fix(formatter): handle this.b and super.b like foo.b (#28200)

For consistency.

crates/oxc_formatter/DIVERGENCES.md

@@ -1200,3 +1200,39 @@ Prettier moves it before the object for `.b`, and after the `.` for `.#b`; both
 A binary-like or conditional object of a member breaks its parens the same way for `.c`, `[c]` and `?.[c]`.
 Prettier does so for `.c` only, while an `await` / `as` object breaks them for `[c]` too.
 The computed property (`a[b + c]`) keeps its own layout.
+
+## single-level-member-no-break
+
+- Why: uniform-rule (same construct, same output: `foo.b`)
+- Pin: `tests/fixtures/js/member-expression/single-level-member-no-break.mjs`
+
+```js
+// input (printWidth: 80)
+foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+this.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+call(super.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX);
+
+// ours: the same as `foo.sql`
+foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+this.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+call(
+  super.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX,
+);
+
+// prettier
+foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+this
+  .sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+call(
+  super
+    .someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX,
+);
+```
+
+A single-level member is not split after its object when the object is a single word: an identifier, `this` or `super`.
+The break would leave the word alone on its line for a single property, which rarely fits either.
+A longer path (`a.b.c`) still breaks into a list of properties.
+
+Prettier keeps it only for an identifier object (prettier/prettier#1036, which has no case for `this` or `super`).
+Elsewhere it groups them with an identifier: all three count as a single word for a simple call argument,
+and `this` stays attached as a member chain head like a short identifier (`this.foo()` + break + `.bar()`, prettier/prettier#782).

crates/oxc_formatter/src/print/member_expression.rs

@@ -139,7 +139,18 @@ fn layout<'a>(
         _ => parent.is_member_expression(),
     };
 
-    if !is_nested && !object_is_cast_target && matches!(object, Expression::Identifier(_)) {
+    // A single-level member is not split when its object is a single word (an identifier, `this` or `super`):
+    // the break would leave the word alone on its line for a single property.
+    // A longer path (`a.b.c`) can break into a list of properties instead.
+    // NOTE: `import.meta` and `new.target` cannot break inside either, so the same reasoning applies to them.
+    // They are not included yet, and break like Prettier (`import.meta` + break + `.resolve(...)`).
+    if !is_nested
+        && !object_is_cast_target
+        && matches!(
+            object,
+            Expression::Identifier(_) | Expression::ThisExpression(_) | Expression::Super(_)
+        )
+    {
         return StaticMemberLayout::NoBreak;
     }
 

crates/oxc_formatter/tests/fixtures/js/member-expression/single-level-member-no-break.mjs

@@ -0,0 +1,20 @@
+// DIVERGENCES.md#single-level-member-no-break
+class A extends B {
+  #sql;
+  m() {
+    foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.#sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierKey}`;
+    call(foo.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXXX);
+    call(this.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXX);
+    call(super.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX);
+    require.resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // Not a single word, breaks like Prettier for now
+    call(new.target.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXX);
+    import.meta.resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // A longer path still breaks into a list of properties
+    call(this.someVeryLongPropertyNameXXXXXXXXXXXXXXXXXXXXXXXXXXXX.anotherVeryLongPropertyNameXXXXXXXXXXXXX);
+  }
+}

crates/oxc_formatter/tests/fixtures/js/member-expression/single-level-member-no-break.mjs.snap

@@ -0,0 +1,101 @@
+---
+source: crates/oxc_formatter/tests/fixtures/mod.rs
+---
+==================== Input ====================
+// DIVERGENCES.md#single-level-member-no-break
+class A extends B {
+  #sql;
+  m() {
+    foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.#sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierKey}`;
+    call(foo.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXXX);
+    call(this.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXX);
+    call(super.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX);
+    require.resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // Not a single word, breaks like Prettier for now
+    call(new.target.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXX);
+    import.meta.resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // A longer path still breaks into a list of properties
+    call(this.someVeryLongPropertyNameXXXXXXXXXXXXXXXXXXXXXXXXXXXX.anotherVeryLongPropertyNameXXXXXXXXXXXXX);
+  }
+}
+
+==================== Output ====================
+------------------
+{ printWidth: 80 }
+------------------
+// DIVERGENCES.md#single-level-member-no-break
+class A extends B {
+  #sql;
+  m() {
+    foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.#sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierKey}`;
+    call(
+      foo.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXXX,
+    );
+    call(
+      this.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXX,
+    );
+    call(
+      super.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX,
+    );
+    require.resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // Not a single word, breaks like Prettier for now
+    call(
+      new.target
+        .someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXX,
+    );
+    import.meta
+      .resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // A longer path still breaks into a list of properties
+    call(
+      this.someVeryLongPropertyNameXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+        .anotherVeryLongPropertyNameXXXXXXXXXXXXX,
+    );
+  }
+}
+
+-------------------
+{ printWidth: 100 }
+-------------------
+// DIVERGENCES.md#single-level-member-no-break
+class A extends B {
+  #sql;
+  m() {
+    foo.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierName}`;
+    this.#sql`DELETE FROM some_table_with_a_long_name WHERE some_column_name = ${someIdentifierKey}`;
+    call(
+      foo.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXXX,
+    );
+    call(
+      this.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXXX,
+    );
+    call(
+      super.someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXXXXXXX,
+    );
+    require.resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // Not a single word, breaks like Prettier for now
+    call(
+      new.target
+        .someVeryLongPropertyNameThatDoesNotFitOnTheLineEvenAfterBreakingXXXXXXXXXXXXXXXXXXXX,
+    );
+    import.meta
+      .resolve("./a/long/long/long/long/long/long/long/long/long/long/long/long/path/to/module");
+
+    // A longer path still breaks into a list of properties
+    call(
+      this.someVeryLongPropertyNameXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+        .anotherVeryLongPropertyNameXXXXXXXXXXXXX,
+    );
+  }
+}
+
+===================== End =====================

tasks/track_memory_allocations/allocs_formatter.yaml

@@ -16,9 +16,9 @@ App.tsx:
   sys deallocs: 5176
   sys alloc bytes: 1130046 # 1.13 MB
   sys peak growth: 435478 # 435.48 kB
-  arena allocs: 11512
-  arena reallocs: 364
-  arena size: 7117368 # 7.12 MB
+  arena allocs: 11511
+  arena reallocs: 362
+  arena size: 7086616 # 7.09 MB
 
 RadixUIAdoptionSection.jsx:
   file size: 2520 # 2.52 kB
@@ -38,9 +38,9 @@ pdf.mjs:
   sys deallocs: 9754
   sys alloc bytes: 2384856 # 2.38 MB
   sys peak growth: 1156488 # 1.16 MB
-  arena allocs: 21673
-  arena reallocs: 446
-  arena size: 11090656 # 11.09 MB
+  arena allocs: 21652
+  arena reallocs: 402
+  arena size: 11048480 # 11.05 MB
 
 antd.js:
   file size: 6686316 # 6.69 MB
@@ -51,7 +51,7 @@ antd.js:
   sys peak growth: 13710144 # 13.71 MB
   arena allocs: 120676
   arena reallocs: 1889
-  arena size: 114800840 # 114.80 MB
+  arena size: 114754760 # 114.75 MB
 
 binder.ts:
   file size: 193077 # 193.08 kB
@@ -71,6 +71,6 @@ kitchen-sink.tsx:
   sys deallocs: 12609
   sys alloc bytes: 3737938 # 3.74 MB
   sys peak growth: 1491884 # 1.49 MB
-  arena allocs: 30688
-  arena reallocs: 1043
-  arena size: 14615800 # 14.62 MB
+  arena allocs: 30654
+  arena reallocs: 975
+  arena size: 14595272 # 14.60 MB