Demos: Fix TS problems and make TS improvements in demos in strict mode (Editors)

[pharret31]

No description provided.

[Copilot]

Pull request overview

This PR enables TypeScript strict mode checking for editor-related React demos by removing exclusions from tsconfig.react-check.json and fixing TypeScript issues. The changes focus on improving type safety across demos for components like Autocomplete, Calendar, Chat, NumberBox, SelectBox, Slider, TextArea, Toast, Validation, and others.

• Removes 44 demo exclusions from TypeScript checking configuration
• Adds proper null/undefined handling with optional chaining and nullish coalescing
• Improves type annotations and imports using type keyword for type-only imports
• Refactors code to eliminate redundant intermediate variables

Reviewed changes

Copilot reviewed 62 out of 62 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tsconfig.react-check.json	Removes exclusions for editor demos now passing strict TypeScript checks
Validation/Overview (React & ReactJs)	Adds optional chaining for validator ref access
Toast/Stack (React & ReactJs)	Changes null to undefined for NumberBox default values
TextArea/Overview (React & ReactJs)	Changes maxLength state from null to undefined
TagBox/* (React & ReactJs)	Adds null safety checks and improves type annotations
Stepper/FormIntegration (React & ReactJs)	Adds null coalescing for date array access
SpeechToText/Overview (React & ReactJs)	Derives languages array from langMap object, adds Language type
Slider/Overview (React)	Adds type annotation to format function
SelectBox/* (React)	Adds proper TypeScript interfaces for components and type-only imports
RangeSlider/Overview (React & ReactJs)	Extracts min/max constants, adds null coalescing for value handling
RadioGroup/Overview (React)	Adds type annotation to renderCustomItem function
Popup/Overview (React & ReactJs)	Adds optional chaining for employee property access
NumberBox/Overview (React & ReactJs)	Adds optional chaining for event.key access
Map/Markers (React & ReactJs)	Changes marker URL state from null to undefined
HtmlEditor/* (React & ReactJs)	Removes redundant variables, adds null coalescing, improves type imports
FileUploader/FileUploading (React & ReactJs)	Adds early return guard for null value
DropDownButton/Overview (React & ReactJs)	Adds null handling for color values and querySelector results
DropDownBox/MultipleSelection (React)	Adds explicit type annotation in forEach callback
Common/PopupAndNotificationsOverview (React & ReactJs)	Adds null check guard clause for updatedCurrentHouse
Common/EditorsRightToLeftSupport (React & ReactJs)	Changes className from null to undefined
Chat/* (React & ReactJs)	Adds extensive null safety, type improvements, and proper type casting
Calendar/* (React & ReactJs)	Changes cellComponent and disabledDates from null to undefined
Autocomplete/Overview (React & ReactJs)	Refactors loadOptions iteration with proper typing