add hw2

node_modules/sucrase/dist/esm/transformers/ReactHotLoaderTransformer.js

@@ -0,0 +1,69 @@
+import {IdentifierRole, isTopLevelDeclaration} from "../parser/tokenizer";
+
+import Transformer from "./Transformer";
+
+export default class ReactHotLoaderTransformer extends Transformer {
+   __init() {this.extractedDefaultExportName = null}
+
+  constructor( tokens,  filePath) {
+    super();this.tokens = tokens;this.filePath = filePath;ReactHotLoaderTransformer.prototype.__init.call(this);;
+  }
+
+  setExtractedDefaultExportName(extractedDefaultExportName) {
+    this.extractedDefaultExportName = extractedDefaultExportName;
+  }
+
+  getPrefixCode() {
+    return `
+      (function () {
+        var enterModule = require('react-hot-loader').enterModule;
+        enterModule && enterModule(module);
+      })();`
+      .replace(/\s+/g, " ")
+      .trim();
+  }
+
+  getSuffixCode() {
+    const topLevelNames = new Set();
+    for (const token of this.tokens.tokens) {
+      if (
+        !token.isType &&
+        isTopLevelDeclaration(token) &&
+        token.identifierRole !== IdentifierRole.ImportDeclaration
+      ) {
+        topLevelNames.add(this.tokens.identifierNameForToken(token));
+      }
+    }
+    const namesToRegister = Array.from(topLevelNames).map((name) => ({
+      variableName: name,
+      uniqueLocalName: name,
+    }));
+    if (this.extractedDefaultExportName) {
+      namesToRegister.push({
+        variableName: this.extractedDefaultExportName,
+        uniqueLocalName: "default",
+      });
+    }
+    return `
+;(function () {
+  var reactHotLoader = require('react-hot-loader').default;
+  var leaveModule = require('react-hot-loader').leaveModule;
+  if (!reactHotLoader) {
+    return;
+  }
+${namesToRegister
+  .map(
+    ({variableName, uniqueLocalName}) =>
+      `  reactHotLoader.register(${variableName}, "${uniqueLocalName}", ${JSON.stringify(
+        this.filePath || "",
+      )});`,
+  )
+  .join("\n")}
+  leaveModule(module);
+})();`;
+  }
+
+  process() {
+    return false;
+  }
+}