feat(checks): Add safety checks for MDX format

[gersona]

• fixes Checks for MDX format #19555
  This only handles the JSX expressions like {propos.name}, assuming the other inline codes are already handled by the Markdown check and/or Auto safe HTML checks

[gersona]

@nijel I'm not sure if default_disabled should be set to True as for MarkdownBaseCheck
I also assume this will be included in the 2026.7 release.

[argos-ci]

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	9 changed	Jun 4, 2026, 5:44 AM

[nijel]

I'm afraid this is too simple; you can have curly braces inside the expression:

<button onClick={() => {
  console.log("Clicked!");
  setCount(count + 1);
}}>
  Click Me
</button>

<div style={{ color: 'blue', fontSize: '14px' }}>Text</div>

<div>
  {users.map(({ id, name }) => (
    <p key={id}>{name}</p>
  ))}
</div>

PS: I've just quickly Googled for examples, these might be wrong, so first properly evaluate the JSX syntax.

[gersona]

You're right, I'll make changes to handle that.
From what I understand, it's a valid example JSX, but the MDX parser would skip the content inside markups.
But something like the following would be correctly parsed

Test {
    [1, 2, 3].map(
        ({ id }) => (<p key={id}>{id}</p>)
        )
}

[Copilot]

Pull request overview

Adds a new MDX-specific translation safety check intended to prevent JSX expression changes in .mdx strings, and wires it into the MDX format’s default check flags and documentation.

Changes:

• Introduces SafeMDXCheck and registers it in the default checks list.
• Enables the safe-mdx flag for MDX via format defaults and location-based flag inference.
• Updates tests and autogenerated documentation snippets to reflect the new check/flag.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
weblate/settings_example.py	Documents the new check in the example check list.
weblate/formats/tests/test_convert.py	Adds an assertion for MDX format default check flags.
weblate/formats/convert.py	Adds MDX safe-mdx to format-level check_flags (and a minor typing tweak).
weblate/formats/base.py	Adds safe-mdx to location-derived flags for .mdx paths.
weblate/checks/tests/test_flags.py	Updates expected location-derived flags for .mdx.
weblate/checks/test_mdx.py	Adds unit tests for the new MDX check.
weblate/checks/mdx.py	Implements the new SafeMDXCheck.
weblate/checks/defaults.py	Registers SafeMDXCheck in the default checks.
docs/snippets/format-features/mdx-features.rst	Updates MDX format feature snippet to include the new check.
docs/snippets/checks-autogenerated.rst	Adds autogenerated docs section for check-safe-mdx.
docs/snippets/check-flags-autogenerated.rst	Adds ignore-safe-mdx to the ignore-flags documentation.
docs/changes.rst	Adds a 2026.7 changelog entry describing the new check.

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