fix

Author: ota-meshi

package.json

@@ -76,6 +76,7 @@
     "postcss-load-config": "^3.1.4",
     "postcss-safe-parser": "^6.0.0",
     "postcss-selector-parser": "^6.0.11",
+    "semver": "^7.5.3",
     "svelte-eslint-parser": "^0.31.0"
   },
   "devDependencies": {
@@ -110,6 +111,7 @@
     "@types/node": "^18.11.0",
     "@types/postcss-safe-parser": "^5.0.1",
     "@types/prismjs": "^1.26.0",
+    "@types/semver": "^7.5.0",
     "@types/stylus": "^0.48.38",
     "@typescript-eslint/eslint-plugin": "^5.59.5",
     "@typescript-eslint/parser": "^5.59.5",
@@ -158,7 +160,6 @@
     "prismjs": "^1.25.0",
     "rimraf": "^5.0.0",
     "sass": "^1.51.0",
-    "semver": "^7.3.5",
     "simple-git-hooks": "^2.8.0",
     "source-map-js": "^1.0.2",
     "stylelint": "^15.0.0",

src/shared/svelte-compile-warns/index.ts

@@ -21,6 +21,7 @@ import { extractLeadingComments } from "./extract-leading-comments"
 import { getLangValue } from "../../utils/ast-utils"
 import path from "path"
 import fs from "fs"
+import semver from "semver"
 
 type WarningTargetNode =
   | (AST.SvelteProgram & ASTNodeWithParent)
@@ -446,7 +447,9 @@ function getWarningsFromCode(code: string): {
   try {
     const result = compiler.compile(code, {
       generate: false,
-      customElement: true,
+      ...(semver.satisfies(compiler.VERSION, ">=4.0.0-0")
+        ? { customElement: true }
+        : {}),
     })
 
     return { warnings: result.warnings as Warning[], kind: "warn" }