From a8c033a49371a3b8f16b4d5d82ec1cbaf13ac93e Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Fri, 10 Oct 2025 15:52:40 +0800
Subject: [PATCH] Remove unnecessary `parts` (#18027)

---
 src/language-js/print/hook.js             | 24 ++++++++++-------------
 src/language-js/print/jsx.js              |  3 +--
 src/language-js/print/module.js           | 13 +++++-------
 src/language-js/print/template-literal.js |  6 ++----
 src/language-js/print/typescript.js       |  4 ++--
 5 files changed, 20 insertions(+), 30 deletions(-)

diff --git a/src/language-js/print/hook.js b/src/language-js/print/hook.js
index 8f23a342e..fd295056b 100644
--- a/src/language-js/print/hook.js
+++ b/src/language-js/print/hook.js
@@ -84,11 +84,8 @@ function isDeclareHookTypeAnnotation(path) {
 */
 function printHookTypeAnnotation(path, options, print) {
   const { node } = path;
-  const parts = [];
 
-  parts.push(isDeclareHookTypeAnnotation(path) ? "" : "hook ");
-
-  let parametersDoc = printFunctionParameters(
+  const parametersDoc = printFunctionParameters(
     path,
     options,
     print,
@@ -96,19 +93,18 @@ function printHookTypeAnnotation(path, options, print) {
     /* printTypeParams */ true,
   );
 
-  const returnTypeDoc = [];
-  returnTypeDoc.push(
+  const returnTypeDoc = [
     isDeclareHookTypeAnnotation(path) ? ": " : " => ",
     print("returnType"),
-  );
+  ];
 
-  if (shouldGroupFunctionParameters(node, returnTypeDoc)) {
-    parametersDoc = group(parametersDoc);
-  }
-
-  parts.push(parametersDoc, returnTypeDoc);
-
-  return group(parts);
+  return group([
+    isDeclareHookTypeAnnotation(path) ? "" : "hook ",
+    shouldGroupFunctionParameters(node, returnTypeDoc)
+      ? group(parametersDoc)
+      : parametersDoc,
+    returnTypeDoc,
+  ]);
 }
 
 export { printDeclareHook, printHook, printHookTypeAnnotation };
diff --git a/src/language-js/print/jsx.js b/src/language-js/print/jsx.js
index aeab8a792..3f3932b85 100644
--- a/src/language-js/print/jsx.js
+++ b/src/language-js/print/jsx.js
@@ -546,8 +546,7 @@ function shouldBreakJsxElement(path) {
 
 function printJsxAttribute(path, options, print) {
   const { node } = path;
-  const parts = [];
-  parts.push(print("name"));
+  const parts = [print("name")];
 
   if (node.value) {
     let res;
diff --git a/src/language-js/print/module.js b/src/language-js/print/module.js
index ebda9fe27..a97402537 100644
--- a/src/language-js/print/module.js
+++ b/src/language-js/print/module.js
@@ -148,14 +148,11 @@ function printModuleSource(path, options, print) {
     return "";
   }
 
-  /** @type{Doc[]} */
-  const parts = [];
-  if (shouldPrintSpecifiers(node, options)) {
-    parts.push(" from");
-  }
-  parts.push(" ", print("source"));
-
-  return parts;
+  return [
+    shouldPrintSpecifiers(node, options) ? " from" : "",
+    " ",
+    print("source"),
+  ];
 }
 
 function printModuleSpecifiers(path, options, print) {
diff --git a/src/language-js/print/template-literal.js b/src/language-js/print/template-literal.js
index ecebecc85..98a0a1c1a 100644
--- a/src/language-js/print/template-literal.js
+++ b/src/language-js/print/template-literal.js
@@ -177,7 +177,6 @@ function printJestEachTemplateLiteral(path, options, print) {
     options.__inJestEach = true;
     const expressions = path.map(print, "expressions");
     options.__inJestEach = false;
-    const parts = [];
     const stringifiedExpressions = expressions.map(
       (doc) =>
         "${" +
@@ -223,7 +222,7 @@ function printJestEachTemplateLiteral(path, options, print) {
       }
     }
 
-    parts.push(
+    return [
       lineSuffixBoundary,
       "`",
       indent([
@@ -245,8 +244,7 @@ function printJestEachTemplateLiteral(path, options, print) {
       ]),
       hardline,
       "`",
-    );
-    return parts;
+    ];
   }
 }
 
diff --git a/src/language-js/print/typescript.js b/src/language-js/print/typescript.js
index e85988867..f1a6ca9ce 100644
--- a/src/language-js/print/typescript.js
+++ b/src/language-js/print/typescript.js
@@ -71,8 +71,6 @@ function printTypescript(path, options, print) {
     return node.type.slice(2, -7).toLowerCase();
   }
 
-  const parts = [];
-
   switch (node.type) {
     case "TSThisType":
       return "this";
@@ -223,6 +221,7 @@ function printTypescript(path, options, print) {
       return printTypeScriptMappedType(path, options, print);
 
     case "TSMethodSignature": {
+      const parts = [];
       const kind = node.kind && node.kind !== "method" ? `${node.kind} ` : "";
       parts.push(
         printTypeScriptAccessibilityToken(node),
@@ -281,6 +280,7 @@ function printTypescript(path, options, print) {
     case "TSExternalModuleReference":
       return ["require(", print("expression"), ")"];
     case "TSModuleDeclaration": {
+      const parts = [];
       const { parent } = path;
       const parentIsDeclaration = parent.type === "TSModuleDeclaration";
       const bodyIsDeclaration = node.body?.type === "TSModuleDeclaration";