VSCode plugin: Script kind should match provided ScriptKind:1

[davidtaylorhq]

When using the VSCode Glint plugin on our codebase, it regularly breaks down with this error:

Glint encountered an error computing diagnostics for this file. This is likely a bug in Glint; please file an issue, including any code and/or steps to follow to reproduce the error.

Error: Debug Failure. False expression: Script kind should match provided ScriptKind:1 and sourceFile.scriptKind: 3, !entry: false
    at getDocumentRegistryEntry (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:142581:11)
    at Object.releaseDocumentWithKey (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:142675:19)
    at Object.getOrCreateSourceFileByPath [as getSourceFileByPath] (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:151555:30)
    at tryReuseStructureFromOldProgram (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:126294:59)
    at createProgram (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:125689:23)
    at synchronizeHostDataWorker (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:151491:15)
    at synchronizeHostData (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:151386:7)
    at Object.getProgram (/Users/david/discourse/discourse/node_modules/.pnpm/[email protected]/node_modules/typescript/lib/typescript.js:151568:5)
    at GlintLanguageServer.isAnalyzableFile (file:///Users/david/discourse/discourse/node_modules/.pnpm/@[email protected][email protected]/node_modules/@glint/core/lib/language-server/glint-language-server.js:493:36)
    at GlintLanguageServer.findDiagnosticsSource (file:///Users/david/discourse/discourse/node_modules/.pnpm/@[email protected][email protected]/node_modules/@glint/core/lib/language-server/glint-language-server.js:474:18)

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We're using the stable version of Glint (1.5.2), and the officially-released Glint plugin. Typescript version 5.7.3. Our codebase is entirely .js and .gjs files - no typescript. @builtin VSCode typescript extension is disabled.

Running VSCode's "restart extension host" can resolve the issue temporarily, but then it returns as soon as you change a single character in the file. If I fully restart VSCode, then it sometimes works for a bit longer before breaking down again. I haven't been able to find a specific sequence of actions which reproduces the problem on every machine.

Does anyone have any ideas about the cause? Or a way that I can collect more information about what's happening?