ESInfer – Make JavaScript Type-Safe
Hello, folks. I'm Jiang, the author of ESInfer. I love writing Javascript because it has a prosperous ecosystem and is quick to get my hands dirty. However, sometimes it's painful when the flow is not fast to follow due to the lack of a type system. To solve this, I wrote ESInfer, a statical inference tool, to automatically type check and generate type annotations for Javascript. It works with pure Javascript without any add-ons to the language or user-space code and supports highly dynamic features, such as the modification of prototypes. It is still in the very early stage, which offers…
In plain words
ESInfer is a static analysis tool that automatically type checks and generates type annotations for JavaScript code. It works with pure JavaScript without requiring language extensions or code modifications, and supports dynamic features like prototype manipulation. The tool currently covers ES5 and selected ES6 features, with ongoing development to expand ES6+ support. It is designed for JavaScript developers who want type safety without manually writing type annotations.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hello, folks. I'm Jiang, the author of ESInfer. I love writing Javascript because it has a prosperous ecosystem and is quick to get my hands dirty. However, sometimes it's painful when the flow is not fast to follow due to the lack of a type system. To solve this, I wrote ESInfer, a statical inference tool, to automatically type check and generate type annotations for Javascript. It works with pure Javascript without any add-ons to the language or user-space code and supports highly dynamic features, such as the modification of prototypes. It is still in the very early stage, which offers almost all ES5 features and a select set of ES6 features like array/object destructing. I'm working hard to bring all ES6+ features into it incrementally. If you heavily use javascript/typescript and do NOT want to write the type annotation sh*ts anymore, give it a try :)
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