#116 · Programming Language Developer Tool

TypeScript Converter

Convert common TypeScript declarations and syntax forms, including interface-to-type, enum-to-object, readonly removal, array syntax, and lightweight TypeScript-to-JavaScript stripping.

Developer Input

Browser-based source processing

Source code or structured input

interface User {
  readonly id: number;
  name: string;
}

Mode

Output name

file

Preserve comments Keep type-only imports Add conversion notes Auto-run while typing

How to use this developer tool

Paste TypeScript.
Choose a conversion mode.
Set an output name if needed.
Run the conversion and review warnings before use.

What this developer tool does

The converter applies mode-specific transformations while protecting strings and comments and reporting syntax that cannot be converted safely without a compiler.

Mode selection → lexical protection → targeted transform → unsupported-syntax scan → formatted output and warnings.

TypeScript-to-JavaScript mode is a lightweight syntax stripper, not official compiler output.

Example

Input:

interface User {
  readonly id: number;
  name: string;
}

Expected use: Run the selected mode and review the generated output and statistics.

Tips for better output

Review enum and namespace conversions carefully.
Decorators and parameter properties may require a compiler.
JavaScript-to-TypeScript inference is not included in destructive modes.
Always test converted runtime code.

FAQ

How can I convert TypeScript to JavaScript online?

Choose TypeScript to JavaScript to remove common type-only syntax and review the warnings.

How do I convert a TypeScript interface to a type alias?

Choose Interface to type and paste a supported interface declaration.

How can I convert a TypeScript enum to a const object?

Choose Enum to const object to generate an as-const object and value union.

How do I remove readonly properties from TypeScript?

Choose Remove readonly to strip readonly modifiers while preserving property types.

How can I convert Type array syntax to Array generic syntax?

Choose T[] to Array to convert simple array annotations.

Related developer tools

TypeScript Checker TypeScript Generator TypeScript Formatter TypeScript Parser

Supported analysis and output

Module	Purpose
Input	Local browser processing
Analysis	Tool-specific lexical and structural logic
Output	Copy and download ready
Privacy	No upload or server execution

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