In this paper we present the design and implementation of Flow, a fast and precise type checker for JavaScript that is used by thousands of developers on millions of lines of code at Facebook every day. Flow uses sophisticated type inference to understand common JavaScript idioms precisely. This helps it find non-trivial bugs in code and provide code intelligence to editors without requiring significant rewriting or annotations from the developer. We formalize an important fragment of Flow’s analysis and prove its soundness. Furthermore, Flow uses aggressive parallelization and incrementalization to deliver near-instantaneous response times. This helps it avoid introducing any latency in the usual edit-refresh cycle of rapid JavaScript development. We describe the algorithms and systems infrastructure that we built to scale Flow’s analysis.
Wed 25 OctDisplayed time zone: Tijuana, Baja California change
10:30 - 12:00 | |||
10:30 22mTalk | SAVI Objects: Sharing and Virtuality Incorporated OOPSLA Izzat El Hajj University of Illinois at Urbana-Champaign, USA, Thomas B. Jablin University of Illinois at Urbana-Champaign, USA / Multicoreware, USA, Dejan Milojicic Hewlett Packard Labs, USA, Wen-mei Hwu University of Illinois at Urbana-Champaign, USA DOI | ||
10:52 22mTalk | A Simple Soundness Proof for Dependent Object Types OOPSLA Marianna Rapoport University of Waterloo, Canada, Ifaz Kabir University of Waterloo, Canada, Paul He University of Waterloo, Canada, Ondřej Lhoták University of Waterloo, Canada DOI | ||
11:15 22mTalk | Unifying Typing and Subtyping OOPSLA DOI | ||
11:37 22mTalk | Fast and Precise Type Checking for JavaScript OOPSLA Avik Chaudhuri Facebook, USA, Panagiotis Vekris University of California at San Diego, USA, Sam Goldman Facebook, USA, Marshall Roch Facebook, USA, Gabriel Levi Facebook, USA DOI | ||