microsoft / microsoft/TypeScript

typescript shows error about import with new URL

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Bug Domain: ES Modules
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Description

Bug Report

🔎 Search Terms

new URL, import, dynamic import

🕗 Version & Regression Information
  • This is a crash
  • TypeScript 4.1.5
⏯ Playground Link

Playground link with relevant code

💻 Code
const url = new URL('/file.js', import.meta.url)

import(url)

export {}
🙁 Actual behavior
  1. TypeScript shows an error: "Dynamic import's specifier must be of type 'string', but here has type 'URL'.ts(7036)"
  2. Intellisense and type checking stop working in VSCode
🙂 Expected behavior
  1. TypeScript shows no error
  2. Intellisense and type checking are working normally in VSCode

Stacktrace from VSCode tsserver log:

Err 139   [22:05:40.607] Exception on executing command delayed processing of request 25:

    Debug Failure. False expression: Containing file should be a module.

    Error: Debug Failure. False expression: Containing file should be a module.
        at checkImportMetaProperty (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:70401:22)
        at checkMetaProperty (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:70376:24)
        at checkExpressionWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72737:28)
        at checkExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72628:38)
        at checkNonNullExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:67648:37)
        at checkPropertyAccessExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:67693:85)
        at checkExpressionWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72708:28)
        at checkExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72628:38)
        at checkExpressionWithContextualType (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72275:28)
        at getSignatureApplicabilityError (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:68797:35)
        at chooseOverload (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:69306:25)
        at resolveCall (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:69180:26)
        at resolveNewExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:69649:24)
        at resolveSignature (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:69961:28)
        at getResolvedSignature (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:69990:26)
        at checkCallExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:70116:29)
        at checkExpressionWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72719:28)
        at checkExpression (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72628:38)
        at checkExpressionCached (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72304:38)
        at checkDeclarationInitializer (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:72317:148)
        at getTypeForVariableLikeDeclaration (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:50953:74)
        at getWidenedTypeForVariableLikeDeclaration (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:51355:56)
        at getTypeOfVariableOrParameterOrPropertyWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:51497:24)
        at getTypeOfVariableOrParameterOrProperty (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:51392:28)
        at getTypeOfSymbol (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:51735:24)
        at checkVariableLikeDeclaration (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:75078:41)
        at checkVariableDeclaration (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:75158:13)
        at checkSourceElementWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:77850:28)
        at checkSourceElement (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:77695:17)
        at Object.forEach (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:190:30)
        at checkVariableStatement (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:75169:16)
        at checkSourceElementWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:77819:28)
        at checkSourceElement (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:77695:17)
        at Object.forEach (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:190:30)
        at checkSourceFileWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:78040:20)
        at checkSourceFile (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:78007:13)
        at getDiagnosticsWorker (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:78096:17)
        at Object.getDiagnostics (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:78082:24)
        at /snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107275:85
        at runWithCancellationToken (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107237:24)
        at getBindAndCheckDiagnosticsForFileNoCache (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107263:20)
        at getAndCacheDiagnostics (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107539:26)
        at getBindAndCheckDiagnosticsForFile (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107260:20)
        at getSemanticDiagnosticsForFile (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107257:60)
        at getDiagnosticsHelper (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107179:24)
        at Object.getSemanticDiagnostics (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:107192:20)
        at Proxy.getSemanticDiagnostics (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:149195:47)
        at IOSession.Session.semanticCheck (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:159618:52)
        at /snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:159674:31
        at MultistepOperation.executeAction (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:158624:25)
        at /snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:158603:100
        at IOSession.Session.executeWithRequestId (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:160908:28)
        at Object.executeWithRequestId (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:159386:87)
        at Immediate._onImmediate (/snap/code-insiders/638/usr/share/code-insiders/resources/app/extensions/node_modules/typescript/lib/tsserver.js:158603:41)
        at processImmediate (internal/timers.js:456:21)

VSCode suggestions stop working:

no-intellisense

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked TypeScript Playground reproduction and trace the reported tsserver path through checkImportMetaProperty and checkMetaProperty. Verify the URL passed to dynamic import no longer produces the reported type error or tsserver assertion, and that VSCode IntelliSense and type checking continue working.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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