filter: Add test for mixed strings and regex.

src/lib/initOptions.ts

@@ -21,7 +21,7 @@ function parseFilterExpression(filterExpression: FilterPattern | undefined): Fil
     Array.isArray(filterExpression) &&
     (filterExpression.length === 0 || typeof filterExpression[0] === 'string')
   ) {
-    const filtered = (filterExpression as string[]).map(s => s.trim()).filter(x => x)
+    const filtered = filterExpression.map(s => (typeof s === 'string' ? s.trim() : s)).filter(x => x)
     return filtered.length > 0 ? filtered : undefined
   } else {
     return filterExpression

test/filter.test.ts

@@ -158,6 +158,25 @@ describe('filter', () => {
       upgraded.should.have.property('fp-and-or')
     })
 
+    it('filter with array of mixed strings and regex', async () => {
+      const upgraded = (await ncu({
+        packageData: {
+          dependencies: {
+            'fp-and-or': '0.1.0',
+            lodash: '2.0.0',
+            'lodash.map': '2.0.0',
+            'lodash.filter': '2.0.0',
+          },
+        },
+        filter: ['fp-and-or', /lodash\..*/],
+      })) as Index<string>
+      upgraded.should.deep.equal({
+        'fp-and-or': '99.9.9',
+        'lodash.map': '99.9.9',
+        'lodash.filter': '99.9.9',
+      })
+    })
+
     it('filter with array of regex strings', async () => {
       const upgraded = (await ncu({
         packageData: {