Bump TypeScript to 5.6.3 (#72311)

### Why?

To unpin the TS version for testing added at #69889.

Closes NDX-287

---------

Co-authored-by: Sebastian "Sebbie" Silbermann <[email protected]>

Author: devjiwonchoi

package.json

@@ -114,7 +114,7 @@
     "@types/html-validator": "5.0.3",
     "@types/http-proxy": "1.17.3",
     "@types/jest": "29.5.5",
-    "@types/node": "20.12.3",
+    "@types/node": "20.17.6",
     "@types/node-fetch": "2.6.1",
     "@types/react": "npm:[email protected]",
     "@types/react-dom": "npm:[email protected]",
@@ -246,7 +246,7 @@
     "tree-kill": "1.2.2",
     "tsec": "0.2.1",
     "turbo": "2.1.2",
-    "typescript": "5.5.3",
+    "typescript": "5.6.3",
     "unfetch": "4.2.0",
     "wait-port": "0.2.2",
     "webpack": "5.96.1",
@@ -265,7 +265,7 @@
       "webpack": "5.96.1",
       "browserslist": "4.22.2",
       "caniuse-lite": "1.0.30001579",
-      "@types/node": "20.12.3",
+      "@types/node": "20.17.6",
       "@babel/core": "7.22.5",
       "@babel/parser": "7.22.5",
       "@babel/types": "7.22.5",

packages/next/package.json

@@ -319,7 +319,7 @@
     "text-table": "0.2.0",
     "timers-browserify": "2.0.12",
     "tty-browserify": "0.0.1",
-    "typescript": "5.5.3",
+    "typescript": "5.6.3",
     "ua-parser-js": "1.0.35",
     "unistore": "3.4.1",
     "util": "0.12.4",

packages/next/src/server/lib/lru-cache.ts

@@ -70,10 +70,12 @@ export class LRUCache<T> {
 
   private evictLeastRecentlyUsed(): void {
     const lruKey = this.cache.keys().next().value
-    const lruSize = this.sizes.get(lruKey) || 0
-    this.totalSize -= lruSize
-    this.cache.delete(lruKey)
-    this.sizes.delete(lruKey)
+    if (lruKey !== undefined) {
+      const lruSize = this.sizes.get(lruKey) || 0
+      this.totalSize -= lruSize
+      this.cache.delete(lruKey)
+      this.sizes.delete(lruKey)
+    }
   }
 
   reset() {

packages/next/src/server/lib/mock-request.ts

@@ -432,6 +432,10 @@ export class MockedResponse extends Stream.Writable implements ServerResponse {
   public addTrailers(): void {
     throw new Error('Method not implemented.')
   }
+
+  public setHeaders(): this {
+    throw new Error('Method not implemented.')
+  }
 }
 
 interface RequestResponseMockerOptions {

packages/next/src/server/web/spec-extension/adapters/headers.ts

@@ -197,7 +197,7 @@ export class HeadersAdapter extends Headers {
     }
   }
 
-  public *entries(): IterableIterator<[string, string]> {
+  public *entries(): HeadersIterator<[string, string]> {
     for (const key of Object.keys(this.headers)) {
       const name = key.toLowerCase()
       // We assert here that this is a string because we got it from the
@@ -208,14 +208,14 @@ export class HeadersAdapter extends Headers {
     }
   }
 
-  public *keys(): IterableIterator<string> {
+  public *keys(): HeadersIterator<string> {
     for (const key of Object.keys(this.headers)) {
       const name = key.toLowerCase()
       yield name
     }
   }
 
-  public *values(): IterableIterator<string> {
+  public *values(): HeadersIterator<string> {
     for (const key of Object.keys(this.headers)) {
       // We assert here that this is a string because we got it from the
       // Object.keys() call above.
@@ -225,7 +225,7 @@ export class HeadersAdapter extends Headers {
     }
   }
 
-  public [Symbol.iterator](): IterableIterator<[string, string]> {
+  public [Symbol.iterator](): HeadersIterator<[string, string]> {
     return this.entries()
   }
 }

packages/next/types/$$compiled.internal.d.ts

@@ -412,7 +412,7 @@ declare module 'next/dist/compiled/amphtml-validator' {
 }
 
 declare module 'next/dist/compiled/superstruct' {
-  import m from 'superstruct'
+  import * as m from 'superstruct'
   export = m
 }
 declare module 'next/dist/compiled/async-retry'
@@ -544,7 +544,7 @@ declare module 'next/dist/compiled/picomatch' {
   export = m
 }
 declare module 'next/dist/compiled/nanoid/index.cjs' {
-  import m from 'nanoid'
+  import * as m from 'nanoid'
   export = m
 }
 declare module 'next/dist/compiled/ora' {
@@ -590,7 +590,7 @@ declare module 'next/dist/compiled/tar' {
 }
 
 declare module 'next/dist/compiled/terser' {
-  import m from 'terser'
+  import * as m from 'terser'
   export = m
 }
 declare module 'next/dist/compiled/semver' {
@@ -619,7 +619,7 @@ declare module 'next/dist/compiled/unistore' {
   export = m
 }
 declare module 'next/dist/compiled/web-vitals' {
-  import m from 'web-vitals'
+  import * as m from 'web-vitals'
   export = m
 }
 declare module 'next/dist/compiled/web-vitals-attribution' {}