Remove legacy plugin

There was a recent change[^1] to `@vitejs/plugin-legacy` that made it
hard-code the target to `['es2020', 'edge79', 'firefox67', 'chrome64',
'safari11.1']`. This unfortunately means the build fails if there are
any async generators (i.e. `function* foo() {}`). I can't figure out how
to make Vite ignore the `ForAwait*.vue` components, so I'll remove the
legacy plugin for now.

[^1]:
    [PR](vitejs/vite#10072),
    [commit](vitejs/vite@a13a7eb)

.github/workflows/main.yml

@@ -87,7 +87,6 @@ jobs:
           VITE_COMMIT_HASH: ${{ github.sha }}
           VITE_SENTRY_DSN: https://[email protected]/6162360
           VITE_SENTRY_ENVIRONMENT: ${{ github.ref_name == 'main' && 'release' || 'development' }}
-          BUILDTIME_LEGACY_ENABLED: true
         run: pnpm run build:all
 
       - name: Setup Sentry

package.json

@@ -38,7 +38,6 @@
     "@types/node": "^18.7.18",
     "@typescript-eslint/eslint-plugin": "^5.38.0",
     "@typescript-eslint/parser": "^5.38.0",
-    "@vitejs/plugin-legacy": "^2.2.0",
     "@vitejs/plugin-vue": "^3.1.0",
     "@vitest/coverage-c8": "^0.23.4",
     "@vue/test-utils": "^2.0.2",

src/views/DebugInfo.vue

@@ -8,7 +8,6 @@ const debugInfo = {
   DEV: import.meta.env.DEV,
   SSR: import.meta.env.SSR,
   PROD: import.meta.env.PROD,
-  LEGACY: import.meta.env.LEGACY,
   BASE_URL: import.meta.env.BASE_URL,
   URL: import.meta.url,
   HOT: import.meta.hot ?? "(undefined)",

vite.config.ts

@@ -1,6 +1,5 @@
 /// <reference types="vitest" />
 
-import legacy from "@vitejs/plugin-legacy";
 import vue from "@vitejs/plugin-vue";
 import fs from "fs";
 import { fileURLToPath, URL } from "url";
@@ -24,7 +23,6 @@ export default defineConfig(({ mode }) => {
   const sunriseRoot = wasmSupported
     ? env.BUILDTIME_SUNRISE_CLI_ROOT ?? "../sunrise-cli"
     : "./src/fake/sunrise-cli";
-  const isLegacy = (env.BUILDTIME_LEGACY_ENABLED ?? "false") === "true";
   const isReproducible =
     (env.BUILDTIME_REPRODUCIBLE_ENABLED ?? "false") === "true";
 
@@ -107,7 +105,6 @@ export default defineConfig(({ mode }) => {
         },
       }),
       tailwindPlugin(),
-      isLegacy && legacy(),
     ],
   };
 });