Type Alias PlatformList 

pub type PlatformList = SmallVec<[String; 2]>;

Most npm packages declare zero or one entry in os, cpu, libc. Two inline SmallVec slots cover empty on construction (zero heap alloc) and one-entry push (still zero heap) for ~99% of lockfile entries.

Aliased Type

pub struct PlatformList { /* private fields */ }