Bug Report

🔎 Search Terms

visitEachChild, SourceFile

🕗 Version & Regression Information

• This changed between versions 4.8. and 4.9

💻 Code

I'm using ts-patch that allows me to apply a transformer, in this case I use https://github.com/kimamula/ts-transformer-keys.
What it does is that it traveres all nodes and does some simply modification on it, it stopped working on ts 4.9 though.
(see also nonara/ts-patch#81)

After digging into it, it touched all nodes in 4.8:

visitNode SourceFile
visitNode ImportDeclaration
visitNode StringLiteral
... etc

but in 4.9 it didn't go any further after the first node (stopped after visitNode SourceFile), so I was looking into related changes and found https://github.com/microsoft/TypeScript/pull/50266/files#diff-044e53f5c31ee19a4e3fca606c4b4ab8d5618ec9b740aa2e01960a8fbbad6eb2R1288

If you compare the change with the preivous lines:
https://github.com/microsoft/TypeScript/pull/50266/files#diff-044e53f5c31ee19a4e3fca606c4b4ab8d5618ec9b740aa2e01960a8fbbad6eb2L1282

it turns out that visitLexicalEnvironment(node.statements, visitor, context, /start/ undefined, /ensureUseStrict/ undefined, nodesVisitor));
got some more parameters, especially the "nodesVisitor".

If I remove this paramter again, all things are working again! Therefore I assume this is a bug, but please double check my findings :)

🙁 Actual behavior

Not traversing the tree correctly.

🙂 Expected behavior

Should work like in ts 4.8