Remove unnecessary Store subclass.

packages/babel-core/src/transformation/file/index.js

@@ -9,7 +9,6 @@ import sourceMap from "source-map";
 import generate from "babel-generator";
 import { codeFrameColumns } from "babel-code-frame";
 import traverse from "babel-traverse";
-import Store from "../store";
 import { parse } from "babylon";
 import * as t from "babel-types";
 import buildDebug from "debug";
@@ -38,7 +37,7 @@ const errorVisitor = {
   },
 };
 
-export default class File extends Store {
+export default class File {
   constructor({ options, passes }: ResolvedConfig) {
     if (!INTERNAL_PLUGINS) {
       // Lazy-init the internal plugin to remove the init-time circular dependency between plugins being
@@ -49,8 +48,7 @@ export default class File extends Store {
       }).passes[0];
     }
 
-    super();
-
+    this._map = new Map();
     this.pluginPasses = passes;
     this.opts = options;
 
@@ -113,6 +111,14 @@ export default class File extends Store {
   code: string;
   shebang: string;
 
+  set(key: string, val) {
+    this._map.set(key, val);
+  }
+
+  get(key: string): any {
+    return this._map.get(key);
+  }
+
   getMetadata() {
     let has = false;
     for (const node of (this.ast.program.body: Array<Object>)) {

packages/babel-core/src/transformation/plugin-pass.js

@@ -1,9 +1,8 @@
-import Store from "./store";
 import File from "./file";
 
-export default class PluginPass extends Store {
+export default class PluginPass {
   constructor(file: File, key: string, options: Object = {}) {
-    super();
+    this._map = new Map();
 
     this.key = key;
     this.file = file;
@@ -14,6 +13,14 @@ export default class PluginPass extends Store {
   file: File;
   opts: Object;
 
+  set(key: string, val) {
+    this._map.set(key, val);
+  }
+
+  get(key: string): any {
+    return this._map.get(key);
+  }
+
   addHelper(...args) {
     return this.file.addHelper(...args);
   }

packages/babel-core/src/transformation/store.js

@@ -1,15 +0,0 @@
-export default class Store {
-  constructor() {
-    this._map = new Map();
-  }
-
-  set(key: string, val) {
-    this._map.set(key, val);
-  }
-
-  get(key: string): any {
-    if (this._map.has(key)) {
-      return this._map.get(key);
-    }
-  }
-}