Unused import

Severity: Info ID: unused-import

Flags imported symbols (or whole import statements) whose imported names are not referenced anywhere in the source unit.

What it does

Reports import "...", import "..." as X, and import { A, B } from "..." statements where one or more imported names are never used. Symbols brought in via import * as X are tracked through X.member accesses.

Why is this bad?

Unused imports add noise, slow down compilation, can cause name collisions, and frequently indicate dead code or stale refactors.

Example

Bad

solidity

import { A, B } from "./Lib.sol"; // B is never used

contract C {
    A internal a;
}

Good

solidity

import { A } from "./Lib.sol";

contract C {
    A internal a;
}