fix(index): export the real toString implementation

README.md

@@ -191,6 +191,7 @@ Sanitizer                              | Description
 **toDate(input)**                      | convert the input string to a date, or `null` if the input is not a date.
 **toFloat(input)**                     | convert the input string to a float, or `NaN` if the input is not a float.
 **toInt(input [, radix])**             | convert the input string to an integer, or `NaN` if the input is not an integer.
+**toString(input)**                    | convert the input to a string. `null`, `undefined` and `NaN` are converted to an empty string, and objects are converted using their own `toString` method.
 **trim(input [, chars])**              | trim characters (whitespace by default) from both sides of the input.
 **unescape(input)**                    | replace HTML encoded entities with `<`, `>`, `&`, `'`, `"`, `` ` ``, `\` and `/`.
 **whitelist(input, chars)**            | remove characters that do not appear in the whitelist. The characters are used in a RegExp and so you will need to escape some chars, e.g. `whitelist(input, '\\[\\]')`.

src/index.js

@@ -123,6 +123,7 @@ import blacklist from './lib/blacklist';
 import isWhitelisted from './lib/isWhitelisted';
 
 import normalizeEmail from './lib/normalizeEmail';
+import toString from './lib/util/toString';
 
 import isSlug from './lib/isSlug';
 import isLicensePlate from './lib/isLicensePlate';

test/exports.test.js

@@ -24,6 +24,14 @@ describe('Exports', () => {
     assert.strictEqual(typeof validator.toFloat, 'function');
   });
 
+  it('should export toString and not inherit Object.prototype.toString', () => {
+    assert.notStrictEqual(validator.toString, Object.prototype.toString);
+    assert.strictEqual(validator.toString('test'), 'test');
+    assert.strictEqual(validator.toString(123), '123');
+    assert.strictEqual(validator.toString(null), '');
+    assert.strictEqual(validator.toString(undefined), '');
+  });
+
   it('should export the version number', () => {
     /* eslint-disable global-require */
     assert.strictEqual(

test/sanitizers.test.js

@@ -153,6 +153,18 @@ describe('Sanitizers', () => {
     });
   });
 
+  it('should convert inputs to strings', () => {
+    test({
+      sanitizer: 'toString',
+      expect: {
+        foo: 'foo',
+        '': '',
+        123: '123',
+        ' bar ': ' bar ',
+      },
+    });
+  });
+
   it('should escape HTML', () => {
     test({
       sanitizer: 'escape',