prefer-set-over-unit-map

Prefer sets over maps whose values are unit

A map with unit values expresses only whether each key is present.
Instead, you SHOULD use Set<K> to represent membership directly.

- Category: style
- Level: warning
- Fix: suggestion
- Scope: module

Reported

const values = new Map<string, void>();
Accepted

const values = new Set<string>();
Prior art

- Clippy · zerosizedmapvalues

language/linter/src/rules/style/prefersetoverunitmap.rs:8