Reduce StreamParser chunk size

marijnh · marijnh · commit 1979f0d6e494 · 2025-08-12T22:10:34.000+02:00
FIX: Make the stream parser user 4 times smaller chunks to reduce the amount of re-parsed code on changes. See https://discuss.codemirror.net/t/old-language-mode-used-in-codemirror-v6-triggers-full-re-parse-of-the-entire-document/9384
diff --git a/src/stream-parser.ts b/src/stream-parser.ts
@@ -181,7 +181,7 @@ function findStartInFragments<State>(lang: StreamLanguage<State>, fragments: rea
 }
 
 const enum C {
-  ChunkSize = 2048,
+  ChunkSize = 512,
   MaxDistanceBeforeViewport = 1e5,
   MaxIndentScanDist = 1e4,
   MaxLineLength = 1e4

Original file line number	Diff line number	Diff line change
`@@ -181,7 +181,7 @@ function findStartInFragments<State>(lang: StreamLanguage<State>, fragments: rea`
`181`	`181`	`}`
`182`	`182`
`183`	`183`	`const enum C {`
`184`		`- ChunkSize = 2048,`
	`184`	`+ ChunkSize = 512,`
`185`	`185`	`MaxDistanceBeforeViewport = 1e5,`
`186`	`186`	`MaxIndentScanDist = 1e4,`
`187`	`187`	`MaxLineLength = 1e4`