fix(cli): improve cac errors when mixing boolean and dot notation

packages/vitest/src/node/cli.ts

@@ -77,7 +77,33 @@ cli
   .command('[...filters]')
   .action((filters, options) => start('test', filters, options))
 
-cli.parse()
+try {
+  cli.parse()
+}
+catch (originalError) {
+  // CAC may fail to parse arguments when boolean flags and dot notation are mixed
+  // e.g. "--coverage --coverage.reporter text" will fail, when "--coverage.enabled --coverage.reporter text" will pass
+  const fullArguments = cli.rawArgs.join(' ')
+  const conflictingArgs: { arg: string; dotArgs: string[] }[] = []
+
+  for (const arg of cli.rawArgs) {
+    if (arg.startsWith('--') && !arg.includes('.') && fullArguments.includes(`${arg}.`)) {
+      const dotArgs = cli.rawArgs.filter(rawArg => rawArg.startsWith(arg) && rawArg.includes('.'))
+      conflictingArgs.push({ arg, dotArgs })
+    }
+  }
+
+  if (conflictingArgs.length === 0)
+    throw originalError
+
+  const error = conflictingArgs
+    .map(({ arg, dotArgs }) =>
+      `A boolean argument "${arg}" was used with dot notation arguments "${dotArgs.join(' ')}".`
+      + `\nPlease specify the "${arg}" argument with dot notation as well: "${arg}.enabled"`)
+    .join('\n')
+
+  throw new Error(error)
+}
 
 async function runRelated(relatedFiles: string[] | string, argv: CliOptions): Promise<void> {
   argv.related = relatedFiles

test/config/test/failures.test.ts

@@ -43,3 +43,17 @@ test('c8 coverage provider cannot be used with browser', async () => {
 
   expect(error).toMatch('Error: @vitest/coverage-c8 does not work with --browser. Use @vitest/coverage-istanbul instead')
 })
+
+test('boolean coverage flag without dot notation, with more dot notation options', async () => {
+  const { error } = await runVitest('run', ['--coverage', '--coverage.reporter', 'text'])
+
+  expect(error).toMatch('Error: A boolean argument "--coverage" was used with dot notation arguments "--coverage.reporter".')
+  expect(error).toMatch('Please specify the "--coverage" argument with dot notation as well: "--coverage.enabled"')
+})
+
+test('boolean browser flag without dot notation, with more dot notation options', async () => {
+  const { error } = await runVitest('run', ['--browser', '--browser.name', 'chrome'])
+
+  expect(error).toMatch('Error: A boolean argument "--browser" was used with dot notation arguments "--browser.name".')
+  expect(error).toMatch('Please specify the "--browser" argument with dot notation as well: "--browser.enabled"')
+})

test/config/test/utils.ts

@@ -6,7 +6,7 @@ export async function runVitest(mode: 'run' | 'watch', cliArguments: string[]) {
   let error = ''
 
   subprocess.stderr?.on('data', (data) => {
-    error = stripAnsi(data.toString())
+    error += stripAnsi(data.toString())
 
     // Sometimes on Windows CI execa doesn't exit properly. Force exit when stderr is caught.
     subprocess.kill()

test/config/vitest.config.ts

@@ -3,5 +3,8 @@ import { defineConfig } from 'vitest/config'
 export default defineConfig({
   test: {
     testTimeout: 60_000,
+    chaiConfig: {
+      truncateThreshold: 999,
+    },
   },
 })