assume TextEncoder.prototype.encodeInto() is always available

.vscode/settings.json

@@ -6,6 +6,7 @@
     "source.fixAll.eslint": true
   },
   "cSpell.words": [
-    "tsdoc"
+    "tsdoc",
+    "whatwg"
   ]
 }

src/utils/utf8.ts

@@ -84,19 +84,18 @@ export function utf8EncodeJs(str: string, output: Uint8Array, outputOffset: numb
   }
 }
 
+// TextEncoder and TextDecoder are standardized in whatwg encoding:
+// https://encoding.spec.whatwg.org/
+// and available in all the modern browsers:
+// https://caniuse.com/textencoder
+
 const sharedTextEncoder = new TextEncoder();
 const TEXT_ENCODER_THRESHOLD = 200;
 
-function utf8EncodeTEencode(str: string, output: Uint8Array, outputOffset: number): void {
-  output.set(sharedTextEncoder.encode(str), outputOffset);
-}
-
-function utf8EncodeTEencodeInto(str: string, output: Uint8Array, outputOffset: number): void {
+export function utf8EncodeTE(str: string, output: Uint8Array, outputOffset: number): void {
   sharedTextEncoder.encodeInto(str, output.subarray(outputOffset));
 }
 
-export const utf8EncodeTE = (sharedTextEncoder.encodeInto as unknown) ? utf8EncodeTEencodeInto : utf8EncodeTEencode;
-
 export function utf8Encode(str: string, output: Uint8Array, outputOffset: number): void {
   if (str.length > TEXT_ENCODER_THRESHOLD) {
     utf8EncodeTE(str, output, outputOffset);