[victorNicollet]

The host language is the language that you are using to write the compiler/interpreter. I suppose the grandparent is asking the question in order to recommend a parser generator for your use case. From your GitHub profile, I assume it's JS or TypeScript ?

[danielvaughn]

Ah I see, thanks. Probably Typescript, although I'm considering Rust as well. I'm using tree-sitter for the lexer.