Exception in `quickInfo` with conditional types

[rbuckton]

TypeScript Version: 2.8.0-dev (master)

Code

interface Awaiters<T> {
 0: T extends PromiseLike<any> ? never : T;
 1: Awaiter<T, 0>;
 [depth: number]: Awaiters<T>[keyof Awaiters<T>];
}
type Awaiter<T, Depth extends number> = T extends PromiseLike<infer U> ? Awaiters<U>[Depth] : never;
type Awaited<T> = Awaiters<T>[keyof Awaiters<T>];

interface BadPromise {
 then(onfulfilled: (value: BadPromise ) => void): any;
}

type T1 = Awaited<BadPromise>;

Repro steps:

1. Open a new TS file in VS Code with the above source text.
2. Ensure the VS Code Output window is open with the TypeScript extension output active.
3. Hover over T1 above.

Expected behavior:

Quick Info reports type T1 = never;

Actual behavior:

Exception in quickInfo:

[Error - 3:19:57 PM] 'quickinfo' request failed with error.
Error processing request. Maximum call stack size exceeded
RangeError: Maximum call stack size exceeded
 at getSymbolLinks (c:\dev\TypeScript\built\local\tsserver.js:21829:32)
 at instantiateSymbol (c:\dev\TypeScript\built\local\tsserver.js:27969:25)
 at instantiateList (c:\dev\TypeScript\built\local\tsserver.js:27867:34)
 at instantiateSignature (c:\dev\TypeScript\built\local\tsserver.js:27963:165)
 at getBaseSignature (c:\dev\TypeScript\built\local\tsserver.js:26524:24)
 at inferFromSignatures (c:\dev\TypeScript\built\local\tsserver.js:30358:97)
 at inferFromObjectTypes (c:\dev\TypeScript\built\local\tsserver.js:30336:21)
 at inferFromTypes (c:\dev\TypeScript\built\local\tsserver.js:30278:29)
 at inferFromProperties (c:\dev\TypeScript\built\local\tsserver.js:30347:25)
 at inferFromObjectTypes (c:\dev\TypeScript\built\local\tsserver.js:30335:21)
 at inferFromTypes (c:\dev\TypeScript\built\local\tsserver.js:30278:29)
 at inferTypes (c:\dev\TypeScript\built\local\tsserver.js:30129:13)
 at getConditionalType (c:\dev\TypeScript\built\local\tsserver.js:27548:17)
 at instantiateConditionalType (c:\dev\TypeScript\built\local\tsserver.js:28086:20)
 at c:\dev\TypeScript\built\local\tsserver.js:28080:76
 at mapType (c:\dev\TypeScript\built\local\tsserver.js:30926:25)
 at getConditionalTypeInstantiation (c:\dev\TypeScript\built\local\tsserver.js:28080:28)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28124:28)
 at instantiateList (c:\dev\TypeScript\built\local\tsserver.js:27872:41)
 at instantiateTypes (c:\dev\TypeScript\built\local\tsserver.js:27881:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28109:36)
 at instantiateIndexInfo (c:\dev\TypeScript\built\local\tsserver.js:28137:44)
 at resolveObjectTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25386:35)
 at resolveTypeReferenceMembers (c:\dev\TypeScript\built\local\tsserver.js:25419:13)
 at resolveStructuredTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25762:25)
 at getPropertyOfType (c:\dev\TypeScript\built\local\tsserver.js:26085:32)
 at getPropertyTypeForIndexType (c:\dev\TypeScript\built\local\tsserver.js:27363:28)
 at getIndexedAccessType (c:\dev\TypeScript\built\local\tsserver.js:27503:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28121:28)
 at getConditionalType (c:\dev\TypeScript\built\local\tsserver.js:27558:24)
 at instantiateConditionalType (c:\dev\TypeScript\built\local\tsserver.js:28086:20)
 at c:\dev\TypeScript\built\local\tsserver.js:28080:76
 ...
 at mapType (c:\dev\TypeScript\built\local\tsserver.js:30926:25)
 at getConditionalTypeInstantiation (c:\dev\TypeScript\built\local\tsserver.js:28080:28)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28124:28)
 at instantiateList (c:\dev\TypeScript\built\local\tsserver.js:27872:41)
 at instantiateTypes (c:\dev\TypeScript\built\local\tsserver.js:27881:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28109:36)
 at instantiateIndexInfo (c:\dev\TypeScript\built\local\tsserver.js:28137:44)
 at resolveObjectTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25386:35)
 at resolveTypeReferenceMembers (c:\dev\TypeScript\built\local\tsserver.js:25419:13)
 at resolveStructuredTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25762:25)
 at getPropertyOfType (c:\dev\TypeScript\built\local\tsserver.js:26085:32)
 at getPropertyTypeForIndexType (c:\dev\TypeScript\built\local\tsserver.js:27363:28)
 at getIndexedAccessType (c:\dev\TypeScript\built\local\tsserver.js:27503:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28121:28)
 at getConditionalType (c:\dev\TypeScript\built\local\tsserver.js:27558:24)
 at instantiateConditionalType (c:\dev\TypeScript\built\local\tsserver.js:28086:20)
 at c:\dev\TypeScript\built\local\tsserver.js:28080:76

[rbuckton]

There is also a similar error reported in getApplicableRefactors:

[Error - 3:19:59 PM] 'getApplicableRefactors' request failed with error.
Error processing request. Maximum call stack size exceeded
RangeError: Maximum call stack size exceeded
 at resolveStructuredTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25758:46)
 at getSignaturesOfStructuredType (c:\dev\TypeScript\built\local\tsserver.js:26105:32)
 at getSignaturesOfType (c:\dev\TypeScript\built\local\tsserver.js:26111:20)
 at inferFromSignatures (c:\dev\TypeScript\built\local\tsserver.js:30352:40)
 at inferFromObjectTypes (c:\dev\TypeScript\built\local\tsserver.js:30336:21)
 at inferFromTypes (c:\dev\TypeScript\built\local\tsserver.js:30278:29)
 at inferFromProperties (c:\dev\TypeScript\built\local\tsserver.js:30347:25)
 at inferFromObjectTypes (c:\dev\TypeScript\built\local\tsserver.js:30335:21)
 at inferFromTypes (c:\dev\TypeScript\built\local\tsserver.js:30278:29)
 at inferTypes (c:\dev\TypeScript\built\local\tsserver.js:30129:13)
 at getConditionalType (c:\dev\TypeScript\built\local\tsserver.js:27548:17)
 at instantiateConditionalType (c:\dev\TypeScript\built\local\tsserver.js:28086:20)
 at getConditionalTypeInstantiation (c:\dev\TypeScript\built\local\tsserver.js:28083:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28124:28)
 at instantiateList (c:\dev\TypeScript\built\local\tsserver.js:27872:41)
 at instantiateTypes (c:\dev\TypeScript\built\local\tsserver.js:27881:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28109:36)
 at instantiateIndexInfo (c:\dev\TypeScript\built\local\tsserver.js:28137:44)
 at resolveObjectTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25386:35)
 at resolveTypeReferenceMembers (c:\dev\TypeScript\built\local\tsserver.js:25419:13)
 at resolveStructuredTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25762:25)
 at getPropertyOfType (c:\dev\TypeScript\built\local\tsserver.js:26085:32)
 at getPropertyTypeForIndexType (c:\dev\TypeScript\built\local\tsserver.js:27363:28)
 at getIndexedAccessType (c:\dev\TypeScript\built\local\tsserver.js:27503:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28121:28)
 at getConditionalType (c:\dev\TypeScript\built\local\tsserver.js:27558:24)
 at instantiateConditionalType (c:\dev\TypeScript\built\local\tsserver.js:28086:20)
 at getConditionalTypeInstantiation (c:\dev\TypeScript\built\local\tsserver.js:28083:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28124:28)
 at instantiateList (c:\dev\TypeScript\built\local\tsserver.js:27872:41)
 at instantiateTypes (c:\dev\TypeScript\built\local\tsserver.js:27881:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28109:36)
 at instantiateIndexInfo (c:\dev\TypeScript\built\local\tsserver.js:28137:44)
 at resolveObjectTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25386:35)
 at resolveTypeReferenceMembers (c:\dev\TypeScript\built\local\tsserver.js:25419:13)
 at resolveStructuredTypeMembers (c:\dev\TypeScript\built\local\tsserver.js:25762:25)
 at getPropertyOfType (c:\dev\TypeScript\built\local\tsserver.js:26085:32)
 at getPropertyTypeForIndexType (c:\dev\TypeScript\built\local\tsserver.js:27363:28)
 at getIndexedAccessType (c:\dev\TypeScript\built\local\tsserver.js:27503:20)
 at instantiateType (c:\dev\TypeScript\built\local\tsserver.js:28121:28)
 at getConditionalType (c:\dev\TypeScript\built\local\tsserver.js:27558:24)
 at instantiateConditionalType (c:\dev\TypeScript\built\local\tsserver.js:28086:20)
 at getConditionalTypeInstantiation (c:\dev\TypeScript\built\local\tsserver.js:28083:20)
 ...

[mhegazy]

@ahejlsberg can you please take a look.

[alitaheri]

I Also got an error which might be related, can't pin down what part of the code causes it:

D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:26345
 symbol = resolveName(location || name, name.escapedText, meaning, ignoreErrors ? undefined : message, name, /*isUse*/ true);
 ^
RangeError: Maximum call stack size exceeded
 at resolveEntityName (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:26345:26)
 at resolveTypeReferenceName (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:31076:20)
 at getTypeFromTypeReference (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:31199:30)
 at getTypeFromTypeNode (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:32286:28)
 at getIndexInfoOfSymbol (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:30900:59)
 at resolveAnonymousTypeMembers (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:29806:39)
 at resolveStructuredTypeMembers (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:30000:25)
 at getPropertiesOfObjectType (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:30018:24)
 at propertiesIdenticalTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33912:40)
 at propertiesRelatedTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33785:28)
 at structuredTypeRelatedTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33742:38)
 at recursiveTypeRelatedTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33555:64)
 at isIdenticalTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33290:28)
 at isRelatedTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33191:28)
 at checkTypeRelatedTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33090:26)
 at isTypeRelatedTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:33062:24)
 at isTypeIdenticalTo (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:32728:20)
 at fillMissingTypeArguments (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:30555:44)
 at getTypeAliasInstantiation (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:31029:117)
 at getTypeFromTypeAliasReference (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:31050:24)
 at getTypeReferenceTypeWorker (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:31118:24)
 at getTypeReferenceType (D:\projects\csd\sales\node_modules\typescript\lib\typescript.js:31083:24)

TS: 2.8.0-dev.20180206

[mhegazy]

I can not get the exception with latest from master with @rbuckton's sample. @alitaheri can you give typescript@next a try tomorrow, and let us know if you are still seeing this issue? if so a repro would be appreciated.

[KiaraGrouwstra]

@mhegazy looks like @weswigham also bumped into this at #21613.