fix: decode diagnostic file URLs before reading sources

packages/vite-plugin-checker/__tests__/sources.spec.ts

@@ -0,0 +1,36 @@
+import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import path from 'node:path'
+import { pathToFileURL } from 'node:url'
+import { expect, it } from 'vitest'
+import { normalizePath, readSources } from '../src/sources'
+
+it.each([
+  'with space.ts',
+  'percent%.ts',
+  'hash#.ts',
+  '中文.ts',
+])('reads a diagnostic file URL for %s', async (name) => {
+  const root = await mkdtemp(path.join(tmpdir(), 'checker-url-'))
+  try {
+    const file = path.join(root, name)
+    await writeFile(file, 'debugger;\n')
+    const normalized = normalizePath(pathToFileURL(file).href, root)
+    expect(normalized).toBe(file)
+    expect((await readSources([normalized])).get(normalized)).toBe(
+      await readFile(file, 'utf8'),
+    )
+  } finally {
+    await rm(root, { recursive: true, force: true })
+  }
+})
+
+it('leaves ordinary relative and absolute paths unchanged', () => {
+  const root = path.resolve('/project')
+  expect(normalizePath('src/a%20.ts', root)).toBe(
+    path.join(root, 'src/a%20.ts'),
+  )
+  expect(normalizePath(path.join(root, 'src/a.ts'), root)).toBe(
+    path.join(root, 'src/a.ts'),
+  )
+})

packages/vite-plugin-checker/src/sources.ts

@@ -1,11 +1,12 @@
 import fs from 'node:fs/promises'
 import path from 'node:path'
+import { fileURLToPath } from 'node:url'
 
 export function normalizePath(p: string, cwd: string) {
   let filename = p
-  // Strip file:// URL scheme (oxlint outputs file:// URLs in JSON format)
-  if (filename && filename.startsWith('file://')) {
-    filename = filename.slice(7)
+  // Decode file URLs, including escaped characters and platform-specific paths.
+  if (filename.startsWith('file://')) {
+    filename = fileURLToPath(filename)
   }
   if (filename) {
     filename = path.isAbsolute(filename)