Inheritance

TypeSharp resolves class hierarchies and maps them to TypeScript extends. Base classes are emitted as separate interface files and referenced by name.

Example

UserDto.cs — typesharp

UserDto.cs●

baseEntity.ts

userDto.ts

[TypeSharp]
public class BaseEntity
{
    public int Id { get; set; }
    public DateTime CreatedAt { get; set; }
}

[TypeSharp]
public class UserDto : BaseEntity
{
    public string Name { get; set; }
    public string? Email { get; set; }
}

/**
 * Auto-generated by TypeSharp
 * Do not edit this file manually
 */

export interface BaseEntity {
    id: number;
    createdAt: string;
}

import type { BaseEntity } from './baseEntity';

/**
 * Auto-generated by TypeSharp
 * Do not edit this file manually
 */

export interface UserDto extends BaseEntity {
    name: string;
    email: string | null;
}

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Multi-level inheritance

Full inheritance chains are resolved — each level gets its own interface file.

models.cs — typesharp

models.cs●

output.ts

[TypeSharp]
public class Entity
{
    public int Id { get; set; }
}

[TypeSharp]
public class AuditableEntity : Entity
{
    public DateTime CreatedAt { get; set; }
    public DateTime UpdatedAt { get; set; }
}

[TypeSharp]
public class UserDto : AuditableEntity
{
    public string Name { get; set; }
    public string Email { get; set; }
}

export interface Entity {
    id: number;
}

export interface AuditableEntity extends Entity {
    createdAt: string;
    updatedAt: string;
}

export interface UserDto extends AuditableEntity {
    name: string;
    email: string;
}

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C# interface filtering

Any base type matching the C# interface convention (I + uppercase letter) is automatically stripped from the inheritance chain.

PaymentResult.cs — typesharp

PaymentResult.cs●

paymentResult.ts

[TypeSharp]
public class PaymentResult : BaseResult, IActionResult, IDisposable
{
    public bool Paid { get; set; }
}

// IActionResult and IDisposable are automatically filtered out

export interface PaymentResult extends BaseResult {
    paid: boolean;
}

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Notes

Multi-level inheritance chains are fully resolved.
Abstract base classes are emitted as regular interfaces.
C# interface implementations (IEntity, IDisposable) are automatically filtered — only class inheritance is mapped.

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