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ICSE 2019
Sat 25 - Fri 31 May 2019 Montreal, QC, Canada
Wed 29 May 2019 16:40 - 17:00 at St-Paul / Ste-Catherine - Program Comprehension and Reuse Chair(s): Baishakhi Ray

JavaScript is dynamically typed and hence lacks the type safety of statically typed languages, leading to suboptimal IDE support, difficult to understand APIs, and unexpected runtime behavior. Several gradual type systems have been proposed, e.g., Flow and TypeScript, but they rely on developers to annotate code with types. This paper presents NL2Type, a learning-based approach for predicting likely type signatures of JavaScript functions. The key idea is to exploit natural language information in source code, such as comments, function names, and parameter names, a rich source of knowledge that is typically ignored by type inference algorithms. We formulate the problem of predicting types as a classification problem and train a recurrent, LSTM-based neural model that, after learning from an annotated code base, predicts function types for unannotated code. We evaluate the approach with a corpus of 162,673 JavaScript files from real-world projects. NL2Type predicts types with a precision of 84.1% and a recall of 78.9% when considering only the top-most suggestion, and with a precision of 95.5% and a recall of 89.6% when considering the top-5 suggestions. The approach clearly outperforms JSNice, a state-of-the-art approach that analyzes implementations of functions instead of natural language information, and DeepTyper, a recent type prediction approach that is also based on deep learning. Beyond predicting types, NL2Type serves as a consistency checker for existing type annotations. We show that it discovers 39 inconsistencies that deserve developer attention (from a manual analysis of 50 warnings), most of which are due to incorrect type annotations.

Wed 29 May
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16:00 - 18:00: Papers - Program Comprehension and Reuse at St-Paul / Ste-Catherine
Chair(s): Baishakhi RayColumbia University, New York
icse-2019-Technical-Papers16:00 - 16:20
Aishwarya SivaramanUniversity of California, Los Angeles, Tianyi ZhangUniversity of California, Los Angeles, Guy Van den BroeckUniversity of California, Los Angeles, Miryung KimUniversity of California, Los Angeles
icse-2019-Journal-First-Paper16:20 - 16:30
Abdul Razzaq, Asanka WasalaUniversity of Limerick, Chris ExtonUniversity of Limerick, Jim BuckleyLero - The Irish Software Research Centre and University of Limerick
icse-2019-Journal-First-Paper16:30 - 16:40
Yanjie JiangBeijing Institute of Technology, Hui LiuBeijing Institute of Technology, Jiaqi ZhuBeijing Institute of Technology, Lu ZhangPeking University
icse-2019-Technical-Papers16:40 - 17:00
Rabee Sohail MalikTU Darmstadt, Jibesh PatraTechnical University of Darmstadt, Michael PradelUniversity of Stuttgart
Pre-print Media Attached File Attached
icse-2019-Technical-Papers17:00 - 17:20
Tianyi ZhangUniversity of California, Los Angeles, Di YangUniversity of California at Irvine, USA, Crista Lopes, Miryung KimUniversity of California, Los Angeles
icse-2019-Technical-Papers17:20 - 17:40
Eric HortonNorth Carolina State University, Chris ParninNCSU
icse-2019-Paper-Presentations17:40 - 18:00