warn instead of rewrite

src/util/log.js

@@ -12,6 +12,10 @@ function log(chalk, messages, key) {
   messages.forEach((message) => console.warn(chalk, '-', message))
 }
 
+export function dim(input) {
+  return chalk.dim(input)
+}
+
 export default {
   info(key, messages) {
     log(chalk.bold.cyan('info'), ...(Array.isArray(key) ? [key] : [messages, key]))

src/util/normalizeConfig.js

@@ -1,4 +1,4 @@
-import log from './log'
+import log, { dim } from './log'
 
 export function normalizeConfig(config) {
   // Quick structure validation
@@ -245,12 +245,18 @@ export function normalizeConfig(config) {
     })(),
   }
 
-  // Rewrite globs to prevent bogus globs.
+  // Validate globs to prevent bogus globs.
   // E.g.: `./src/*.{html}` is invalid, the `{html}` should just be `html`
-  config.content.files = config.content.files.map((file) => {
-    if (typeof file !== 'string') return file
-    return file.replace(/{([^,]*?)}/g, '$1')
-  })
+  for (let file of config.content.files) {
+    if (typeof file === 'string' && /{([^,]*?)}/g.test(file)) {
+      log.warn('invalid-glob-braces', [
+        `The global pattern ${dim(file)} in your config is invalid.`,
+        `      Update it to ${dim(file.replace(/{([^,]*?)}/g, '$1'))} to silence this warning.`,
+        // TODO: Add https://tw.wtf/invalid-glob-braces
+      ])
+      break
+    }
+  }
 
   return config
 }

tests/normalize-config.test.js

@@ -110,7 +110,10 @@ it('should keep content files with globs', () => {
   })
 })
 
-it('should rewrite globs with incorrect bracket expansion', () => {
+it('should warn when we detect invalid globs with incorrect brace expansion', () => {
+  let log = require('../src/util/log')
+  let spy = jest.spyOn(log.default, 'warn')
+
   let config = {
     content: [
       './{example-folder}/**/*.{html,js}',
@@ -119,13 +122,20 @@ it('should rewrite globs with incorrect bracket expansion', () => {
     ],
   }
 
+  // No rewrite happens
   expect(normalizeConfig(resolveConfig(config)).content).toEqual({
     files: [
-      './example-folder/**/*.{html,js}',
-      './example-folder/**/*.html',
-      './example-folder/**/*.html',
+      './{example-folder}/**/*.{html,js}',
+      './{example-folder}/**/*.{html}',
+      './example-folder/**/*.{html}',
     ],
     extract: {},
     transform: {},
   })
+
+  // But a warning should happen
+  expect(spy).toHaveBeenCalledTimes(2)
+  expect(spy.mock.calls.map((x) => x[0])).toEqual(['invalid-glob-braces', 'invalid-glob-braces'])
+
+  spy.mockClear()
 })