Don't transform declare class in plugin-proposal-class-properties

packages/babel-core/src/config/full.ts

@@ -92,7 +92,7 @@ export default gensync<(inputOpts: unknown) => ResolvedConfig | null>(
       function* recursePresetDescriptors(
         rawPresets: Array<UnloadedDescriptor>,
         pluginDescriptorsPass: Array<UnloadedDescriptor>,
-      ) {
+      ): Handler<true | void> {
         const presets: Array<{
           preset: ConfigChain | null;
           pass: Array<UnloadedDescriptor>;

packages/babel-helper-create-class-features-plugin/src/index.ts

@@ -18,6 +18,7 @@ import {
   FEATURES,
   isLoose,
 } from "./features";
+import { assertFieldTransformed } from "./typescript";
 
 export { FEATURES, enableFeature, injectInitialization };
 
@@ -98,6 +99,8 @@ export function createClassFeaturePlugin({
 
         verifyUsedFeatures(path, this.file);
 
+        if (path.isClassDeclaration()) assertFieldTransformed(path);
+
         const loose = isLoose(this.file, feature);
 
         let constructor: NodePath<t.ClassMethod>;

packages/babel-helper-create-class-features-plugin/src/typescript.ts

@@ -1,7 +1,9 @@
 import type { NodePath } from "@babel/traverse";
 import type * as t from "@babel/types";
 
-export function assertFieldTransformed(path: NodePath<t.ClassProperty>) {
+export function assertFieldTransformed(
+  path: NodePath<t.ClassProperty | t.ClassDeclaration>,
+) {
   // TODO (Babel 8): Also check path.node.definite
 
   if (path.node.declare) {

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/typescript-declare-class-property/input.ts

@@ -0,0 +1,3 @@
+declare class Foo {
+  static bar: string;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/typescript-declare-class-property/options.json

@@ -0,0 +1,5 @@
+{
+  "presets": ["typescript"],
+  "plugins": ["proposal-class-properties"],
+  "throws": "TypeScript 'declare' fields must first be transformed by @babel/plugin-transform-typescript."
+}

packages/babel-plugin-transform-typescript/src/const-enum.ts

@@ -3,8 +3,9 @@ import type { NodePath } from "@babel/traverse";
 
 import { translateEnumValues } from "./enum";
 
+export type NodePathConstEnum = NodePath<t.TSEnumDeclaration & { const: true }>;
 export default function transpileConstEnum(
-  path: NodePath<t.TSEnumDeclaration & { const: true }>,
+  path: NodePathConstEnum,
   t: typeof import("@babel/types"),
 ) {
   const { name } = path.node.id;

packages/babel-plugin-transform-typescript/src/index.ts

@@ -1,22 +1,26 @@
 import { declare } from "@babel/helper-plugin-utils";
 import syntaxTypeScript from "@babel/plugin-syntax-typescript";
 import { types as t, template } from "@babel/core";
+import type { PluginPass } from "@babel/core";
 import { injectInitialization } from "@babel/helper-create-class-features-plugin";
+import type { NodePath, Visitor } from "@babel/traverse";
 
-import transpileConstEnum from "./const-enum";
+import transpileConstEnum, { NodePathConstEnum } from "./const-enum";
 import transpileEnum from "./enum";
 import transpileNamespace from "./namespace";
-import type { NodePath } from "@babel/traverse";
 
-function isInType(path) {
+function isInType(path: NodePath) {
   switch (path.parent.type) {
     case "TSTypeReference":
     case "TSQualifiedName":
     case "TSExpressionWithTypeArguments":
     case "TSTypeQuery":
       return true;
     case "ExportSpecifier":
-      return path.parentPath.parent.exportKind === "type";
+      return (
+        (path.parentPath.parent as t.ExportNamedDeclaration).exportKind ===
+        "type"
+      );
     default:
       return false;
   }
@@ -29,7 +33,7 @@ const GLOBAL_TYPES = new WeakMap();
 const NEEDS_EXPLICIT_ESM = new WeakMap();
 const PARSED_PARAMS = new WeakSet();
 
-function isGlobalType(path, name) {
+function isGlobalType(path: NodePath, name: string) {
   const program = path.find(path => path.isProgram()).node;
   if (path.scope.hasOwnBinding(name)) return false;
   if (GLOBAL_TYPES.get(program).has(name)) return true;
@@ -47,11 +51,34 @@ function isGlobalType(path, name) {
   return false;
 }
 
-function registerGlobalType(programNode, name) {
+function registerGlobalType(programNode: t.Program, name: string) {
   GLOBAL_TYPES.get(programNode).add(name);
 }
-
-export default declare((api, opts) => {
+export interface Options {
+  /** @default true */
+  allowNamespaces?: boolean;
+  /** @default "React.createElement" */
+  jsxPragma?: string;
+  /** @default "React.Fragment" */
+  jsxPragmaFrag?: string;
+  onlyRemoveTypeImports?: boolean;
+  optimizeConstEnums?: boolean;
+  allowDeclareFields?: boolean;
+}
+type ConfigAPI = { assertVersion: (range: string | number) => void };
+interface Plugin {
+  name: string;
+  visitor: Visitor<PluginPass>;
+  inherits: typeof syntaxTypeScript;
+}
+type ExtraNodeProps = {
+  declare?: unknown;
+  accessibility?: unknown;
+  abstract?: unknown;
+  optional?: unknown;
+  override?: unknown;
+};
+export default declare((api: ConfigAPI, opts: Options): Plugin => {
   api.assertVersion(7);
 
   const JSX_PRAGMA_REGEX = /\*?\s*@jsx((?:Frag)?)\s+([^\s]+)/;
@@ -70,7 +97,11 @@ export default declare((api, opts) => {
   }
 
   const classMemberVisitors = {
-    field(path) {
+    field(
+      path: NodePath<
+        (t.ClassPrivateProperty | t.ClassProperty) & ExtraNodeProps
+      >,
+    ) {
       const { node } = path;
 
       if (!process.env.BABEL_8_BREAKING) {
@@ -302,7 +333,11 @@ export default declare((api, opts) => {
               (stmt.isTSModuleDeclaration({ declare: true }) &&
                 stmt.get("id").isIdentifier())
             ) {
-              registerGlobalType(programNode, stmt.node.id.name);
+              registerGlobalType(
+                programNode,
+                //@ts-expect-error
+                stmt.node.id.name,
+              );
             }
           }
         },
@@ -339,8 +374,10 @@ export default declare((api, opts) => {
         if (
           !path.node.source &&
           path.node.specifiers.length > 0 &&
-          path.node.specifiers.every(({ local }) =>
-            isGlobalType(path, local.name),
+          path.node.specifiers.every(
+            specifier =>
+              t.isExportSpecifier(specifier) &&
+              isGlobalType(path, specifier.local.name),
           )
         ) {
           path.remove();
@@ -352,7 +389,9 @@ export default declare((api, opts) => {
 
       ExportSpecifier(path) {
         // remove type exports
-        if (!path.parent.source && isGlobalType(path, path.node.local.name)) {
+        type Parent = t.ExportDeclaration & { source?: t.StringLiteral };
+        const parent = path.parent as Parent;
+        if (!parent.source && isGlobalType(path, path.node.local.name)) {
           path.remove();
         }
       },
@@ -406,7 +445,7 @@ export default declare((api, opts) => {
       },
 
       Class(path) {
-        const { node } = path;
+        const { node }: { node: typeof path.node & ExtraNodeProps } = path;
 
         if (node.typeParameters) node.typeParameters = null;
         if (node.superTypeParameters) node.superTypeParameters = null;
@@ -469,7 +508,7 @@ export default declare((api, opts) => {
 
       TSEnumDeclaration(path) {
         if (optimizeConstEnums && path.node.const) {
-          transpileConstEnum(path, t);
+          transpileConstEnum(path as NodePathConstEnum, t);
         } else {
           transpileEnum(path, t);
         }
@@ -510,7 +549,7 @@ export default declare((api, opts) => {
       },
 
       TSAsExpression(path) {
-        let { node } = path;
+        let { node }: { node: t.Expression } = path;
         do {
           node = node.expression;
         } while (t.isTSAsExpression(node));