Function describeRules

describeRules<T>(
items: readonly T[],
describe: (item: T) => string,
): string | null
The rules covering one region, joined for a single listing row.
Type Parameters
- T
Parameters
- items: readonly T[]
- describe: (item: T) => string
Returns string | null

Remarks
Separated by | rather than the · a single rule uses for its own marks — overlapping rules are common (that is why a cell can carry several), and one separator for both levels made a two-rule row unreadable as either.