Diagram Demos - Fix typeExpr implementation

[markallenramirez]

Cherry-pick from #31890

[Copilot]

Pull request overview

This pull request fixes the implementation of the typeExpr function in Diagram demos across all framework variants (jQuery, Vue, React, ReactJs, Angular). The fix ensures typeExpr properly implements the getter/setter pattern required by the DevExtreme Diagram API.

Key Changes:

• Converted typeExpr from a getter-only function to a proper getter/setter function that accepts two parameters (obj and value)
• When value === undefined, the function acts as a getter and returns the type value
• When value is provided, the function acts as a setter, assigns the value to obj.type, and returns null
• Applied consistently across 10 demo files covering two different demos in five framework variants

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
apps/demos/Demos/Diagram/CustomShapesWithTemplatesWithEditing/jQuery/index.js	Implemented getter/setter pattern for typeExpr in jQuery demo
apps/demos/Demos/Diagram/CustomShapesWithTemplatesWithEditing/Vue/App.vue	Implemented getter/setter pattern for typeExpr in Vue TypeScript demo
apps/demos/Demos/Diagram/CustomShapesWithTemplatesWithEditing/ReactJs/App.js	Implemented getter/setter pattern for typeExpr in React JavaScript demo
apps/demos/Demos/Diagram/CustomShapesWithTemplatesWithEditing/React/App.tsx	Implemented getter/setter pattern for typeExpr in React TypeScript demo
apps/demos/Demos/Diagram/CustomShapesWithTemplatesWithEditing/Angular/app/app.component.ts	Implemented getter/setter pattern for typeExpr in Angular demo
apps/demos/Demos/Diagram/CustomShapesWithTemplates/jQuery/index.js	Implemented getter/setter pattern for typeExpr in jQuery demo (returns dynamic employee ID-based type)
apps/demos/Demos/Diagram/CustomShapesWithTemplates/Vue/App.vue	Implemented getter/setter pattern for typeExpr in Vue TypeScript demo (returns dynamic employee ID-based type)
apps/demos/Demos/Diagram/CustomShapesWithTemplates/ReactJs/App.js	Implemented getter/setter pattern for typeExpr in React JavaScript demo (returns dynamic employee ID-based type)
apps/demos/Demos/Diagram/CustomShapesWithTemplates/React/App.tsx	Implemented getter/setter pattern for typeExpr in React TypeScript demo (returns dynamic employee ID-based type)
apps/demos/Demos/Diagram/CustomShapesWithTemplates/Angular/app/app.component.ts	Implemented getter/setter pattern for typeExpr in Angular demo (returns dynamic employee ID-based type)