Ace does provide support for autocompletion via the ace/ext/language_tools package. There's a wiki page with some admittedly sparse details:
https://github.com/ajaxorg/ace/wiki/How-to-enable-Autocomplete-in-the-Ace-editor

The wiki includes a link to a demo, however, which is useful for seeing how to implement your own autocompletion. We'd presumably want to do something similar, calling back to some PureScript code to provide the completions:
https://plnkr.co/edit/6MVntVmXYUbjR0DI82Cr?p=preview&preview

There is existing PureScript code written around autocompletions in this context, namely in the purescript-language-server package. From a glance through that package, this looks relevant (but I'd like to hear if @nwolverson has any suggestions for doing this in an Ace context):

https://github.com/nwolverson/purescript-language-server/blob/78086f60f2741d5fe52bbad8572c107863091eb8/src/IdePurescript/Completion.purs#L73-L84

Of course, then there's the second concern: once we have the autocomplete suggestion and the user selects it, then we have to actually update the imports properly in the editor; I'm not exactly sure where this is done in the language server.

Autocomplete #32

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