Add HashFiles to the toolkit (#830)

* add hash files to the toolkit

packages/glob/src/glob.ts

@@ -1,5 +1,7 @@
 import {Globber, DefaultGlobber} from './internal-globber'
 import {GlobOptions} from './internal-glob-options'
+import {HashFileOptions} from './internal-hash-file-options'
+import {hashFiles as _hashFiles} from './internal-hash-files'
 
 export {Globber, GlobOptions}
 
@@ -15,3 +17,21 @@ export async function create(
 ): Promise<Globber> {
   return await DefaultGlobber.create(patterns, options)
 }
+
+/**
+ * Computes the sha256 hash of a glob
+ *
+ * @param patterns  Patterns separated by newlines
+ * @param options   Glob options
+ */
+export async function hashFiles(
+  patterns: string,
+  options?: HashFileOptions
+): Promise<string> {
+  let followSymbolicLinks = true
+  if (options && typeof options.followSymbolicLinks === 'boolean') {
+    followSymbolicLinks = options.followSymbolicLinks
+  }
+  const globber = await create(patterns, {followSymbolicLinks})
+  return _hashFiles(globber)
+}