Update to TypeScript 5.9 and change return types from Uint8Array to Uint8Array<ArrayBuffer>

package.json

@@ -43,7 +43,7 @@
     "@types/node": "^24.1.0",
     "jest": "^29.7.0",
     "turbo": "^2.5.5",
-    "typescript": "~5.6.3"
+    "typescript": "^5.9.2"
   },
   "//": "avoid hoisting of @typescript/vfs, see packages/protoplugin/src/transpile.ts",
   "dependencies": {

packages/bundle-size/README.md

@@ -16,11 +16,11 @@ usually do. We repeat this for an increasing number of files.
 
 | code generator      | files | bundle size |  minified | compressed |
 | ------------------- | ----: | ----------: | --------: | ---------: |
-| Protobuf-ES         |     1 |   132,159 b |  68,489 b |   15,756 b |
-| Protobuf-ES         |     4 |   134,348 b |  69,996 b |   16,428 b |
-| Protobuf-ES         |     8 |   137,110 b |  71,767 b |   16,932 b |
-| Protobuf-ES         |    16 |   147,560 b |  79,748 b |   19,320 b |
-| Protobuf-ES         |    32 |   175,351 b | 101,766 b |   24,771 b |
+| Protobuf-ES         |     1 |   132,341 b |  68,489 b |   15,756 b |
+| Protobuf-ES         |     4 |   134,530 b |  69,996 b |   16,428 b |
+| Protobuf-ES         |     8 |   137,292 b |  71,767 b |   16,932 b |
+| Protobuf-ES         |    16 |   147,742 b |  79,748 b |   19,320 b |
+| Protobuf-ES         |    32 |   175,533 b | 101,766 b |   24,771 b |
 | protobuf-javascript |     1 |   104,048 b |  70,320 b |   15,540 b |
 | protobuf-javascript |     4 |   130,537 b |  85,672 b |   16,956 b |
 | protobuf-javascript |     8 |   152,429 b |  98,044 b |   18,138 b |

packages/protobuf-conformance/src/conformance.ts

@@ -180,7 +180,10 @@ async function* readMessages<Desc extends DescMessage>(
   messageDesc: Desc,
 ): AsyncIterable<MessageShape<Desc>> {
   // append chunk to buffer, returning updated buffer
-  function append(buffer: Uint8Array, chunk: Uint8Array): Uint8Array {
+  function append(
+    buffer: Uint8Array<ArrayBuffer>,
+    chunk: Uint8Array,
+  ): Uint8Array<ArrayBuffer> {
     const n = new Uint8Array(buffer.byteLength + chunk.byteLength);
     n.set(buffer);
     n.set(chunk, buffer.byteLength);

packages/protobuf-test/src/wire/text-encoding.test.ts

@@ -100,7 +100,7 @@ describe("configureTextEncoding()", () => {
     configureTextEncoding({
       checkUtf8: backup.checkUtf8,
       decodeUtf8: backup.decodeUtf8,
-      encodeUtf8(text: string): Uint8Array {
+      encodeUtf8(text: string) {
         arg = text;
         return new Uint8Array(10);
       },

packages/protobuf/src/to-binary.ts

@@ -54,7 +54,7 @@ export function toBinary<Desc extends DescMessage>(
   schema: Desc,
   message: MessageShape<Desc>,
   options?: Partial<BinaryWriteOptions>,
-): Uint8Array {
+): Uint8Array<ArrayBuffer> {
   return writeFields(
     new BinaryWriter(),
     makeWriteOptions(options),

packages/protobuf/src/wire/base64-encoding.ts

@@ -23,7 +23,7 @@
  *   "_" instead of "/",
  *   no padding
  */
-export function base64Decode(base64Str: string) {
+export function base64Decode(base64Str: string): Uint8Array<ArrayBuffer> {
   const table = getDecodeTable();
   // estimate byte size, not accounting for inner padding and whitespace
   let es = (base64Str.length * 3) / 4;
@@ -39,7 +39,7 @@ export function base64Decode(base64Str: string) {
     b = table[base64Str.charCodeAt(i)];
     if (b === undefined) {
       switch (base64Str[i]) {
-        // @ts-expect-error TS7029: Fallthrough case in switch
+        // @ts-ignore TS7029: Fallthrough case in switch -- ignore instead of expect-error for compiler settings without noFallthroughCasesInSwitch: true
         case "=":
           groupPos = 0; // reset state when padding found
         case "\n":

packages/protobuf/src/wire/binary-encoding.ts

@@ -130,7 +130,7 @@ export class BinaryWriter {
   /**
    * Return all bytes written and reset this writer.
    */
-  finish(): Uint8Array {
+  finish(): Uint8Array<ArrayBuffer> {
     if (this.buf.length) {
       this.chunks.push(new Uint8Array(this.buf)); // flush the buffer
       this.buf = [];
@@ -412,7 +412,7 @@ export class BinaryReader {
           // ignore
         }
         break;
-      // @ts-expect-error TS7029: Fallthrough case in switch
+      // @ts-ignore TS7029: Fallthrough case in switch -- ignore instead of expect-error for compiler settings without noFallthroughCasesInSwitch: true
       case WireType.Bit64:
         this.pos += 4;
       case WireType.Bit32:

packages/protobuf/src/wire/size-delimited.ts

@@ -54,7 +54,10 @@ export async function* sizeDelimitedDecodeStream<Desc extends DescMessage>(
   options?: BinaryReadOptions,
 ): AsyncIterableIterator<MessageShape<Desc>> {
   // append chunk to buffer, returning updated buffer
-  function append(buffer: Uint8Array, chunk: Uint8Array): Uint8Array {
+  function append(
+    buffer: Uint8Array<ArrayBuffer>,
+    chunk: Uint8Array,
+  ): Uint8Array<ArrayBuffer> {
     const n = new Uint8Array(buffer.byteLength + chunk.byteLength);
     n.set(buffer);
     n.set(chunk, buffer.length);

packages/protobuf/src/wire/text-encoding.ts

@@ -22,7 +22,7 @@ interface TextEncoding {
   /**
    * Encode UTF-8 text to binary.
    */
-  encodeUtf8: (text: string) => Uint8Array;
+  encodeUtf8: (text: string) => Uint8Array<ArrayBuffer>;
   /**
    * Decode UTF-8 text from binary.
    */
@@ -51,7 +51,7 @@ export function getTextEncoding() {
       globalThis as unknown as GlobalWithTextEncoderDecoder
     ).TextDecoder();
     (globalThis as GlobalWithTextEncoding)[symbol] = {
-      encodeUtf8(text: string): Uint8Array {
+      encodeUtf8(text: string): Uint8Array<ArrayBuffer> {
         return te.encode(text);
       },
       decodeUtf8(bytes: Uint8Array): string {
@@ -77,7 +77,7 @@ type GlobalWithTextEncoding = {
 type GlobalWithTextEncoderDecoder = {
   TextEncoder: {
     new (): {
-      encode(text: string): Uint8Array;
+      encode(text: string): Uint8Array<ArrayBuffer>;
     };
   };
   TextDecoder: {