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Code changes was requested by @arthrod.

• fix(pagination): margin-aware packing + continuous-overlay polish (dogfood fixes) #421 (comment)

The following files were modified:

• packages/pagination/src/layout/__tests__/compose.spec.ts
• packages/pagination/src/layout/compose.ts
• packages/pagination/src/layout/continuous.ts

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[arthrod]

P0 bug: cumulative used but never declared in getContinuousBreakYs

The JSDoc rewrite in continuous.ts accidentally deleted let cumulative = 0; while the variable is still referenced in the loop body. This is a TypeScript compile error and a runtime ReferenceError.

Broken state (current PR):

export function getContinuousBreakYs(layout: LayoutOutput): number[] {
  const breakYs: number[] = [];
  // ← let cumulative = 0; was deleted here

  for (let i = 0; i < layout.pages.length - 1; i++) {
    cumulative += pageHeight(layout.pages[i]);  // ← ReferenceError
    breakYs.push(cumulative);
  }

  return breakYs;
}

Fix: restore the declaration:

export function getContinuousBreakYs(layout: LayoutOutput): number[] {
  const breakYs: number[] = [];
  let cumulative = 0;

  for (let i = 0; i < layout.pages.length - 1; i++) {
    cumulative += pageHeight(layout.pages[i]);
    breakYs.push(cumulative);
  }

  return breakYs;
}

---

The other two changes are correct:

• ✅ compose.spec.ts — beforeEach(() => { nextId = 0; }) correctly fixes test-ordering dependency
• ✅ compose.ts — inline comment accurately describes heightPx vs lineCount semantics

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Generated by Claude Code

[arthrod]

Checked and selectively cherry-picked the useful parts.

File count:

• PR changes: 3 files
• Accepted into current branch: 3 files, with the broken line restored

Accepted:

• packages/pagination/src/layout/__tests__/compose.spec.ts: reset nextId in beforeEach so tests do not depend on run order.
• packages/pagination/src/layout/compose.ts: kept the flow-height comment.
• packages/pagination/src/layout/continuous.ts: kept the clearer JSDoc wording.

Rejected / corrected:

• The deletion of let cumulative = 0 is wrong. getContinuousBreakYs still increments cumulative; without the declaration this is a TypeScript error and runtime ReferenceError.

The review blocker was correct. I kept the documentation improvement but retained the variable.

Verification after the accepted hunks: pagination coverage tests, package build/typecheck, lint, and the pagination Playwright spec all pass.