askirmas / postcss-d-ts

import {readFileSync} from 'fs'

import postcss = require('postcss')

import plugin = require("./src")

import type { Options } from './src/options.types'

export type RunOpts = Partial<{

  from: string

  input: string

  output: string

  errorsCount: number

}>

const {parse: $parse} = JSON

, eol = "\n"

export default run

export {

  rfs, rfsl, readOpts, suiteName, launcher

}

function launcher(opts?: Options) {

  return postcss([plugin(opts)])

}

async function run(runOpts: RunOpts, opts?: Options) {

  const {

    errorsCount = 0,

    from,

    input = from && rfs(from)

  } = runOpts

  if (!input)

    throw Error("no test input")

  const result = await launcher(opts).process(input, { from })

  , {

    //TODO propagate modality with opts

    output = from && rfs(`${from.replace(/\.css$/, '')}.SHOULD.d.ts`)

  } = runOpts

  expect(result.warnings()).toHaveLength(errorsCount)

  if (output)

    expect(

      rfsl(`${from}.d.ts`)

    ).toStrictEqual(

      output

      .split(eol)

    )

}

function rfs(path: string) {

  return readFileSync(path).toString()

}

function rfsl(path: string) {

  return rfs(path).split('\n')

}

function readOpts(path: string) {

  return $parse(rfs(path)) as Options

}

function suiteName(path: string) {

  return path

  .replace(/^.*[\/\\]/, '')

  .replace(/\..*$/, '')

}