SonarCloud: cognitive complexity (S3776)

4 open SonarCloud finding(s) in petry-projects/google-app-scripts, worst severity CRITICAL. Generated by the org SonarCloud Audit.

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Findings

Rule	Count	Representative message
javascript:S3776	4	Refactor this function to reduce its Cognitive Complexity from 19 to the 15 allowed.

Affected files

src/gmail-to-drive-by-labels/src/index.js (2)
deploy/index.html (1)
src/calendar-to-sheets/src/index.js (1)

Priority

Labeled priority:critical — mapped from this bucket's worst SonarCloud severity (CRITICAL).

Acceptance

All findings in this workstream resolved to zero in SonarCloud
No behavior change; CI green
Real fixes (no blanket NOSONAR unless a confirmed false positive, noted inline)

Idempotent issue — updated automatically each audit run; auto-closed when the finding count reaches zero.

Dev-Lead Implementation Plan

Issue: #427 — SonarCloud: cognitive complexity (S3776)

Scope

Behavior-preserving refactors to reduce cognitive complexity below the 15 threshold for the 4 flagged functions, verified by the existing test suite (no behavior change).

Findings (from SonarCloud API)

File:line	Function	Complexity
`src/calendar-to-sheets/src/index.js:109`	`syncCalendarToSheet`	25
`src/gmail-to-drive-by-labels/src/index.js:125`	`processMessageToDoc` attachment loop	33
`src/gmail-to-drive-by-labels/src/index.js:690`	`rebuildDoc`	17
`deploy/index.html:1846`	`handleDeploy`	19

Implementation Checklist

src/calendar-to-sheets/src/index.js: extract upsertRows, insertNewRows, computeRowsToDelete helpers out of syncCalendarToSheet
src/gmail-to-drive-by-labels/src/index.js: extract attachment dedup/rename helpers out of the processMessageToDoc attachment loop
src/gmail-to-drive-by-labels/src/index.js: extract state-machine phase helpers out of rebuildDoc
deploy/index.html: extract resolveDeployProjectId + buildDeployErrorHtml helpers out of handleDeploy

Tests to Write

Behavior-preserving refactor: no new behavior, so no new tests required (Phase 2 exception). The existing 301 Jest tests + Playwright deploy/tests/ui.spec.js validate behavior preservation. Any newly extracted helper stays covered via its existing callers to maintain the 99% line / 85% branch coverage thresholds.

Test Command

npm test (Jest, includes coverage thresholds via npm test -- --coverage)

Dev-Lead: Implementation Complete

Behavior-preserving refactors that reduce cognitive complexity (S3776) below the 15 threshold for all 4 flagged functions. No behavior change — validated by the existing test suite (Phase 2 TDD exception applies to a pure refactor).

Plan Execution

src/calendar-to-sheets/src/index.js — syncCalendarToSheet (25→~5): extracted upsertRows, insertNewRows, shouldDeleteRow, computeRowsToDelete
src/gmail-to-drive-by-labels/src/index.js — processMessageToDoc attachment loop (33→~5): extracted isDuplicateAttachment, resolveAttachmentFileName
src/gmail-to-drive-by-labels/src/index.js — rebuildDoc (17→~5): extracted clearDocPhase, moveEmailsPhase (null-sentinel preserves original early-return/fall-through control flow)
deploy/index.html — handleDeploy (19→~8): extracted resolveDeployProjectId, buildDeployErrorHtml

Verification

npm test — 301/301 passing
npm test -- --coverage — exit 0, global thresholds met (branches 90.22 ≥ 85, functions 98.14 ≥ 95, lines 99.37 ≥ 99, statements 98.93 ≥ 95); extracted helpers at 100% function coverage
npm run check (prettier --check + eslint) — exit 0 (only pre-existing unused-var warnings in untouched test files)
bash .dev-lead/scripts/dev-lead-lint.sh — all checks passed
npx prettier --write . applied
node --check on both refactored index.js files — OK

Test Results

Test Suites: 12 passed, 12 total
Tests:       301 passed, 301 total
Snapshots:   0 total

----------------------------------|---------|----------|---------|---------|
File                              | % Stmts | % Branch | % Funcs | % Lines |
----------------------------------|---------|----------|---------|---------|
All files                         |   98.93 |    90.22 |   98.14 |   99.37 |
 src/calendar-to-sheets/src       |     100 |      100 |     100 |     100 |
  index.js                        |     100 |      100 |     100 |     100 |
 src/deploy                       |     100 |      100 |     100 |     100 |
 src/gmail-to-drive-by-labels/src |   98.53 |    90.56 |     100 |   99.09 |
  index.js                        |   98.53 |    90.56 |     100 |   99.09 |
----------------------------------|---------|----------|---------|---------|

Files Changed

src/calendar-to-sheets/src/index.js: split syncCalendarToSheet into upsert/insert/delete helpers
src/gmail-to-drive-by-labels/src/index.js: split the attachment loop and rebuildDoc state machine into helpers
deploy/index.html: split handleDeploy into project-resolution and error-html helpers

Notes

Pure refactor: no NOSONAR suppressions used. All original console.log/console.error calls and produced values/HTML are preserved verbatim, so runtime behavior is unchanged.
deploy/index.html is not part of Jest coverage (covered by the Playwright deploy/tests/ui.spec.js e2e); its inline JS was validated via prettier parse + syntax review. Extracted functions live in the same <script> scope and are hoisted.
The similar attachment loop in processLabelGroup was not flagged by SonarCloud and was left untouched to avoid scope creep.

SonarCloud Audit (2026-07-14): still open — 4 finding(s), worst severity CRITICAL.

SonarCloud Audit (2026-07-21): still open — 4 finding(s), worst severity CRITICAL.

Dev-Lead Implementation Plan

Issue: #427 — SonarCloud: cognitive complexity (S3776)

Scope

Refactor the 4 functions flagged by SonarCloud rule javascript:S3776 to reduce cognitive complexity below the 15 threshold, with no behavior change.

Findings located (verified locally with `eslint-plugin-sonarjs`)

File	Function	Complexity
`src/gmail-to-drive-by-labels/src/index.js`	attachment `forEach` loop in `processMessageToDoc`	33
`src/gmail-to-drive-by-labels/src/index.js`	`rebuildDoc`	17
`src/calendar-to-sheets/src/index.js`	`syncCalendarToSheet`	25
`deploy/index.html`	`handleDeploy`	19

Implementation Checklist

src/calendar-to-sheets/src/index.js — extract upsert loop (applyUpserts) and delete loop (collectRowsToDelete) out of syncCalendarToSheet
src/gmail-to-drive-by-labels/src/index.js — extract attachment dedup/save into a helper (processAttachment + findDuplicateFile) used by processMessageToDoc
src/gmail-to-drive-by-labels/src/index.js — extract phase bodies of rebuildDoc (clearDocumentPhase, moveEmailsPhase)
deploy/index.html — extract per-script deploy body (deployOneScript) and error-html builder (buildDeployErrorHtml) out of handleDeploy

Tests to Write

These are behavior-preserving refactors. The affected JS is already covered by the Jest suite (301 tests) and deploy/index.html by the Playwright e2e suite; both act as the regression net. No new behavior is introduced, so per the Phase 2 exception no new failing tests are added. Coverage thresholds (99% lines) will be kept green since extracted helpers sit on already-exercised paths.

Test Command

npm test (Jest + coverage); npm run test:e2e (Playwright, for deploy/index.html); complexity re-verified with eslint-plugin-sonarjs.

Dev-Lead: Implementation Complete

Refactored the 4 functions flagged by SonarCloud javascript:S3776 (cognitive complexity) so each drops below the 15 threshold, with no behavior change.

Plan Execution

src/calendar-to-sheets/src/index.js — extracted applyUpdatesAndCollectInserts (upsert loop) and collectRowsToDelete (delete loop) out of syncCalendarToSheet (25 → 0 findings)
src/gmail-to-drive-by-labels/src/index.js — extracted isDuplicateAttachment, resolveAttachmentName, processAttachment out of the processMessageToDoc attachment loop (33 → 0 findings)
src/gmail-to-drive-by-labels/src/index.js — extracted clearDocumentPhase and moveEmailsPhase out of rebuildDoc (17 → 0 findings)
deploy/index.html — extracted deployOneScript (per-script deploy body) and buildDeployErrorHtml (error status builder) out of handleDeploy (19 → 0 findings)

Verification

Cognitive complexity (re-measured with eslint-plugin-sonarjs, S3776, threshold 15): all four files now report 0 findings.
Jest: 12 suites, 301 tests passed (unchanged from baseline).
Coverage thresholds met: lines 99.37% (≥99), statements 98.92% (≥95), functions 98.13% (≥95), branches 90.19% (≥85). calendar-to-sheets/src/index.js is 100% across the board.
Playwright e2e (deploy/tests/ui.spec.js, covers handleDeploy): 65 passed.
Lint: npm run check → 0 errors (only pre-existing unused-var warnings in test files). .dev-lead/scripts/dev-lead-lint.sh → all checks passed.
npx prettier --write applied.

Test Results

Test Suites: 12 passed, 12 total
Tests:       301 passed, 301 total
Snapshots:   0 total

deploy/tests/ui.spec.js: 65 passed (22.0s)

Cognitive complexity (eslint-plugin-sonarjs, threshold 15):
  src/gmail-to-drive-by-labels/src/index.js: OK (0 findings)
  src/calendar-to-sheets/src/index.js: OK (0 findings)
  deploy/index.html: OK (0 findings)

Files Changed

src/calendar-to-sheets/src/index.js: extracted upsert/delete loops from syncCalendarToSheet into helpers.
src/gmail-to-drive-by-labels/src/index.js: extracted attachment dedup/save helpers from processMessageToDoc; extracted rebuildDoc phase bodies into helpers.
deploy/index.html: extracted per-script deploy and error-HTML builder from handleDeploy.

Notes

Pure behavior-preserving refactors: no observable behavior changes. All existing Jest and Playwright tests act as the regression net and remain green — so per the Phase 2 exception, no new tests were added. Log messages and control flow were preserved exactly.
Removed the now-unused Session binding from processMessageToDoc (it moved into resolveAttachmentName) to keep lint clean.
Complexity was located and verified locally with eslint-plugin-sonarjs (same S3776 rule as SonarCloud); the 4 findings map 1:1 to the issue's file counts.

SonarCloud Audit (2026-07-28): still open — 4 finding(s), worst severity CRITICAL.

Resolved! No open SonarCloud findings remain in this workstream as of 2026-08-04. Closing automatically.

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SonarCloud: cognitive complexity (S3776) #427