Add regression test for jsxImportSource in non-module files

[Mudassir Mohammed (pmudassir)]

Fixes #64438

The bug in #64438 is already fixed on main by microsoft/typescript-go#3803. This PR only adds a regression test, because #3803 didn't include one for this scenario.

Analysis

Up to TypeScript 6.0, the program only created the implicit <source>/jsx-runtime import for module files (isExternalModule(file) || isolatedModules). The checker, though, always tried to resolve it. So in a script file the checker asked for a resolution that had never been done, and reported TS2875 followed by TS7026, even with the runtime package installed. That's why adding export {} made the errors go away.

microsoft/typescript-go#3803 removed that module-only condition (tsc/internal/compiler/fileloader.go). The repro from the issue type-checks cleanly in 7.0.2 and still fails in 6.0.3. Since that change, a TS2875 in a script file means the runtime package really can't be found, the same as in a module.

Test

jsxImportSourceScriptFile.tsx puts the same JSX in a script file and in a module, with a stub @solidjs/web runtime in node_modules, and expects identical results for both. The <span /> line checks that the runtime's JSX.IntrinsicElements is actually used, rather than the types falling back to any. Against the commit before #3803, the script file reports TS7026 on every tag instead.

I ran npx hereby validate and npx hereby check:format.

#64445 is also open for this issue and changes the TS2875 wording. This PR only adds a test and doesn't overlap with it.

I used Claude Code (an AI coding agent) to investigate this and write the test. I've reviewed the change and will respond to review feedback myself.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The focused test and its baselines correctly cover the previously untested script-file behavior.

Review effort: Balanced
Findings: None

What changed in this PR

Adds regression coverage ensuring jsxImportSource resolves correctly in script and module files.

Changes:

• Adds a compiler test with a mock SolidJS JSX runtime.
• Verifies identical diagnostics, symbols, and inferred types.

File	Description
tsc/​testdata/​tests/​cases/​compiler/​jsxImportSourceScriptFile.tsx	Defines the regression scenario.
tsc/​testdata/​baselines/​reference/​compiler/​jsxImportSourceScriptFile.types	Records inferred types.
tsc/​testdata/​baselines/​reference/​compiler/​jsxImportSourceScriptFile.symbols	Records resolved symbols.
tsc/​testdata/​baselines/​reference/​compiler/​jsxImportSourceScriptFile.errors.txt	Records expected intrinsic-element errors.

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