"cannot read properties of undefined" after upgrading @codemirror/autocomplete to 6.20.2 #1703

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opened 2026-05-11 16:03:49 +02:00 by olivvybee · 1 comment

olivvybee commented

2026-05-11 16:03:49 +02:00

I'm using codemirror 6.0.2 with the @codemirror/lang-jinja extension at 6.0.1. I've manually installed @codemirror/autocomplete as a dev dependency to access the typescript types to use in my application.

Everything is working fine with @codemirror/autocomplete at version 6.20.1, but as soon as I upgrade to 6.20.2 I start seeing the error Cannot read properties of undefined (reading 'length').

Here's the stack trace:

TypeError: Cannot read properties of undefined (reading 'length')
    at TreeNode.nextChild (index.js:747:85)
    at TreeCursor.enterChild (index.js:1046:42)
    at TreeCursor.firstChild (index.js:1058:32)
    at MixedParse.startInner (index.js:1938:33)
    at MixedParse.advance (index.js:1831:18)
    at MixedParse.advance (index.js:1842:68)
    at index.js:363:39
    at ParseContext.withContext (index.js:398:20)
    at ParseContext.work (index.js:351:21)
    at init (index.js:544:25)
    at StateField.create (index.js:1758:90)
    at Object.create (index.js:1767:42)
    at EditorState.computeSlot (index.js:2748:129)
    at ensureAddr (index.js:2013:25)
    at new EditorState (index.js:2549:13)
    at EditorState.create (index.js:2748:16)

I'm using the jinja extension with variables and properties configuration set.

If I remove the jinja extension from my editor then the error goes away. Just removing the variables or properties from the extension initialiser does not prevent the error.

If I downgrade @codemirror/autocomplete to 6.20.1 then the error also goes away.

I'm using codemirror 6.0.2 with the `@codemirror/lang-jinja` extension at 6.0.1. I've manually installed `@codemirror/autocomplete` as a dev dependency to access the typescript types to use in my application. Everything is working fine with `@codemirror/autocomplete` at version 6.20.1, but as soon as I upgrade to 6.20.2 I start seeing the error `Cannot read properties of undefined (reading 'length')`. Here's the stack trace: ``` TypeError: Cannot read properties of undefined (reading 'length') at TreeNode.nextChild (index.js:747:85) at TreeCursor.enterChild (index.js:1046:42) at TreeCursor.firstChild (index.js:1058:32) at MixedParse.startInner (index.js:1938:33) at MixedParse.advance (index.js:1831:18) at MixedParse.advance (index.js:1842:68) at index.js:363:39 at ParseContext.withContext (index.js:398:20) at ParseContext.work (index.js:351:21) at init (index.js:544:25) at StateField.create (index.js:1758:90) at Object.create (index.js:1767:42) at EditorState.computeSlot (index.js:2748:129) at ensureAddr (index.js:2013:25) at new EditorState (index.js:2549:13) at EditorState.create (index.js:2748:16) ``` I'm using the `jinja` extension with `variables` and `properties` configuration set. If I remove the `jinja` extension from my editor then the error goes away. Just removing the `variables` or `properties` from the extension initialiser does not prevent the error. If I downgrade `@codemirror/autocomplete` to 6.20.1 then the error also goes away.

marijn commented

2026-05-11 16:35:23 +02:00

Owner

Can you check (with npm ls -a) whether any @codemirror or @lezer packages are installed multiple times in your tree after the upgrade? (Disregard the ones that day 'deduplicated'.)

Can you check (with `npm ls -a`) whether any @codemirror or @lezer packages are installed multiple times in your tree after the upgrade? (Disregard the ones that day 'deduplicated'.)

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codemirror/dev#1703

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