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Understand Type Widening

Checked
marius-townhouse·vlatest·backend

Automatically adjusts data types during calculations to prevent errors and optimize performance in numerical workflows.

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 understand-type-widening -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.

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  • Pinned to a commit: passed

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

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Commit
d754db2077
Manifest
skills/understand-type-widening/SKILL.md
Scanned
1 file, 267 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 allows an AI agent to understand and explain type widening in TypeScript. It can identify situations where the compiler implicitly converts a narrower type to a wider one, such as converting number to bigint. The skill provides explanations of why this happens and how to control or avoid unintended type widening.

When to use it

  • Debugging Type Errors: When encountering unexpected behavior due to implicit type conversions in TypeScript code.
  • Code Review: To help understand the implications of assignments involving different numeric types.
  • Learning TypeScript: For developers new to TypeScript who want a deeper understanding of its type system.
  • Explaining Code to Others: To clearly articulate why certain type conversions are occurring in a codebase.

Key capabilities

  • Identifies instances of automatic type widening.
  • Explains the reasons behind type widening behavior.
  • Suggests ways to prevent or control unwanted type widening.

Example prompts

  • "Explain why this TypeScript code is assigning a number to a bigint variable."
  • "What are the potential issues with implicit type widening in TypeScript?"
  • "How can I ensure that my TypeScript functions maintain precise numeric types?"

Tips & gotchas

This skill requires some familiarity with TypeScript's basic type system. Be specific about the code snippet you want analyzed to get more targeted explanations.