miniblog.

In LSP, a position is represented as a line number and a column offset (in Unicode code units): https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#position This is pretty elegant. You'll get the correct line regardless of encoding bugs, and the editor already knows the line number so it's cheap to compute.

Today I learnt that Cell<T> has the size of a pointer (i.e. probably 64 bits) in Rust, regardless of the size of T. It's a common pattern for making struct fields mutable, but the T isn't actually stored inside the struct.

The TypeScript docs have IDE-like hover types on all the examples, which is really impressive. I also like how the second example always shows the type of the relevant part, regardless of mouse position. It's clear and mobile friendly. Screenshot from https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types