no-array-fill-with-reference-type

Disallow Array.fill values that share mutable references

Array.fill places the same managed reference in every selected element, so later mutation is shared by all of them.
Instead, you SHOULD construct each mutable value independently with Array.from or an explicit loop.

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

Reported

class Cell {
    value: int32 = 0;
}

function cells(): Cell[] {
    const values = [new Cell(), new Cell(), new Cell()];
    values.fill(new Cell());
    return values;
}
Accepted

class Cell {
    value: int32 = 0;
}

function cells(): Cell[] {
    return [new Cell(), new Cell(), new Cell()];
}
Prior art

- eslint-plugin-unicorn · no-array-fill-with-reference-type

language/linter/src/rules/suspicious/noarrayfillwithreferencetype.rs:6