eslint-plugin-promise/rules/lib/parentheses.js

Enforce best practices for JavaScript promises

/**
 * Adapted from `eslint-plugin-unicorn`
 * @license MIT
 */

'use strict'
const {
  isParenthesized,
  isOpeningParenToken,
  isClosingParenToken,
} = require('@eslint-community/eslint-utils')

/*
Get how many times the node is parenthesized.

@param {Node} node - The node to be checked.
@param {SourceCode} sourceCode - The source code object.
@returns {number}
*/
function getParenthesizedTimes(node, sourceCode) {
  let times = 0

  while (isParenthesized(times + 1, node, sourceCode)) {
    times++
  }

  return times
}

/*
Get all parentheses tokens around the node.

@param {Node} node - The node to be checked.
@param {SourceCode} sourceCode - The source code object.
@returns {Token[]}
*/
function getParentheses(node, sourceCode) {
  const count = getParenthesizedTimes(node, sourceCode)

  if (count === 0) {
    return []
  }

  return [
    ...sourceCode.getTokensBefore(node, { count, filter: isOpeningParenToken }),
    ...sourceCode.getTokensAfter(node, { count, filter: isClosingParenToken }),
  ]
}

module.exports = {
  isParenthesized,
  getParenthesizedTimes,
  getParentheses,
}