bc518174
 王天杨
提交两个项目文件
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import { isAfter, isBefore, isSameDay } from 'date-fns';
import { DateRange } from 'types/Matchers';
/**
* Add a day to an existing range.
*
* The returned range takes in account the `undefined` values and if the added
* day is already present in the range.
*/
export function addToRange(
day: Date,
range?: DateRange
): DateRange | undefined {
const { from, to } = range || {};
if (from && to) {
if (isSameDay(to, day) && isSameDay(from, day)) {
return undefined;
}
if (isSameDay(to, day)) {
return { from: to, to: undefined };
}
if (isSameDay(from, day)) {
return undefined;
}
if (isAfter(from, day)) {
return { from: day, to };
}
return { from, to: day };
}
if (to) {
if (isAfter(day, to)) {
return { from: to, to: day };
}
return { from: day, to };
}
if (from) {
if (isBefore(day, from)) {
return { from: day, to: from };
}
return { from, to: day };
}
return { from: day, to: undefined };
}
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