# svelte/derived-has-same-inputs-outputs

derived store should use same variable names between values and callback

# 📖 Rule Details

This rule reports where variable names and callback function’s argument names are different. This is mainly a recommended rule to avoid implementation confusion.

/* eslint svelte/derived-has-same-inputs-outputs: "error" */

import { derived } from 'svelte/store';

/* ✓ GOOD */
derived(a, ($a) => {});
derived(a, ($a, set) => {});
derived([a, b], ([$a, $b]) => {});

/* ✗ BAD */
derived(a, (
The argument name should be '$a'. (svelte/derived-has-same-inputs-outputs)b) => {});
derived(a, (
The argument name should be '$a'. (svelte/derived-has-same-inputs-outputs)b, set) => {});
derived([a, b], ([
The argument name should be '$a'. (svelte/derived-has-same-inputs-outputs)one
The argument name should be '$b'. (svelte/derived-has-same-inputs-outputs), two]) => {});

# 🔧 Options

Nothing.

# 📚 Further Reading

• Svelte - Docs > RUN TIME > svelte/store > derived

# 🚀 Version

This rule was introduced in eslint-plugin-svelte v2.8.0

# 🔍 Implementation

• Rule source
• Test source