test(legacy): add a test to checks all inline snippets are valid JS (#15098)

Author: sapphi-red

packages/plugin-legacy/src/__tests__/snippets.spec.ts

@@ -1,15 +1,21 @@
-import { expect, test } from 'vitest'
+import { describe, expect, test } from 'vitest'
 import type { ecmaVersion } from 'acorn'
 import { parse } from 'acorn'
-import { detectModernBrowserDetector } from '../snippets'
+import {
+  detectModernBrowserCode,
+  detectModernBrowserDetector,
+  dynamicFallbackInlineCode,
+  safari10NoModuleFix,
+  systemJSInlineCode,
+} from '../snippets'
 
 const shouldFailVersions: ecmaVersion[] = []
 for (let v = 2015; v <= 2019; v++) {
   shouldFailVersions.push(v as ecmaVersion)
 }
 
-const shouldPassVersions: acorn.ecmaVersion[] = []
-for (let v = 2020; v <= 2022; v++) {
+const shouldPassVersions: ecmaVersion[] = []
+for (let v = 2020; v <= 2024; v++) {
   shouldPassVersions.push(v as ecmaVersion)
 }
 
@@ -34,3 +40,23 @@ for (const version of shouldPassVersions) {
     }).not.toThrow()
   })
 }
+
+describe('snippets are valid', () => {
+  const codes = {
+    safari10NoModuleFix,
+    systemJSInlineCode,
+    detectModernBrowserCode,
+    dynamicFallbackInlineCode,
+  }
+
+  for (const [name, value] of Object.entries(codes)) {
+    test(`${name} is valid JS`, () => {
+      expect(() => {
+        parse(value, {
+          ecmaVersion: 'latest',
+          sourceType: 'module',
+        })
+      }).not.toThrow()
+    })
+  }
+})