feat(formatter/sort-imports): Implement options.ignoreCase: bool

crates/oxc_formatter/examples/sort_imports.rs

@@ -18,9 +18,15 @@ fn main() -> Result<(), String> {
     let partition_by_comment = args.contains("--partition_by_comment");
     let sort_side_effects = args.contains("--sort_side_effects");
     let order = args.opt_value_from_str("--order").unwrap_or(None).unwrap_or(SortOrder::Asc);
+    let ignore_case = !args.contains("--no_ignore_case");
 
-    let sort_imports_options =
-        SortImports { order, partition_by_newline, partition_by_comment, sort_side_effects };
+    let sort_imports_options = SortImports {
+        order,
+        partition_by_newline,
+        partition_by_comment,
+        sort_side_effects,
+        ignore_case,
+    };
 
     // Read source file
     let path = Path::new(&name);

crates/oxc_formatter/src/ir_transform/sort_imports.rs

@@ -1,5 +1,7 @@
 use std::ops::Range;
 
+use cow_utils::CowUtils;
+
 use crate::{
     JsLabels,
     formatter::format_element::{
@@ -434,7 +436,7 @@ impl IntoIterator for ImportUnits {
 
 impl ImportUnits {
     // TODO: Sort based on `options.groups`, `options.type`, etc...
-    // TODO: Consider `options.ignore_case`, `special_characters`, removing `?raw`, etc...
+    // TODO: Consider `special_characters`, removing `?raw`, etc...
     fn sort_imports(&mut self, elements: &[FormatElement], options: options::SortImports) {
         let imports_len = self.0.len();
 
@@ -458,7 +460,15 @@ impl ImportUnits {
 
         // Sort indices by comparing their corresponding import sources
         sortable_indices.sort_by(|&a, &b| {
-            let ord = self.0[a].get_source(elements).cmp(self.0[b].get_source(elements));
+            let source_a = self.0[a].get_source(elements);
+            let source_b = self.0[b].get_source(elements);
+
+            let ord = if options.ignore_case {
+                source_a.cow_to_lowercase().cmp(&source_b.cow_to_lowercase())
+            } else {
+                source_a.cmp(source_b)
+            };
+
             if options.order.is_desc() { ord.reverse() } else { ord }
         });
 

crates/oxc_formatter/src/options.rs

@@ -917,16 +917,35 @@ impl fmt::Display for OperatorPosition {
 
 // ---
 
-#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct SortImports {
-    /// Sort order (asc or desc).
-    pub order: SortOrder,
     /// Partition imports by newlines.
+    /// Default is `false`.
     pub partition_by_newline: bool,
     /// Partition imports by comments.
+    /// Default is `false`.
     pub partition_by_comment: bool,
     /// Sort side effects imports.
+    /// Default is `false`.
     pub sort_side_effects: bool,
+    /// Sort order (asc or desc).
+    /// Default is ascending (asc).
+    pub order: SortOrder,
+    /// Ignore case when sorting.
+    /// Default is `true`.
+    pub ignore_case: bool,
+}
+
+impl Default for SortImports {
+    fn default() -> Self {
+        Self {
+            partition_by_newline: false,
+            partition_by_comment: false,
+            sort_side_effects: false,
+            order: SortOrder::default(),
+            ignore_case: true,
+        }
+    }
 }
 
 #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]

crates/oxc_formatter/tests/ir_transform/sort_imports.rs

@@ -704,6 +704,24 @@ import { log } from "./log";
 import { log10 } from "./log10";
 import { log1p } from "./log1p";
 import { log2 } from "./log2";
+"#,
+    );
+    assert_format(
+        r#"
+import { log } from "./log";
+import { log10 } from "./log10";
+import { log1p } from "./log1p";
+import { log2 } from "./log2";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports::default()),
+            ..Default::default()
+        },
+        r#"
+import { log } from "./log";
+import { log10 } from "./log10";
+import { log1p } from "./log1p";
+import { log2 } from "./log2";
 "#,
     );
 }
@@ -818,3 +836,117 @@ import "c";
 "#,
     );
 }
+
+// ---
+
+#[test]
+fn should_sort_with_ignore_case_option() {
+    // Case-insensitive (ignore_case: true by default)
+    assert_format(
+        r#"
+import { A } from "a";
+import { b } from "B";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports::default()),
+            ..Default::default()
+        },
+        r#"
+import { A } from "a";
+import { b } from "B";
+"#,
+    );
+    // "a" and "A" are treated as the same, maintaining original order
+    assert_format(
+        r#"
+import x from "A";
+import y from "a";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports::default()),
+            ..Default::default()
+        },
+        r#"
+import x from "A";
+import y from "a";
+"#,
+    );
+    // Mixed case sorting with ignore_case: true
+    assert_format(
+        r#"
+import { z } from "Z";
+import { b } from "B";
+import { a } from "a";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports {
+                ignore_case: true,
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        r#"
+import { a } from "a";
+import { b } from "B";
+import { z } from "Z";
+"#,
+    );
+    // Case-sensitive, lowercase comes after uppercase in ASCII
+    assert_format(
+        r#"
+import { a } from "a";
+import { B } from "B";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports {
+                ignore_case: false,
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        r#"
+import { B } from "B";
+import { a } from "a";
+"#,
+    );
+    // Capital A vs lowercase a
+    assert_format(
+        r#"
+import x from "a";
+import y from "A";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports {
+                ignore_case: false,
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        r#"
+import y from "A";
+import x from "a";
+"#,
+    );
+    // Multiple imports with mixed case
+    assert_format(
+        r#"
+import { z } from "z";
+import { B } from "B";
+import { a } from "a";
+import { Z } from "Z";
+"#,
+        &FormatOptions {
+            experimental_sort_imports: Some(SortImports {
+                ignore_case: false,
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        r#"
+import { B } from "B";
+import { Z } from "Z";
+import { a } from "a";
+import { z } from "z";
+"#,
+    );
+}