chore: remove intl-segmenter-polyfill (#735)

Author: ota-meshi

docs/.vitepress/theme/index.ts

@@ -19,10 +19,6 @@ const theme: Theme = {
     async enhanceApp(ctx) {
         DefaultTheme.enhanceApp(ctx)
 
-        if (typeof Intl.Segmenter === "undefined") {
-            await setupIntlSegmenter()
-        }
-
         const ESLintCodeBlock = await import(
             "./components/eslint-code-block.vue"
         ).then((m) => m.default ?? m)
@@ -34,19 +30,3 @@ const theme: Theme = {
     },
 }
 export default theme
-
-// We can remove this polyfill once Firefox supports Intl.Segmenter.
-async function setupIntlSegmenter() {
-    // For Firefox
-    const [{ createIntlSegmenterPolyfill }, breakIteratorUrl] =
-        await Promise.all([
-            import("intl-segmenter-polyfill"),
-            import(
-                // @ts-expect-error -- polyfill
-                "intl-segmenter-polyfill/dist/break_iterator.wasm?url"
-            ).then((m) => m.default ?? m),
-        ])
-
-    // @ts-expect-error -- polyfill
-    Intl.Segmenter = await createIntlSegmenterPolyfill(fetch(breakIteratorUrl))
-}

package-lock.json

@@ -100,7 +100,6 @@
         "eslint-plugin-vue": "^9.26.0",
         "eslint-plugin-yml": "^1.14.0",
         "eslint-snapshot-rule-tester": "^0.1.0",
-        "intl-segmenter-polyfill": "^0.4.4",
         "markdownlint-cli": "^0.41.0",
         "mocha": "^10.0.0",
         "mocha-chai-jest-snapshot": "^1.1.3",