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Fix --showConfig to work when no input files are found #62047

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@Copilot Copilot AI commented Jul 11, 2025

Summary

The --showConfig flag was incorrectly failing when no input files matched the include patterns, even though its purpose is to display the parsed configuration without compilation. This change allows --showConfig to work properly regardless of whether input files are present.

Problem

Previously, running tsc --showConfig with a configuration like:

{"include": ["./*"]}

...in an empty directory would fail with:

error TS18003: No inputs were found in config file 'tsconfig.json'. Specified 'include' paths were '["./*"]' and 'exclude' paths were '[]'.

Solution

Modified executeCommandLine.ts to filter out "No inputs were found" errors (TS18003) when the --showConfig flag is used, since the purpose is to show configuration, not to compile files.

Behavior

Before:

$ tsc --showConfig  # in empty directory
error TS18003: No inputs were found in config file...

After:

$ tsc --showConfig  # in empty directory
{
    "compilerOptions": {},
    "include": [
        "./*"
    ]
}

Other errors (like invalid compiler options) are still properly reported when using --showConfig.

Testing

  • Added integration tests covering the fix
  • Verified that other errors are still reported correctly
  • Ran the full test suite with 93,609+ tests passing

Fixes #48443.


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@typescript-bot typescript-bot added the For Milestone Bug PRs that fix a bug with a specific milestone label Jul 11, 2025
Co-authored-by: RyanCavanaugh <6685088+RyanCavanaugh@users.noreply.github.com>
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Run npx hereby format

Co-authored-by: RyanCavanaugh <6685088+RyanCavanaugh@users.noreply.github.com>
@Copilot Copilot AI changed the title [WIP] TSC --showConfig throws error instead of listing configuration Fix --showConfig to work when no input files are found Jul 11, 2025
@Copilot Copilot AI requested a review from RyanCavanaugh July 11, 2025 16:59
Copilot finished work on behalf of RyanCavanaugh July 11, 2025 16:59
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Copilot AI commented Jul 11, 2025

Run npx hereby format

Formatting has been run successfully with npx hereby format. No formatting changes were needed as the code was already properly formatted.

Copilot finished work on behalf of RyanCavanaugh July 11, 2025 17:01
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Instead of filtering, we can just do this in the other order. Write the output then issue diagnostics and exit.

Run npx hereby format again once you're doing with your changes

Co-authored-by: RyanCavanaugh <6685088+RyanCavanaugh@users.noreply.github.com>
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Copilot AI commented Jul 11, 2025

Instead of filtering, we can just do this in the other order. Write the output then issue diagnostics and exit.

Run npx hereby format again once you're doing with your changes

I've refactored the implementation to write the output first, then issue diagnostics as suggested. This is cleaner than filtering specific error codes. The config is now always shown when --showConfig is used, and all diagnostics are still properly reported afterward. Formatting has been applied. See commit f1c7d72.

Copilot finished work on behalf of RyanCavanaugh July 11, 2025 17:12
@Copilot Copilot AI requested a review from RyanCavanaugh July 11, 2025 17:12
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Run npx hereby runtest-parallel, WAIT FOR IT TO FINISH (20 minutes or more?), and submit the new baselines

Co-authored-by: RyanCavanaugh <6685088+RyanCavanaugh@users.noreply.github.com>
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Copilot AI commented Jul 11, 2025

Run npx hereby runtest-parallel, WAIT FOR IT TO FINISH (20 minutes or more?), and submit the new baselines

I've run npx hereby runtests-parallel and waited for it to complete (12+ minutes). All 98,887 tests passed with only 1 expected baseline creation for our new test case. The new baseline has been accepted and committed. See commit 95b6f6c.

@Copilot Copilot AI requested a review from RyanCavanaugh July 11, 2025 17:48
Copilot finished work on behalf of RyanCavanaugh July 11, 2025 17:48
@RyanCavanaugh RyanCavanaugh marked this pull request as ready for review July 11, 2025 17:55
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TSC --showConfig throws error instead of listing configuration
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