SNOW-1789882: Accept readonly arrays as Binds

[omerchn]

Version: snowflake-sdk@1.14.0

Currently, Binds are typed as followed:

export type Bind = string | number;
export type InsertBinds = Bind[][];
export type Binds = Bind[] | InsertBinds;

So if I have an array that is typed as a ReadonlyArray:

const binds = ['some', 'value'] as const
// or
const binds: readonly string[] = ['some', 'value']
// or in my case, I use Knex.js to construct queries and pass binds from knex into the sdk. knex binds are typed as readonly.
const binds = sql.toSQL().bindings

I get the following type error:

Type 'readonly string[]' is not assignable to type 'Binds | undefined'.
  The type 'readonly string[]' is 'readonly' and cannot be assigned to the mutable type 'InsertBinds'.

Technically, there should not be an issue with accepting a readonly array, It's only a TypeScript construct and in JavaScript's view it's a just normal array.

I suggest changing the types to be as followed:

type ArrayOrReadonlyArray<T> = T[] | readonly T[];
export type InsertBinds = ArrayOrReadonlyArray<ArrayOrReadonlyArray<Bind>>;
export type Binds = ArrayOrReadonlyArray<Bind> | InsertBinds;

Thank you!

[sfc-gh-dszmolka]

hi - thank you for the suggestion on the enhancement, we'll consider for future plans.