@types/utm - Make northern optional in toLatLon method

[JonasTriki]

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).
• Provide a URL to documentation or source code which provides context for the suggested changes: index.es.js#L36 requires northern to be undefined to not throw error.

[typescript-bot]

@JonasTriki Thank you for submitting this PR!

🔔 @civilizeddev - please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

If no reviewer appears after a week, a DefinitelyTyped maintainer will review the PR instead.

[typescript-bot]

👋 Hi there! I’ve run some quick performance metrics against master and your PR. This is still an experiment, so don’t panic if I say something crazy! I’m still learning how to interpret these metrics.

Let’s review the numbers, shall we?

Comparison details 📊

	master	#37527	diff
Batch compilation
Memory usage (MiB)	35.3	35.4	+0.2%
Type count	2025	2025	0.0%
Assignability cache size	99	99	0.0%
Subtype cache size	0	0
Identity cache size	0	0
Language service
Samples taken	43	43	0.0%
Identifiers in tests	43	43	0.0%
getCompletionsAtPosition
Mean duration (ms)	82.9	81.6	-1.6%
Median duration (ms)	82.2	83.2	+1.2%
Mean CV	29.3%	29.6%	+0.9%
Worst duration (ms)	103.7	98.5	-5.1%
Worst identifier	utmCoord1	easting
getQuickInfoAtPosition
Mean duration (ms)	78.4	79.5	+1.4%
Median duration (ms)	77.8	78.8	+1.3%
Mean CV	25.5%	27.4%	+7.4%
Worst duration (ms)	102.4	103.9	+1.5%
Worst identifier	northing	toLatLon

It looks like nothing changed too much. I’m pretty lenient since I’m still an experiment, so take a look anyways and make sure nothing looks out of place.

---

If you have any questions or comments about me, you can ping @andrewbranch. Have a nice day!

[typescript-bot]

After 5 days, no one has reviewed the PR 😞. A maintainer will be reviewing the PR in the next few days and will either merge it or request revisions. Thank you for your patience!

[PranavSenthilnathan]

Since this is adding an author, @civilizeddev can you take a look if you get a chance?

[typescript-bot]

@JonasTriki One or more reviewers has requested changes. Please address their comments. I'll be back once they sign off or you've pushed new commits or comments. Thank you!

[typescript-bot]

@JonasTriki I haven't seen anything from you in a while and this PR currently has problems that prevent it from being merged. The PR will be closed tomorrow if there aren't new commits to fix the issues.

[typescript-bot]

Updated numbers for you here from a3e0eac:

Comparison details 📊

	master	#37527	diff
Batch compilation
Memory usage (MiB)	35.3	35.4	+0.5%
Type count	2025	2026	0.0%
Assignability cache size	99	99	0.0%
Subtype cache size	0	0
Identity cache size	0	0
Language service
Samples taken	43	43	0.0%
Identifiers in tests	43	43	0.0%
getCompletionsAtPosition
Mean duration (ms)	83.1	83.0	-0.1%
Median duration (ms)	81.2	80.3	-1.1%
Mean CV	25.9%	26.7%	+3.1%
Worst duration (ms)	127.1	109.3	-14.0%
Worst identifier	utmCoord2	latLon1
getQuickInfoAtPosition
Mean duration (ms)	80.4	81.5	+1.4%
Median duration (ms)	79.9	81.5	+2.0%
Mean CV	26.8%	27.0%	+1.0%
Worst duration (ms)	110.8	103.9	-6.2%
Worst identifier	toLatLon	fromLatLon

It looks like nothing changed too much. I’m pretty lenient since I’m still an experiment, so take a look anyways and make sure nothing looks out of place.

[typescript-bot]

@JonasTriki The Travis CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[typescript-bot]

Updated numbers for you here from 57d38f1:

Comparison details 📊

	master	#37527	diff
Batch compilation
Memory usage (MiB)	35.3	35.3	-0.1%
Type count	2025	2026	0.0%
Assignability cache size	99	99	0.0%
Subtype cache size	0	0
Identity cache size	0	0
Language service
Samples taken	43	43	0.0%
Identifiers in tests	43	43	0.0%
getCompletionsAtPosition
Mean duration (ms)	81.9	77.5	-5.4%
Median duration (ms)	77.8	77.6	-0.2%
Mean CV	30.0%	28.1%	-6.2%
Worst duration (ms)	103.9	99.3	-4.4%
Worst identifier	easting	zoneLetter
getQuickInfoAtPosition
Mean duration (ms)	79.2	74.3	-6.2%
Median duration (ms)	77.7	74.1	-4.7%
Mean CV	28.2%	26.5%	-6.0%
Worst duration (ms)	98.8	93.6	-5.2%
Worst identifier	toLatLon	lat

It looks like nothing changed too much. I’m pretty lenient since I’m still an experiment, so take a look anyways and make sure nothing looks out of place.

[typescript-bot]

Updated numbers for you here from 5b16cbd:

Comparison details 📊

	master	#37527	diff
Batch compilation
Memory usage (MiB)	35.4	35.5	+0.1%
Type count	2025	2026	0.0%
Assignability cache size	99	99	0.0%
Subtype cache size	0	0
Identity cache size	0	0
Language service
Samples taken	43	43	0.0%
Identifiers in tests	43	43	0.0%
getCompletionsAtPosition
Mean duration (ms)	85.5	85.8	+0.3%
Median duration (ms)	79.7	80.7	+1.3%
Mean CV	29.5%	27.6%	-6.6%
Worst duration (ms)	115.1	119.3	+3.6%
Worst identifier	zoneLetter	northing
getQuickInfoAtPosition
Mean duration (ms)	82.9	84.9	+2.5%
Median duration (ms)	82.2	82.0	-0.2%
Mean CV	26.3%	27.9%	+6.0%
Worst duration (ms)	105.5	101.5	-3.9%
Worst identifier	toLatLon	lat

It looks like nothing changed too much. I’m pretty lenient since I’m still an experiment, so take a look anyways and make sure nothing looks out of place.

[typescript-bot]

🔔 @PranavSenthilnathan - Thanks for your review of this PR! Can you please look at the new code and update your review status if appropriate?