type-system.md

Type system

The table below is a mapping between scale-codec types (Rust) and TypeScript types that we're using for Dedot:

Scale Codec (Rust)	TypeScript (dedot)
u8, u16, u32, i8, i16, i32	number
u64, u128, u256, i64, i128, i256	bigint (native BigInt, not bn.js)
bool	boolean (true, false)
Option<T>	T | undefined
Result<Ok, Err>	{ isOk: true; isErr?: false; value: Ok }
Vec<T>	Array<T>
str	string
Tuple: (A, B), ()	[A, B], []
Struct: struct { field_1: u8, field_2: str }	{ field_1: number, field_2: string }
Enum: enum { Variant1(u8), Variant2(bool), Variant3 }	{ type: 'Variant1', value: number }
FlatEnum: enum { Variant1, Variant2 }	'Variant1' | 'Variant2'