Make @babel/plugin-class-features a normal helper package (#9083)

* Make @babel/plugin-class-features a normal helper package

This effectively disallows using it directly.

* Rename helper

* Style

* Don't add prefix to plugin name

* Move private methods plugin

packages/babel-helper-create-class-features-plugin/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@babel/plugin-class-features",
+  "name": "@babel/helper-create-class-features-plugin",
   "version": "7.1.4",
   "author": "The Babel Team (https://babeljs.io/team)",
   "license": "MIT",

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

@@ -1,4 +1,3 @@
-import { declare } from "@babel/helper-plugin-utils";
 import nameFunction from "@babel/helper-function-name";
 import { types as t } from "@babel/core";
 import {
@@ -12,13 +11,12 @@ import {
   enableFeature,
   verifyUsedFeatures,
   FEATURES,
-  setLoose,
   isLoose,
 } from "./features";
 
 import pkg from "../package.json";
 
-export { enableFeature, FEATURES, setLoose };
+export { FEATURES };
 
 // Note: Versions are represented as an integer. e.g. 7.1.5 is represented
 //       as 70000100005. This method is easier than using a semver-parsing
@@ -27,60 +25,22 @@ export { enableFeature, FEATURES, setLoose };
 const version = pkg.version.split(".").reduce((v, x) => v * 1e5 + +x, 0);
 const versionKey = "@babel/plugin-class-features/version";
 
-const getFeatureOptions = (options, name) => {
-  const value = options[name];
-
-  if (value === undefined || value === false) return { enabled: false };
-  if (value === true) return { enabled: true, loose: false };
-
-  if (typeof value === "object") {
-    if (
-      typeof value.loose !== "undefined" &&
-      typeof value.loose !== "boolean"
-    ) {
-      throw new Error(`.${name}.loose must be a boolean or undefined.`);
-    }
-
-    return { enabled: true, loose: !!value.loose };
-  }
-
-  throw new Error(
-    `.${name} must be a boolean, an object with a 'loose'` +
-      ` property or undefined.`,
-  );
-};
-
-export default declare((api, options) => {
-  api.assertVersion(7);
-
-  const fields = getFeatureOptions(options, "fields");
-  const privateMethods = getFeatureOptions(options, "privateMethods");
-  const decorators = getFeatureOptions(options, "decorators");
-
+export function createClassFeaturePlugin({
+  name,
+  feature,
+  loose,
+  manipulateOptions,
+}) {
   return {
-    name: "class-features",
-
-    manipulateOptions(opts, parserOpts) {
-      if (fields) {
-        parserOpts.plugins.push("classProperties", "classPrivateProperties");
-      }
-    },
+    name,
+    manipulateOptions,
 
     pre() {
+      enableFeature(this.file, feature, loose);
+
       if (!this.file.get(versionKey) || this.file.get(versionKey) < version) {
         this.file.set(versionKey, version);
       }
-
-      if (fields.enabled) {
-        enableFeature(this.file, FEATURES.fields, fields.loose);
-      }
-      if (privateMethods.enabled) {
-        enableFeature(this.file, FEATURES.privateMethods);
-      }
-      if (decorators.enabled) {
-        throw new Error("Decorators are not supported yet");
-        enableFeature(this.file, FEATURES.decorators);
-      }
     },
 
     visitor: {
@@ -203,4 +163,4 @@ export default declare((api, options) => {
       },
     },
   };
-});
+}

packages/babel-plugin-proposal-class-properties/package.json

@@ -13,7 +13,7 @@
   ],
   "dependencies": {
     "@babel/helper-plugin-utils": "^7.0.0",
-    "@babel/plugin-class-features": "^7.1.4"
+    "@babel/helper-create-class-features-plugin": "^7.1.4"
   },
   "peerDependencies": {
     "@babel/core": "^7.0.0-0"

packages/babel-plugin-proposal-class-properties/src/index.js

@@ -1,25 +1,22 @@
+/* eslint-disable local-rules/plugin-name */
+
 import { declare } from "@babel/helper-plugin-utils";
-import pluginClassFeatures, {
-  enableFeature,
+import {
+  createClassFeaturePlugin,
   FEATURES,
-} from "@babel/plugin-class-features";
+} from "@babel/helper-create-class-features-plugin";
 
 export default declare((api, options) => {
   api.assertVersion(7);
 
-  const { loose } = options;
-
-  return {
+  return createClassFeaturePlugin({
     name: "proposal-class-properties",
 
-    inherits: pluginClassFeatures,
+    feature: FEATURES.fields,
+    loose: options.loose,
 
     manipulateOptions(opts, parserOpts) {
       parserOpts.plugins.push("classProperties", "classPrivateProperties");
     },
-
-    pre() {
-      enableFeature(this.file, FEATURES.fields, loose);
-    },
-  };
+  });
 });

packages/babel-plugin-proposal-private-methods/package.json

@@ -13,7 +13,7 @@
   ],
   "dependencies": {
     "@babel/helper-plugin-utils": "^7.0.0",
-    "@babel/plugin-class-features": "^7.1.4"
+    "@babel/helper-create-class-features-plugin": "^7.1.4"
   },
   "peerDependencies": {
     "@babel/core": "^7.0.0-0"

packages/babel-plugin-proposal-private-methods/src/index.js

@@ -1,25 +1,22 @@
+/* eslint-disable local-rules/plugin-name */
+
 import { declare } from "@babel/helper-plugin-utils";
-import pluginClassFeatures, {
-  enableFeature,
+import {
+  createClassFeaturePlugin,
   FEATURES,
-} from "@babel/plugin-class-features";
+} from "@babel/helper-create-class-features-plugin";
 
 export default declare((api, options) => {
   api.assertVersion(7);
 
-  const { loose } = options;
-
-  return {
+  return createClassFeaturePlugin({
     name: "proposal-private-methods",
 
-    inherits: pluginClassFeatures,
+    feature: FEATURES.privateMethods,
+    loose: options.loose,
 
     manipulateOptions(opts, parserOpts) {
       parserOpts.plugins.push("classPrivateMethods");
     },
-
-    pre() {
-      enableFeature(this.file, FEATURES.privateMethods, loose);
-    },
-  };
+  });
 });