squint-cli/src/utils.ts

Squint makes visual reviews of web app releases easy

import fs from 'fs'
import _ from 'lodash'

// https://github.com/sindresorhus/p-each-series/blob/main/license
// Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
const PROMISE_EACH_SERIES_STOP = Symbol('promiseEachSeries.stop')

export async function promiseEachSeries<T>(
  iterable: Iterable<T>,
  iterator: (
    value: T,
    index: number
  ) => Promise<void | typeof PROMISE_EACH_SERIES_STOP>
) {
  let index = 0

  for (const value of iterable) {
    // eslint-disable-next-line no-await-in-loop
    const returnValue = await iterator(await value, index++)

    if (returnValue === PROMISE_EACH_SERIES_STOP) {
      break
    }
  }

  return iterable
}

// lodash is in scope for evaluated code
export function evalJs(code: string, ...args: any[]): any {
  let result: any
  const codeToEval = `(() => { return ${code}; })()`
  try {
    const afterEval = eval(codeToEval)
    if (_.isFunction(afterEval)) {
      result = afterEval(...args)
    } else {
      result = afterEval
    }
  } catch (e) {
    console.error(`Unable to \`eval\` code: ${e.message}`)
    console.error('Evaluated code:')
    console.error(codeToEval)
    throw e
  }

  return result
}

export async function mkdirp(dir: string) {
  try {
    await fs.promises.mkdir(dir, { recursive: true })
  } catch (e) {
    // ignore
  }
}

export function union<T>(setA: Set<T>, setB: Set<T>) {
  const _union = new Set(setA)
  for (const elem of setB) {
    _union.add(elem)
  }
  return _union
}