docs(handbook): fix heading level for "Truthiness narrowing"#3580
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RyanCavanaugh merged 1 commit intoJun 5, 2026
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In the Narrowing handbook page, the "Truthiness narrowing" heading was written as an H1 (`#`) instead of an H2 (`##`). It sits alongside the other narrowing kinds (`typeof type guards`, `Equality narrowing`, `in operator narrowing`, etc.) which are all H2, so it should be H2 too. The H1 caused the on-page Table of Contents to nest every subsequent sibling section under "Truthiness narrowing", giving readers the impression that Equality / in / instanceof narrowing etc. are sub-concepts of truthiness. Refs microsoft/TypeScript#63531
RyanCavanaugh
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Jun 5, 2026
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Summary
Fixes the heading level for "Truthiness narrowing" in the Narrowing handbook page, reported in microsoft/TypeScript#63531.
The heading was written as an H1 (
# Truthiness narrowing) but every other narrowing kind on the same page —typeof type guards,Equality narrowing,in operator narrowing,instanceof narrowing,Assignments,Control flow analysis,Using type predicates,Assertion functions— is an H2. As a result the on-page Table of Contents nested all of those siblings under "Truthiness narrowing", giving readers the impression they're sub-concepts of truthiness.Change
packages/documentation/copy/en/handbook-v2/Narrowing.md, one character.Refs
AI disclosure
Used Claude to locate the file in this repo (the issue was filed on
microsoft/TypeScript, not here) and to draft this description. The change itself is trivial — verified by inspecting the surrounding H2 siblings.