fix(windows): use vim.json.decode to avoid E5560 in fast-event context - #327
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nickjvandyke merged 1 commit intoSep 14, 2026
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vim.fn.json_decode is a Vimscript function call, which Neovim forbids from fast-event contexts such as the vim.uv timer/job callback used during Windows server discovery. This raised E5560, which the surrounding pcall then mislabeled as a JSON parse failure. vim.json.decode is Lua-native and callable from fast-event context, and is API-equivalent for this use, so parsing behavior is unchanged.
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Description
On Windows, server discovery sometimes surfaced
E5560: Vimscript function "json_decode" must not be called in a fast event context, which the surroundingpcallmislabeled as a JSON parse failure.vim.fn.json_decodeis a Vimscript function call, which Neovim forbids from the fast-event context used by thevim.uvtimer/job callback during Windows process discovery. This PR replaces it withvim.json.decode, which is Lua-native, API-equivalent for this use, and callable from fast-event context — so theE5560error no longer occurs and parsing behavior is unchanged.Testing
E5560notification appears instead of the process being discovered.vim.json.decodeparses the PowerShell JSON output identically tovim.fn.json_decode(single-object and array forms).Related Issue(s)
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