Temporal.Duration.prototype.valueOf()

None.

None.

TypeError

Always thrown.

Because both primitive conversion and number conversion call valueOf() before toString(), if valueOf() is absent, then an expression like duration1 > duration2 would implicitly compare them as strings, which may have unexpected results such as "PT3S" > "PT1M". By throwing a TypeError, Temporal.Duration instances prevent such implicit conversions. You need to explicitly convert them to numbers using Temporal.Duration.prototype.total(), or use the Temporal.Duration.compare() static method to compare them.

All arithmetic and comparison operations on Temporal.Duration instances should use the dedicated methods or convert them to primitives explicitly.

const duration1 = Temporal.Duration.from({ seconds: 3 });
const duration2 = Temporal.Duration.from({ minutes: 1 });
duration1 > duration2; // TypeError: can't convert Duration to primitive type
duration1.total("seconds") > duration2.total("seconds"); // false
Temporal.Duration.compare(duration1, duration2); // -1

duration1 + duration2; // TypeError: can't convert Duration to primitive type
duration1.total("seconds") + duration2.total("seconds"); // 63
duration1.add(duration2).toString(); // "PT1M3S"

• Temporal.Duration
• Temporal.Duration.prototype.toString()
• Temporal.Duration.prototype.toJSON()
• Temporal.Duration.prototype.toLocaleString()