Ready2Blob/.planning/phases/04-review-download-security/04-02-SUMMARY.md

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phase: 04-review-download-security plan: 02 subsystem: ui tags: [react, typescript, jszip, blob-download, clipboard, tailwind]

Dependency graph

requires:

• phase: 04-01 provides: Wave 0 test stubs for ReviewStep (RED baseline)
• phase: 02-generators provides: Generator functions used by OutputBlock consumers provides:
• src/utils/downloadFile.ts — pure Blob+anchor download utility
• src/utils/downloadZip.ts — JSZip archive builder with Blob download
• src/components/wizard/OutputBlock.tsx — reusable code block with copy and optional download buttons affects:
• 04-03 (ReviewStep will import all three artifacts)
• 04-04 (security gate applied via OutputBlock disabled prop)

Tech tracking

tech-stack: added: - jszip ^3.10.1 (runtime dependency — client-side ZIP generation) patterns: - Blob + URL.createObjectURL + anchor click for file download (no FileSaver dependency) - JSZip generateAsync({ type: 'blob' }) for ZIP bundle download - navigator.clipboard.writeText with useState feedback (2s "Copied!" label) - disabled prop gates both copy and download actions (SECU-01 pattern)

key-files: created: - src/utils/downloadFile.ts - src/utils/downloadZip.ts - src/components/wizard/OutputBlock.tsx modified: - package.json (jszip added to dependencies) - package-lock.json

key-decisions:

• "No src/utils/index.ts barrel — direct imports keep test mock paths predictable (../../utils/downloadFile)"
• "Do NOT install @types/jszip — JSZip 3.x ships its own TypeScript declarations (stale package 6 years old)"
• "OutputBlock renders Download button conditionally on filename prop presence — not hidden, rendered when applicable"
• "disabled prop passed as HTML disabled attribute to both Copy and Download buttons — visual opacity-40 communicates lock state"

patterns-established:

• "Pattern: Blob download helper — create Blob, createObjectURL, hidden anchor click, revokeObjectURL immediately after click"
• "Pattern: OutputBlock disabled gate — parent passes disabled={!acknowledged} to apply SECU-01 per-block"

requirements-completed: [DOWN-01, DOWN-02, DOWN-03, DOWN-04, DOWN-05, DOWN-06, CONF-03]

Metrics

duration: 2min completed: 2026-03-27

Phase 4 Plan 02: Download Utilities and OutputBlock Summary

Blob/anchor download utility, JSZip ZIP builder, and reusable OutputBlock component with clipboard copy and per-block disabled security gate

Performance

• Duration: 2 min
• Started: 2026-03-27T10:43:40Z
• Completed: 2026-03-27T10:45:30Z
• Tasks: 2
• Files modified: 5

Accomplishments

• Created downloadFile utility using native Blob + createObjectURL + anchor pattern (no FileSaver dependency)
• Created downloadZip utility using JSZip generateAsync — installed jszip as the only new runtime dependency in phase 4
• Created OutputBlock reusable component with copy button (clipboard.writeText with 2s feedback), optional download button, and SECU-01 disabled gate via prop

Task Commits

Each task was committed atomically:

1. Task 1: Create downloadFile.ts and downloadZip.ts utilities - f948b86 (feat)
2. Task 2: Create OutputBlock.tsx reusable component - e223e8b (feat)

Plan metadata: (docs commit — see below)

Files Created/Modified

• src/utils/downloadFile.ts — Pure browser download: Blob + createObjectURL + anchor click + revokeObjectURL
• src/utils/downloadZip.ts — JSZip ZIP builder: loops file entries, generateAsync blob, same anchor download pattern
• src/components/wizard/OutputBlock.tsx — Labelled code block with copy button (clipboard + 2s feedback), optional download button, disabled prop gate
• package.json — jszip ^3.10.1 added to dependencies
• package-lock.json — lock file updated

Decisions Made

• No barrel file src/utils/index.ts — direct imports from specific utility files keep test mock paths predictable (the Wave 0 test file mocks ../../utils/downloadFile and ../../utils/downloadZip by exact path)
• @types/jszip intentionally omitted — JSZip 3.x ships its own TypeScript declarations; @types/jszip is 6 years stale and causes type conflicts
• OutputBlock Download button rendered conditionally on filename prop presence — if no filename, no download button; both Copy and Download always visible when applicable (never hidden while disabled)
• disabled:opacity-40 Tailwind class communicates lock state visually without hiding buttons

Deviations from Plan

None — plan executed exactly as written. Utility implementations match the specification in the plan verbatim. Build pre-existing TypeScript errors (in test files and vite.config.ts) were confirmed pre-existing and out of scope.

Issues Encountered

npm run build surfaces pre-existing TypeScript errors in *.test.ts files (vitest globals not typed in tsconfig) and vite.config.ts (test property). These are known pre-existing issues unrelated to this plan's changes. TypeScript compilation of the new source files is clean (verified via tsc --noEmit --skipLibCheck).

User Setup Required

None — no external service configuration required.

Next Phase Readiness

• downloadFile, downloadZip, and OutputBlock are ready for ReviewStep to compose in plan 04-03
• ReviewStep.test.tsx remains RED (ReviewStep file does not exist yet — expected at this stage)
• All 11 other test files remain GREEN (88 tests passing)

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Phase: 04-review-download-security Completed: 2026-03-27