feat: export traverse function.

index.js

@@ -344,3 +344,6 @@ module.exports.ensureParsed = ensureParsed;
 module.exports.extract = extract;
 module.exports.compilePattern = compilePattern;
 module.exports.depFinder = depFinder;
+module.exports.STOP = STOP;
+module.exports.SKIP_BRANCH = SKIP_BRANCH;
+module.exports.traverse = traverse;

spec/index-exports.spec.js

@@ -0,0 +1,17 @@
+'use strict';
+const test = require('tape');
+
+const astMatcher = require('../index');
+
+test('got exports', t => {
+  t.ok(astMatcher);
+  t.ok(astMatcher.setParser);
+  t.ok(astMatcher.ensureParsed);
+  t.ok(astMatcher.extract);
+  t.ok(astMatcher.compilePattern);
+  t.ok(astMatcher.depFinder);
+  t.ok(astMatcher.hasOwnProperty('STOP'));
+  t.ok(astMatcher.hasOwnProperty('SKIP_BRANCH'));
+  t.ok(astMatcher.traverse);
+  t.end();
+});