Upgrade to React 17, fix usage of contextTypes #2548
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Document the analysis of upgrading React from 16.9 to 17 or 18, including all breaking changes, affected files, and recommendations. Key findings: - ~140 usages of deprecated findDOMNode - 42 string ref usages across 13 files - 11 ReactDOM.render calls need createRoot migration - 5 files still using deprecated lifecycle methods - 3 files using legacy context API - Test infrastructure needs overhaul (enzyme-adapter-react-16) Recommendation: Upgrade to React 17 first (medium effort), then plan React 18 upgrade after addressing findDOMNode usage.
Comprehensive checklist with specific file paths and line numbers for all callsites that need to be addressed: Priority 1 - Deprecated Lifecycle Methods (4 files): - message-item-body.tsx:84 - componentWillMount - billing-modal.tsx:29 - componentWillMount - mailspring-calendar.tsx:98 - componentWillMount - metadata-composer-toggle-button.tsx:57 - componentWillMount Priority 2 - Legacy Context API (3 files): - tab-group-region.tsx:21,70 - parentTabGroup context - sheet-toolbar.tsx:225,237 - sheetDepth context - sheet.tsx:42,53 - sheetDepth context Priority 3 - Package Updates: - react, react-dom, react-test-renderer → ^17.0.2 - @types/react, @types/react-dom → ^17.0.0 - enzyme-adapter-react-16 → @wojtekmaj/enzyme-adapter-react-17 Includes migration patterns and verification checklist.
This commit implements the React 17 upgrade with the following changes: ## Deprecated Lifecycle Methods (4 files) - message-item-body.tsx: componentWillMount → componentDidMount - billing-modal.tsx: componentWillMount → componentDidMount - mailspring-calendar.tsx: componentWillMount → componentDidMount - metadata-composer-toggle-button.tsx: componentWillMount → componentDidMount ## Legacy Context API Migration (3 providers, 4 consumers) Created new React Context APIs to replace legacy childContextTypes: ### TabGroupContext (for focus management) - Provider: tab-group-region.tsx - Consumers: date-picker.tsx, time-picker.tsx, composer-header.tsx ### SheetDepthContext (for sheet depth tracking) - Providers: sheet.tsx, sheet-toolbar.tsx - Consumer: toolbar-category-picker.tsx ## Package Updates app/package.json: - react: 16.9.0 → ^17.0.2 - react-dom: 16.9.0 → ^17.0.2 - react-test-renderer: 16.9.0 → ^17.0.2 - enzyme-adapter-react-16 → @wojtekmaj/enzyme-adapter-react-17 package.json (root): - @types/react: ^16.8.5 → ^17.0.0 - @types/react-dom: ^16.8.2 → ^17.0.0 - @types/react-test-renderer: ^16.8.1 → ^17.0.0 - Removed @types/enzyme-adapter-react-16 ## New Files - app/src/components/tab-group-context.ts - app/src/sheet-context.ts ## Test Infrastructure - Updated spec-runner.ts to use @wojtekmaj/enzyme-adapter-react-17
The migration from componentWillMount to componentDidMount caused the component to render with accounts: undefined before the subscription fired. CalendarSourceList would then crash trying to call accounts.find() on undefined. Fixed by: - Initializing accounts: [] in constructor - Making accounts required in the state interface (was optional)
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Document the analysis of upgrading React from 16.9 to 17 or 18,
including all breaking changes, affected files, and recommendations.
Key findings:
Recommendation: Upgrade to React 17 first (medium effort),
then plan React 18 upgrade after addressing findDOMNode usage.