Bump to v4.0.0.

deburr.js

@@ -0,0 +1,35 @@
+import deburrLetter from './internal/deburrLetter';
+import toString from './toString';
+
+/** Used to match latin-1 supplementary letters (excluding mathematical operators). */
+var reLatin1 = /[\xc0-\xd6\xd8-\xde\xdf-\xf6\xf8-\xff]/g;
+
+/** Used to compose unicode character classes. */
+var rsComboRange = '\\u0300-\\u036f\\ufe20-\\ufe23';
+
+/** Used to compose unicode capture groups. */
+var rsCombo = '[' + rsComboRange + ']';
+
+/** Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). */
+var reComboMark = RegExp(rsCombo, 'g');
+
+/**
+ * Deburrs `string` by converting [latin-1 supplementary letters](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
+ * to basic latin letters and removing [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to deburr.
+ * @returns {string} Returns the deburred string.
+ * @example
+ *
+ * _.deburr('déjà vu');
+ * // => 'deja vu'
+ */
+function deburr(string) {
+  string = toString(string);
+  return string && string.replace(reLatin1, deburrLetter).replace(reComboMark, '');
+}
+
+export default deburr;