Facebook has used Flow for many of its ... Flow allows the developer to check only portions of the code. JavaScript frameworks often use techniques, such as reflection, that make it difficult ...

The latest trends and issues around the use of open source ... the performance of Facebook’s apps, we have teams that continuously improve our JavaScript code and platforms.

These days, writing software involves an ecosystem of tools, from the programs that developers use to ... of JavaScript code. By the end of that year, it had been passed by Facebook's then-new ...