Introduce grammar patch from the simplify branch
#4019
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This was referenced Oct 10, 2025
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Authored by: Lea Verou <[email protected]>
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DmitrySharabin
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| return source; | ||
| } | ||
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| return source ?? target; |
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I updated this part to handle the $merge special property correctly. Before, it was target ?? source, and we couldn't merge numbers, strings, regexes, etc.
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Summary
isObject(),isPlainObject(),deepMerge(),deepClone(),betterAssign(),insert(), andinsertAfter(). UpdateinsertBefore()accordingly.extend()to support new special properties ($insertBefore,insertAfter,$insert,$delete, and$merge) that allow defining grammars more declaratively and adding a newgrammarPatch()util (all authored by @LeaVerou). See [v2] Language combinations / extensions / embeddings / ... #3927 for details.Those are non-breaking changes. Corresponding changes to language definitions are in a separate PR.
This is part 2 of 3 in a stack made with GitButler:
simplifybranch #4019 👈languagesfrom thesimplifybranch #4016