eslint-plugin-stylistic-compat/dist/rules/arrow-parens.js

Compatibility version of @stylistic/eslint-plugin for Node.js >= 12 and ESLint v8

'use strict';

var utils = require('../utils.js');
require('@babel/runtime-corejs3/core-js/object/from-entries');
require('@babel/runtime-corejs3/core-js/instance/map');
require('@babel/runtime-corejs3/core-js/instance/filter');
require('@babel/runtime-corejs3/core-js/object/entries');
require('@babel/runtime-corejs3/core-js/set');
require('@babel/runtime-corejs3/core-js/instance/flags');
require('@babel/runtime-corejs3/core-js/instance/includes');
require('@babel/runtime-corejs3/core-js/instance/starts-with');
require('../vendor.js');
require('@babel/runtime-corejs3/core-js/object/assign');
require('@babel/runtime-corejs3/core-js/object/create');
require('@babel/runtime-corejs3/core-js/object/freeze');
require('@babel/runtime-corejs3/core-js/array/is-array');
require('@babel/runtime-corejs3/core-js/instance/last-index-of');
require('@babel/runtime-corejs3/core-js/instance/slice');
require('@babel/runtime-corejs3/core-js/object/define-properties');
require('@babel/runtime-corejs3/core-js/object/keys');
require('@babel/runtime-corejs3/core-js/instance/index-of');
require('@babel/runtime-corejs3/core-js/instance/at');
require('@babel/runtime-corejs3/core-js/symbol');
require('@babel/runtime-corejs3/core-js/symbol/iterator');
require('@babel/runtime-corejs3/core-js/parse-int');
require('@babel/runtime-corejs3/core-js/parse-float');
require('@babel/runtime-corejs3/core-js/weak-map');
require('@babel/runtime-corejs3/core-js/object/define-property');
require('@babel/runtime-corejs3/core-js/global-this');
require('@babel/runtime-corejs3/core-js/instance/for-each');
require('@babel/runtime-corejs3/core-js/array/from');
require('eslint/use-at-your-own-risk');
require('eslint');
require('@babel/runtime-corejs3/core-js/object/get-own-property-descriptor');
require('@babel/runtime-corejs3/core-js/map');
require('@babel/runtime-corejs3/core-js/instance/some');
require('@babel/runtime-corejs3/core-js/instance/find');
require('@babel/runtime-corejs3/core-js/instance/every');
require('@babel/runtime-corejs3/core-js/instance/sort');
require('@babel/runtime-corejs3/core-js/array/of');
require('@babel/runtime-corejs3/core-js/instance/concat');
require('@babel/runtime-corejs3/core-js/instance/entries');
require('@babel/runtime-corejs3/core-js/instance/find-index');
require('@babel/runtime-corejs3/core-js/instance/flat');
require('@babel/runtime-corejs3/core-js/instance/keys');
require('@babel/runtime-corejs3/core-js/instance/values');
require('@babel/runtime-corejs3/core-js/object/get-own-property-names');
require('@babel/runtime-corejs3/core-js/number/is-finite');
require('@babel/runtime-corejs3/core-js/number/is-nan');
require('@babel/runtime-corejs3/core-js/number/parse-float');
require('@babel/runtime-corejs3/core-js/number/parse-int');
require('@babel/runtime-corejs3/core-js/object/is');
require('@babel/runtime-corejs3/core-js/object/is-extensible');
require('@babel/runtime-corejs3/core-js/object/is-frozen');
require('@babel/runtime-corejs3/core-js/object/is-sealed');
require('@babel/runtime-corejs3/core-js/object/values');
require('@babel/runtime-corejs3/core-js/string/from-code-point');
require('@babel/runtime-corejs3/core-js/string/raw');
require('@babel/runtime-corejs3/core-js/instance/code-point-at');
require('@babel/runtime-corejs3/core-js/instance/ends-with');
require('@babel/runtime-corejs3/core-js/instance/pad-end');
require('@babel/runtime-corejs3/core-js/instance/pad-start');
require('@babel/runtime-corejs3/core-js/instance/trim');
require('@babel/runtime-corejs3/core-js/instance/trim-end');
require('@babel/runtime-corejs3/core-js/instance/trim-left');
require('@babel/runtime-corejs3/core-js/instance/trim-right');
require('@babel/runtime-corejs3/core-js/instance/trim-start');
require('@babel/runtime-corejs3/core-js/symbol/for');
require('@babel/runtime-corejs3/core-js/symbol/key-for');
require('@babel/runtime-corejs3/core-js/object/prevent-extensions');
require('@babel/runtime-corejs3/core-js/object/seal');
require('@babel/runtime-corejs3/core-js/object/get-prototype-of');
require('@babel/runtime-corejs3/core-js/symbol/replace');
require('@babel/runtime-corejs3/core-js/instance/bind');
require('@babel/runtime-corejs3/core-js/instance/splice');
require('@babel/runtime-corejs3/core-js/instance/repeat');
require('@babel/runtime-corejs3/core-js/instance/reduce');
require('@babel/runtime-corejs3/core-js/instance/reverse');

function hasBlockBody(node) {
  return node.body.type === "BlockStatement";
}
var arrowParens = utils.createRule({
  name: "arrow-parens",
  package: "js",
  meta: {
    type: "layout",
    docs: {
      description: "Require parentheses around arrow function arguments"
    },
    fixable: "code",
    schema: [{
      type: "string",
      enum: ["always", "as-needed"]
    }, {
      type: "object",
      properties: {
        requireForBlockBody: {
          type: "boolean",
          default: false
        }
      },
      additionalProperties: false
    }],
    messages: {
      unexpectedParens: "Unexpected parentheses around single function argument.",
      expectedParens: "Expected parentheses around arrow function argument.",
      unexpectedParensInline: "Unexpected parentheses around single function argument having a body with no curly braces.",
      expectedParensBlock: "Expected parentheses around arrow function argument having a body with curly braces."
    }
  },
  create(context) {
    const asNeeded = context.options[0] === "as-needed";
    const requireForBlockBody = asNeeded && context.options[1] && context.options[1].requireForBlockBody === true;
    const sourceCode = context.sourceCode;
    function findOpeningParenOfParams(node) {
      const tokenBeforeParams = sourceCode.getTokenBefore(node.params[0]);
      if (tokenBeforeParams && utils.isOpeningParenToken(tokenBeforeParams) && node.range[0] <= tokenBeforeParams.range[0]) {
        return tokenBeforeParams;
      }
      return null;
    }
    function getClosingParenOfParams(node) {
      return sourceCode.getTokenAfter(node.params[0], utils.isClosingParenToken);
    }
    function hasCommentsInParensOfParams(node, openingParen) {
      return sourceCode.commentsExistBetween(openingParen, getClosingParenOfParams(node));
    }
    function hasUnexpectedTokensBeforeOpeningParen(node, openingParen) {
      const expectedCount = node.async ? 1 : 0;
      return sourceCode.getFirstToken(node, {
        skip: expectedCount
      }) !== openingParen;
    }
    return {
      "ArrowFunctionExpression[params.length=1]": function (node) {
        const shouldHaveParens = !asNeeded || requireForBlockBody && hasBlockBody(node);
        const openingParen = findOpeningParenOfParams(node);
        const hasParens = openingParen !== null;
        const [param] = node.params;
        if (shouldHaveParens && !hasParens) {
          context.report({
            node,
            messageId: requireForBlockBody ? "expectedParensBlock" : "expectedParens",
            loc: param.loc,
            *fix(fixer) {
              yield fixer.insertTextBefore(param, "(");
              yield fixer.insertTextAfter(param, ")");
            }
          });
        }
        if (!shouldHaveParens && hasParens && param.type === "Identifier" && !param.optional && !param.typeAnnotation && !node.returnType && !hasCommentsInParensOfParams(node, openingParen) && !hasUnexpectedTokensBeforeOpeningParen(node, openingParen)) {
          context.report({
            node,
            messageId: requireForBlockBody ? "unexpectedParensInline" : "unexpectedParens",
            loc: param.loc,
            *fix(fixer) {
              const tokenBeforeOpeningParen = sourceCode.getTokenBefore(openingParen);
              const closingParen = getClosingParenOfParams(node);
              if (tokenBeforeOpeningParen && tokenBeforeOpeningParen.range[1] === openingParen.range[0] && !utils.canTokensBeAdjacent(tokenBeforeOpeningParen, sourceCode.getFirstToken(param))) {
                yield fixer.insertTextBefore(openingParen, " ");
              }
              yield fixer.removeRange([openingParen.range[0], param.range[0]]);
              yield fixer.removeRange([param.range[1], closingParen.range[1]]);
            }
          });
        }
      }
    };
  }
});

module.exports = arrowParens;