Cannot read property 'escapedName' of undefined

[mjbvz]

Bug Report

🔎 Search Terms

• jsdoc
• javascript

🕗 Version & Regression Information

4.5.0-dev.20211025

💻 Repro

1. Starting with the code:

/**
 * @typedef {{
 *  (a) => string
 * }} Callback2
 */
function foo() { }

2. After the a inside the typedef, type :x

Bug

 ERR <semantic> TypeScript Server Error (4.5.0-dev.20211025)
Cannot read property 'escapedName' of undefined
TypeError: Cannot read property 'escapedName' of undefined
    at getSignatureFromDeclaration (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:57785:48)
    at getThisTypeOfDeclaration (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:54849:43)
    at tryGetThisTypeAt (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:69726:32)
    at Object.tryGetThisTypeAt (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:47036:32)
    at getGlobalCompletions (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:129361:48)
    at tryGetGlobalSymbols (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:129277:25)
    at getCompletionData (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:129030:22)
    at Object.getCompletionsAtPosition (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:128020:34)
    at Proxy.getCompletionsAtPosition (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:159572:35)
    at IOSession.Session.getCompletions (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:171037:64)
    at Session.handlers.ts.Map.ts.getEntries._a.<computed> (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:169882:61)
    at /Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:171686:88
    at IOSession.Session.executeWithRequestId (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:171677:28)
    at IOSession.Session.executeCommand (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:171686:33)
    at IOSession.Session.onMessage (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:171712:35)
    at Interface.<anonymous> (/Users/matb/projects/san/node_modules/typescript/lib/tsserver.js:174317:31)
    at Interface.emit (events.js:315:20)
    at Interface._onLine (readline.js:337:10)
    at Interface._normalWrite (readline.js:482:12)
    at Socket.ondata (readline.js:194:10)
    at Socket.emit (events.js:315:20)
    at addChunk (internal/streams/readable.js:309:12)
    at readableAddChunk (internal/streams/readable.js:284:9)
    at Socket.Readable.push (internal/streams/readable.js:223:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:188:23): Error: <semantic> TypeScript Server Error (4.5.0-dev.20211025)

[sandersn]

I can't repro this in a fresh folder running a tsserver built from main or release-4.5. I also tried in a JS file with a tsconfig that includes it. Matt Bierner (@mjbvz) can you give more detail on your repro?

Here's what I tried

$ mkdir ts-bug
$ cd ts-bug
$ touch foo.js
$ code .

Paste in your example, then type :x after a. It completes to XMLDocument instead of crashing for me.

[mjbvz]

Yes I can't repo this anymore either. It was fixed in 4.5 after I filed this issue