fix: add return types of void function

src/adapter/aws-lambda/handler.ts

@@ -95,7 +95,7 @@ const getRequestContext = (
 const streamToNodeStream = async (
   reader: ReadableStreamDefaultReader<Uint8Array>,
   writer: NodeJS.WritableStream
-) => {
+): Promise<void> => {
   let readResult = await reader.read()
   while (!readResult.done) {
     writer.write(readResult.value)

src/context.ts

@@ -395,7 +395,7 @@ export class Context<
    * ```
    * @see https://hono.dev/api/context#render-setrenderer
    */
-  setRenderer = (renderer: Renderer) => {
+  setRenderer = (renderer: Renderer): void => {
     this.renderer = renderer
   }
 

src/helper/dev/index.ts

@@ -36,7 +36,7 @@ export const inspectRoutes = <E extends Env>(hono: Hono<E>): RouteData[] => {
   })
 }
 
-export const showRoutes = <E extends Env>(hono: Hono<E>, opts?: ShowRoutesOptions) => {
+export const showRoutes = <E extends Env>(hono: Hono<E>, opts?: ShowRoutesOptions): void => {
   const colorEnabled = opts?.colorize ?? getColorEnabled()
   const routeData: Record<string, RouteData[]> = {}
   let maxMethodLength = 0

src/helper/streaming/sse.ts

@@ -39,7 +39,7 @@ const run = async (
   stream: SSEStreamingApi,
   cb: (stream: SSEStreamingApi) => Promise<void>,
   onError?: (e: Error, stream: SSEStreamingApi) => Promise<void>
-) => {
+): Promise<void> => {
   try {
     await cb(stream)
   } catch (e) {

src/hono-base.ts

@@ -426,7 +426,7 @@ class Hono<E extends Env = Env, S extends Schema = {}, BasePath extends string =
    * @see https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API
    * @see https://developers.cloudflare.com/workers/reference/migrate-to-module-workers/
    */
-  fire = () => {
+  fire = (): void => {
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     addEventListener('fetch', (event: FetchEventLike): void => {

src/jsx/dom/render.ts

@@ -114,7 +114,11 @@ const toAttributeName = (element: SupportedElement, key: string): string =>
     ? key.replace(/([A-Z])/g, '-$1').toLowerCase()
     : key
 
-const applyProps = (container: SupportedElement, attributes: Props, oldAttributes?: Props) => {
+const applyProps = (
+  container: SupportedElement,
+  attributes: Props,
+  oldAttributes?: Props
+): void => {
   attributes ||= {}
   for (const [key, value] of Object.entries(attributes)) {
     if (!skipProps.has(key) && (!oldAttributes || oldAttributes[key] !== value)) {
@@ -235,7 +239,7 @@ const getNextChildren = (
   nextChildren: Node[],
   childrenToRemove: Node[],
   callbacks: EffectData[]
-) => {
+): void => {
   childrenToRemove.push(...node.vR)
   if (typeof node.tag === 'function') {
     node[DOM_STASH][1][STASH_EFFECT]?.forEach((data: EffectData) => callbacks.push(data))
@@ -276,7 +280,7 @@ const findInsertBefore = (node: Node | undefined): SupportedElement | Text | nul
   return findInsertBefore(node.nN)
 }
 
-const removeNode = (node: Node) => {
+const removeNode = (node: Node): void => {
   if (!isNodeString(node)) {
     node[DOM_STASH]?.[1][STASH_EFFECT]?.forEach((data: EffectData) => data[2]?.())
 
@@ -298,12 +302,12 @@ const removeNode = (node: Node) => {
   }
 }
 
-const apply = (node: NodeObject, container: Container) => {
+const apply = (node: NodeObject, container: Container): void => {
   node.c = container
   applyNodeObject(node, container)
 }
 
-const applyNode = (node: Node, container: Container) => {
+const applyNode = (node: Node, container: Container): void => {
   if (isNodeString(node)) {
     container.textContent = node.t
   } else {
@@ -328,7 +332,7 @@ const findChildNodeIndex = (
   return
 }
 
-const applyNodeObject = (node: NodeObject, container: Container) => {
+const applyNodeObject = (node: NodeObject, container: Container): void => {
   const next: Node[] = []
   const remove: Node[] = []
   const callbacks: EffectData[] = []
@@ -523,14 +527,14 @@ export const buildNode = (node: Child): Node | undefined => {
   }
 }
 
-const replaceContainer = (node: NodeObject, from: DocumentFragment, to: Container) => {
+const replaceContainer = (node: NodeObject, from: DocumentFragment, to: Container): void => {
   if (node.c === from) {
     node.c = to
     node.vC.forEach((child) => replaceContainer(child as NodeObject, from, to))
   }
 }
 
-const updateSync = (context: Context, node: NodeObject) => {
+const updateSync = (context: Context, node: NodeObject): void => {
   node[DOM_STASH][2]?.forEach(([c, v]) => {
     c.values.push(v)
   })
@@ -590,7 +594,7 @@ export const update = async (
   return promise
 }
 
-export const renderNode = (node: NodeObject, container: Container) => {
+export const renderNode = (node: NodeObject, container: Container): void => {
   const context: Context = []
   ;(context as Context)[4] = true // start top level render
   build(context, node, undefined)
@@ -602,12 +606,12 @@ export const renderNode = (node: NodeObject, container: Container) => {
   container.replaceChildren(fragment)
 }
 
-export const render = (jsxNode: Child, container: Container) => {
+export const render = (jsxNode: Child, container: Container): void => {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   renderNode(buildNode({ tag: '', props: { children: jsxNode } } as any) as NodeObject, container)
 }
 
-export const flushSync = (callback: () => void) => {
+export const flushSync = (callback: () => void): void => {
   const set = new Set<NodeObject>()
   currentUpdateSets.push(set)
   callback()