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Conditional Types Over Overloads

Checked
marius-townhouse·vlatest·backend

This skill intelligently handles complex function overloads and type constraints by applying conditional types, streamlining code and improving type safety.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add marius-townhouse/effective-typescript-skills --skill conditional-types-over-overloads -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

marius-townhouse

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned marius-townhouse/effective-typescript-skills at d754db2077.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
d754db2077
Manifest
skills/conditional-types-over-overloads/SKILL.md
Scanned
1 file, 197 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill enables AI agents to leverage conditional types in TypeScript to create more precise and type-safe code, effectively replacing or augmenting traditional overload signatures. It allows for deriving return types based on the input argument types, leading to improved type inference and reduced boilerplate. The agent can use this to generate complex type definitions and ensure that function implementations align with their declared types.

When to use it

  • Refactoring TypeScript code: To modernize older codebases by replacing overloaded functions with conditional type-based solutions for better type safety.
  • Generating complex type definitions: When you need a return type that depends on the specific input arguments provided to a function.
  • Improving type inference in libraries: When building reusable components, this skill can help ensure correct types are inferred automatically.
  • Debugging type errors: To understand and resolve complex type-related issues by analyzing conditional type expressions.

Key capabilities

  • Conditional Type Derivation: Generates return types based on input argument types.
  • Overload Replacement: Provides an alternative to traditional function overloads.
  • Type Safety Enhancement: Improves the overall type safety of TypeScript code.
  • Code Generation: Creates complex type definitions and function signatures.

Example prompts

  • "Generate a TypeScript function signature that returns 'string' if the input is a number, and 'number' otherwise."
  • “Convert this overloaded function to use conditional types.” [followed by the original function definition]
  • “Show me how to define a type that represents the union of two different types based on a boolean condition.”

Tips & gotchas

This skill requires a good understanding of TypeScript’s type system, particularly conditional types and their syntax. Complex conditional types can be difficult to read and debug, so start with simpler examples before tackling larger refactorings.