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ReactHotLoaderTransformer.ts
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ReactHotLoaderTransformer.ts
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import {IdentifierRole, isTopLevelDeclaration} from "../parser/tokenizer";
import type TokenProcessor from "../TokenProcessor";
import Transformer from "./Transformer";
export default class ReactHotLoaderTransformer extends Transformer {
private extractedDefaultExportName: string | null = null;
constructor(readonly tokens: TokenProcessor, readonly filePath: string) {
super();
}
setExtractedDefaultExportName(extractedDefaultExportName: string): void {
this.extractedDefaultExportName = extractedDefaultExportName;
}
getPrefixCode(): string {
return `
(function () {
var enterModule = require('react-hot-loader').enterModule;
enterModule && enterModule(module);
})();`
.replace(/\s+/g, " ")
.trim();
}
getSuffixCode(): string {
const topLevelNames = new Set<string>();
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(): boolean {
return false;
}
}