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The flow-language-server responds with different error messages for changing files than it does for saving files · Issue #7009 · facebook/flow · GitHub
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Description
Originally reported here: dense-analysis/ale#2000
If you send a textDocument/didSave event to the flow language server, you will get some diagnostic information revealing some type errors, like so:
{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/w0rp/Downloads/ale-flow/demo.js","diagnostics":[{"range":{"start":{"line":3,"character":13},"end":{"line":3,"character":24}},"severity":1,"code":"InferError","source":"Flow","message":"Cannot assign object literal to `a` because property `a` is missing in object literal [1] but exists in `A` [2].","relatedInformation":[{"location":{"uri":"file:///home/w0rp/Downloads/ale-flow/demo.js","range":{"start":{"line":3,"character":13},"end":{"line":3,"character":24}}},"message":"[1] object literal"},{"location":{"uri":"file:///home/w0rp/Downloads/ale-flow/demo.js","range":{"start":{"line":3,"character":9},"end":{"line":3,"character":10}}},"message":"[2] `A`"}],"relatedLocations":[{"location":{"uri":"file:///home/w0rp/Downloads/ale-flow/demo.js","range":{"start":{"line":3,"character":13},"end":{"line":3,"character":24}}},"message":"[1] object literal"},{"location":{"uri":"file:///home/w0rp/Downloads/ale-flow/demo.js","range":{"start":{"line":3,"character":9},"end":{"line":3,"character":10}}},"message":"[2] `A`"}]}]}}
Sending a textDocument/didChange event with the contents of the entire file will cause flow to respond with no errors, like so.
{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/w0rp/Downloads/ale-flow/demo.js","diagnostics":[]}}
You can repeat the bug with some LSP clients like ALE with the following project: https://github.com/joeybaker/ale-flow
This seems to be broken since 0.83.0. What flow should do instead is return the same error messages in both cases. If there are errors that can only be resolved after saving the file, those errors should be returned in response to the textDocument/didChange event until the next textDocument/didSave event is sent.
joeybaker, villesau, badeleux, agreene-coursera, LukeChannings and 5 more
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