Debug Failure. This is unknown parent for type parameter: 190 (/192)

[jeengbe]

Bug Report

🔎 Search Terms

Debug Failure.
This is unknown parent for type parameter: 190 (for 4.8.3)
This is unknown parent for type parameter: 192 (for 4.9.0-dev.20220924)
getTypeParameterConstraintVisibilityError
type constraints

🕗 Version & Regression Information

• This is a crash
• This changed between versions ______ and _______
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________
• I was unable to test this on prior versions because _______

Tested with 4.8.3 and 4.9.0-dev.20220924.

⏯ Playground Link

Unfortunately, I have not been able to compile a sample to reproduce the error, as I have not ventured deep enough into its cause.
However, I can reliably make it crash in my code where I originally found it:
https://github.com/jeengbe/vality/tree/dev/src/lib/parse.ts

💻 Code

1. Remove the following import:

diff --git a/src/lib/parse.ts b/src/lib/parse.ts
index 0dd2292..71937b9 100644
--- a/src/lib/parse.ts
+++ b/src/lib/parse.ts
@@ -1,4 +1,4 @@
-import { Eny, IntersectItems, OneOrEnumOfTOrFace } from "./utils";
+import { Eny, IntersectItems } from "./utils";
 import { Face } from "./validate";
 
 // Depending on the direction of the required type, we parse relations differently

And voilà, observe the following error in tsserver log:

Info 49   [20:51:04.256] event:
    {"seq":0,"type":"event","event":"syntaxDiag","body":{"file":"/home/coder/data/vality/src/lib/parse.ts","diagnostics":[]}}
Err 50    [20:51:04.476] Exception on executing command delayed processing of request 3:

    Debug Failure. This is unknown parent for type parameter: 190

    Error: Debug Failure. This is unknown parent for type parameter: 190
        at getTypeParameterConstraintVisibilityError (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:109359:37)
        at handleSymbolAccessibilityError (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:109532:33)
        at checkEntityNameVisibility (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:109985:13)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110174:25)
        at visitNode (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90384:23)
        at Object.visitEachChild (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90638:173)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110245:43)
        at visitNode (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90384:23)
        at Object.visitEachChild (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90725:58)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110276:31)
        at visitArrayWorker (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90473:48)
        at visitNodes (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90436:23)
        at Object.visitEachChild (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90707:58)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110276:31)
        at visitArrayWorker (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90473:48)
        at visitNodes (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90436:23)
        at Object.visitEachChild (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90689:116)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110175:39)
        at Object.visitNode (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90384:23)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110251:46)
        at Object.visitNode (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90384:23)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110256:44)
        at Object.visitNode (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90384:23)
        at visitDeclarationSubtree (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110256:44)
        at Object.visitNode (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90384:23)
        at transformTopLevelDeclaration (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110388:210)
        at visitDeclarationStatements (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110341:26)
        at visitArrayWorker (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90473:48)
        at Object.visitNodes (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:90436:23)
        at transformRoot (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:109704:37)
        at transformation (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:110993:24)
        at transformRoot (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:111020:82)
        at Object.transformNodes (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:111004:78)
        at Object.getDeclarationDiagnostics (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:109411:25)
        at /home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:119306:27
        at runWithCancellationToken (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:119003:24)
        at getDeclarationDiagnosticsForFileNoCache (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:119303:20)
        at getAndCacheDiagnostics (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:119317:26)
        at getDeclarationDiagnosticsWorker (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:119300:20)
        at getDeclarationDiagnosticsForFile (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:119327:56)
        at getDiagnosticsHelper (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:118945:24)
        at Object.getDeclarationDiagnostics (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:118987:24)
        at Object.getSemanticDiagnostics (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:167285:50)
        at IpcIOSession.Session.semanticCheck (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:178569:52)
        at /home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:178635:31
        at MultistepOperation.executeAction (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:177493:25)
        at /home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:177472:100
        at IpcIOSession.Session.executeWithRequestId (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:180157:28)
        at Object.executeWithRequestId (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:178333:87)
        at Immediate._onImmediate (/home/coder/data/vality/node_modules/.pnpm/typescript@4.8.3/node_modules/typescript/lib/tsserver.js:177472:41)
        at processImmediate (node:internal/timers:466:21)

For 4.9.0-dev.20220924 the id of the received node appears to be 192.

🙁 Actual behavior

error in log.

This causes tsserver to disregard semantic errors in that very file.

🙂 Expected behavior

no error in log.

[justinyaodu]

When I encountered a similar crash, I commented out "declaration": true from my tsconfig.json and tsc gave me type errors instead, similar to #25456. Once I fixed those type errors (I forgot to import some types), I uncommented "declaration": true and tsc compiled successfully again.

[JoshuaKGoldberg]

Edit: here's a much more trim reproduction:

type Test<T> = T extends infer A extends B ? number : string;

Here, too, declaration must be enabled in the TSConfig for the error.

---

Here's a trimmed down reproduction:

type AnyRouter = () => any;

type RouterToParams<T> = T;

export function mergeRouters<TRouters extends [...AnyRouter[]]>(
  ...routerList: TRouters
): RouterToParams<TRouters> extends infer AllParams extends AnyRouterParams[]
  ? string : never {
}

Note that AnyRouterParams does not exist in the snippet. There should be a TypeScript error about identifier/name not being found, not an uncaught error visible in browser dev tools console:

Uncaught (in promise) Error: Debug Failure. This is unknown parent for type parameter: 192

Originally spotted in the build for trpc/trpc#3502. That build has ts.SyntaxKind[190], InferType, hitting on AllParams extends AnyRouterParams[]. It's roughly the same syntax area.