Inserts all the specified values at the head of the list stored at key. If key does not exist, it is created as empty list before performing the push operations.
|key||string||key holding the list to left push to.|
|values||any||values to push to the list.|
|Type||Resolves with||Rejected when|
|Promise<number>||On success, the promise resolves with the length of the list after the push.||When key holds a value that is not a list, the promise is rejected with an error.|