Tiny singleton

This is a trivial, isomorphic, straightforward, TypeScript-compatible singleton implementation:

• NO dependencies
• lazily created on 1st use, as expected

Usage

Be sure to review your options before using the singleton pattern. While there are legitimate usages, it can also be a code smell close to a global variable.

// "@offirmo/tiny-singleton": "^0",
import tiny_singleton from '@offirmo/tiny-singleton'

// example: a DB client is a correct case where the singleton pattern can be useful
function create_db_client(ip: string, logger: Console = console): DBClient {
    return ...
}

// example 1: best semantic
const get_db_client = tiny_singleton(() => create_db_client('127.0.0.1'))
get_db_client().read(1234).then(...)

// example 2: with params (not recommended as the params will only affect the 1st call, but sometimes convenient)
const get_db_client = tiny_singleton(create_db_client)
// alternative (not better, just an alternative example)
const get_db_client = tiny_singleton((options?: CreationOptions) => create_db_client(options.ip || '127.0.0.1'))
get_db_client('127.0.0.1')
get_db_client('1.2.3.4') // XXX This will return the same as above!! No new instance creation.
get_db_client().write('hello').then(...)