Mask TypeScript code in the browser
Select classes/types, functions/methods, identifiers, values, and comments to create a shareable copy. Input code and results are not sent to or stored on Develop Tools servers.
Open TypeScript Code Masking ToolConclusion
Create a sharing copy instead of using the original project, and mask type names, function names, variable names, strings, numbers, and comments. Preserve the TypeScript version, tsconfig, and error message, then compare satisfies, import paths, standard APIs, JSX, decorators, and directives with the original code before sharing.
Do not edit the original Project directly; work on a shareable Copy.
Check before and after before sharing
type CustomerResponse = {
customerId: string;
customerName?: string;
};
export async function fetchCustomer(id: string): Promise<CustomerResponse> {
const response = await fetch(`https://internal.example.local/customers/${id}`, {
headers: { Authorization: `Bearer ${process.env.INTERNAL_API_TOKEN}` }
});
return response.json() as Promise<CustomerResponse>;
}fetch, Authorization, process.env, and URLs in template literals may also be replaced. Do not execute the After result as-is; check that the structure needed for sharing remains.
Procedure for checking with the TypeScript code masking tool
- 1. Extract only the types and functions needed for reproduction into a separate copy.
- 2. Record the TypeScript, runtime, framework versions, and error in separate notes.
- 3. Select types, functions, identifiers, values, and comments, then mask them.
- 4. Compare standard APIs, directives, and TSX, then share only the result.
Checklist to prevent oversights
| Category | Account to check |
|---|---|
| Type | interface, type, Generic, Union |
| Runtime | API URLs, tokens, storage keys, and environment variables |
| Module | Import Path, Package, Path Alias |
| Framework | JSX, Hook, Directive, Decorator |
Separate TypeScript static types from JavaScript runtime behavior
| layer | What to check | What types alone cannot guarantee |
|---|---|---|
| TypeScript Compiler | Type annotations, unions, generics, narrowing, and TSConfig | Actual data contents received from an API or storage |
| JavaScript Runtime | Values and exceptions available in browsers and Node.js | Interfaces and type aliases normally do not remain in JavaScript output |
| external input | API JSON, forms, local storage, and environment variables | Type assertions alone do not validate or convert values |
| Framework | React Props, Next.js Server / Client boundaries, and Directives | Runtime constraints exist separately from TypeScript type checking |
"Added types in TypeScript" and "validated runtime data" are different. Narrow external input from unknown or validate it with a schema validator or similar tool.
Visually check TypeScript-specific structure after masking
- Compare mappings for interface, type, class, enum, generic parameters, constraints, unions, and optional properties
- Check the symbols and positions of satisfies, as const, type assertions, Conditional Types, infer, and Mapped Types.
- If needed, individually restore standard and runtime APIs and property names such as fetch, localStorage, and process.env
- Compare import type, import paths, path aliases, and module boundaries in .mts / .cts with the original code
- Focus on TSX Tags and Attributes, React Hooks, and Next.js use client / use server
- Handle decorator names, arguments, metadata, environment variable references, and template literal types carefully as copies intended for sharing
Even when restoring only the required structure, right-click the result and confirm again that the unmasked string does not contain secret information.
Separate non-code information and share it safely
| information | How to check |
|---|---|
| TypeScript / TSX | Replace type names, function names, identifiers, values, and comments with the TypeScript code masking tool |
| React-specific code | Also refer to the React code masking guide and check JSX, Hooks, and Props. |
| API JSON | Check keys, values, and array structures with the JSON masking tool |
| Stack Trace / Build Log | Check paths, packages, IDs, tokens, and messages with the log masking tool |
| tsconfig / .env | Extract only the required options and keys into a separate copy and replace paths, aliases, and values with dummy values. |
If Tokens, Cookies, Authorization Headers, Source Maps, internal Package names, or Private Registry URLs have leaked, consider revocation and reissuance in addition to masking.
Check the supported scope of the current TypeScript code masking tool
| Item | Support in the current Tool | Precautions before sharing |
|---|---|---|
| Input | Paste TypeScript / TSX text | Direct loading of .ts, .tsx, tsconfig.json, or an entire project is not supported. |
| Category | Classes / types, functions / methods, identifiers, values, comments | This is not semantic analysis equivalent to the TypeScript Compiler, AST Parser, or ESLint |
| Type syntax | Generally preserve the outer structure of interface, type, enum, generic, union, optional, and similar constructs | satisfies and Template Literal Types may be replaced, breaking syntax. |
| Standard API | May be replaced as a general identifier | fetch, useMemo, localStorage, process.env, and property names are not necessarily preserved |
| TSX / Framework | Process as TypeScript | Does not fully parse JSX tags / attributes, use client / use server, or decorator metadata |
| Import | Generally preserve the outer structure of import / export syntax | Import paths, package names, path aliases, and import type references may be replaced |
| Actions | Copy results, clear all, and individually unmask or reapply masking by right-clicking results | Before sending, recheck whether restored original information is needed for sharing |
| Save | Save only display settings in LocalStorage. | Inputs, results, mappings, and history are not sent to or stored on the Develop Tools server. |
Masking results are copies for sharing. They do not guarantee code that succeeds with tsc, builds, or runtime execution, or complete anonymization.
Compare the Version with official documentation
- TypeScript Handbook: Narrowing
- TypeScript Handbook: Generics
- TypeScript TSConfig Reference
- TypeScript 4.9: satisfies Operator
- TypeScript 5.0: Decorators
- Node.js: Modules
- React: Using TypeScript
- Next.js: TypeScript
TypeScript, Node.js, React, and Next.js behavior varies by Version and Module settings. Record the TypeScript Version, relevant tsconfig Options, Runtime, Framework Version, and File type (.ts, .tsx, .mts, or .cts), then compare against official documentation and Test results for the target Version.
Example: Consult AI about a tsc type error
Create a sharing copy instead of using the original project, and mask type names, function names, variable names, strings, numbers, and comments. Preserve the TypeScript version, tsconfig, and error message, then compare satisfies, import paths, standard APIs, JSX, decorators, and directives with the original code before sharing.
Use example.test or dummy values instead of real tokens, real customer information, or internal paths, and verify only the minimum scope needed to reproduce the issue.
- Extract minimal reproducible code into a shareable copy
- Mask types, identifiers, values, and comments
- Compare TypeScript syntax and Runtime Context
- Share only the masking results
You can individually unmask or reapply masking to result items by right-clicking. Before sending, recheck whether the restored original information is truly necessary.
Frequently asked questions
- Can I directly load .ts/.tsx files or projects?
- Direct loading is not supported. Paste the required TypeScript/TSX text into the input field. tsconfig and Package Project analysis are also not performed.
- Will masked code pass tsc or Build?
- Not guaranteed. satisfies, Import Paths, standard APIs, JSX Tags/Attributes, Decorators, Directives, and Template Literal Types may change, so compare it with the original code as a sharing Copy.
- Is the entered TypeScript code sent to a server?
- Input and masking results are processed in the browser and are not sent to or stored on the Develop Tools server. Only display settings are saved to LocalStorage.