fix: stop leaking the internal "~api" export into .d.marko output

[DylanPiercey]

The standalone "~api" export added to the extracted script in e986bcb was being copied into generated .d.marko files, which came out as static declare const __marko_internal_api = "class"; plus the export itself. The .d.marko printer now skips it and the const backing it — matching the generated export's local name and rejecting re-exports, so a source export { something as "~api" } is left alone. The api is re-derived whenever the .d.marko is extracted, so nothing is lost.

Also fixes isVariableStatementForName comparing escapedText, which TypeScript prefixes with an extra underscore for __-prefixed identifiers.

Adds the coverage that was missing: @marko/type-check now snapshots every emitted .d.marko for a fixture project and type checks the emitted files as Marko sources, so leaked internals fail the build.

[changeset-bot]

🦋 Changeset detected

Latest commit: 21e4375

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@marko/language-server	Patch
@marko/language-tools	Patch
@marko/ts-plugin	Patch
@marko/type-check	Patch
marko-vscode	Patch

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[coderabbitai]

Walkthrough

The change centralizes generated runtime API identifiers and filters the internal API variable and "~api" export from generated .d.marko declarations. It adds a patch changeset for this behavior. The type-check package gains Mocha commands, configuration, declaration-emission tests, Marko fixtures, and a declaration-only TypeScript configuration.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main fix to prevent the internal "~api" export from leaking into .d.marko output.
Description check	✅ Passed	The description directly explains the output fix, identifier matching correction, and added test coverage.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dpiercey-ws-marko-mtc-issue-pl7ym4

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@agent-feedback/dx.md`:
- Around line 4-15: Record the actionable declaration-emit test-coverage finding
from agent-feedback/dx.md in agent-feedback/README.md. Preserve the requested
scope and details, including the mtc fixture/snapshot validation, optional
re-check of emitted files, and verification of whether the recursive test
command covers packages/type-check.

In `@packages/language-tools/src/processors/marko.ts`:
- Around line 175-176: Update the filters around isInternalApiVar and
isExportInternalApi to match only generated internal API declarations: require
the exported property name to equal INTERNAL_API_VAR and ensure moduleSpecifier
is absent, excluding source exports and re-exports such as userApi. Apply
equally specific checks to isInternalApiVar so user-authored declarations are
preserved.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 247ad7ea-eb69-401b-b63c-b422de40faed

📥 Commits

Reviewing files that changed from the base of the PR and between 0c2ea1d and ed25f44.

📒 Files selected for processing (4)

• .changeset/dts-api-export.md
• agent-feedback/dx.md
• packages/language-tools/src/extractors/script/index.ts
• packages/language-tools/src/processors/marko.ts

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/type-check/package.json`:
- Around line 30-31: Update the package.json test and test:update scripts to run
the repository’s dependency-aware build command before invoking Mocha, ensuring
`@marko/language-tools` is built before type-check. Preserve the existing test
glob and update flag after the build step.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 92986839-9e21-4f41-9076-cf261d8e6c7f

📥 Commits

Reviewing files that changed from the base of the PR and between ed25f44 and ed11dab.

⛔ Files ignored due to path filters (3)

• packages/type-check/src/__tests__/fixtures/emit/__snapshots__/emits-declaration-files.expected/counter.d.marko is excluded by !**/__snapshots__/** and included by **
• packages/type-check/src/__tests__/fixtures/emit/__snapshots__/emits-declaration-files.expected/greet.d.marko is excluded by !**/__snapshots__/** and included by **
• packages/type-check/src/__tests__/fixtures/emit/__snapshots__/emits-declaration-files.expected/static.d.marko is excluded by !**/__snapshots__/** and included by **

📒 Files selected for processing (7)

• packages/type-check/.mocharc.json
• packages/type-check/package.json
• packages/type-check/src/__tests__/emit.test.ts
• packages/type-check/src/__tests__/fixtures/emit/src/counter.marko
• packages/type-check/src/__tests__/fixtures/emit/src/greet.marko
• packages/type-check/src/__tests__/fixtures/emit/src/static.marko
• packages/type-check/src/__tests__/fixtures/emit/tsconfig.json