From d40da4a260d35d9f0ea8208c2cc77204f8d3e5f8 Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Thu, 15 Jan 2026 04:04:03 +0800
Subject: [PATCH] Merge `printHook` into `printFunction` (#18632)

---
 src/language-js/comments/handle-comments.js |  2 +-
 src/language-js/print/flow.js               |  9 ++---
 src/language-js/print/function.js           | 28 +++++++--------
 src/language-js/print/hook.js               | 40 +--------------------
 4 files changed, 18 insertions(+), 61 deletions(-)

diff --git a/src/language-js/comments/handle-comments.js b/src/language-js/comments/handle-comments.js
index b2c245c94..d9ef50790 100644
--- a/src/language-js/comments/handle-comments.js
+++ b/src/language-js/comments/handle-comments.js
@@ -664,7 +664,6 @@ function handleCommentInEmptyParens({ comment, enclosingNode, options }) {
 
   const functionNode =
     isRealFunctionLikeNode(enclosingNode) ||
-    enclosingNode.type === "HookDeclaration" ||
     enclosingNode.type === "HookTypeAnnotation"
       ? enclosingNode
       : enclosingNode.type === "MethodDefinition" ||
@@ -1256,6 +1255,7 @@ const isRealFunctionLikeNode = createTypeCheckFunction([
   "TSConstructorType",
   "TSFunctionType",
   "TSDeclareMethod",
+  "HookDeclaration",
 ]);
 
 const handleComments = {
diff --git a/src/language-js/print/flow.js b/src/language-js/print/flow.js
index c92bb8a69..380df9270 100644
--- a/src/language-js/print/flow.js
+++ b/src/language-js/print/flow.js
@@ -25,12 +25,9 @@ import {
   printEnumMember,
   printFlowEnumBody,
 } from "./enum.js";
+import { printFunction } from "./function.js";
 import { printFunctionType } from "./function-type.js";
-import {
-  printDeclareHook,
-  printHook,
-  printHookTypeAnnotation,
-} from "./hook.js";
+import { printDeclareHook, printHookTypeAnnotation } from "./hook.js";
 import { printIndexedAccessType } from "./indexed-access-type.js";
 import { printInferType } from "./infer-type.js";
 import { printIntersectionType } from "./intersection-type.js";
@@ -74,7 +71,7 @@ function printFlow(path, options, print) {
     case "ComponentTypeParameter":
       return printComponentTypeParameter(path, options, print);
     case "HookDeclaration":
-      return printHook(path, options, print);
+      return printFunction(path, options, print);
     case "DeclareHook":
       return printDeclareHook(path, options, print);
     case "HookTypeAnnotation":
diff --git a/src/language-js/print/function.js b/src/language-js/print/function.js
index ead2b8d1b..49f93db18 100644
--- a/src/language-js/print/function.js
+++ b/src/language-js/print/function.js
@@ -36,6 +36,7 @@ const isMethodValue = ({ node, key, parent }) =>
 /*
 - `FunctionDeclaration`
 - `FunctionExpression`
+- `HookDeclaration` (Flow)
 - `TSDeclareFunction`(TypeScript)
 */
 function printFunction(path, options, print, args) {
@@ -63,13 +64,6 @@ function printFunction(path, options, print, args) {
     }
   }
 
-  const parts = [
-    printDeclareToken(path),
-    node.async ? "async " : "",
-    `function${node.generator ? "*" : ""} `,
-    node.id ? print("id") : "",
-  ];
-
   const parametersDoc = printFunctionParameters(
     path,
     options,
@@ -82,7 +76,16 @@ function printFunction(path, options, print, args) {
     returnTypeDoc,
   );
 
-  parts.push(
+  const isFlowHookDeclaration = node.type === "HookDeclaration";
+  const keyword = isFlowHookDeclaration ? "hook" : "function";
+
+  return [
+    printDeclareToken(path),
+    node.async ? "async " : "",
+    keyword,
+    node.generator ? "*" : "",
+    " ",
+    node.id ? print("id") : "",
     print("typeParameters"),
     group([
       shouldGroupParameters ? group(parametersDoc) : parametersDoc,
@@ -90,13 +93,8 @@ function printFunction(path, options, print, args) {
     ]),
     node.body ? " " : "",
     print("body"),
-  );
-
-  if (options.semi && (node.declare || !node.body)) {
-    parts.push(";");
-  }
-
-  return parts;
+    options.semi && (node.declare || !node.body) ? ";" : "",
+  ];
 }
 
 /*
diff --git a/src/language-js/print/hook.js b/src/language-js/print/hook.js
index 24e4850f6..ba81917d6 100644
--- a/src/language-js/print/hook.js
+++ b/src/language-js/print/hook.js
@@ -1,5 +1,4 @@
 import { group } from "../../document/index.js";
-import { printReturnType } from "./function.js";
 import {
   printFunctionParameters,
   shouldGroupFunctionParameters,
@@ -11,43 +10,6 @@ import { printDeclareToken } from "./miscellaneous.js";
  * @import {Doc} from "../../document/index.js"
  */
 
-/*
-- `HookDeclaration` (Flow)
-*/
-function printHook(path, options, print) {
-  const { node } = path;
-
-  /** @type {Array<Doc>} */
-  const parts = ["hook"];
-  if (node.id) {
-    parts.push(" ", print("id"));
-  }
-
-  const parametersDoc = printFunctionParameters(
-    path,
-    options,
-    print,
-    /* shouldExpandArgument */ false,
-    /* shouldPrintTypeParameters*/ true,
-  );
-  const returnTypeDoc = printReturnType(path, print);
-  const shouldGroupParameters = shouldGroupFunctionParameters(
-    node,
-    returnTypeDoc,
-  );
-
-  parts.push(
-    group([
-      shouldGroupParameters ? group(parametersDoc) : parametersDoc,
-      returnTypeDoc,
-    ]),
-    node.body ? " " : "",
-    print("body"),
-  );
-
-  return parts;
-}
-
 /*
 - "DeclareHook"
 */
@@ -107,4 +69,4 @@ function printHookTypeAnnotation(path, options, print) {
   ]);
 }
 
-export { printDeclareHook, printHook, printHookTypeAnnotation };
+export { printDeclareHook, printHookTypeAnnotation };