lodash: added signatures of the method _.dropWhile

lodash/lodash-tests.ts

@@ -240,6 +240,42 @@ module TestDropRight {
     result = _(list).dropRight<TResult>(42).value();
 }
 
+// _.dropWhile
+module TestDropWhile {
+    let array: TResult[];
+    let list: _.List<TResult>;
+    let predicateFn: (value: TResult, index: number, collection: _.List<TResult>) => boolean;
+    let result: TResult[];
+
+    result = _.dropWhile<TResult>(array);
+    result = _.dropWhile<TResult>(array, predicateFn);
+    result = _.dropWhile<TResult>(array, predicateFn, any);
+    result = _.dropWhile<TResult>(array, '')
+    result = _.dropWhile<TResult>(array, '', any);
+    result = _.dropWhile<{a: number;}, TResult>(array, {a: 42});
+
+    result = _.dropWhile<TResult>(list);
+    result = _.dropWhile<TResult>(list, predicateFn);
+    result = _.dropWhile<TResult>(list, predicateFn, any);
+    result = _.dropWhile<TResult>(list, '')
+    result = _.dropWhile<TResult>(list, '', any);
+    result = _.dropWhile<{a: number;}, TResult>(list, {a: 42});
+
+    result = _(array).dropWhile().value();
+    result = _(array).dropWhile(predicateFn).value();
+    result = _(array).dropWhile(predicateFn, any).value();
+    result = _(array).dropWhile('').value();
+    result = _(array).dropWhile('', any).value();
+    result = _(array).dropWhile<{a: number;}>({a: 42}).value();
+
+    result = _(list).dropWhile<TResult>().value();
+    result = _(list).dropWhile<TResult>(predicateFn).value();
+    result = _(list).dropWhile<TResult>(predicateFn, any).value();
+    result = _(list).dropWhile<TResult>('').value();
+    result = _(list).dropWhile<TResult>('', any).value();
+    result = _(list).dropWhile<{a: number;}, TResult>({a: 42}).value();
+}
+
 result = <number[]>_.rest([1, 2, 3]);
 result = <number[]>_.rest([1, 2, 3], 2);
 result = <number[]>_.rest([1, 2, 3], (num) => num < 3)

lodash/lodash.d.ts

@@ -457,6 +457,100 @@ declare module _ {
         dropRight<TResult>(n?: number): LoDashArrayWrapper<TResult>;
     }
 
+    //_.dropWhile
+    interface LoDashStatic {
+        /**
+         * Creates a slice of array excluding elements dropped from the beginning. Elements are dropped until predicate
+         * returns falsey. The predicate is bound to thisArg and invoked with three arguments: (value, index, array).
+         *
+         * If a property name is provided for predicate the created _.property style callback returns the property
+         * value of the given element.
+         *
+         * If a value is also provided for thisArg the created _.matchesProperty style callback returns true for
+         * elements that have a matching property value, else false.
+         *
+         * If an object is provided for predicate the created _.matches style callback returns true for elements that
+         * have the properties of the given object, else false.
+         *
+         * @param array The array to query.
+         * @param predicate The function invoked per iteration.
+         * @param thisArg The this binding of predicate.
+         * @return Returns the slice of array.
+         */
+        dropWhile<TValue>(
+            array: List<TValue>,
+            predicate?: ListIterator<TValue, boolean>,
+            thisArg?: any
+        ): TValue[];
+
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile<TValue>(
+            array: List<TValue>,
+            predicate?: string,
+            thisArg?: any
+        ): TValue[];
+
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile<TWhere, TValue>(
+            array: List<TValue>,
+            predicate?: TWhere
+        ): TValue[];
+    }
+
+    interface LoDashArrayWrapper<T> {
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile(
+            predicate?: ListIterator<T, boolean>,
+            thisArg?: any
+        ): LoDashArrayWrapper<T>;
+
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile(
+            predicate?: string,
+            thisArg?: any
+        ): LoDashArrayWrapper<T>;
+
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile<TWhere>(
+            predicate?: TWhere
+        ): LoDashArrayWrapper<T>;
+    }
+
+    interface LoDashObjectWrapper<T> {
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile<TValue>(
+            predicate?: ListIterator<TValue, boolean>,
+            thisArg?: any
+        ): LoDashArrayWrapper<TValue>;
+
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile<TValue>(
+            predicate?: string,
+            thisArg?: any
+        ): LoDashArrayWrapper<TValue>;
+
+        /**
+         * @see _.dropWhile
+         */
+        dropWhile<TWhere, TValue>(
+            predicate?: TWhere
+        ): LoDashArrayWrapper<TValue>;
+    }
+
     //_.findIndex
     interface LoDashStatic {
         /**