Cannot find symbol for node "manual" in "manual.fetch" from "app/node_modules/@anthropic-ai/sdk/_shims/index.d.ts"

[xlc]

Bug report

Input code

import type { Anthropic } from '@anthropic-ai/sdk'

export const test = (): Anthropic | undefined => {
  return undefined
}

Expected output

don't throw error

Actual output

354 | }
355 | exports.getRootSourceFile = getRootSourceFile;
356 | function getNodeOwnSymbol(node, typeChecker) {
357 |     const nodeSymbol = typeChecker.getSymbolAtLocation(node);
358 |     if (nodeSymbol === undefined) {
359 |         throw new Error(`Cannot find symbol for node "${node.getText()}" in "${node.parent.getText()}" from "${node.getSourceFile().fileName}"`);
                    ^
error: Cannot find symbol for node "manual" in "manual.fetch" from "app/node_modules/@anthropic-ai/sdk/_shims/index.d.ts"
      at getNodeOwnSymbol (app/node_modules/dts-bundle-generator/dist/helpers/typescript.js:359:15)
      at getSymbol (app/node_modules/dts-bundle-generator/dist/types-usage-evaluator.js:240:42)
      at <anonymous> (app/node_modules/dts-bundle-generator/dist/types-usage-evaluator.js:209:37)
      at visitNode2 (app/node_modules/typescript/lib/typescript.js:32134:18)
      at forEachChildInQualifiedName (app/node_modules/typescript/lib/typescript.js:32172:12)
      at forEachChild (app/node_modules/typescript/lib/typescript.js:32655:35)
      at computeUsagesRecursively (app/node_modules/dts-bundle-generator/dist/types-usage-evaluator.js:194:12)
      at <anonymous> (app/node_modules/dts-bundle-generator/dist/types-usage-evaluator.js:198:18)
      at visitNode2 (app/node_modules/typescript/lib/typescript.js:32134:18)
      at forEachChildInTypeQuery (app/node_modules/typescript/lib/typescript.js:32246:12)

Additional context

This is the code causing issue https://github.com/anthropics/anthropic-sdk-typescript/blob/5dba177ba04a01c9d0d8c903e0b808bfe9c68961/src/_shims/index.d.ts#L15-L16