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hourCycle option not recognized for Date.toLocaleString #34399
Description
TypeScript fails to recognize the hourCycle parameter for toLocaleString, documented on MDN.
TypeScript Version: 3.7.0-dev.20191014
Search Terms: toLocaleString, hourCycle
Code: TS2345
const a = (new Date()).toLocaleString('en-US', {hourCycle: 'h24'});
console.log(a);Expected behavior:
Compiles without error
Actual behavior:
test.ts:1:51 - error TS2345: Argument of type '{ hourCycle: string; }' is not assignable to parameter of type 'DateTimeFormatOptions'.
Object literal may only specify known properties, and 'hourCycle' does not exist in type 'DateTimeFormatOptions'.
1 const a = (new Date()).toLocaleString('en-US', {hourCycle: 'h24'});
~~~~~~~~~~~~~~~~
Found 1 error.
The generated code then runs fine under Node 12 (I think it's not supported below this version) and in browsers and prints the expected output of the date with requested hour cycle.
Related Issues:
I did not find any.
Activity
BPScott commentedon Aug 12, 2021
This issue can be closed.
As of TypeScript 4.2
hourCycleis present onDateTimeFormatOptions- the interface used for the second parameter oftoLocaleString- when you targetes2020or include it in your lib.This is a TS playground demonstrating that no errors occur if you target es2020