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@tanstack/router-plugin

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Modern and scalable routing for React applications

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{"version":3,"file":"compilers.cjs","sources":["../../../../src/core/code-splitter/compilers.ts"],"sourcesContent":["import * as t from '@babel/types'\nimport babel from '@babel/core'\nimport * as template from '@babel/template'\nimport {\n deadCodeElimination,\n findReferencedIdentifiers,\n} from 'babel-dead-code-elimination'\nimport { generateFromAst, parseAst } from '@tanstack/router-utils'\nimport { tsrSplit } from '../constants'\nimport { routeHmrStatement } from '../route-hmr-statement'\nimport { createIdentifier } from './path-ids'\nimport { getFrameworkOptions } from './framework-options'\nimport type { GeneratorResult, ParseAstOptions } from '@tanstack/router-utils'\nimport type { CodeSplitGroupings, SplitRouteIdentNodes } from '../constants'\nimport type { Config, DeletableNodes } from '../config'\n\ntype SplitNodeMeta = {\n routeIdent: SplitRouteIdentNodes\n splitStrategy: 'lazyFn' | 'lazyRouteComponent'\n localImporterIdent: string\n exporterIdent: string\n localExporterIdent: string\n}\nconst SPLIT_NODES_CONFIG = new Map<SplitRouteIdentNodes, SplitNodeMeta>([\n [\n 'loader',\n {\n routeIdent: 'loader',\n localImporterIdent: '$$splitLoaderImporter', // const $$splitLoaderImporter = () => import('...')\n splitStrategy: 'lazyFn',\n localExporterIdent: 'SplitLoader', // const SplitLoader = ...\n exporterIdent: 'loader', // export { SplitLoader as loader }\n },\n ],\n [\n 'component',\n {\n routeIdent: 'component',\n localImporterIdent: '$$splitComponentImporter', // const $$splitComponentImporter = () => import('...')\n splitStrategy: 'lazyRouteComponent',\n localExporterIdent: 'SplitComponent', // const SplitComponent = ...\n exporterIdent: 'component', // export { SplitComponent as component }\n },\n ],\n [\n 'pendingComponent',\n {\n routeIdent: 'pendingComponent',\n localImporterIdent: '$$splitPendingComponentImporter', // const $$splitPendingComponentImporter = () => import('...')\n splitStrategy: 'lazyRouteComponent',\n localExporterIdent: 'SplitPendingComponent', // const SplitPendingComponent = ...\n exporterIdent: 'pendingComponent', // export { SplitPendingComponent as pendingComponent }\n },\n ],\n [\n 'errorComponent',\n {\n routeIdent: 'errorComponent',\n localImporterIdent: '$$splitErrorComponentImporter', // const $$splitErrorComponentImporter = () => import('...')\n splitStrategy: 'lazyRouteComponent',\n localExporterIdent: 'SplitErrorComponent', // const SplitErrorComponent = ...\n exporterIdent: 'errorComponent', // export { SplitErrorComponent as errorComponent }\n },\n ],\n [\n 'notFoundComponent',\n {\n routeIdent: 'notFoundComponent',\n localImporterIdent: '$$splitNotFoundComponentImporter', // const $$splitNotFoundComponentImporter = () => import('...')\n splitStrategy: 'lazyRouteComponent',\n localExporterIdent: 'SplitNotFoundComponent', // const SplitNotFoundComponent = ...\n exporterIdent: 'notFoundComponent', // export { SplitNotFoundComponent as notFoundComponent }\n },\n ],\n])\nconst KNOWN_SPLIT_ROUTE_IDENTS = [...SPLIT_NODES_CONFIG.keys()] as const\n\nfunction addSplitSearchParamToFilename(\n filename: string,\n grouping: Array<string>,\n) {\n const [bareFilename] = filename.split('?')\n\n const params = new URLSearchParams()\n params.append(tsrSplit, createIdentifier(grouping))\n\n const result = `${bareFilename}?${params.toString()}`\n return result\n}\n\nfunction removeSplitSearchParamFromFilename(filename: string) {\n const [bareFilename] = filename.split('?')\n return bareFilename!\n}\n\nconst splittableCreateRouteFns = ['createFileRoute']\nconst unsplittableCreateRouteFns = [\n 'createRootRoute',\n 'createRootRouteWithContext',\n]\nconst allCreateRouteFns = [\n ...splittableCreateRouteFns,\n ...unsplittableCreateRouteFns,\n]\n\nexport function compileCodeSplitReferenceRoute(\n opts: ParseAstOptions & {\n codeSplitGroupings: CodeSplitGroupings\n deleteNodes?: Set<DeletableNodes>\n targetFramework: Config['target']\n filename: string\n id: string\n addHmr?: boolean\n },\n): GeneratorResult | null {\n const ast = parseAst(opts)\n\n const refIdents = findReferencedIdentifiers(ast)\n\n const knownExportedIdents = new Set<string>()\n\n function findIndexForSplitNode(str: string) {\n return opts.codeSplitGroupings.findIndex((group) =>\n group.includes(str as any),\n )\n }\n\n const frameworkOptions = getFrameworkOptions(opts.targetFramework)\n const PACKAGE = frameworkOptions.package\n const LAZY_ROUTE_COMPONENT_IDENT = frameworkOptions.idents.lazyRouteComponent\n const LAZY_FN_IDENT = frameworkOptions.idents.lazyFn\n\n let createRouteFn: string\n\n let modified = false as boolean\n let hmrAdded = false as boolean\n babel.traverse(ast, {\n Program: {\n enter(programPath) {\n /**\n * If the component for the route is being imported from\n * another file, this is to track the path to that file\n * the path itself doesn't matter, we just need to keep\n * track of it so that we can remove it from the imports\n * list if it's not being used like:\n *\n * `import '../shared/imported'`\n */\n const removableImportPaths = new Set<string>([])\n\n programPath.traverse({\n CallExpression: (path) => {\n if (!t.isIdentifier(path.node.callee)) {\n return\n }\n\n if (!allCreateRouteFns.includes(path.node.callee.name)) {\n return\n }\n\n createRouteFn = path.node.callee.name\n\n function babelHandleReference(routeOptions: t.Node | undefined) {\n const hasImportedOrDefinedIdentifier = (name: string) => {\n return programPath.scope.hasBinding(name)\n }\n\n if (t.isObjectExpression(routeOptions)) {\n if (opts.deleteNodes && opts.deleteNodes.size > 0) {\n routeOptions.properties = routeOptions.properties.filter(\n (prop) => {\n if (t.isObjectProperty(prop)) {\n if (t.isIdentifier(prop.key)) {\n if (opts.deleteNodes!.has(prop.key.name as any)) {\n modified = true\n return false\n }\n }\n }\n return true\n },\n )\n }\n if (!splittableCreateRouteFns.includes(createRouteFn)) {\n // we can't split this route but we still add HMR handling if enabled\n if (opts.addHmr && !hmrAdded) {\n programPath.pushContainer('body', routeHmrStatement)\n modified = true\n hmrAdded = true\n }\n // exit traversal so this route is not split\n return programPath.stop()\n }\n routeOptions.properties.forEach((prop) => {\n if (t.isObjectProperty(prop)) {\n if (t.isIdentifier(prop.key)) {\n const key = prop.key.name\n\n // If the user has not specified a split grouping for this key\n // then we should not split it\n const codeSplitGroupingByKey = findIndexForSplitNode(key)\n if (codeSplitGroupingByKey === -1) {\n return\n }\n const codeSplitGroup = [\n ...new Set(\n opts.codeSplitGroupings[codeSplitGroupingByKey],\n ),\n ]\n\n // find key in nodeSplitConfig\n const isNodeConfigAvailable = SPLIT_NODES_CONFIG.has(\n key as any,\n )\n\n if (!isNodeConfigAvailable) {\n return\n }\n\n // Exit early if the value is a boolean, null, or undefined.\n // These values mean \"don't use this component, fallback to parent\"\n // No code splitting needed to preserve fallback behavior\n if (\n t.isBooleanLiteral(prop.value) ||\n t.isNullLiteral(prop.value) ||\n (t.isIdentifier(prop.value) &&\n prop.value.name === 'undefined')\n ) {\n return\n }\n\n const splitNodeMeta = SPLIT_NODES_CONFIG.get(key as any)!\n\n // We need to extract the existing search params from the filename, if any\n // and add the relevant codesplitPrefix to them, then write them back to the filename\n const splitUrl = addSplitSearchParamToFilename(\n opts.filename,\n codeSplitGroup,\n )\n\n if (\n splitNodeMeta.splitStrategy === 'lazyRouteComponent'\n ) {\n const value = prop.value\n\n let shouldSplit = true\n\n if (t.isIdentifier(value)) {\n const existingImportPath =\n getImportSpecifierAndPathFromLocalName(\n programPath,\n value.name,\n ).path\n if (existingImportPath) {\n removableImportPaths.add(existingImportPath)\n }\n\n // exported identifiers should not be split\n // since they are already being imported\n // and need to be retained in the compiled file\n const isExported = hasExport(ast, value)\n if (isExported) {\n knownExportedIdents.add(value.name)\n }\n shouldSplit = !isExported\n\n if (shouldSplit) {\n removeIdentifierLiteral(path, value)\n }\n }\n\n if (!shouldSplit) {\n return\n }\n\n modified = true\n\n // Prepend the import statement to the program along with the importer function\n // Check to see if lazyRouteComponent is already imported before attempting\n // to import it again\n if (\n !hasImportedOrDefinedIdentifier(\n LAZY_ROUTE_COMPONENT_IDENT,\n )\n ) {\n programPath.unshiftContainer('body', [\n template.statement(\n `import { ${LAZY_ROUTE_COMPONENT_IDENT} } from '${PACKAGE}'`,\n )(),\n ])\n }\n\n // Check to see if the importer function is already defined\n // If not, define it with the dynamic import statement\n if (\n !hasImportedOrDefinedIdentifier(\n splitNodeMeta.localImporterIdent,\n )\n ) {\n programPath.unshiftContainer('body', [\n template.statement(\n `const ${splitNodeMeta.localImporterIdent} = () => import('${splitUrl}')`,\n )(),\n ])\n }\n\n prop.value = template.expression(\n `${LAZY_ROUTE_COMPONENT_IDENT}(${splitNodeMeta.localImporterIdent}, '${splitNodeMeta.exporterIdent}')`,\n )()\n\n // add HMR handling\n if (opts.addHmr && !hmrAdded) {\n programPath.pushContainer('body', routeHmrStatement)\n modified = true\n hmrAdded = true\n }\n } else {\n // if (splitNodeMeta.splitStrategy === 'lazyFn') {\n const value = prop.value\n\n let shouldSplit = true\n\n if (t.isIdentifier(value)) {\n const existingImportPath =\n getImportSpecifierAndPathFromLocalName(\n programPath,\n value.name,\n ).path\n if (existingImportPath) {\n removableImportPaths.add(existingImportPath)\n }\n\n // exported identifiers should not be split\n // since they are already being imported\n // and need to be retained in the compiled file\n const isExported = hasExport(ast, value)\n if (isExported) {\n knownExportedIdents.add(value.name)\n }\n shouldSplit = !isExported\n\n if (shouldSplit) {\n removeIdentifierLiteral(path, value)\n }\n }\n\n if (!shouldSplit) {\n return\n }\n modified = true\n\n // Prepend the import statement to the program along with the importer function\n if (!hasImportedOrDefinedIdentifier(LAZY_FN_IDENT)) {\n programPath.unshiftContainer(\n 'body',\n template.smart(\n `import { ${LAZY_FN_IDENT} } from '${PACKAGE}'`,\n )(),\n )\n }\n\n // Check to see if the importer function is already defined\n // If not, define it with the dynamic import statement\n if (\n !hasImportedOrDefinedIdentifier(\n splitNodeMeta.localImporterIdent,\n )\n ) {\n programPath.unshiftContainer('body', [\n template.statement(\n `const ${splitNodeMeta.localImporterIdent} = () => import('${splitUrl}')`,\n )(),\n ])\n }\n\n // Add the lazyFn call with the dynamic import to the prop value\n prop.value = template.expression(\n `${LAZY_FN_IDENT}(${splitNodeMeta.localImporterIdent}, '${splitNodeMeta.exporterIdent}')`,\n )()\n }\n }\n }\n\n programPath.scope.crawl()\n })\n }\n }\n\n if (t.isCallExpression(path.parentPath.node)) {\n // createFileRoute('/')({ ... })\n const options = resolveIdentifier(\n path,\n path.parentPath.node.arguments[0],\n )\n\n babelHandleReference(options)\n } else if (t.isVariableDeclarator(path.parentPath.node)) {\n // createFileRoute({ ... })\n const caller = resolveIdentifier(path, path.parentPath.node.init)\n\n if (t.isCallExpression(caller)) {\n const options = resolveIdentifier(path, caller.arguments[0])\n babelHandleReference(options)\n }\n }\n },\n })\n\n /**\n * If the component for the route is being imported,\n * and it's not being used, remove the import statement\n * from the program, by checking that the import has no\n * specifiers\n */\n if (removableImportPaths.size > 0) {\n modified = true\n programPath.traverse({\n ImportDeclaration(path) {\n if (path.node.specifiers.length > 0) return\n if (removableImportPaths.has(path.node.source.value)) {\n path.remove()\n }\n },\n })\n }\n },\n },\n })\n\n if (!modified) {\n return null\n }\n deadCodeElimination(ast, refIdents)\n\n // if there are exported identifiers, then we need to add a warning\n // to the file to let the user know that the exported identifiers\n // will not in the split file but in the original file, therefore\n // increasing the bundle size\n if (knownExportedIdents.size > 0) {\n const warningMessage = createNotExportableMessage(\n opts.filename,\n knownExportedIdents,\n )\n console.warn(warningMessage)\n\n // append this warning to the file using a template\n if (process.env.NODE_ENV !== 'production') {\n const warningTemplate = template.statement(\n `console.warn(${JSON.stringify(warningMessage)})`,\n )()\n ast.program.body.unshift(warningTemplate)\n }\n }\n\n return generateFromAst(ast, {\n sourceMaps: true,\n sourceFileName: opts.filename,\n filename: opts.filename,\n })\n}\n\nexport function compileCodeSplitVirtualRoute(\n opts: ParseAstOptions & {\n splitTargets: Array<SplitRouteIdentNodes>\n filename: string\n },\n): GeneratorResult {\n const ast = parseAst(opts)\n const refIdents = findReferencedIdentifiers(ast)\n\n const intendedSplitNodes = new Set(opts.splitTargets)\n\n const knownExportedIdents = new Set<string>()\n\n babel.traverse(ast, {\n Program: {\n enter(programPath) {\n const trackedNodesToSplitByType: Record<\n SplitRouteIdentNodes,\n { node: t.Node | undefined; meta: SplitNodeMeta } | undefined\n > = {\n component: undefined,\n loader: undefined,\n pendingComponent: undefined,\n errorComponent: undefined,\n notFoundComponent: undefined,\n }\n\n // Find and track all the known split-able nodes\n programPath.traverse({\n CallExpression: (path) => {\n if (!t.isIdentifier(path.node.callee)) {\n return\n }\n\n if (!splittableCreateRouteFns.includes(path.node.callee.name)) {\n return\n }\n\n function babelHandleVirtual(options: t.Node | undefined) {\n if (t.isObjectExpression(options)) {\n options.properties.forEach((prop) => {\n if (t.isObjectProperty(prop)) {\n // do not use `intendedSplitNodes` here\n // since we have special considerations that need\n // to be accounted for like (not splitting exported identifiers)\n KNOWN_SPLIT_ROUTE_IDENTS.forEach((splitType) => {\n if (\n !t.isIdentifier(prop.key) ||\n prop.key.name !== splitType\n ) {\n return\n }\n\n const value = prop.value\n\n // If the value for the `key` is `undefined`, then we don't need to include it\n // in the split file, so we can just return, since it will kept in-place in the\n // reference file\n // This is useful for cases like: `createFileRoute('/')({ component: undefined })`\n if (t.isIdentifier(value) && value.name === 'undefined') {\n return\n }\n\n let isExported = false\n if (t.isIdentifier(value)) {\n isExported = hasExport(ast, value)\n if (isExported) {\n knownExportedIdents.add(value.name)\n }\n }\n\n // If the node is exported, we need to remove\n // the export from the split file\n if (isExported && t.isIdentifier(value)) {\n removeExports(ast, value)\n } else {\n const meta = SPLIT_NODES_CONFIG.get(splitType)!\n trackedNodesToSplitByType[splitType] = {\n node: prop.value,\n meta,\n }\n }\n })\n }\n })\n\n // Remove all of the options\n options.properties = []\n }\n }\n\n if (t.isCallExpression(path.parentPath.node)) {\n // createFileRoute('/')({ ... })\n const options = resolveIdentifier(\n path,\n path.parentPath.node.arguments[0],\n )\n\n babelHandleVirtual(options)\n } else if (t.isVariableDeclarator(path.parentPath.node)) {\n // createFileRoute({ ... })\n const caller = resolveIdentifier(path, path.parentPath.node.init)\n\n if (t.isCallExpression(caller)) {\n const options = resolveIdentifier(path, caller.arguments[0])\n babelHandleVirtual(options)\n }\n }\n },\n })\n\n // Start the transformation to only exported the intended split nodes\n intendedSplitNodes.forEach((SPLIT_TYPE) => {\n const splitKey = trackedNodesToSplitByType[SPLIT_TYPE]\n\n if (!splitKey) {\n return\n }\n\n let splitNode = splitKey.node\n const splitMeta = { ...splitKey.meta, shouldRemoveNode: true }\n\n while (t.isIdentifier(splitNode)) {\n const binding = programPath.scope.getBinding(splitNode.name)\n splitNode = binding?.path.node\n }\n\n // Add the node to the program\n if (splitNode) {\n if (t.isFunctionDeclaration(splitNode)) {\n // an anonymous function declaration should only happen for `export default function() {...}`\n // so we should never get here\n if (!splitNode.id) {\n throw new Error(\n `Function declaration for \"${SPLIT_TYPE}\" must have an identifier.`,\n )\n }\n splitMeta.shouldRemoveNode = false\n splitMeta.localExporterIdent = splitNode.id.name\n } else if (\n t.isFunctionExpression(splitNode) ||\n t.isArrowFunctionExpression(splitNode)\n ) {\n programPath.pushContainer(\n 'body',\n t.variableDeclaration('const', [\n t.variableDeclarator(\n t.identifier(splitMeta.localExporterIdent),\n splitNode as any,\n ),\n ]),\n )\n } else if (\n t.isImportSpecifier(splitNode) ||\n t.isImportDefaultSpecifier(splitNode)\n ) {\n programPath.pushContainer(\n 'body',\n t.variableDeclaration('const', [\n t.variableDeclarator(\n t.identifier(splitMeta.localExporterIdent),\n splitNode.local,\n ),\n ]),\n )\n } else if (t.isVariableDeclarator(splitNode)) {\n if (t.isIdentifier(splitNode.id)) {\n splitMeta.localExporterIdent = splitNode.id.name\n splitMeta.shouldRemoveNode = false\n } else {\n throw new Error(\n `Unexpected splitNode type ☝️: ${splitNode.type}`,\n )\n }\n } else if (t.isCallExpression(splitNode)) {\n const outputSplitNodeCode = generateFromAst(splitNode).code\n const splitNodeAst = babel.parse(outputSplitNodeCode)\n\n if (!splitNodeAst) {\n throw new Error(\n `Failed to parse the generated code for \"${SPLIT_TYPE}\" in the node type \"${splitNode.type}\"`,\n )\n }\n\n const statement = splitNodeAst.program.body[0]\n\n if (!statement) {\n throw new Error(\n `Failed to parse the generated code for \"${SPLIT_TYPE}\" in the node type \"${splitNode.type}\" as no statement was found in the program body`,\n )\n }\n\n if (t.isExpressionStatement(statement)) {\n const expression = statement.expression\n programPath.pushContainer(\n 'body',\n t.variableDeclaration('const', [\n t.variableDeclarator(\n t.identifier(splitMeta.localExporterIdent),\n expression,\n ),\n ]),\n )\n } else {\n throw new Error(\n `Unexpected expression type encounter for \"${SPLIT_TYPE}\" in the node type \"${splitNode.type}\"`,\n )\n }\n } else if (t.isConditionalExpression(splitNode)) {\n programPath.pushContainer(\n 'body',\n t.variableDeclaration('const', [\n t.variableDeclarator(\n t.identifier(splitMeta.localExporterIdent),\n splitNode,\n ),\n ]),\n )\n } else if (t.isTSAsExpression(splitNode)) {\n // remove the type assertion\n splitNode = splitNode.expression\n programPath.pushContainer(\n 'body',\n t.variableDeclaration('const', [\n t.variableDeclarator(\n t.identifier(splitMeta.localExporterIdent),\n splitNode,\n ),\n ]),\n )\n } else if (t.isBooleanLiteral(splitNode)) {\n // Handle boolean literals\n // This exits early here, since this value will be kept in the reference file\n return\n } else if (t.isNullLiteral(splitNode)) {\n // Handle null literals\n // This exits early here, since this value will be kept in the reference file\n return\n } else {\n console.info('Unexpected splitNode type:', splitNode)\n throw new Error(`Unexpected splitNode type ☝️: ${splitNode.type}`)\n }\n }\n\n if (splitMeta.shouldRemoveNode) {\n // If the splitNode exists at the top of the program\n // then we need to remove that copy\n programPath.node.body = programPath.node.body.filter((node) => {\n return node !== splitNode\n })\n }\n\n // Export the node\n programPath.pushContainer('body', [\n t.exportNamedDeclaration(null, [\n t.exportSpecifier(\n t.identifier(splitMeta.localExporterIdent), // local variable name\n t.identifier(splitMeta.exporterIdent), // as what name it should be exported as\n ),\n ]),\n ])\n })\n\n // convert exports to imports from the original file\n programPath.traverse({\n ExportNamedDeclaration(path) {\n // e.g. export const x = 1 or export { x }\n // becomes\n // import { x } from '${opts.id}'\n\n if (path.node.declaration) {\n if (t.isVariableDeclaration(path.node.declaration)) {\n const importDecl = t.importDeclaration(\n path.node.declaration.declarations.map((decl) =>\n t.importSpecifier(\n t.identifier((decl.id as any).name),\n t.identifier((decl.id as any).name),\n ),\n ),\n t.stringLiteral(\n removeSplitSearchParamFromFilename(opts.filename),\n ),\n )\n\n path.replaceWith(importDecl)\n\n // Track the imported identifier paths so deadCodeElimination can remove them if unused\n // We need to traverse the newly created import to get the identifier paths\n path.traverse({\n Identifier(identPath) {\n // Only track the local binding identifiers (the imported names)\n if (\n identPath.parentPath.isImportSpecifier() &&\n identPath.key === 'local'\n ) {\n refIdents.add(identPath)\n }\n },\n })\n }\n }\n },\n })\n },\n },\n })\n\n deadCodeElimination(ast, refIdents)\n\n return generateFromAst(ast, {\n sourceMaps: true,\n sourceFileName: opts.filename,\n filename: opts.filename,\n })\n}\n\n/**\n * This function should read get the options from by searching for the key `codeSplitGroupings`\n * on createFileRoute and return it's values if it exists, else return undefined\n */\nexport function detectCodeSplitGroupingsFromRoute(opts: ParseAstOptions): {\n groupings: CodeSplitGroupings | undefined\n} {\n const ast = parseAst(opts)\n\n let codeSplitGroupings: CodeSplitGroupings | undefined = undefined\n\n babel.traverse(ast, {\n Program: {\n enter(programPath) {\n programPath.traverse({\n CallExpression(path) {\n if (!t.isIdentifier(path.node.callee)) {\n return\n }\n\n if (\n !(\n path.node.callee.name === 'createRoute' ||\n path.node.callee.name === 'createFileRoute'\n )\n ) {\n return\n }\n\n function babelHandleSplittingGroups(\n routeOptions: t.Node | undefined,\n ) {\n if (t.isObjectExpression(routeOptions)) {\n routeOptions.properties.forEach((prop) => {\n if (t.isObjectProperty(prop)) {\n if (t.isIdentifier(prop.key)) {\n if (prop.key.name === 'codeSplitGroupings') {\n const value = prop.value\n\n if (t.isArrayExpression(value)) {\n codeSplitGroupings = value.elements.map((group) => {\n if (t.isArrayExpression(group)) {\n return group.elements.map((node) => {\n if (!t.isStringLiteral(node)) {\n throw new Error(\n 'You must provide a string literal for the codeSplitGroupings',\n )\n }\n\n return node.value\n }) as Array<SplitRouteIdentNodes>\n }\n\n throw new Error(\n 'You must provide arrays with codeSplitGroupings options.',\n )\n })\n } else {\n throw new Error(\n 'You must provide an array of arrays for the codeSplitGroupings.',\n )\n }\n }\n }\n }\n })\n }\n }\n\n // Extracting the codeSplitGroupings\n if (t.isCallExpression(path.parentPath.node)) {\n // createFileRoute('/')({ ... })\n const options = resolveIdentifier(\n path,\n path.parentPath.node.arguments[0],\n )\n\n babelHandleSplittingGroups(options)\n } else if (t.isVariableDeclarator(path.parentPath.node)) {\n // createFileRoute({ ... })\n const caller = resolveIdentifier(path, path.parentPath.node.init)\n\n if (t.isCallExpression(caller)) {\n const options = resolveIdentifier(path, caller.arguments[0])\n babelHandleSplittingGroups(options)\n }\n }\n },\n })\n },\n },\n })\n\n return { groupings: codeSplitGroupings }\n}\n\nfunction createNotExportableMessage(\n filename: string,\n idents: Set<string>,\n): string {\n const list = Array.from(idents).map((d) => `- ${d}`)\n\n const message = [\n `[tanstack-router] These exports from \"${filename}\" will not be code-split and will increase your bundle size:`,\n ...list,\n 'For the best optimization, these items should either have their export statements removed, or be imported from another location that is not a route file.',\n ].join('\\n')\n\n return message\n}\n\nfunction getImportSpecifierAndPathFromLocalName(\n programPath: babel.NodePath<t.Program>,\n name: string,\n): {\n specifier:\n | t.ImportSpecifier\n | t.ImportDefaultSpecifier\n | t.ImportNamespaceSpecifier\n | null\n path: string | null\n} {\n let specifier:\n | t.ImportSpecifier\n | t.ImportDefaultSpecifier\n | t.ImportNamespaceSpecifier\n | null = null\n let path: string | null = null\n\n programPath.traverse({\n ImportDeclaration(importPath) {\n const found = importPath.node.specifiers.find(\n (targetSpecifier) => targetSpecifier.local.name === name,\n )\n if (found) {\n specifier = found\n path = importPath.node.source.value\n }\n },\n })\n\n return { specifier, path }\n}\n\n// Reusable function to get literal value or resolve variable to literal\nfunction resolveIdentifier(path: any, node: any): t.Node | undefined {\n if (t.isIdentifier(node)) {\n const binding = path.scope.getBinding(node.name)\n if (\n binding\n // && binding.kind === 'const'\n ) {\n const declarator = binding.path.node\n if (t.isObjectExpression(declarator.init)) {\n return declarator.init\n } else if (t.isFunctionDeclaration(declarator.init)) {\n return declarator.init\n }\n }\n return undefined\n }\n\n return node\n}\n\nfunction removeIdentifierLiteral(path: babel.NodePath, node: t.Identifier) {\n const binding = path.scope.getBinding(node.name)\n if (binding) {\n binding.path.remove()\n }\n}\n\nfunction hasExport(ast: t.File, node: t.Identifier): boolean {\n let found = false\n\n babel.traverse(ast, {\n ExportNamedDeclaration(path) {\n if (path.node.declaration) {\n // declared as `const loaderFn = () => {}`\n if (t.isVariableDeclaration(path.node.declaration)) {\n path.node.declaration.declarations.forEach((decl) => {\n if (t.isVariableDeclarator(decl)) {\n if (t.isIdentifier(decl.id)) {\n if (decl.id.name === node.name) {\n found = true\n }\n }\n }\n })\n }\n\n // declared as `function loaderFn() {}`\n if (t.isFunctionDeclaration(path.node.declaration)) {\n if (t.isIdentifier(path.node.declaration.id)) {\n if (path.node.declaration.id.name === 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