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8 changes: 7 additions & 1 deletion src/defu.ts
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,10 @@ function isObject(value: any) {
return value !== null && typeof value === "object";
}

function isDate(value: any) {
return Object.prototype.toString.call(value) === "[object Date]";
}

// Base function to apply defaults
function _defu<T>(
baseObject: T,
Expand All @@ -14,7 +18,9 @@ function _defu<T>(
if (!isObject(defaults)) {
return _defu(baseObject, {}, namespace, merger);
}

if (isDate(defaults)) {
return baseObject || defaults;
}
const object = Object.assign({}, defaults);

for (const key in baseObject) {
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6 changes: 6 additions & 0 deletions test/defu.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,12 @@ describe("defu", () => {
expectTypeOf(result).toEqualTypeOf<{ a: string; d: string }>();
});

it('should return date value by Object.assign', () => {
const defaultObj = { date: new Date('2021-01-01'), date2: new Date('2021-01-02') }
const obj2 = { date: new Date('2021-01-03') }
expect(defu(obj2, defaultObj)).toEqual({ date:obj2.date, date2:defaultObj.date2 })
})

it("should fill in values that are null", () => {
const result1 = defu({ a: null as null }, { a: "c", d: "c" });
expect(result1).toEqual({ a: "c", d: "c" });
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