perf: label more helpers as pure

Author: ChALkeR

fallback/_utils.js

@@ -10,10 +10,10 @@ export const E_STRICT_UNICODE = 'Input is not well-formed Unicode'
 let isNative = (x) => x && (haveNativeBuffer || `${x}`.includes('[native code]'))
 if (!haveNativeBuffer && isNative(() => {})) isNative = () => false // e.g. XS, we don't want false positives
 
-export const nativeEncoder = isNative(TextEncoder) ? new TextEncoder() : null
-export const nativeDecoder = isNative(TextDecoder)
-  ? new TextDecoder('utf-8', { ignoreBOM: true })
-  : null
+export const nativeEncoder = /* @__PURE__ */ (() =>
+  isNative(TextEncoder) ? new TextEncoder() : null)()
+export const nativeDecoder = /* @__PURE__ */ (() =>
+  isNative(TextDecoder) ? new TextDecoder('utf-8', { ignoreBOM: true }) : null)()
 
 // Actually windows-1252, compatible with ascii and latin1 decoding
 // Beware that on non-latin1, i.e. on windows-1252, this is broken in ~all Node.js versions released

fallback/latin1.js

@@ -9,8 +9,8 @@ import {
   skipWeb,
 } from './_utils.js'
 
-const { atob } = globalThis
-const { toBase64: web64 } = Uint8Array.prototype
+const atob = /* @__PURE__ */ (() => globalThis.atob)()
+const web64 = /* @__PURE__ */ (() => Uint8Array.prototype.toBase64)()
 
 // See http://stackoverflow.com/a/22747272/680742, which says that lowest limit is in Chrome, with 0xffff args
 // On Hermes, actual max is 0x20_000 minus current stack depth, 1/16 of that should be safe
@@ -147,7 +147,7 @@ export function encodeAsciiPrefix(x, s) {
 export const encodeLatin1 = (str) => encodeCharcodes(str, new Uint8Array(str.length))
 
 // Expects nativeEncoder to be present
-const useEncodeInto = isHermes && nativeEncoder?.encodeInto
+const useEncodeInto = /* @__PURE__ */ (() => isHermes && nativeEncoder?.encodeInto)()
 export const encodeAscii = useEncodeInto
   ? (str, ERR) => {
       // Much faster in Hermes