Function extentHasValue

src/util/model.ts:1284–1288

(extent: number[])

 * `extent` may contain `Infinity` / `NaN`, but assume no `null`/`undefined`.
 */
export function extentHasValue(extent: number[]): boolean {
    // Also considered extent may have `NaN` and `Infinity`.
    const span = extent[1] - extent[0];
    return isFinite(span) && span >= 0;
}

/**
 * NOTE: considered items are null/undefined/NaN - do nothing for this case.