feat(completion): stdlib virtual path completion & exportable completion (#15270)

# Description

More completions for `use` command.

~Also optimizes the span fix of #15238 to allow changing the text after
the cursor.~

# User-Facing Changes

<img width="299" alt="image"
src="https://github.com/user-attachments/assets/a5c45f46-40e4-4c50-9408-7b147ed11dc4"
/>

<img width="383" alt="image"
src="https://github.com/user-attachments/assets/fbeec173-511e-4c72-8995-bc1caa3ef0d3"
/>


# Tests + Formatting

+3

# After Submitting

Cargo.lock

@@ -3542,6 +3542,7 @@ dependencies = [
  "nu-path",
  "nu-plugin-engine",
  "nu-protocol",
+ "nu-std",
  "nu-test-support",
  "nu-utils",
  "nucleo-matcher",
@@ -3827,6 +3828,7 @@ dependencies = [
  "nu-glob",
  "nu-parser",
  "nu-protocol",
+ "nu-std",
  "nu-test-support",
  "nu-utils",
  "nucleo-matcher",

crates/nu-cli/Cargo.toml

@@ -13,6 +13,7 @@ bench = false
 [dev-dependencies]
 nu-cmd-lang = { path = "../nu-cmd-lang", version = "0.103.1" }
 nu-command = { path = "../nu-command", version = "0.103.1" }
+nu-std = { path = "../nu-std", version = "0.103.1" }
 nu-test-support = { path = "../nu-test-support", version = "0.103.1" }
 rstest = { workspace = true, default-features = false }
 tempfile = { workspace = true }

crates/nu-cli/src/completions/completer.rs

@@ -1,21 +1,20 @@
 use crate::completions::{
+    base::{SemanticSuggestion, SuggestionKind},
     AttributableCompletion, AttributeCompletion, CellPathCompletion, CommandCompletion, Completer,
-    CompletionOptions, CustomCompletion, DirectoryCompletion, DotNuCompletion, FileCompletion,
-    FlagCompletion, OperatorCompletion, VariableCompletion,
+    CompletionOptions, CustomCompletion, DirectoryCompletion, DotNuCompletion,
+    ExportableCompletion, FileCompletion, FlagCompletion, OperatorCompletion, VariableCompletion,
 };
 use nu_color_config::{color_record_to_nustyle, lookup_ansi_color_style};
 use nu_engine::eval_block;
-use nu_parser::{flatten_expression, parse};
+use nu_parser::{flatten_expression, parse, parse_module_file_or_dir};
 use nu_protocol::{
-    ast::{Argument, Block, Expr, Expression, FindMapResult, Traverse},
+    ast::{Argument, Block, Expr, Expression, FindMapResult, ListItem, Traverse},
     debugger::WithoutDebug,
     engine::{Closure, EngineState, Stack, StateWorkingSet},
     PipelineData, Span, Type, Value,
 };
 use reedline::{Completer as ReedlineCompleter, Suggestion};
-use std::{str, sync::Arc};
-
-use super::base::{SemanticSuggestion, SuggestionKind};
+use std::sync::Arc;
 
 /// Used as the function `f` in find_map Traverse
 ///
@@ -57,8 +56,13 @@ fn find_pipeline_element_by_position<'a>(
         Expr::FullCellPath(fcp) => fcp
             .head
             .find_map(working_set, &closure)
-            .or(Some(expr))
             .map(FindMapResult::Found)
+            // e.g. use std/util [<tab>
+            .or_else(|| {
+                (fcp.head.span.contains(pos) && matches!(fcp.head.expr, Expr::List(_)))
+                    .then_some(FindMapResult::Continue)
+            })
+            .or(Some(FindMapResult::Found(expr)))
             .unwrap_or_default(),
         Expr::Var(_) => FindMapResult::Found(expr),
         Expr::AttributeBlock(ab) => ab
@@ -127,6 +131,18 @@ struct Context<'a> {
     offset: usize,
 }
 
+/// For argument completion
+struct PositionalArguments<'a> {
+    /// command name
+    command_head: &'a [u8],
+    /// indices of positional arguments
+    positional_arg_indices: Vec<usize>,
+    /// argument list
+    arguments: &'a [Argument],
+    /// expression of current argument
+    expr: &'a Expression,
+}
+
 impl Context<'_> {
     fn new<'a>(
         working_set: &'a StateWorkingSet,
@@ -328,7 +344,8 @@ impl NuCompleter {
                 // NOTE: the argument to complete is not necessarily the last one
                 // for lsp completion, we don't trim the text,
                 // so that `def`s after pos can be completed
-                for arg in call.arguments.iter() {
+                let mut positional_arg_indices = Vec::new();
+                for (arg_idx, arg) in call.arguments.iter().enumerate() {
                     let span = arg.span();
                     if span.contains(pos) {
                         // if customized completion specified, it has highest priority
@@ -379,9 +396,15 @@ impl NuCompleter {
                             // complete according to expression type and command head
                             Argument::Positional(expr) => {
                                 let command_head = working_set.get_span_contents(call.head);
+                                positional_arg_indices.push(arg_idx);
                                 self.argument_completion_helper(
-                                    command_head,
-                                    expr,
+                                    PositionalArguments {
+                                        command_head,
+                                        positional_arg_indices,
+                                        arguments: &call.arguments,
+                                        expr,
+                                    },
+                                    pos,
                                     &ctx,
                                     suggestions.is_empty(),
                                 )
@@ -389,6 +412,8 @@ impl NuCompleter {
                             _ => vec![],
                         });
                         break;
+                    } else if !matches!(arg, Argument::Named(_)) {
+                        positional_arg_indices.push(arg_idx);
                     }
                 }
             }
@@ -498,18 +523,95 @@ impl NuCompleter {
 
     fn argument_completion_helper(
         &self,
-        command_head: &[u8],
-        expr: &Expression,
+        argument_info: PositionalArguments,
+        pos: usize,
         ctx: &Context,
         need_fallback: bool,
     ) -> Vec<SemanticSuggestion> {
+        let PositionalArguments {
+            command_head,
+            positional_arg_indices,
+            arguments,
+            expr,
+        } = argument_info;
         // special commands
         match command_head {
             // complete module file/directory
-            // TODO: if module file already specified,
+            b"use" | b"export use" | b"overlay use" | b"source-env"
+                if positional_arg_indices.len() == 1 =>
+            {
+                return self.process_completion(
+                    &mut DotNuCompletion {
+                        std_virtual_path: command_head != b"source-env",
+                    },
+                    ctx,
+                );
+            }
+            // NOTE: if module file already specified,
             // should parse it to get modules/commands/consts to complete
-            b"use" | b"export use" | b"overlay use" | b"source-env" => {
-                return self.process_completion(&mut DotNuCompletion, ctx);
+            b"use" | b"export use" => {
+                let Some(Argument::Positional(Expression {
+                    expr: Expr::String(module_name),
+                    span,
+                    ..
+                })) = positional_arg_indices
+                    .first()
+                    .and_then(|i| arguments.get(*i))
+                else {
+                    return vec![];
+                };
+                let module_name = module_name.as_bytes();
+                let (module_id, temp_working_set) = match ctx.working_set.find_module(module_name) {
+                    Some(module_id) => (module_id, None),
+                    None => {
+                        let mut temp_working_set =
+                            StateWorkingSet::new(ctx.working_set.permanent_state);
+                        let Some(module_id) = parse_module_file_or_dir(
+                            &mut temp_working_set,
+                            module_name,
+                            *span,
+                            None,
+                        ) else {
+                            return vec![];
+                        };
+                        (module_id, Some(temp_working_set))
+                    }
+                };
+                let mut exportable_completion = ExportableCompletion {
+                    module_id,
+                    temp_working_set,
+                };
+                let mut complete_on_list_items = |items: &[ListItem]| -> Vec<SemanticSuggestion> {
+                    for item in items {
+                        let span = item.expr().span;
+                        if span.contains(pos) {
+                            let offset = span.start.saturating_sub(ctx.span.start);
+                            let end_offset =
+                                ctx.prefix.len().min(pos.min(span.end) - ctx.span.start + 1);
+                            let new_ctx = Context::new(
+                                ctx.working_set,
+                                Span::new(span.start, ctx.span.end.min(span.end)),
+                                ctx.prefix.get(offset..end_offset).unwrap_or_default(),
+                                ctx.offset,
+                            );
+                            return self.process_completion(&mut exportable_completion, &new_ctx);
+                        }
+                    }
+                    vec![]
+                };
+
+                match &expr.expr {
+                    Expr::String(_) => {
+                        return self.process_completion(&mut exportable_completion, ctx);
+                    }
+                    Expr::FullCellPath(fcp) => match &fcp.head.expr {
+                        Expr::List(items) => {
+                            return complete_on_list_items(items);
+                        }
+                        _ => return vec![],
+                    },
+                    _ => return vec![],
+                }
             }
             b"which" => {
                 let mut completer = CommandCompletion {

crates/nu-cli/src/completions/completion_common.rs

@@ -150,7 +150,7 @@ impl OriginalCwd {
     }
 }
 
-fn surround_remove(partial: &str) -> String {
+pub fn surround_remove(partial: &str) -> String {
     for c in ['`', '"', '\''] {
         if partial.starts_with(c) {
             let ret = partial.strip_prefix(c).unwrap_or(partial);

crates/nu-cli/src/completions/dotnu_completions.rs

@@ -1,18 +1,23 @@
-use crate::completions::{file_path_completion, Completer, CompletionOptions};
+use crate::completions::{
+    completion_common::{surround_remove, FileSuggestion},
+    completion_options::NuMatcher,
+    file_path_completion, Completer, CompletionOptions, SemanticSuggestion, SuggestionKind,
+};
 use nu_path::expand_tilde;
 use nu_protocol::{
-    engine::{Stack, StateWorkingSet},
+    engine::{Stack, StateWorkingSet, VirtualPath},
     Span,
 };
 use reedline::Suggestion;
 use std::{
     collections::HashSet,
-    path::{is_separator, PathBuf, MAIN_SEPARATOR as SEP, MAIN_SEPARATOR_STR},
+    path::{is_separator, PathBuf, MAIN_SEPARATOR_STR},
 };
 
-use super::{SemanticSuggestion, SuggestionKind};
-
-pub struct DotNuCompletion;
+pub struct DotNuCompletion {
+    /// e.g. use std/a<tab>
+    pub std_virtual_path: bool,
+}
 
 impl Completer for DotNuCompletion {
     fn fetch(
@@ -102,7 +107,7 @@ impl Completer for DotNuCompletion {
 
         // Fetch the files filtering the ones that ends with .nu
         // and transform them into suggestions
-        let completions = file_path_completion(
+        let mut completions = file_path_completion(
             span,
             partial,
             &search_dirs
@@ -113,17 +118,60 @@ impl Completer for DotNuCompletion {
             working_set.permanent_state,
             stack,
         );
+
+        if self.std_virtual_path {
+            let mut matcher = NuMatcher::new(partial, options);
+            let base_dir = surround_remove(&base_dir);
+            if base_dir == "." {
+                let surround_prefix = partial
+                    .chars()
+                    .take_while(|c| "`'\"".contains(*c))
+                    .collect::<String>();
+                for path in ["std", "std-rfc"] {
+                    let path = format!("{}{}", surround_prefix, path);
+                    matcher.add(
+                        path.clone(),
+                        FileSuggestion {
+                            span,
+                            path,
+                            style: None,
+                            is_dir: true,
+                        },
+                    );
+                }
+            } else if let Some(VirtualPath::Dir(sub_paths)) =
+                working_set.find_virtual_path(&base_dir)
+            {
+                for sub_vp_id in sub_paths {
+                    let (path, sub_vp) = working_set.get_virtual_path(*sub_vp_id);
+                    let path = path
+                        .strip_prefix(&format!("{}/", base_dir))
+                        .unwrap_or(path)
+                        .to_string();
+                    matcher.add(
+                        path.clone(),
+                        FileSuggestion {
+                            path,
+                            span,
+                            style: None,
+                            is_dir: matches!(sub_vp, VirtualPath::Dir(_)),
+                        },
+                    );
+                }
+            }
+            completions.extend(matcher.results());
+        }
+
         completions
             .into_iter()
             // Different base dir, so we list the .nu files or folders
             .filter(|it| {
                 // for paths with spaces in them
                 let path = it.path.trim_end_matches('`');
-                path.ends_with(".nu") || path.ends_with(SEP)
+                path.ends_with(".nu") || it.is_dir
             })
             .map(|x| {
-                let append_whitespace =
-                    x.path.ends_with(".nu") && (!start_with_backquote || end_with_backquote);
+                let append_whitespace = !x.is_dir && (!start_with_backquote || end_with_backquote);
                 // Re-calculate the span to replace
                 let mut span_offset = 0;
                 let mut value = x.path.to_string();

crates/nu-cli/src/completions/exportable_completions.rs

@@ -0,0 +1,111 @@
+use crate::completions::{
+    completion_common::surround_remove, completion_options::NuMatcher, Completer,
+    CompletionOptions, SemanticSuggestion, SuggestionKind,
+};
+use nu_protocol::{
+    engine::{Stack, StateWorkingSet},
+    ModuleId, Span,
+};
+use reedline::Suggestion;
+
+pub struct ExportableCompletion<'a> {
+    pub module_id: ModuleId,
+    pub temp_working_set: Option<StateWorkingSet<'a>>,
+}
+
+/// If name contains space, wrap it in quotes
+fn wrapped_name(name: String) -> String {
+    if !name.contains(' ') {
+        return name;
+    }
+    if name.contains('\'') {
+        format!("\"{}\"", name.replace('"', r#"\""#))
+    } else {
+        format!("'{name}'")
+    }
+}
+
+impl Completer for ExportableCompletion<'_> {
+    fn fetch(
+        &mut self,
+        working_set: &StateWorkingSet,
+        _stack: &Stack,
+        prefix: impl AsRef<str>,
+        span: Span,
+        offset: usize,
+        options: &CompletionOptions,
+    ) -> Vec<SemanticSuggestion> {
+        let mut matcher = NuMatcher::<()>::new(surround_remove(prefix.as_ref()), options);
+        let mut results = Vec::new();
+        let span = reedline::Span {
+            start: span.start - offset,
+            end: span.end - offset,
+        };
+        // TODO: use matcher.add_lazy to lazy evaluate an item if it matches the prefix
+        let mut add_suggestion = |value: String,
+                                  description: Option<String>,
+                                  extra: Option<Vec<String>>,
+                                  kind: SuggestionKind| {
+            results.push(SemanticSuggestion {
+                suggestion: Suggestion {
+                    value,
+                    span,
+                    description,
+                    extra,
+                    ..Suggestion::default()
+                },
+                kind: Some(kind),
+            });
+        };
+
+        let working_set = self.temp_working_set.as_ref().unwrap_or(working_set);
+        let module = working_set.get_module(self.module_id);
+
+        for (name, decl_id) in &module.decls {
+            let name = String::from_utf8_lossy(name).to_string();
+            if matcher.matches(&name) {
+                let cmd = working_set.get_decl(*decl_id);
+                add_suggestion(
+                    wrapped_name(name),
+                    Some(cmd.description().to_string()),
+                    None,
+                    SuggestionKind::Command(cmd.command_type()),
+                );
+            }
+        }
+        for (name, module_id) in &module.submodules {
+            let name = String::from_utf8_lossy(name).to_string();
+            if matcher.matches(&name) {
+                let comments = working_set.get_module_comments(*module_id).map(|spans| {
+                    spans
+                        .iter()
+                        .map(|sp| {
+                            String::from_utf8_lossy(working_set.get_span_contents(*sp)).into()
+                        })
+                        .collect::<Vec<String>>()
+                });
+                add_suggestion(
+                    wrapped_name(name),
+                    Some("Submodule".into()),
+                    comments,
+                    SuggestionKind::Module,
+                );
+            }
+        }
+        for (name, var_id) in &module.constants {
+            let name = String::from_utf8_lossy(name).to_string();
+            if matcher.matches(&name) {
+                let var = working_set.get_variable(*var_id);
+                add_suggestion(
+                    wrapped_name(name),
+                    var.const_val
+                        .as_ref()
+                        .and_then(|v| v.clone().coerce_into_string().ok()),
+                    None,
+                    SuggestionKind::Variable,
+                );
+            }
+        }
+        results
+    }
+}

crates/nu-cli/src/completions/flag_completions.rs

@@ -1,12 +1,12 @@
-use crate::completions::{completion_options::NuMatcher, Completer, CompletionOptions};
+use crate::completions::{
+    completion_options::NuMatcher, Completer, CompletionOptions, SemanticSuggestion, SuggestionKind,
+};
 use nu_protocol::{
     engine::{Stack, StateWorkingSet},
     DeclId, Span,
 };
 use reedline::Suggestion;
 
-use super::{SemanticSuggestion, SuggestionKind};
-
 #[derive(Clone)]
 pub struct FlagCompletion {
     pub decl_id: DeclId,

crates/nu-cli/src/completions/mod.rs

@@ -8,6 +8,7 @@ mod completion_options;
 mod custom_completions;
 mod directory_completions;
 mod dotnu_completions;
+mod exportable_completions;
 mod file_completions;
 mod flag_completions;
 mod operator_completions;
@@ -22,6 +23,7 @@ pub use completion_options::{CompletionOptions, MatchAlgorithm};
 pub use custom_completions::CustomCompletion;
 pub use directory_completions::DirectoryCompletion;
 pub use dotnu_completions::DotNuCompletion;
+pub use exportable_completions::ExportableCompletion;
 pub use file_completions::{file_path_completion, FileCompletion};
 pub use flag_completions::FlagCompletion;
 pub use operator_completions::OperatorCompletion;

crates/nu-cli/tests/completions/mod.rs

@@ -11,6 +11,7 @@ use nu_engine::eval_block;
 use nu_parser::parse;
 use nu_path::expand_tilde;
 use nu_protocol::{debugger::WithoutDebug, engine::StateWorkingSet, Config, PipelineData};
+use nu_std::load_standard_library;
 use reedline::{Completer, Suggestion};
 use rstest::{fixture, rstest};
 use support::{
@@ -513,7 +514,7 @@ fn dotnu_completions() {
 
     match_suggestions(&vec!["sub.nu`"], &suggestions);
 
-    let expected = vec![
+    let mut expected = vec![
         "asdf.nu",
         "bar.nu",
         "bat.nu",
@@ -546,6 +547,8 @@ fn dotnu_completions() {
     match_suggestions(&expected, &suggestions);
 
     // Test use completion
+    expected.push("std");
+    expected.push("std-rfc");
     let completion_str = "use ";
     let suggestions = completer.complete(completion_str, completion_str.len());
 
@@ -577,6 +580,65 @@ fn dotnu_completions() {
     match_dir_content_for_dotnu(dir_content, &suggestions);
 }
 
+#[test]
+fn dotnu_stdlib_completions() {
+    let (_, _, mut engine, stack) = new_dotnu_engine();
+    assert!(load_standard_library(&mut engine).is_ok());
+    let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
+
+    let completion_str = "export use std/ass";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["assert"], &suggestions);
+
+    let completion_str = "use `std-rfc/cli";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["clip"], &suggestions);
+
+    let completion_str = "use \"std";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["\"std", "\"std-rfc"], &suggestions);
+
+    let completion_str = "overlay use \'std-rfc/cli";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["clip"], &suggestions);
+}
+
+#[test]
+fn exportable_completions() {
+    let (_, _, mut engine, mut stack) = new_dotnu_engine();
+    let code = r#"export module "🤔🐘" {
+        export const foo = "🤔🐘";
+    }"#;
+    assert!(support::merge_input(code.as_bytes(), &mut engine, &mut stack).is_ok());
+    assert!(load_standard_library(&mut engine).is_ok());
+
+    let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
+
+    let completion_str = "use std null";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["null-device", "null_device"], &suggestions);
+
+    let completion_str = "export use std/assert eq";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["equal"], &suggestions);
+
+    let completion_str = "use std/assert \"not eq";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["'not equal'"], &suggestions);
+
+    let completion_str = "use std-rfc/clip ['prefi";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["prefix"], &suggestions);
+
+    let completion_str = "use std/math [E, `TAU";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["TAU"], &suggestions);
+
+    let completion_str = "use 🤔🐘 'foo";
+    let suggestions = completer.complete(completion_str, completion_str.len());
+    match_suggestions(&vec!["foo"], &suggestions);
+}
+
 #[test]
 fn dotnu_completions_const_nu_lib_dirs() {
     let (_, _, engine, stack) = new_dotnu_engine();

crates/nu-lsp/Cargo.toml

@@ -28,6 +28,7 @@ url = { workspace = true }
 nu-cmd-lang = { path = "../nu-cmd-lang", version = "0.103.1" }
 nu-command = { path = "../nu-command", version = "0.103.1" }
 nu-engine = { path = "../nu-engine", version = "0.103.1" }
+nu-std = { path = "../nu-std", version = "0.103.1" }
 nu-test-support = { path = "../nu-test-support", version = "0.103.1" }
 
 assert-json-diff = "2.0"

crates/nu-lsp/src/completion.rs

@@ -28,22 +28,15 @@ impl LanguageServer {
                 .and_then(|s| s.chars().next())
                 .is_some_and(|c| c.is_whitespace() || "|(){}[]<>,:;".contains(c));
 
-        let (results, engine_state) = if need_fallback {
-            let engine_state = Arc::new(self.initial_engine_state.clone());
-            let completer = NuCompleter::new(engine_state.clone(), Arc::new(Stack::new()));
-            (
-                completer.fetch_completions_at(&file_text[..location], location),
-                engine_state,
-            )
+        self.need_parse |= need_fallback;
+        let engine_state = Arc::new(self.new_engine_state());
+        let completer = NuCompleter::new(engine_state.clone(), Arc::new(Stack::new()));
+        let results = if need_fallback {
+            completer.fetch_completions_at(&file_text[..location], location)
         } else {
-            let engine_state = Arc::new(self.new_engine_state());
-            let completer = NuCompleter::new(engine_state.clone(), Arc::new(Stack::new()));
             let file_path = uri_to_path(&path_uri);
             let filename = file_path.to_str()?;
-            (
-                completer.fetch_completions_within_file(filename, location, &file_text),
-                engine_state,
-            )
+            completer.fetch_completions_within_file(filename, location, &file_text)
         };
 
         let docs = self.docs.lock().ok()?;
@@ -63,10 +56,8 @@ impl LanguageServer {
                     }
 
                     let span = r.suggestion.span;
-                    let range = span_to_range(&Span::new(span.start, span.end), file, 0);
-
                     let text_edit = Some(CompletionTextEdit::Edit(TextEdit {
-                        range,
+                        range: span_to_range(&Span::new(span.start, span.end), file, 0),
                         new_text: label_value.clone(),
                     }));
 
@@ -236,7 +227,7 @@ mod tests {
                     "detail": "Edit nu configurations.",
                     "textEdit": { "range": { "start": { "line": 0, "character": 0 }, "end": { "line": 0, "character": 8 }, },
                         "newText": "config nu "
-                    }
+                    },
                 },
             ])
         );
@@ -549,4 +540,96 @@ mod tests {
             ])
         );
     }
+
+    #[test]
+    fn complete_use_arguments() {
+        let (client_connection, _recv) = initialize_language_server(None, None);
+
+        let mut script = fixtures();
+        script.push("lsp");
+        script.push("completion");
+        script.push("use.nu");
+        let script = path_to_uri(&script);
+
+        open_unchecked(&client_connection, script.clone());
+        let resp = send_complete_request(&client_connection, script.clone(), 4, 17);
+        assert_json_include!(
+            actual: result_from_message(resp),
+            expected: serde_json::json!([
+                {
+                    "label": "std-rfc",
+                    "labelDetails": { "description": "module" },
+                    "textEdit": {
+                        "newText": "std-rfc",
+                        "range": { "start": { "character": 11, "line": 4 }, "end": { "character": 17, "line": 4 } }
+                    },
+                    "kind": 9 // module kind
+                }
+            ])
+        );
+
+        let resp = send_complete_request(&client_connection, script.clone(), 5, 22);
+        assert_json_include!(
+            actual: result_from_message(resp),
+            expected: serde_json::json!([
+                {
+                    "label": "clip",
+                    "labelDetails": { "description": "module" },
+                    "textEdit": {
+                        "newText": "clip",
+                        "range": { "start": { "character": 19, "line": 5 }, "end": { "character": 23, "line": 5 } }
+                    },
+                    "kind": 9 // module kind
+                }
+            ])
+        );
+
+        let resp = send_complete_request(&client_connection, script.clone(), 5, 35);
+        assert_json_include!(
+            actual: result_from_message(resp),
+            expected: serde_json::json!([
+                {
+                    "label": "paste",
+                    "labelDetails": { "description": "custom" },
+                    "textEdit": {
+                        "newText": "paste",
+                        "range": { "start": { "character": 32, "line": 5 }, "end": { "character": 37, "line": 5 } }
+                    },
+                    "kind": 2
+                }
+            ])
+        );
+
+        let resp = send_complete_request(&client_connection, script.clone(), 6, 14);
+        assert_json_include!(
+            actual: result_from_message(resp),
+            expected: serde_json::json!([
+                {
+                    "label": "null_device",
+                    "labelDetails": { "description": "variable" },
+                    "textEdit": {
+                        "newText": "null_device",
+                        "range": { "start": { "character": 8, "line": 6 }, "end": { "character": 14, "line": 6 } }
+                    },
+                    "kind": 6 // variable kind
+                }
+            ])
+        );
+
+        let resp = send_complete_request(&client_connection, script, 7, 13);
+        assert_json_include!(
+            actual: result_from_message(resp),
+            expected: serde_json::json!([
+                {
+                    "label": "foo",
+                    "labelDetails": { "description": "variable" },
+                    "textEdit": {
+                        "newText": "foo",
+                        "range": { "start": { "character": 11, "line": 7 }, "end": { "character": 14, "line": 7 } }
+                    },
+                    "kind": 6 // variable kind
+                }
+            ])
+        );
+    }
 }

crates/nu-lsp/src/lib.rs

@@ -440,6 +440,7 @@ mod tests {
         TextDocumentPositionParams, WorkDoneProgressParams,
     };
     use nu_protocol::{debugger::WithoutDebug, engine::Stack, PipelineData, ShellError, Value};
+    use nu_std::load_standard_library;
     use std::sync::mpsc::{self, Receiver};
     use std::time::Duration;
 
@@ -455,6 +456,7 @@ mod tests {
         let engine_state = nu_cmd_lang::create_default_context();
         let mut engine_state = nu_command::add_shell_command_context(engine_state);
         engine_state.generate_nu_constant();
+        assert!(load_standard_library(&mut engine_state).is_ok());
         let cwd = std::env::current_dir().expect("Could not get current working directory.");
         engine_state.add_env_var(
             "PWD".into(),

tests/fixtures/lsp/completion/use.nu

@@ -0,0 +1,8 @@
+export module "🤔🐘" {
+  export const foo = "🤔🐘";
+}
+
+export use std-rf
+export use std-rfc/clip [ copy, paste ]
+use std null_d
+use 🤔🐘 [ foo, ]