askirmas / postcss-d-ts

import {readFileSync, unlink, exists} from "fs"

import {promisify} from "util"

import type { SchemaWithDefaultsAndExamples, DefaultsAndExamplesFromSchema } from "./ts-swiss.types"

const {keys: $keys} = Object

, $exists = promisify(exists)

, _unlink = promisify(unlink)

export {

  regexpize,

  extractDefaults,

  readlineSync,

  $exists,

  $unlink

}

function regexpize(source: string|RegExp, flags = "") {

  return typeof source === "string"

  ? new RegExp(source, flags)

  : source

}

function extractDefaults<S extends SchemaWithDefaultsAndExamples>({properties}: S) {

  const keys: Array<keyof typeof properties> = $keys(properties)

  , {length} = keys

  , defaults: Partial<DefaultsAndExamplesFromSchema<S>> = {}

  for (let i = length; i--; ) {

    const key = keys[i]

    //@ts-ignore

    defaults[key] = properties[key].default

  }

  return defaults as DefaultsAndExamplesFromSchema<S>

}

//TODO replace with common

function readlineSync(path: string, splitter: string) {

  return readFileSync(path).toString().split(splitter)

}

function $unlink(source: Parameters<typeof _unlink>[0]) {

  return $exists(source)

  .then(ex => ex ? _unlink(source) : void 0)

}