fix(vitest-angular): normalize snapshot whitespace

[benpsnyder]

PR Checklist

Closes #2220

Affected scope

• Primary scope: vitest-angular
• Secondary scopes:

Recommended merge strategy for maintainer [optional]

• Squash merge
• Rebase merge
• Other

Commit preservation note [optional]

What is the new behavior?

Fixture snapshots now normalize serializer output to remove trailing whitespace at the end of lines and collapse repeated blank lines.

This keeps inline snapshots stable when formatters strip trailing spaces, and it removes extra empty rows left behind after serializer cleanup removes Angular comment noise.

The change stays inside the Angular fixture snapshot serializer and adds focused regression coverage for the whitespace normalization behavior.

Test plan

• nx format:check
• pnpm build
• pnpm test
• Manual verification

Commands run:

• pnpm exec vitest run --config packages/vitest-angular/vite.config.ts packages/vitest-angular/src/lib/snapshot-serializers/angular-fixture.spec.ts
• pnpm nx build vitest-angular

Does this PR introduce a breaking change?

• Yes
• No

Other information

This is intentionally conservative normalization: it only trims trailing spaces and collapses runs of empty lines in the final printed snapshot output.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: a3af6b13-7d4f-4cc9-85c9-4de85568a737

📥 Commits

Reviewing files that changed from the base of the PR and between b904975 and d7fb4d0.

⛔ Files ignored due to path filters (1)

• tests/vitest-angular/src/snapshot-serializers/__snapshots__/angular-fixture-snapshot.spec.ts.snap is excluded by !**/*.snap and included by tests/**

📒 Files selected for processing (1)

• packages/vitest-angular/src/lib/snapshot-serializers/angular-fixture.spec.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/vitest-angular/src/lib/snapshot-serializers/angular-fixture.spec.ts

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📝 Walkthrough

Walkthrough

Added a normalizeSnapshotOutput helper that trims trailing spaces/tabs on each line and collapses runs of three or more consecutive newlines into two. The Angular fixture snapshot serializer now applies this normalization to its serialized output. Two new tests were added to validate normalization behavior for trailing whitespace, repeated blank lines, and mixed whitespace within serialized component fixture outputs. No public API or exported declarations were changed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	PR title follows Conventional Commit style with supported scope (vitest-angular) and clearly summarizes the main change (whitespace normalization in snapshots).
Description check	✅ Passed	PR description directly relates to the changeset, explains the problem (trailing whitespace and empty rows in snapshots) and solution (normalization in serializer output).
Linked Issues check	✅ Passed	Changes fully address #2220 objectives: trailing whitespace is trimmed via normalizeSnapshotOutput(), empty rows are collapsed, and fix is implemented at serializer level with regression test coverage.
Out of Scope Changes check	✅ Passed	All changes are scoped to vitest-angular snapshot serializer normalization and related test coverage; no unrelated modifications detected.

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[benpsnyder]

@brandonroberts ready

[brandonroberts]

Beta branch

[brandonroberts]

LGTM