no-duplicate-code

Disallow repeated nontrivial code regions

Multiple nontrivial callables or statement sequences perform the same operations.
Instead, you SHOULD extract the repeated statements into one callable.

- Category: suspicious
- Level: warning
- Fix: none
- Scope: program

Reported

function incrementLeft(value: int32): int32 {
    const next = value + 1;
    return next * 2;
}

function incrementRight(input: int32): int32 {
    const result = input + 1;
    return result * 2;
}
Accepted

function increment(value: int32): int32 {
    const next = value + 1;
    return next * 2;
}
Prior art

- eslint-plugin-sonarjs · no-identical-functions

language/linter/src/rules/suspicious/noduplicatecode.rs:14