the length of those names as small as possible. This is important for\n * minification purposes (though private names can generally be minified,\n * transpilations and polyfills cannot yet).\n */\nfunction createPrivateUidGeneratorForClass(\n  classPath: NodePath<t.ClassDeclaration | t.ClassExpression>,\n): () => t.PrivateName {\n  const currentPrivateId: number[] = [];\n  const privateNames = new Set<string>();\n\n  classPath.traverse({\n    PrivateName(path) {\n      privateNames.add(path.node.id.name);\n    },\n  });\n\n  return (): t.PrivateName => {\n    let reifiedId;\n    do {\n      incrementId(currentPrivateId);\n      reifiedId = String.fromCharCode(...currentPrivateId);\n    } while (privateNames.has(reifiedId));\n\n    return t.privateName(t.identifier(reifiedId));\n  };\n}\n\n/**\n * Wraps the above generator function so that it's run lazily the first time\n * it's actually required. Several types of decoration do not require this, so it\n * saves iterating the class elements an additional time and allocating the space\n * for the Sets of element names.\n */\nfunction createLazyPrivateUidGeneratorForClass(\n  classPath: NodePath<t.ClassDeclaration | t.ClassExpression>,\n): () => t.PrivateName {\n  let generator: () => t.PrivateName;\n\n  return (): t.PrivateName => {\n    if (!generator) {\n      generator = createPrivateUidGeneratorForClass(classPath);\n    }\n\n    return generator();\n  };\n}\n\n/**\n * Takes a class definition and the desired class name if anonymous and\n * replaces it with an equivalent class declaration (path) which is then\n * assigned to a local variable (id). This allows us to reassign the local variable with the\n * decorated version of the class. The class definition retains its original\n * name so that `toString` is not affected, other references to the class\n * are renamed instead.\n */\nfunction replaceClassWithVar(\n  path: NodePath<t.ClassDeclaration | t.ClassExpression>,\n  className: string | t.Identifier | t.StringLiteral | undefined,\n): {\n  id: t.Identifier;\n  path: NodePath<t.ClassDeclaration | t.ClassExpression>;\n} {\n  const id = path.node.id;\n  const scope = path.scope;\n  if (path.type === \"ClassDeclaration\") {\n    const className = id.name;\n    const varId = scope.generateUidIdentifierBasedOnNode(id);\n    const classId = t.identifier(className);\n\n    scope.rename(className, varId.name);\n\n    path.get(\"id\").replaceWith(classId);\n\n    return { id: t.cloneNode(varId), path };\n  } else {\n    let varId: t.Identifier;\n\n    if (id) {\n      className = id.name;\n      varId = generateLetUidIdentifier(scope.parent, className);\n      scope.rename(className, varId.name);\n    } else {\n      varId = generateLetUidIdentifier(\n        scope.parent,\n        typeof className === \"string\" ? className : \"decorated_class\",\n      );\n    }\n\n    const newClassExpr = t.classExpression(\n      typeof className === \"string\" ? t.identifier(className) : null,\n      path.node.superClass,\n      path.node.body,\n    );\n\n    const [newPath] = path.replaceWith(\n      t.sequenceExpression([newClassExpr, varId]),\n    );\n\n    return {\n      id: t.cloneNode(varId),\n      path: newPath.get(\"expressions.0\") as NodePath<t.ClassExpression>,\n    };\n  }\n}\n\nfunction generateClassProperty(\n  key: t.PrivateName | t.Identifier,\n  value: t.Expression | undefined,\n  isStatic: boolean,\n): t.ClassPrivateProperty | t.ClassProperty {\n  if (key.type === \"PrivateName\") {\n    return t.classPrivateProperty(key, value, undefined, isStatic);\n  } else {\n    return t.classProperty(key, value, undefined, undefined, isStatic);\n  }\n}\n\nfunction assignIdForAnonymousClass(\n  path: NodePath<t.Class>,\n  className: string | t.Identifier | t.StringLiteral | undefined,\n) {\n  if (!path.node.id) {\n    path.node.id =\n      typeof className === \"string\"\n        ? t.identifier(className)\n        : path.scope.generateUidIdentifier(\"Class\");\n  }\n}\n\nfunction addProxyAccessorsFor(\n  className: t.Identifier,\n  element: NodePath<ClassDecoratableElement>,\n  getterKey: t.PrivateName | t.Expression,\n  setterKey: t.PrivateName | t.Expression,\n  targetKey: t.PrivateName,\n  isComputed: boolean,\n  isStatic: boolean,\n  version: DecoratorVersionKind,\n): void {\n  const thisArg =\n    (version === \"2023-11\" ||\n      (!process.env.BABEL_8_BREAKING && version === \"2023-05\")) &&\n    isStatic\n      ? className\n      : t.thisExpression();\n\n  const getterBody = t.blockStatement([\n    t.returnStatement(\n      t.memberExpression(t.cloneNode(thisArg), t.cloneNode(targetKey)),\n    ),\n  ]);\n\n  const setterBody = t.blockStatement([\n    t.expressionStatement(\n      t.assignmentExpression(\n        \"=\",\n        t.memberExpression(t.cloneNode(thisArg), t.cloneNode(targetKey)),\n        t.identifier(\"v\"),\n      ),\n    ),\n  ]);\n\n  let getter: t.ClassMethod | t.ClassPrivateMethod,\n    setter: t.ClassMethod | t.ClassPrivateMethod;\n\n  if (getterKey.type === \"PrivateName\") {\n    getter = t.classPrivateMethod(\"get\", getterKey, [], getterBody, isStatic);\n    setter = t.classPrivateMethod(\n      \"set\",\n      setterKey as t.PrivateName,\n      [t.identifier(\"v\")],\n      setterBody,\n      isStatic,\n    );\n  } else {\n    getter = t.classMethod(\n      \"get\",\n      getterKey,\n      [],\n      getterBody,\n      isComputed,\n      isStatic,\n    );\n    setter = t.classMethod(\n      \"set\",\n      setterKey as t.Expression,\n      [t.identifier(\"v\")],\n      setterBody,\n      isComputed,\n      isStatic,\n    );\n  }\n\n  element.insertAfter(setter);\n  element.insertAfter(getter);\n}\n\nfunction extractProxyAccessorsFor(\n  targetKey: t.PrivateName,\n  version: DecoratorVersionKind,\n): (t.FunctionExpression | t.ArrowFunctionExpression)[] {\n  if (version !== \"2023-11\" && version !== \"2023-05\" && version !== \"2023-01\") {\n    return [\n      template.expression.ast`\n        function () {\n          return this.${t.cloneNode(targetKey)};\n        }\n      ` as t.FunctionExpression,\n      template.expression.ast`\n        function (value) {\n          this.${t.cloneNode(targetKey)} = value;\n        }\n      ` as t.FunctionExpression,\n    ];\n  }\n  return [\n    template.expression.ast`\n      o => o.${t.cloneNode(targetKey)}\n    ` as t.ArrowFunctionExpression,\n    template.expression.ast`\n      (o, v) => o.${t.cloneNode(targetKey)} = v\n    ` as t.ArrowFunctionExpression,\n  ];\n}\n\n/**\n * Get the last element for the given computed key path.\n *\n * This function unwraps transparent wrappers and gets the last item when\n * the key is a SequenceExpression.\n *\n * @param {NodePath<t.Expression>} path The key of a computed class element\n * @returns {NodePath<t.Expression>} The simple completion result\n */\nfunction getComputedKeyLastElement(\n  path: NodePath<t.Expression>,\n): NodePath<t.Expression> {\n  path = skipTransparentExprWrappers(path);\n  if (path.isSequenceExpression()) {\n    const expressions = path.get(\"expressions\");\n    return getComputedKeyLastElement(expressions[expressions.length - 1]);\n  }\n  return path;\n}\n\n/**\n * Get a memoiser of the computed key path.\n *\n * This function does not mutate AST. If the computed key is not a constant\n * expression, this function must be called after the key has been memoised.\n *\n * @param {NodePath<t.Expression>} path The key of a computed class element.\n * @returns {t.Expression} A clone of key if key is a constant expression,\n * otherwise a memoiser identifier.\n */\nfunction getComputedKeyMemoiser(path: NodePath<t.Expression>): t.Expression {\n  const element = getComputedKeyLastElement(path);\n  if (element.isConstantExpression()) {\n    return t.cloneNode(path.node);\n  } else if (element.isIdentifier() && path.scope.hasUid(element.node.name)) {\n    return t.cloneNode(path.node);\n  } else if (\n    element.isAssignmentExpression() &&\n    element.get(\"left\").isIdentifier()\n  ) {\n    return t.cloneNode(element.node.left as t.Identifier);\n  } else {\n    throw new Error(\n      `Internal Error: the computed key ${path.toString()} has not yet been memoised.`,\n    );\n  }\n}\n\n/**\n * Prepend expressions to the computed key of the given field path.\n *\n * If the computed key is a sequence expression, this function will unwrap\n * the sequence expression for optimal output size.\n *\n * @param {t.Expression[]} expressions\n * @param {(NodePath<\n *     t.ClassMethod | t.ClassProperty | t.ClassAccessorProperty\n *   >)} fieldPath\n */\nfunction prependExpressionsToComputedKey(\n  expressions: t.Expression[],\n  fieldPath: NodePath<\n    t.ClassMethod | t.ClassProperty | t.ClassAccessorProperty\n  >,\n) {\n  const key = fieldPath.get(\"key\") as NodePath<t.Expression>;\n  if (key.isSequenceExpression()) {\n    expressions.push(...key.node.expressions);\n  } else {\n    expressions.push(key.node);\n  }\n  key.replaceWith(maybeSequenceExpression(expressions));\n}\n\n/**\n * Append expressions to the computed key of the given field path.\n *\n * If the computed key is a constant expression or uid reference, it\n * will prepend expressions before the comptued key. Otherwise it will\n * memoise the computed key to preserve its completion result.\n *\n * @param {t.Expression[]} expressions\n * @param {(NodePath<\n *     t.ClassMethod | t.ClassProperty | t.ClassAccessorProperty\n *   >)} fieldPath\n */\nfunction appendExpressionsToComputedKey(\n  expressions: t.Expression[],\n  fieldPath: NodePath<\n    t.ClassMethod | t.ClassProperty | t.ClassAccessorProperty\n  >,\n) {\n  const key = fieldPath.get(\"key\") as NodePath<t.Expression>;\n  const completion = getComputedKeyLastElement(key);\n  if (completion.isConstantExpression()) {\n    prependExpressionsToComputedKey(expressions, fieldPath);\n  } else {\n    const scopeParent = key.scope.parent;\n    const maybeAssignment = memoiseComputedKey(\n      completion.node,\n      scopeParent,\n      scopeParent.generateUid(\"computedKey\"),\n    );\n    if (!maybeAssignment) {\n      // If the memoiseComputedKey returns undefined, the key is already a uid reference,\n      // treat it as a constant expression and prepend expressions before it\n      prependExpressionsToComputedKey(expressions, fieldPath);\n    } else {\n      const expressionSequence = [\n        ...expressions,\n        // preserve the completion result\n        t.cloneNode(maybeAssignment.left),\n      ];\n      const completionParent = completion.parentPath;\n      if (completionParent.isSequenceExpression()) {\n        completionParent.pushContainer(\"expressions\", expressionSequence);\n      } else {\n        completion.replaceWith(\n          maybeSequenceExpression([\n            t.cloneNode(maybeAssignment),\n            ...expressionSequence,\n          ]),\n        );\n      }\n    }\n  }\n}\n\n/**\n * Prepend expressions to the field initializer. If the initializer is not defined,\n * this function will wrap the last expression within a `void` unary expression.\n *\n * @param {t.Expression[]} expressions\n * @param {(NodePath<\n *     t.ClassProperty | t.ClassPrivateProperty | t.ClassAccessorProperty\n *   >)} fieldPath\n */\nfunction prependExpressionsToFieldInitializer(\n  expressions: t.Expression[],\n  fieldPath: NodePath<\n    t.ClassProperty | t.ClassPrivateProperty | t.ClassAccessorProperty\n  >,\n) {\n  const initializer = fieldPath.get(\"value\");\n  if (initializer.node) {\n    expressions.push(initializer.node);\n  } else if (expressions.length > 0) {\n    expressions[expressions.length - 1] = t.unaryExpression(\n      \"void\",\n      expressions[expressions.length - 1],\n    );\n  }\n  initializer.replaceWith(maybeSequenceExpression(expressions));\n}\n\nfunction prependExpressionsToStaticBlock(\n  expressions: t.Expression[],\n  blockPath: NodePath<t.StaticBlock>,\n) {\n  blockPath.unshiftContainer(\n    \"body\",\n    t.expressionStatement(maybeSequenceExpression(expressions)),\n  );\n}\n\nfunction prependExpressionsToConstructor(\n  expressions: t.Expression[],\n  constructorPath: NodePath<t.ClassMethod>,\n) {\n  constructorPath.node.body.body.unshift(\n    t.expressionStatement(maybeSequenceExpression(expressions)),\n  );\n}\n\nfunction isProtoInitCallExpression(\n  expression: t.Expression,\n  protoInitCall: t.Identifier,\n) {\n  return (\n    t.isCallExpression(expression) &&\n    t.isIdentifier(expression.callee, { name: protoInitCall.name })\n  );\n}\n\n/**\n * Optimize super call and its following expressions\n *\n * @param {t.Expression[]} expressions Mutated by this function. The first element must by a super call\n * @param {t.Identifier} protoInitLocal The generated protoInit id\n * @returns optimized expression\n */\nfunction optimizeSuperCallAndExpressions(\n  expressions: t.Expression[],\n  protoInitLocal: t.Identifier,\n) {\n  if (protoInitLocal) {\n    if (\n      expressions.length >= 2 &&\n      isProtoInitCallExpression(expressions[1], protoInitLocal)\n    ) {\n      // Merge `super(), protoInit(this)` into `protoInit(super())`\n      const mergedSuperCall = t.callExpression(t.cloneNode(protoInitLocal), [\n        expressions[0],\n      ]);\n      expressions.splice(0, 2, mergedSuperCall);\n    }\n    // Merge `protoInit(super()), this` into `protoInit(super())`\n    if (\n      expressions.length >= 2 &&\n      t.isThisExpression(expressions[expressions.length - 1]) &&\n      isProtoInitCallExpression(\n        expressions[expressions.length - 2],\n        protoInitLocal,\n      )\n    ) {\n      expressions.splice(expressions.length - 1, 1);\n    }\n  }\n  return maybeSequenceExpression(expressions);\n}\n\n/**\n * Insert expressions immediately after super() and optimize the output if possible.\n * This function will preserve the completion result using the trailing this expression.\n *\n * @param {t.Expression[]} expressions\n * @param {NodePath<t.ClassMethod>} constructorPath\n * @param {t.Identifier} protoInitLocal The generated protoInit id\n * @returns\n */\nfunction insertExpressionsAfterSuperCallAndOptimize(\n  expressions: t.Expression[],\n  constructorPath: NodePath<t.ClassMethod>,\n  protoInitLocal: t.Identifier,\n) {\n  constructorPath.traverse({\n    CallExpression: {\n      exit(path) {\n        if (!path.get(\"callee\").isSuper()) return;\n        const newNodes = [\n          path.node,\n          ...expressions.map(expr => t.cloneNode(expr)),\n        ];\n        // preserve completion result if super() is in an RHS or a return statement\n        if (path.isCompletionRecord()) {\n          newNodes.push(t.thisExpression());\n        }\n        path.replaceWith(\n          optimizeSuperCallAndExpressions(newNodes, protoInitLocal),\n        );\n\n        path.skip();\n      },\n    },\n    ClassMethod(path) {\n      if (path.node.kind === \"constructor\") {\n        path.skip();\n      }\n    },\n  });\n}\n\n/**\n * Build a class constructor node from the given expressions. If the class is\n * derived, the constructor will call super() first to ensure that `this`\n * in the expressions work as expected.\n *\n * @param {t.Expression[]} expressions\n * @param {boolean} isDerivedClass\n * @returns The class constructor node\n */\nfunction createConstructorFromExpressions(\n  expressions: t.Expression[],\n  isDerivedClass: boolean,\n) {\n  const body: t.Statement[] = [\n    t.expressionStatement(maybeSequenceExpression(expressions)),\n  ];\n  if (isDerivedClass) {\n    body.unshift(\n      t.expressionStatement(\n        t.callExpression(t.super(), [t.spreadElement(t.identifier(\"args\"))]),\n      ),\n    );\n  }\n  return t.classMethod(\n    \"constructor\",\n    t.identifier(\"constructor\"),\n    isDerivedClass ? [t.restElement(t.identifier(\"args\"))] : [],\n    t.blockStatement(body),\n  );\n}\n\nfunction createStaticBlockFromExpressions(expressions: t.Expression[]) {\n  return t.staticBlock([\n    t.expressionStatement(maybeSequenceExpression(expressions)),\n  ]);\n}\n\n// 3 bits reserved to this (0-7)\nconst FIELD = 0;\nconst ACCESSOR = 1;\nconst METHOD = 2;\nconst GETTER = 3;\nconst SETTER = 4;\n\nconst STATIC_OLD_VERSION = 5; // Before 2023-05\nconst STATIC = 8; // 1 << 3\nconst DECORATORS_HAVE_THIS = 16; // 1 << 4\n\nfunction getElementKind(element: NodePath<ClassDecoratableElement>): number {\n  switch (element.node.type) {\n    case \"ClassProperty\":\n    case \"ClassPrivateProperty\":\n      return FIELD;\n    case \"ClassAccessorProperty\":\n      return ACCESSOR;\n    case \"ClassMethod\":\n    case \"ClassPrivateMethod\":\n      if (element.node.kind === \"get\") {\n        return GETTER;\n      } else if (element.node.kind === \"set\") {\n        return SETTER;\n      } else {\n        return METHOD;\n      }\n  }\n}\n\n// Information about the decorators applied to an element\ninterface DecoratorInfo {\n  // An array of applied decorators or a memoised identifier\n  decoratorsArray: t.Identifier | t.ArrayExpression | t.Expression;\n  decoratorsHaveThis: boolean;\n\n  // The kind of the decorated value, matches the kind value passed to applyDecs\n  kind: number;\n\n  // whether or not the field is static\n  isStatic: boolean;\n\n  // The name of the decorator\n  name: t.StringLiteral | t.Expression;\n\n  privateMethods:\n    | (t.FunctionExpression | t.ArrowFunctionExpression)[]\n    | undefined;\n\n  // The names of local variables that will be used/returned from the decoration\n  locals: t.Identifier | t.Identifier[] | undefined;\n}\n\n/**\n * Sort decoration info in the application order:\n * - static non-fields\n * - instance non-fields\n * - static fields\n * - instance fields\n *\n * @param {DecoratorInfo[]} info\n * @returns {DecoratorInfo[]} Sorted decoration info\n */\nfunction toSortedDecoratorInfo(info: DecoratorInfo[]): DecoratorInfo[] {\n  return [\n    ...info.filter(\n      el => el.isStatic && el.kind >= ACCESSOR && el.kind <= SETTER,\n    ),\n    ...info.filter(\n      el => !el.isStatic && el.kind >= ACCESSOR && el.kind <= SETTER,\n    ),\n    ...info.filter(el => el.isStatic && el.kind === FIELD),\n    ...info.filter(el => !el.isStatic && el.kind === FIELD),\n  ];\n}\n\ntype GenerateDecorationListResult = {\n  // The zipped decorators array that will be passed to generateDecorationExprs\n  decs: t.Expression[];\n  // Whether there are non-empty decorator this values\n  haveThis: boolean;\n};\n/**\n * Zip decorators and decorator this values into an array\n *\n * @param {t.Decorator[]} decorators\n * @param {((t.Expression | undefined)[])} decoratorsThis decorator this values\n * @param {DecoratorVersionKind} version\n * @returns {GenerateDecorationListResult}\n */\nfunction generateDecorationList(\n  decorators: t.Decorator[],\n  decoratorsThis: (t.Expression | undefined)[],\n  version: DecoratorVersionKind,\n): GenerateDecorationListResult {\n  const decsCount = decorators.length;\n  const haveOneThis = decoratorsThis.some(Boolean);\n  const decs: t.Expression[] = [];\n  for (let i = 0; i < decsCount; i++) {\n    if (\n      (version === \"2023-11\" ||\n        (!process.env.BABEL_8_BREAKING && version === \"2023-05\")) &&\n      haveOneThis\n    ) {\n      decs.push(\n        decoratorsThis[i] || t.unaryExpression(\"void\", t.numericLiteral(0)),\n      );\n    }\n    decs.push(decorators[i].expression);\n  }\n\n  return { haveThis: haveOneThis, decs };\n}\n\nfunction generateDecorationExprs(\n  decorationInfo: DecoratorInfo[],\n  version: DecoratorVersionKind,\n): t.ArrayExpression {\n  return t.arrayExpression(\n    decorationInfo.map(el => {\n      let flag = el.kind;\n      if (el.isStatic) {\n        flag +=\n          version === \"2023-11\" ||\n          (!process.env.BABEL_8_BREAKING && version === \"2023-05\")\n            ? STATIC\n            : STATIC_OLD_VERSION;\n      }\n      if (el.decoratorsHaveThis) flag += DECORATORS_HAVE_THIS;\n\n      return t.arrayExpression([\n        el.decoratorsArray,\n        t.numericLiteral(flag),\n        el.name,\n        ...(el.privateMethods || []),\n      ]);\n    }),\n  );\n}\n\nfunction extractElementLocalAssignments(decorationInfo: DecoratorInfo[]) {\n  const localIds: t.Identifier[] = [];\n\n  for (const el of decorationInfo) {\n    const { locals } = el;\n\n    if (Array.isArray(locals)) {\n      localIds.push(...locals);\n    } else if (locals !== undefined) {\n      localIds.push(locals);\n    }\n  }\n\n  return localIds;\n}\n\nfunction addCallAccessorsFor(\n  version: DecoratorVersionKind,\n  element: NodePath,\n  key: t.PrivateName,\n  getId: t.Identifier,\n  setId: t.Identifier,\n  isStatic: boolean,\n) {\n  element.insertAfter(\n    t.classPrivateMethod(\n      \"get\",\n      t.cloneNode(key),\n      [],\n      t.blockStatement([\n        t.returnStatement(\n          t.callExpression(\n            t.cloneNode(getId),\n            (process.env.BABEL_8_BREAKING || version === \"2023-11\") && isStatic\n              ? []\n              : [t.thisExpression()],\n          ),\n        ),\n      ]),\n      isStatic,\n    ),\n  );\n\n  element.insertAfter(\n    t.classPrivateMethod(\n      \"set\",\n      t.cloneNode(key),\n      [t.identifier(\"v\")],\n      t.blockStatement([\n        t.expressionStatement(\n          t.callExpression(\n            t.cloneNode(setId),\n            (process.env.BABEL_8_BREAKING || version === \"2023-11\") && isStatic\n              ? [t.identifier(\"v\")]\n              : [t.thisExpression(), t.identifier(\"v\")],\n          ),\n        ),\n      ]),\n      isStatic,\n    ),\n  );\n}\n\nfunction movePrivateAccessor(\n  element: NodePath<t.ClassPrivateMethod>,\n  key: t.PrivateName,\n  methodLocalVar: t.Identifier,\n  isStatic: boolean,\n) {\n  let params: (t.Identifier | t.RestElement)[];\n  let block: t.Statement[];\n\n  if (element.node.kind === \"set\") {\n    params = [t.identifier(\"v\")];\n    block = [\n      t.expressionStatement(\n        t.callExpression(methodLocalVar, [\n          t.thisExpression(),\n          t.identifier(\"v\"),\n        ]),\n      ),\n    ];\n  } else {\n    params = [];\n    block = [\n      t.returnStatement(t.callExpression(methodLocalVar, [t.thisExpression()])),\n    ];\n  }\n\n  element.replaceWith(\n    t.classPrivateMethod(\n      element.node.kind,\n      t.cloneNode(key),\n      params,\n      t.blockStatement(block),\n      isStatic,\n    ),\n  );\n}\n\nfunction isClassDecoratableElementPath(\n  path: NodePath<ClassElement>,\n): path is NodePath<ClassDecoratableElement> {\n  const { type } = path;\n\n  return (\n    type !== \"TSDeclareMethod\" &&\n    type !== \"TSIndexSignature\" &&\n    type !== \"StaticBlock\"\n  );\n}\n\nfunction staticBlockToIIFE(block: t.StaticBlock) {\n  return t.callExpression(\n    t.arrowFunctionExpression([], t.blockStatement(block.body)),\n    [],\n  );\n}\n\nfunction staticBlockToFunctionClosure(block: t.StaticBlock) {\n  return t.functionExpression(null, [], t.blockStatement(block.body));\n}\n\nfunction fieldInitializerToClosure(value: t.Expression) {\n  return t.functionExpression(\n    null,\n    [],\n    t.blockStatement([t.returnStatement(value)]),\n  );\n}\n\nfunction maybeSequenceExpression(exprs: t.Expression[]) {\n  if (exprs.length === 0) return t.unaryExpression(\"void\", t.numericLiteral(0));\n  if (exprs.length === 1) return exprs[0];\n  return t.sequenceExpression(exprs);\n}\n\n/**\n * Create FunctionExpression from a ClassPrivateMethod.\n * The returned FunctionExpression node takes ownership of the private method's body and params.\n *\n * @param {t.ClassPrivateMethod} node\n * @returns\n */\nfunction createFunctionExpressionFromPrivateMethod(node: t.ClassPrivateMethod) {\n  const { params, body, generator: isGenerator, async: isAsync } = node;\n  return t.functionExpression(\n    undefined,\n    // @ts-expect-error todo: Improve typings: TSParameterProperty is only allowed in constructor\n    params,\n    body,\n    isGenerator,\n    isAsync,\n  );\n}\n\nfunction createSetFunctionNameCall(\n  state: PluginPass,\n  className: t.Identifier | t.StringLiteral,\n) {\n  return t.callExpression(state.addHelper(\"setFunctionName\"), [\n    t.thisExpression(),\n    className,\n  ]);\n}\n\nfunction createToPropertyKeyCall(state: PluginPass, propertyKey: t.Expression) {\n  return t.callExpression(state.addHelper(\"toPropertyKey\"), [propertyKey]);\n}\n\nfunction createPrivateBrandCheckClosure(brandName: t.PrivateName) {\n  return t.arrowFunctionExpression(\n    [t.identifier(\"_\")],\n    t.binaryExpression(\"in\", t.cloneNode(brandName), t.identifier(\"_\")),\n  );\n}\n\nfunction usesPrivateField(expression: t.Node) {\n  try {\n    t.traverseFast(expression, node => {\n      if (t.isPrivateName(node)) {\n        // TODO: Add early return support to t.traverseFast\n        // eslint-disable-next-line @typescript-eslint/only-throw-error\n        throw null;\n      }\n    });\n    return false;\n  } catch {\n    return true;\n  }\n}\n\n/**\n * Convert a non-computed class element to its equivalent computed form.\n *\n * This function is to provide a decorator evaluation storage from non-computed\n * class elements.\n *\n * @param {(NodePath<t.ClassProperty | t.ClassMethod>)} path A non-computed class property or method\n */\nfunction convertToComputedKey(path: NodePath<t.ClassProperty | t.ClassMethod>) {\n  const { node } = path;\n  node.computed = true;\n  if (t.isIdentifier(node.key)) {\n    node.key = t.stringLiteral(node.key.name);\n  }\n}\n\nfunction hasInstancePrivateAccess(path: NodePath, privateNames: string[]) {\n  let containsInstancePrivateAccess = false;\n  if (privateNames.length > 0) {\n    const privateNameVisitor = privateNameVisitorFactory<\n      PrivateNameVisitorState<null>,\n      null\n    >({\n      PrivateName(path, state) {\n        if (state.privateNamesMap.has(path.node.id.name)) {\n          containsInstancePrivateAccess = true;\n          path.stop();\n        }\n      },\n    });\n    const privateNamesMap = new Map<string, null>();\n    for (const name of privateNames) {\n      privateNamesMap.set(name, null);\n    }\n    path.traverse(privateNameVisitor, {\n      privateNamesMap: privateNamesMap,\n    });\n  }\n  return containsInstancePrivateAccess;\n}\n\nfunction checkPrivateMethodUpdateError(\n  path: NodePath<t.Class>,\n  decoratedPrivateMethods: Set<string>,\n) {\n  const privateNameVisitor = privateNameVisitorFactory<\n    PrivateNameVisitorState<null>,\n    null\n  >({\n    PrivateName(path, state) {\n      if (!state.privateNamesMap.has(path.node.id.name)) return;\n\n      const parentPath = path.parentPath;\n      const parentParentPath = parentPath.parentPath;\n\n      if (\n        // this.bar().#x = 123;\n        (parentParentPath.node.type === \"AssignmentExpression\" &&\n          parentParentPath.node.left === parentPath.node) ||\n        // this.#x++;\n        parentParentPath.node.type === \"UpdateExpression\" ||\n        // ([...this.#x] = foo);\n        parentParentPath.node.type === \"RestElement\" ||\n        // ([this.#x] = foo);\n        parentParentPath.node.type === \"ArrayPattern\" ||\n        // ({ a: this.#x } = bar);\n        (parentParentPath.node.type === \"ObjectProperty\" &&\n          parentParentPath.node.value === parentPath.node &&\n          parentParentPath.parentPath.type === \"ObjectPattern\") ||\n        // for (this.#x of []);\n        (parentParentPath.node.type === \"ForOfStatement\" &&\n          parentParentPath.node.left === parentPath.node)\n      ) {\n        throw path.buildCodeFrameError(\n          `Decorated private methods are read-only, but \"#${path.node.id.name}\" is updated via this expression.`,\n        );\n      }\n    },\n  });\n  const privateNamesMap = new Map<string, null>();\n  for (const name of decoratedPrivateMethods) {\n    privateNamesMap.set(name, null);\n  }\n  path.traverse(privateNameVisitor, {\n    privateNamesMap: privateNamesMap,\n  });\n}\n\n/**\n * Apply decorator and accessor transform\n * @param path The class path.\n * @param state The plugin pass.\n * @param constantSuper The constantSuper compiler assumption.\n * @param ignoreFunctionLength The ignoreFunctionLength compiler assumption.\n * @param className The class name.\n * - If className is a `string`, it will be a valid identifier name that can safely serve as a class id\n * - If className is an Identifier, it is the reference to the name derived from NamedEvaluation\n * - If className is a StringLiteral, it is derived from NamedEvaluation on literal computed keys\n * @param propertyVisitor The visitor that should be applied on property prior to the transform.\n * @param version The decorator version.\n * @returns The transformed class path or undefined if there are no decorators.\n */\nfunction transformClass(\n  path: NodePath<t.Class>,\n  state: PluginPass,\n  constantSuper: boolean,\n  ignoreFunctionLength: boolean,\n  className: string | t.Identifier | t.StringLiteral | undefined,\n  propertyVisitor: Visitor<PluginPass>,\n  version: DecoratorVersionKind,\n): NodePath | undefined {\n  const body = path.get(\"body.body\");\n\n  const classDecorators = path.node.decorators;\n  let hasElementDecorators = false;\n  let hasComputedKeysSideEffects = false;\n  let elemDecsUseFnContext = false;\n\n  const generateClassPrivateUid = createLazyPrivateUidGeneratorForClass(path);\n\n  const classAssignments: t.AssignmentExpression[] = [];\n  const scopeParent: Scope = path.scope.parent;\n  const memoiseExpression = (\n    expression: t.Expression,\n    hint: string,\n    assignments: t.AssignmentExpression[],\n  ) => {\n    const localEvaluatedId = generateLetUidIdentifier(scopeParent, hint);\n    assignments.push(t.assignmentExpression(\"=\", localEvaluatedId, expression));\n    return t.cloneNode(localEvaluatedId);\n  };\n\n  let protoInitLocal: t.Identifier;\n  let staticInitLocal: t.Identifier;\n  const classIdName = path.node.id?.name;\n  // Whether to generate a setFunctionName call to preserve the class name\n  const setClassName = typeof className === \"object\" ? className : undefined;\n  // Check if the decorator does not reference function-specific\n  // context or the given identifier name or contains yield or await expression.\n  // `true` means \"maybe\" and `false` means \"no\".\n  const usesFunctionContextOrYieldAwait = (decorator: t.Decorator) => {\n    try {\n      t.traverseFast(decorator, node => {\n        if (\n          t.isThisExpression(node) ||\n          t.isSuper(node) ||\n          t.isYieldExpression(node) ||\n          t.isAwaitExpression(node) ||\n          t.isIdentifier(node, { name: \"arguments\" }) ||\n          (classIdName && t.isIdentifier(node, { name: classIdName })) ||\n          (t.isMetaProperty(node) && node.meta.name !== \"import\")\n        ) {\n          // TODO: Add early return support to t.traverseFast\n          // eslint-disable-next-line @typescript-eslint/only-throw-error\n          throw null;\n        }\n      });\n      return false;\n    } catch {\n      return true;\n    }\n  };\n\n  const instancePrivateNames: string[] = [];\n  // Iterate over the class to see if we need to decorate it, and also to\n  // transform simple auto accessors which are not decorated, and handle inferred\n  // class name when the initializer of the class field is a class expression\n  for (const element of body) {\n    if (!isClassDecoratableElementPath(element)) {\n      continue;\n    }\n\n    const elementNode = element.node;\n\n    if (!elementNode.static && t.isPrivateName(elementNode.key)) {\n      instancePrivateNames.push(elementNode.key.id.name);\n    }\n\n    if (isDecorated(elementNode)) {\n      switch (elementNode.type) {\n        case \"ClassProperty\":\n          // @ts-expect-error todo: propertyVisitor.ClassProperty should be callable. Improve typings.\n          propertyVisitor.ClassProperty(\n            element as NodePath<t.ClassProperty>,\n            state,\n          );\n          break;\n        case \"ClassPrivateProperty\":\n          // @ts-expect-error todo: propertyVisitor.ClassPrivateProperty should be callable. Improve typings.\n          propertyVisitor.ClassPrivateProperty(\n            element as NodePath<t.ClassPrivateProperty>,\n            state,\n          );\n          break;\n        case \"ClassAccessorProperty\":\n          // @ts-expect-error todo: propertyVisitor.ClassAccessorProperty should be callable. Improve typings.\n          propertyVisitor.ClassAccessorProperty(\n            element as NodePath<t.ClassAccessorProperty>,\n            state,\n          );\n          if (version === \"2023-11\") {\n            break;\n          }\n        /* fallthrough */\n        default:\n          if (elementNode.static) {\n            staticInitLocal ??= generateLetUidIdentifier(\n              scopeParent,\n              \"initStatic\",\n            );\n          } else {\n            protoInitLocal ??= generateLetUidIdentifier(\n              scopeParent,\n              \"initProto\",\n            );\n          }\n          break;\n      }\n      hasElementDecorators = true;\n      elemDecsUseFnContext ||= elementNode.decorators.some(\n        usesFunctionContextOrYieldAwait,\n      );\n    } else if (elementNode.type === \"ClassAccessorProperty\") {\n      // @ts-expect-error todo: propertyVisitor.ClassAccessorProperty should be callable. Improve typings.\n      propertyVisitor.ClassAccessorProperty(\n        element as NodePath<t.ClassAccessorProperty>,\n        state,\n      );\n      const { key, value, static: isStatic, computed } = elementNode;\n\n      const newId = generateClassPrivateUid();\n      const newField = generateClassProperty(newId, value, isStatic);\n      const keyPath = element.get(\"key\");\n      const [newPath] = element.replaceWith(newField);\n\n      let getterKey, setterKey;\n      if (computed && !keyPath.isConstantExpression()) {\n        getterKey = memoiseComputedKey(\n          createToPropertyKeyCall(state, key as t.Expression),\n          scopeParent,\n          scopeParent.generateUid(\"computedKey\"),\n        )!;\n        setterKey = t.cloneNode(getterKey.left as t.Identifier);\n      } else {\n        getterKey = t.cloneNode(key);\n        setterKey = t.cloneNode(key);\n      }\n\n      assignIdForAnonymousClass(path, className);\n\n      addProxyAccessorsFor(\n        path.node.id,\n        newPath,\n        getterKey,\n        setterKey,\n        newId,\n        computed,\n        isStatic,\n        version,\n      );\n    }\n\n    if (\"computed\" in element.node && element.node.computed) {\n      hasComputedKeysSideEffects ||= !scopeParent.isStatic(element.node.key);\n    }\n  }\n\n  if (!classDecorators && !hasElementDecorators) {\n    if (!path.node.id && typeof className === \"string\") {\n      path.node.id = t.identifier(className);\n    }\n    if (setClassName) {\n      path.node.body.body.unshift(\n        createStaticBlockFromExpressions([\n          createSetFunctionNameCall(state, setClassName),\n        ]),\n      );\n    }\n    // If nothing is decorated and no assignments inserted, return\n    return;\n  }\n\n  const elementDecoratorInfo: DecoratorInfo[] = [];\n\n  let constructorPath: NodePath<t.ClassMethod> | undefined;\n  const decoratedPrivateMethods = new Set<string>();\n\n  let classInitLocal: t.Identifier, classIdLocal: t.Identifier;\n  let decoratorReceiverId: t.Identifier | null = null;\n\n  // Memoise the this value `a.b` of decorator member expressions `@a.b.dec`,\n  type HandleDecoratorsResult = {\n    // whether the whole decorator list requires memoisation\n    hasSideEffects: boolean;\n    usesFnContext: boolean;\n    // the this value of each decorator if applicable\n    decoratorsThis: (t.Expression | undefined)[];\n  };\n  function handleDecorators(decorators: t.Decorator[]): HandleDecoratorsResult {\n    let hasSideEffects = false;\n    let usesFnContext = false;\n    const decoratorsThis: (t.Expression | null)[] = [];\n    for (const decorator of decorators) {\n      const { expression } = decorator;\n      let object;\n      if (\n        (version === \"2023-11\" ||\n          (!process.env.BABEL_8_BREAKING && version === \"2023-05\")) &&\n        t.isMemberExpression(expression)\n      ) {\n        if (t.isSuper(expression.object)) {\n          object = t.thisExpression();\n        } else if (scopeParent.isStatic(expression.object)) {\n          object = t.cloneNode(expression.object);\n        } else {\n          decoratorReceiverId ??= generateLetUidIdentifier(scopeParent, \"obj\");\n          object = t.assignmentExpression(\n            \"=\",\n            t.cloneNode(decoratorReceiverId),\n            expression.object,\n          );\n          expression.object = t.cloneNode(decoratorReceiverId);\n        }\n      }\n      decoratorsThis.push(object);\n      hasSideEffects ||= !scopeParent.isStatic(expression);\n      usesFnContext ||= usesFunctionContextOrYieldAwait(decorator);\n    }\n    return { hasSideEffects, usesFnContext, decoratorsThis };\n  }\n\n  const willExtractSomeElemDecs =\n    hasComputedKeysSideEffects ||\n    (process.env.BABEL_8_BREAKING\n      ? elemDecsUseFnContext\n      : elemDecsUseFnContext || version !== \"2023-11\");\n\n  let needsDeclaraionForClassBinding = false;\n  let classDecorationsFlag = 0;\n  let classDecorations: t.Expression[] = [];\n  let classDecorationsId: t.Identifier;\n  let computedKeyAssignments: t.AssignmentExpression[] = [];\n  if (classDecorators) {\n    classInitLocal = generateLetUidIdentifier(scopeParent, \"initClass\");\n    needsDeclaraionForClassBinding = path.isClassDeclaration();\n    ({ id: classIdLocal, path } = replaceClassWithVar(path, className));\n\n    path.node.decorators = null;\n\n    const classDecsUsePrivateName = classDecorators.some(usesPrivateField);\n    const { hasSideEffects, usesFnContext, decoratorsThis } =\n      handleDecorators(classDecorators);\n\n    const { haveThis, decs } = generateDecorationList(\n      classDecorators,\n      decoratorsThis,\n      version,\n    );\n    classDecorationsFlag = haveThis ? 1 : 0;\n    classDecorations = decs;\n\n    if (\n      usesFnContext ||\n      (hasSideEffects && willExtractSomeElemDecs) ||\n      classDecsUsePrivateName\n    ) {\n      classDecorationsId = memoiseExpression(\n        t.arrayExpression(classDecorations),\n        \"classDecs\",\n        classAssignments,\n      );\n    }\n\n    if (!hasElementDecorators) {\n      // Sync body paths as non-decorated computed accessors have been transpiled\n      // to getter-setter pairs.\n      for (const element of path.get(\"body.body\")) {\n        const { node } = element;\n        const isComputed = \"computed\" in node && node.computed;\n        if (isComputed) {\n          if (element.isClassProperty({ static: true })) {\n            if (!element.get(\"key\").isConstantExpression()) {\n              const key = (node as t.ClassProperty).key;\n              const maybeAssignment = memoiseComputedKey(\n                key,\n                scopeParent,\n                scopeParent.generateUid(\"computedKey\"),\n              );\n              if (maybeAssignment != null) {\n                // If it is a static computed field within a decorated class, we move the computed key\n                // into `computedKeyAssignments` which will be then moved into the non-static class,\n                // to ensure that the evaluation order and private environment are correct\n                node.key = t.cloneNode(maybeAssignment.left);\n                computedKeyAssignments.push(maybeAssignment);\n              }\n            }\n          } else if (computedKeyAssignments.length > 0) {\n            prependExpressionsToComputedKey(\n              computedKeyAssignments,\n              element as NodePath<ClassElementCanHaveComputedKeys>,\n            );\n            computedKeyAssignments = [];\n          }\n        }\n      }\n    }\n  } else {\n    assignIdForAnonymousClass(path, className);\n    classIdLocal = t.cloneNode(path.node.id);\n  }\n\n  let lastInstancePrivateName: t.PrivateName;\n  let needsInstancePrivateBrandCheck = false;\n\n  let fieldInitializerExpressions = [];\n  let staticFieldInitializerExpressions: t.Expression[] = [];\n\n  if (hasElementDecorators) {\n    if (protoInitLocal) {\n      const protoInitCall = t.callExpression(t.cloneNode(protoInitLocal), [\n        t.thisExpression(),\n      ]);\n      fieldInitializerExpressions.push(protoInitCall);\n    }\n    for (const element of body) {\n      if (!isClassDecoratableElementPath(element)) {\n        if (\n          staticFieldInitializerExpressions.length > 0 &&\n          element.isStaticBlock()\n        ) {\n          prependExpressionsToStaticBlock(\n            staticFieldInitializerExpressions,\n            element,\n          );\n          staticFieldInitializerExpressions = [];\n        }\n        continue;\n      }\n\n      const { node } = element;\n      const decorators = node.decorators;\n\n      const hasDecorators = !!decorators?.len