Closed
Description
Bug Report
🔎 Search Terms
namespace enum compiler crash computeEnumMemberValues TypeError undefined length
🕗 Version & Regression Information
- This is the behavior in every version I tried
⏯ Playground Link
Playground link with relevant code
💻 Code
namespace x { export let y = 123 }
enum x { z = y }🙁 Actual behavior
$ tsc example.ts
./node_modules/typescript/lib/tsc.js:94427
throw e;
^
TypeError: Cannot read properties of undefined (reading 'length')
at computeEnumMemberValues (./node_modules/typescript/lib/tsc.js:68888:61)
at getEnumMemberValue (./node_modules/typescript/lib/tsc.js:70894:13)
at evaluateEnumMember (./node_modules/typescript/lib/tsc.js:69025:36)
at evaluate (./node_modules/typescript/lib/tsc.js:68998:61)
at computeConstantValue (./node_modules/typescript/lib/tsc.js:68922:86)
at computeMemberValue (./node_modules/typescript/lib/tsc.js:68907:24)
at computeEnumMemberValues (./node_modules/typescript/lib/tsc.js:68890:33)
at checkEnumDeclaration (./node_modules/typescript/lib/tsc.js:69051:13)
at checkSourceElementWorker (./node_modules/typescript/lib/tsc.js:69825:28)
at checkSourceElement (./node_modules/typescript/lib/tsc.js:69657:17)
at Object.forEach (./node_modules/typescript/lib/tsc.js:132:30)
at checkSourceFileWorker (./node_modules/typescript/lib/tsc.js:69985:20)
at checkSourceFile (./node_modules/typescript/lib/tsc.js:69953:13)
at getDiagnosticsWorker (./node_modules/typescript/lib/tsc.js:70039:17)
at Object.getDiagnostics (./node_modules/typescript/lib/tsc.js:70028:24)
at ./node_modules/typescript/lib/tsc.js:94448:85
at runWithCancellationToken (./node_modules/typescript/lib/tsc.js:94420:24)
at getBindAndCheckDiagnosticsForFileNoCache (./node_modules/typescript/lib/tsc.js:94437:20)
at getAndCacheDiagnostics (./node_modules/typescript/lib/tsc.js:94685:26)
at getBindAndCheckDiagnosticsForFile (./node_modules/typescript/lib/tsc.js:94434:20)
at getSemanticDiagnosticsForFile (./node_modules/typescript/lib/tsc.js:94431:61)
at ./node_modules/typescript/lib/tsc.js:94371:24
at Object.flatMap (./node_modules/typescript/lib/tsc.js:428:25)
at getDiagnosticsHelper (./node_modules/typescript/lib/tsc.js:94367:56)
at Object.getSemanticDiagnostics (./node_modules/typescript/lib/tsc.js:94378:20)
at emitFilesAndReportErrors (./node_modules/typescript/lib/tsc.js:99038:57)
at Object.emitFilesAndReportErrorsAndGetExitStatus (./node_modules/typescript/lib/tsc.js:99067:18)
at performCompilation (./node_modules/typescript/lib/tsc.js:101947:29)
at executeCommandLineWorker (./node_modules/typescript/lib/tsc.js:101849:17)
at Object.executeCommandLine (./node_modules/typescript/lib/tsc.js:101876:20)
at Object.<anonymous> (./node_modules/typescript/lib/tsc.js:102170:4)
at Module._compile (node:internal/modules/cjs/loader:1101:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object.<anonymous> (./node_modules/typescript/bin/tsc:2:1)
at Module._compile (node:internal/modules/cjs/loader:1101:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
at node:internal/main/run_main_module:17:47
🙂 Expected behavior
I expected tsc to either generate code or report an error diagnostic, but not to hard-crash like this.
For context, I'm trying to reverse-engineer what the semantics of enum/namespace interactions are to help improve esbuild's enum/namespace support. Specifically I'm investigating the feasibility of solving evanw/esbuild#1410. I hit this crash as part of that investigation and I figured it'd be useful to report it.