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Assertion failure in method snippet completions for subclasses with multiple type parameter references #48379

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#48490
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Assertion failure in method snippet completions for subclasses with multiple type parameter references#48379
#48490
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jakebailey
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BugA bug in TypeScriptA bug in TypeScriptCrashFor flagging bugs which are compiler or service crashes or unclean exits, rather than bad outputFor flagging bugs which are compiler or service crashes or unclean exits, rather than bad outputDomain: LS: Completion ListsThe issue relates to showing completion lists in an editorThe issue relates to showing completion lists in an editorFix AvailableA PR has been opened for this issueA PR has been opened for this issue
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TypeScript 4.7.0
@DanielRosenwasser

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@DanielRosenwasser
DanielRosenwasser
opened on Mar 23, 2022
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Same stack trace as #45744

declare class Component<T> {
  setState(stateHandler: ((oldState: T, newState: T) => void)): void;
}

class SubComponent extends Component<{}> {
    /*$*/
}

Request snippet completions at /*$*/.

<semantic> Response received: completionInfo (1916). Request took 8 ms. Success: false . Message: Error processing request. Debug Failure. False expression.
Error: Debug Failure. False expression.
    at consumeTokenAndAdvanceScanner ([node_modules_dir]/typescript/lib/tsserver.js:145519:30)
    at processChildNodes ([node_modules_dir]/typescript/lib/tsserver.js:145489:33)
    at [node_modules_dir]/typescript/lib/tsserver.js:145384:21
    at visitNodes ([node_modules_dir]/typescript/lib/tsserver.js:30152:24)
    at Object.forEachChild ([node_modules_dir]/typescript/lib/tsserver.js:30323:24)
    at processNode ([node_modules_dir]/typescript/lib/tsserver.js:145381:20)
    at processChildNode ([node_modules_dir]/typescript/lib/tsserver.js:145449:21)
    at processChildNodes ([node_modules_dir]/typescript/lib/tsserver.js:145496:48)
    at [node_modules_dir]/typescript/lib/tsserver.js:145384:21
    at visitNodes ([node_modules_dir]/typescript/lib/tsserver.js:30152:24)
    at Object.forEachChild ([node_modules_dir]/typescript/lib/tsserver.js:30330:24)
    at processNode ([node_modules_dir]/typescript/lib/tsserver.js:145381:20)
    at processChildNode ([node_modules_dir]/typescript/lib/tsserver.js:145449:21)
    at [node_modules_dir]/typescript/lib/tsserver.js:145382:21
    at visitNode ([node_modules_dir]/typescript/lib/tsserver.js:30147:24)
    at Object.forEachChild ([node_modules_dir]/typescript/lib/tsserver.js:30242:21)
    at processNode ([node_modules_dir]/typescript/lib/tsserver.js:145381:20)
    at processChildNode ([node_modules_dir]/typescript/lib/tsserver.js:145449:21)
    at processChildNodes ([node_modules_dir]/typescript/lib/tsserver.js:145496:48)
    at [node_modules_dir]/typescript/lib/tsserver.js:145384:21
    at visitNodes ([node_modules_dir]/typescript/lib/tsserver.js:30152:24)
    at Object.forEachChild ([node_modules_dir]/typescript/lib/tsserver.js:30304:21)
    at processNode ([node_modules_dir]/typescript/lib/tsserver.js:145381:20)
    at formatSpanWorker ([node_modules_dir]/typescript/lib/tsserver.js:145182:17)
    at [node_modules_dir]/typescript/lib/tsserver.js:145146:140
    at Object.getFormattingScanner ([node_modules_dir]/typescript/lib/tsserver.js:143773:23)
    at Object.formatNodeGivenIndentation ([node_modules_dir]/typescript/lib/tsserver.js:145146:31)
    at [node_modules_dir]/typescript/lib/tsserver.js:131006:46
    at Object.flatMap ([node_modules_dir]/typescript/lib/tsserver.js:508:25)
    at getEntryForMemberCompletion ([node_modules_dir]/typescript/lib/tsserver.js:131004:38)
    at createCompletionEntry ([node_modules_dir]/typescript/lib/tsserver.js:130828:23)
    at getCompletionEntriesFromSymbols ([node_modules_dir]/typescript/lib/tsserver.js:131194:29)
    at completionInfoFromData ([node_modules_dir]/typescript/lib/tsserver.js:130646:17)
    at Object.getCompletionsAtPosition ([node_modules_dir]/typescript/lib/tsserver.js:130507:36)
    at Object.getCompletionsAtPosition ([node_modules_dir]/typescript/lib/tsserver.js:163069:35)
    at IpcIOSession.Session.getCompletions ([node_modules_dir]/typescript/lib/tsserver.js:174630:64)
    at Session.handlers.ts.Map.ts.getEntries._a.<computed> ([node_modules_dir]/typescript/lib/tsserver.js:173451:61)
    at [node_modules_dir]/typescript/lib/tsserver.js:175346:88
    at IpcIOSession.Session.executeWithRequestId ([node_modules_dir]/typescript/lib/tsserver.js:175337:28)
    at IpcIOSession.Session.executeCommand ([node_modules_dir]/typescript/lib/tsserver.js:175346:33)
    at IpcIOSession.Session.onMessage ([node_modules_dir]/typescript/lib/tsserver.js:175372:35)
    at process.<anonymous> ([node_modules_dir]/typescript/lib/tsserver.js:178007:31)
    at process.emit (events.js:315:20)
    at emit (internal/child_process.js:903:12)
    at processTicksAndRejections (internal/process/task_queues.js:81:21)

That's one minimal example. The more motivating example is completion for all React class components.

interface Component<P = {}, S = {}, SS = any> { }
declare class Component<P, S> {
  setState<K extends keyof S>(
    state: ((prevState: Readonly<S>, props: Readonly<P>) => (Pick<S, K> | S | null)) | (Pick<S, K> | S | null),
    callback?: () => void
  ): void;
}

export class Thing extends Component<{}> {
    /*$*/
}
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BugA bug in TypeScriptA bug in TypeScriptCrashFor flagging bugs which are compiler or service crashes or unclean exits, rather than bad outputFor flagging bugs which are compiler or service crashes or unclean exits, rather than bad outputDomain: LS: Completion ListsThe issue relates to showing completion lists in an editorThe issue relates to showing completion lists in an editorFix AvailableA PR has been opened for this issueA PR has been opened for this issue

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