JavaScript: Fix formatting on long named exports (#6446)

* Modify to put specific export inline

* Add tests

* Fix tests

* Modify to support default exports

* Update CHANGELOG.unreleased.md

* Modify to refactor

* Add pr link

* Modify to rename "content" -> "printed"

* Modify to define canBreak helpter

* Fix from linter

* Update CHANGELOG.unreleased.md

* Add tests

CHANGELOG.unreleased.md

@@ -581,6 +581,23 @@ Previously, Prettier formatted parens wrap binary expressions within call expres
 )();
 ```
 
+#### JavaScript: Fix formatting on long named exports ([#6446] by [@sosukesuzuki])
+
+Previously, Prettier formatted long named exports differently than named imports.
+
+```js
+// Input
+export { fooooooooooooooooooooooooooooooooooooooooooooooooo } from "fooooooooooooooooooooooooooooo";
+
+// Prettier (stable)
+export {
+  fooooooooooooooooooooooooooooooooooooooooooooooooo
+} from "fooooooooooooooooooooooooooooo";
+
+// Prettier (master)
+export { fooooooooooooooooooooooooooooooooooooooooooooooooo } from "fooooooooooooooooooooooooooooo";
+```
+
 [#5910]: https://github.com/prettier/prettier/pull/5910
 [#6186]: https://github.com/prettier/prettier/pull/6186
 [#6206]: https://github.com/prettier/prettier/pull/6206
@@ -601,6 +618,7 @@ Previously, Prettier formatted parens wrap binary expressions within call expres
 [#6411]: https://github.com/prettier/prettier/pull/6411
 [#6438]: https://github.com/prettier/prettier/pull/6411
 [#6441]: https://github.com/prettier/prettier/pull/6441
+[#6446]: https://github.com/prettier/prettier/pull/6446
 [@duailibe]: https://github.com/duailibe
 [@gavinjoyce]: https://github.com/gavinjoyce
 [@sosukesuzuki]: https://github.com/sosukesuzuki

src/language-js/printer-estree.js

@@ -4598,28 +4598,46 @@ function printExportDeclaration(path, options, print) {
         defaultSpecifiers.length !== 0 &&
         (namespaceSpecifiers.length !== 0 || specifiers.length !== 0);
 
+      const canBreak =
+        specifiers.length > 1 ||
+        defaultSpecifiers.length > 0 ||
+        (decl.specifiers && decl.specifiers.some(node => node.comments));
+
+      let printed = "";
+      if (specifiers.length !== 0) {
+        if (canBreak) {
+          printed = group(
+            concat([
+              "{",
+              indent(
+                concat([
+                  options.bracketSpacing ? line : softline,
+                  join(concat([",", line]), specifiers)
+                ])
+              ),
+              ifBreak(shouldPrintComma(options) ? "," : ""),
+              options.bracketSpacing ? line : softline,
+              "}"
+            ])
+          );
+        } else {
+          printed = concat([
+            "{",
+            options.bracketSpacing ? " " : "",
+            concat(specifiers),
+            options.bracketSpacing ? " " : "",
+            "}"
+          ]);
+        }
+      }
+
       parts.push(
         decl.exportKind === "type" ? "type " : "",
         concat(defaultSpecifiers),
         concat([isDefaultFollowed ? ", " : ""]),
         concat(namespaceSpecifiers),
         concat([isNamespaceFollowed ? ", " : ""]),
-        specifiers.length !== 0
-          ? group(
-              concat([
-                "{",
-                indent(
-                  concat([
-                    options.bracketSpacing ? line : softline,
-                    join(concat([",", line]), specifiers)
-                  ])
-                ),
-                ifBreak(shouldPrintComma(options) ? "," : ""),
-                options.bracketSpacing ? line : softline,
-                "}"
-              ])
-            )
-          : ""
+        printed
       );
     } else {
       parts.push("{}");

tests/export_extension/__snapshots__/jsfmt.spec.js.snap

@@ -11,6 +11,9 @@ export v from 'mod';
 export a, * as b from 'mod';
 export c, { foo } from 'mod';
 export * as d, { bar } from 'mod';
+export { fooooooooooooooooooooooooooooooooooooooooooooooooo } from "fooooooooooooooooooooooooooooo";
+export Bar, { barrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr } from "barrrrrrrrrrrrrrrrrrrrrrrrrrrr";
+export { foooooooooooooooooooooooooooooooooooooooooooooo, fooooooooooooooooooooooooooooooooooooooooooooooo  } from "fooooooooooooooooooooooooooooo";
 
 =====================================output=====================================
 export * as ns from "mod";
@@ -18,6 +21,14 @@ export v from "mod";
 export a, * as b from "mod";
 export c, { foo } from "mod";
 export * as d, { bar } from "mod";
+export { fooooooooooooooooooooooooooooooooooooooooooooooooo } from "fooooooooooooooooooooooooooooo";
+export Bar, {
+  barrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
+} from "barrrrrrrrrrrrrrrrrrrrrrrrrrrr";
+export {
+  foooooooooooooooooooooooooooooooooooooooooooooo,
+  fooooooooooooooooooooooooooooooooooooooooooooooo
+} from "fooooooooooooooooooooooooooooo";
 
 ================================================================================
 `;

tests/export_extension/export.js

@@ -3,3 +3,6 @@ export v from 'mod';
 export a, * as b from 'mod';
 export c, { foo } from 'mod';
 export * as d, { bar } from 'mod';
+export { fooooooooooooooooooooooooooooooooooooooooooooooooo } from "fooooooooooooooooooooooooooooo";
+export Bar, { barrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr } from "barrrrrrrrrrrrrrrrrrrrrrrrrrrr";
+export { foooooooooooooooooooooooooooooooooooooooooooooo, fooooooooooooooooooooooooooooooooooooooooooooooo  } from "fooooooooooooooooooooooooooooo";