🐛 Biome as auto-formatter in vscode, remoting from windows to macOS, mangles files

[jwatte]

VS Code version

1.106.0

Extension version

3.3.0

Biome version

2.3.2

Operating system

• Windows
• macOS
• Linux

Description

When doing a remote connection (SSH) from vscode running on windows, to a git repo on macOS (a large monorepo managed by rush) I keep getting my typescript files mangled by the auto-formatting function of biome.

It gives seeming phantom errors about code that looks perfectly fine on the screen.
It also will just randomly delete code.
Finally, it will be confused about the size of the file.

Example error dialog:

Example error print:

failed to access range Range { start: Position { line: 0, character: 0 }, end: Position { line: 1020, character: 0 } } in document file:///Users/jwatte/github.com/reve-ai/reve-core/backend/monolith/service/src/cronjobs/summarize-papi-usage-cron.ts LineIndex { newlines: [0, 71, 72, 106, 107, 174, 175, 255, 325, 416, 490, 598, 679, 688, 726, 748, 770, 795, 823, 845, 908, 965, 1035, 1093, 1149, 1209, 1330, 1331, 1423, 1495, 1504, 1538, 1579, 1617, 1660, 
...
34625, 34679, 34720, 34724, 34738, 34789, 34836, 34901, 34954, 34959, 34963, 34965, 34966, 35002, 35022, 35059, 35094, 35115, 35130, 35161, 35170, 35252, 35257, 35318, 35353, 35384, 35409, 35414, 35440, 35473, 35507, 35512, 35546, 35608, 35613, 35627, 35629], line_wide_chars: {} }

Caused by:
    position Position { line: 1020, character: 0 } is out of range

The actual file is 1021 lines long:

Same problem happens with the prerelease version of the extension.

This vaguely smells like maybe LF vs CRLF confusion?

Steps to reproduce

Remote connect from vscode on Windows to macOS
Edit typescript files

Expected behavior

No code mangling, no confusion about how long files are.

Does this issue occur when using the CLI directly?

Not sure / Not applicable

Link to a minimal reproduction

No response

Logs

See above.

[hyoretsu]

I have the same error. Sometimes it keeps old copies of files when formatting and breaks things, sometimes it gets stuck at something and simply refuses to work anymore.
https://gist.github.com/hyoretsu/5f33a9dea3d864d3a1b3fc65de144538

2026-01-13 15:19:17.871 [info] [Error - 3:19:17 PM] Request textDocument/codeAction failed.
2026-01-13 15:19:17.872 [info]   Message: failed to access range Range { start: Position { line: 0, character: 0 }, end: Position { line: 176, character: 0 } } in document file:///home/hyoretsu/Projects/%40bk-company/bk-dash-backend/src/modules/products/services/GenerateProductCostCsv.ts LineIndex { newlines: [0, 39, 149, 193, 240, 318, 366, 410, 444, 477, 478, 502, 530, 550, 572, 600, 620, 642, 644, 645, 684, 698, 712, 750, 765, 809, 895, 902, 903, 988, 1058, 1066, 1084, 1143, 1154, 1163, 1171, 1190, 1215, 1246, 1274, 1307, 1318, 1327, 1358, 1366, 1386, 1438, 1490, 1530, 1574, 1618, 1650, 1661, 1670, 1677, 1731, 1785, 1786, 1819, 1860, 1898, 1929, 1970, 2009, 2010, 2038, 2053, 2070, 2076, 2104, 2123, 2147, 2156, 2162, 2163, 2229, 2245, 2264, 2285, 2316, 2329, 2349, 2376, 2404, 2431, 2452, 2476, 2505, 2538, 2570, 2602, 2619, 2642, 2676, 2730, 2763, 2807, 2831, 2855, 2884, 2950, 2967, 2982, 3011, 3024, 3043, 3075, 3086, 3111, 3120, 3135, 3154, 3172, 3193, 3215, 3249, 3277, 3316, 3335, 3352, 3367, 3380, 3391, 3417, 3455, 3479, 3488, 3495, 3496, 3518, 3526, 3550, 3581, 3605, 3636, 3655, 3677, 3697, 3717, 3733, 3753, 3762, 3768, 3769, 3800, 3908, 3949, 3973, 3974, 4019, 4035, 4082, 4188, 4196, 4197, 4288, 4394, 4417, 4418, 4467, 4539, 4540, 4565, 4566, 4601, 4608, 4637, 4754, 4762, 4763, 4764, 4849, 4853, 4855], line_wide_chars: {} }
  Code: -32603 
failed to access range Range { start: Position { line: 0, character: 0 }, end: Position { line: 176, character: 0 } } in document file:///home/hyoretsu/Projects/%40bk-company/bk-dash-backend/src/modules/products/services/GenerateProductCostCsv.ts LineIndex { newlines: [0, 39, 149, 193, 240, 318, 366, 410, 444, 477, 478, 502, 530, 550, 572, 600, 620, 642, 644, 645, 684, 698, 712, 750, 765, 809, 895, 902, 903, 988, 1058, 1066, 1084, 1143, 1154, 1163, 1171, 1190, 1215, 1246, 1274, 1307, 1318, 1327, 1358, 1366, 1386, 1438, 1490, 1530, 1574, 1618, 1650, 1661, 1670, 1677, 1731, 1785, 1786, 1819, 1860, 1898, 1929, 1970, 2009, 2010, 2038, 2053, 2070, 2076, 2104, 2123, 2147, 2156, 2162, 2163, 2229, 2245, 2264, 2285, 2316, 2329, 2349, 2376, 2404, 2431, 2452, 2476, 2505, 2538, 2570, 2602, 2619, 2642, 2676, 2730, 2763, 2807, 2831, 2855, 2884, 2950, 2967, 2982, 3011, 3024, 3043, 3075, 3086, 3111, 3120, 3135, 3154, 3172, 3193, 3215, 3249, 3277, 3316, 3335, 3352, 3367, 3380, 3391, 3417, 3455, 3479, 3488, 3495, 3496, 3518, 3526, 3550, 3581, 3605, 3636, 3655, 3677, 3697, 3717, 3733, 3753, 3762, 3768, 3769, 3800, 3908, 3949, 3973, 3974, 4019, 4035, 4082, 4188, 4196, 4197, 4288, 4394, 4417, 4418, 4467, 4539, 4540, 4565, 4566, 4601, 4608, 4637, 4754, 4762, 4763, 4764, 4849, 4853, 4855], line_wide_chars: {} }

Caused by:
    position Position { line: 176, character: 0 } is out of range

It is for a fact an error because if I simply run "Biome: Restart" it starts working again. I'm using Remote Tunnel extension.