symbolToName does handle exports of namespaces

**TypeScript Version:** 3.2.2 **Search Terms:** symbolToName, exports, declaration, `.d.ts` TypeScript cannot emit the name for a symbol that's declared in an inner namespace but re-exported in the outer namespace. That is, emitting the type name of a symbol does not take an alias created by an `export {x as y}` statement into account. This comes up when trying to use the `chrome.debugger` declaration file. Because `debugger` is a reserved keyword, the `.d.ts` is defined using a fake, unexported inner namespace called `_debugger`, and re-exports it using `export {_debugger as debugger};`. TypeScript then cannot produce `.d.ts` files when trying to generate the name for a symbol. **Code** ```ts // decl.d.ts declare module chrome { namespace _debugger { export class Foo {} } export function getFoo(): debugger.Foo; export {_debugger as debugger}; } // user.ts export const x = chrome.getFoo(); ``` Run `tsc --declaration`. **Expected behavior:** ``` // user.d.ts export declare const x: chrome.debugger.Foo; ``` **Actual behavior:** ``` test.ts:1:14 - error TS4025: Exported variable 'x' has or is using private name '_debugger.Foo'. 1 export const x = chrome.getFoo(); ~ ``` **Playground Link:** n/a **Related Issues:** <!-- Did you find other bugs that looked similar? -->