Code snippets are widely used in technical forums to demonstrate solutions to programming problems. They can be leveraged by developers to accelerate problem-solving. However, code snippets often lack concrete types of the APIs used in them, which impedes their understanding and resue. To enhance the description of a code snippet, a number of approaches are proposed to infer the types of APIs. Although existing approaches can achieve good performance, their performance is limited by ignoring other information outside the input code snippet (e.g., the descriptions of similar code snippets) that could potentially improve the performance. In this paper, we propose a novel type inference approach, named CKTyper, by leveraging crowdsourcing knowledge in technical posts. The key idea is to generate a relevant context for a target code snippet from the posts containing similar code snippets and then employ the context to promote the type inference with large language models (e.g., ChatGPT). More specifically, we build a crowdsourcing knowledge base (CKB) by extracting code snippets from a large set of posts and index the CKB using Lucene. An API type dictionary is also built from a set of API libraries. Given a code snippet to be inferred, we first retrieve a list of similar code snippets from the indexed CKB. Then, we generate a crowdsourcing knowledge context (CKC) by extracting and summarizing useful content (e.g., API-related sentences) in the posts that contain the similar code snippets. The CKC is subsequently used to improve the type inference of ChatGPT on the input code snippet. The hallucination of ChatGPT is eliminated by employing the API type dictionary. Evaluation results on two open-source datasets demonstrate the effectiveness and efficiency of CKTyper. CKTyper achieves the optimal precision/recall of 97.80% and 95.54% on both datasets, respectively, significantly outperforming three state-of-the-art baselines and ChatGPT.
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