1. A computer storage media storing computer-executable instructions, which when executed perform actions, comprising: obtaining a first computer code encoded in a first computer programming language, the first computer code being translated from a second computer code encoded in a second computer language, the first computer programming language being a higher level language than the second computer language; via a user interface, receiving changes in the first computer programming language to the first computer code, the changes to the first computer code thereby creates a third computer code encoded in the first computer programming language and the changes include inserting helper computer code and new features to the first computer code; translating the third computer code encoded in the first computer programming language into a fourth computer code encoded in the second computer programming language; creating a delta that indicates changes in the second computer code of the second computer language by comparing the second computer code to the fourth computer code to identify changes in the second and fourth computer code encoded in the second programming language, the changes comprise actions that are to occur before, during, after, or instead of actions indicated by the first computer code; and linking an application to the fourth computer code to access the new features, the linking comprising: receiving, at the helper computer code from the application, a call to access a new feature, the helper computer code includes application programming interfaces (API) that correspond to each respective new feature; and in response to the access call, the helper code using the delta to determine which feature's API to invoke for the requesting application without causing the application to be rebuilt.