fix bug in example, options object is required

Also put a guard in place in the constructor itself to make this even
more clear.

Fix: #538

Author: isaacs

README.md

@@ -55,7 +55,7 @@ const filesStream = globStream(['**/*.dat', 'logs/**/*.log'])
 // construct a Glob object if you wanna do it that way, which
 // allows for much faster walks if you have to look in the same
 // folder multiple times.
-const g = new Glob('**/foo')
+const g = new Glob('**/foo', {})
 // glob objects are async iterators, can also do globIterate() or
 // g.iterate(), same deal
 for await (const file of g) {
@@ -358,6 +358,8 @@ An object that can perform glob pattern traversals.
 
 ### `const g = new Glob(pattern: string | string[], options: GlobOptions)`
 
+Options object is required.
+
 See full options descriptions below.
 
 Note that a previous `Glob` object can be passed as the

src/glob.ts

@@ -379,6 +379,9 @@ export class Glob<Opts extends GlobOptions> implements GlobOptions {
    * again.
    */
   constructor(pattern: string | string[], opts: Opts) {
+    /* c8 ignore start */
+    if (!opts) throw new TypeError('glob options required')
+    /* c8 ignore stop */
     this.withFileTypes = !!opts.withFileTypes as FileTypes<Opts>
     this.signal = opts.signal
     this.follow = !!opts.follow