Remove space in empty object type (#19583)

changelog_unreleased/typescript/19583.md

@@ -0,0 +1,20 @@
+#### Remove space in comment-only object type (#19583 by @fisker)
+
+<!-- prettier-ignore -->
+```tsx
+// Input
+var foo = {
+  /* comment */
+};
+type Foo = {
+  /* comment */
+};
+
+// Prettier stable
+var foo = {/* comment */};
+type Foo = { /* comment */ };
+
+// Prettier main
+var foo = {/* comment */};
+type Foo = {/* comment */};
+```

src/language-js/print/class-body.js

@@ -39,10 +39,12 @@ function printClassBody(path, options, print) {
 
   const [openingBrace, closingBrace] =
     isFlowTypeAnnotation && node.exact ? ["{|", "|}"] : "{}";
+  let isEmpty = true;
   let firstMember;
 
   iterateClassMembersPath(path, ({ node, next, isLast }) => {
     firstMember ??= node;
+    isEmpty &&= false;
     parts.push(print());
 
     if (!isFlowRecordDeclaration && isObjectType && isFlowTypeAnnotation) {
@@ -83,6 +85,7 @@ function printClassBody(path, options, print) {
 
   // TODO: this part can unify with the similar part in `printObject`
   if (node.type === "ObjectTypeAnnotation" && node.inexact) {
+    isEmpty &&= false;
     let printed;
     if (hasComment(node, CommentCheckFlags.Dangling)) {
       const hasLineComments = hasComment(node, CommentCheckFlags.Line);
@@ -114,7 +117,8 @@ function printClassBody(path, options, print) {
     if (parts.length === 0) {
       content = openingBrace + closingBrace;
     } else {
-      const spacing = options.bracketSpacing ? line : softline;
+      const spacing =
+        !options.bracketSpacing || (isEmpty && !shouldBreak) ? softline : line;
       content = [
         openingBrace,
         indent([spacing, ...parts]),

tests/format/flow/object-inexact/comments/__snapshots__/format.test.js.snap

@@ -43,16 +43,16 @@ T6 = {/* comment */ // comment
 };
 
 =====================================output=====================================
-type T1 = {| /* comment */ |};
-type T12 = { /* comment */ };
+type T1 = {|/* comment */|};
+type T12 = {/* comment */};
 T1 = {/* comment */};
 
-type T2 = {| /* comment */ |};
-type T22 = { /* comment */ };
+type T2 = {|/* comment */|};
+type T22 = {/* comment */};
 T2 = {/* comment */};
 
-type T3 = {| /* comment */ |};
-type T32 = { /* comment */ };
+type T3 = {|/* comment */|};
+type T32 = {/* comment */};
 T3 = {/* comment */};
 
 type T4 = {|

tests/format/flow/object-type/empty/__snapshots__/format.test.js.snap

@@ -0,0 +1,97 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`empty.js - {"bracketSpacing":false} format 1`] = `
+====================================options=====================================
+bracketSpacing: false
+parsers: ["flow"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+type O23 = {...};
+type O24 = {/*c*/ ...};
+type O31 = {||};
+type O32 = {|/*c*/|};
+// type O33 = {|...|};
+// type O34 = {|/*c*/ ...|};
+interface I21 {}
+interface I22 {/*c*/}
+
+=====================================output=====================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+type O23 = {...};
+type O24 = {/*c*/ ...};
+type O31 = {||};
+type O32 = {|/*c*/|};
+// type O33 = {|...|};
+// type O34 = {|/*c*/ ...|};
+interface I21 {}
+interface I22 {
+  /*c*/
+}
+
+================================================================================
+`;
+
+exports[`empty.js - {"bracketSpacing":true} format 1`] = `
+====================================options=====================================
+bracketSpacing: true
+parsers: ["flow"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+type O23 = {...};
+type O24 = {/*c*/ ...};
+type O31 = {||};
+type O32 = {|/*c*/|};
+// type O33 = {|...|};
+// type O34 = {|/*c*/ ...|};
+interface I21 {}
+interface I22 {/*c*/}
+
+=====================================output=====================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+type O23 = { ... };
+type O24 = { /*c*/ ... };
+type O31 = {||};
+type O32 = {|/*c*/|};
+// type O33 = {|...|};
+// type O34 = {|/*c*/ ...|};
+interface I21 {}
+interface I22 {
+  /*c*/
+}
+
+================================================================================
+`;

tests/format/flow/object-type/empty/empty.js

@@ -0,0 +1,17 @@
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+type O23 = {...};
+type O24 = {/*c*/ ...};
+type O31 = {||};
+type O32 = {|/*c*/|};
+// type O33 = {|...|};
+// type O34 = {|/*c*/ ...|};
+interface I21 {}
+interface I22 {/*c*/}

tests/format/flow/object-type/empty/format.test.js

@@ -0,0 +1,2 @@
+runFormatTest(import.meta, ["flow"], { bracketSpacing: true });
+runFormatTest(import.meta, ["flow"], { bracketSpacing: false });

tests/format/typescript/class-and-interface/empty/__snapshots__/format.test.js.snap

@@ -63,10 +63,10 @@ type T2 = {
 type T3 = {
   //comment
 };
-type T4 = { /*comment*/ };
-type T5 = { /*comment*/ };
-type T6 = { /*comment*/ };
-type T7 = { /*comment*/ };
+type T4 = {/*comment*/};
+type T5 = {/*comment*/};
+type T6 = {/*comment*/};
+type T7 = {/*comment*/};
 
 ================================================================================
 `;

tests/format/typescript/object-type/empty/__snapshots__/format.test.js.snap

@@ -0,0 +1,73 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`empty.ts - {"bracketSpacing":false} format 1`] = `
+====================================options=====================================
+bracketSpacing: false
+parsers: ["typescript"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+interface I21 {}
+interface I22 {/*c*/}
+
+=====================================output=====================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+interface I21 {}
+interface I22 {
+  /*c*/
+}
+
+================================================================================
+`;
+
+exports[`empty.ts - {"bracketSpacing":true} format 1`] = `
+====================================options=====================================
+bracketSpacing: true
+parsers: ["typescript"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+interface I21 {}
+interface I22 {/*c*/}
+
+=====================================output=====================================
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+interface I21 {}
+interface I22 {
+  /*c*/
+}
+
+================================================================================
+`;

tests/format/typescript/object-type/empty/empty.ts

@@ -0,0 +1,11 @@
+a = [];
+a = [/*c*/];
+type A11 = [];
+type A12 = [/*c*/];
+
+o = {};
+o = {/*c*/};
+type O21 = {};
+type O22 = {/*c*/};
+interface I21 {}
+interface I22 {/*c*/}

tests/format/typescript/object-type/empty/format.test.js

@@ -0,0 +1,2 @@
+runFormatTest(import.meta, ["typescript"], { bracketSpacing: true });
+runFormatTest(import.meta, ["typescript"], { bracketSpacing: false });