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Regression in v4.2.1-rc (EDIT: also an issue in v4.2.2), tsc fails to compile with an error Debug Failure. Unhandled Diagnostic: 2626. It worked fine in v4.2.0-beta
🔎 Search Terms
🕗 Version & Regression Information
This is a crash
This changed between versions v4.2.1-beta and v4.2.2-rc
This is the behaviour in every version I tried, and I reviewed the FAQ for entries about "Debug Failure. Unhandled Diagnostic: 2626"
I was unable to test this on prior versions because _______
$ yarn tsc --extendedDiagnostics
...\node_modules\typescript\lib\tsc.js:88040
throw e;
^
Error: Debug Failure. Unhandled Diagnostic: 2626
at reportIncompatibleStack (...\node_modules\typescript\lib\tsc.js:49104:45)
at checkTypeRelatedTo (...\node_modules\typescript\lib\tsc.js:48976:17)
at checkTypeRelatedToAndOptionallyElaborate (...\node_modules\typescript\lib\tsc.js:48255:24)
at checkTypeAssignableToAndOptionallyElaborate (...\node_modules\typescript\lib\tsc.js:48249:20)
at checkVariableLikeDeclaration (...\node_modules\typescript\lib\tsc.js:62811:25)
at checkVariableDeclaration (...\node_modules\typescript\lib\tsc.js:62876:13)
at checkSourceElementWorker (...\node_modules\typescript\lib\tsc.js:65151:28)
at checkSourceElement (...\node_modules\typescript\lib\tsc.js:64999:17)
at Object.forEach (...\node_modules\typescript\lib\tsc.js:128:30)
at checkVariableStatement (...\node_modules\typescript\lib\tsc.js:62886:16)
Bug Report
Regression in
v4.2.1-rc(EDIT: also an issue inv4.2.2), tsc fails to compile with an errorDebug Failure. Unhandled Diagnostic: 2626. It worked fine inv4.2.0-beta🔎 Search Terms
🕗 Version & Regression Information
v4.2.1-betaandv4.2.2-rcI was unable to test this on prior versions because _______⏯ Playground Link
Playground link with relevant code💻 Code
// I don't have a simple reproduction, this occurs in our ~60,000 SLOC codebase which is 50% Javascript using checkJs modetsconfig:
{ "compilerOptions": { "target": "es5", "lib": ["dom", "dom.iterable", "es2020"], "allowJs": true, "checkJs": true, "skipLibCheck": true, "esModuleInterop": true, "allowSyntheticDefaultImports": true, "strict": true, "forceConsistentCasingInFileNames": true, "module": "esnext", "moduleResolution": "node", "resolveJsonModule": true, "isolatedModules": true, "noEmit": true, "jsx": "react-jsx", "noFallthroughCasesInSwitch": true, "downlevelIteration": true, "importHelpers": true, "strictNullChecks": true, "noImplicitAny": false, "baseUrl": "src" }, "include": ["src"], "exclude": ["cypress", "src/**/__tests__/*.test.*"], "typeAcquisition": { "include": ["jest"], "exclude": ["chai", "cypress"] } }🙁 Actual behaviour
TSC crashes and fails to compile
🙂 Expected behaviour
It should compile, which worked in v4.2 beta