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node_modules/eslint/lib/rules/arrow-parens.js
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/**
* @fileoverview Rule to require parens in arrow function arguments.
* @author Jxck
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require parentheses around arrow function arguments",
category: "ECMAScript 6",
recommended: false
},
fixable: "code",
schema: [
{
enum: ["always", "as-needed"]
},
{
type: "object",
properties: {
requireForBlockBody: {
type: "boolean"
}
},
additionalProperties: false
}
]
},
create(context) {
const message = "Expected parentheses around arrow function argument.";
const asNeededMessage = "Unexpected parentheses around single function argument.";
const asNeeded = context.options[0] === "as-needed";
const requireForBlockBodyMessage = "Unexpected parentheses around single function argument having a body with no curly braces";
const requireForBlockBodyNoParensMessage = "Expected parentheses around arrow function argument having a body with curly braces.";
const requireForBlockBody = asNeeded && context.options[1] && context.options[1].requireForBlockBody === true;
const sourceCode = context.getSourceCode();
/**
* Determines whether a arrow function argument end with `)`
* @param {ASTNode} node The arrow function node.
* @returns {void}
*/
function parens(node) {
const token = sourceCode.getFirstToken(node, node.async ? 1 : 0);
// "as-needed", { "requireForBlockBody": true }: x => x
if (
requireForBlockBody &&
node.params.length === 1 &&
node.params[0].type === "Identifier" &&
!node.params[0].typeAnnotation &&
node.body.type !== "BlockStatement" &&
!node.returnType
) {
if (astUtils.isOpeningParenToken(token)) {
context.report({
node,
message: requireForBlockBodyMessage,
fix(fixer) {
const paramToken = context.getTokenAfter(token);
const closingParenToken = context.getTokenAfter(paramToken);
return fixer.replaceTextRange([
token.range[0],
closingParenToken.range[1]
], paramToken.value);
}
});
}
return;
}
if (
requireForBlockBody &&
node.body.type === "BlockStatement"
) {
if (!astUtils.isOpeningParenToken(token)) {
context.report({
node,
message: requireForBlockBodyNoParensMessage,
fix(fixer) {
return fixer.replaceText(token, `(${token.value})`);
}
});
}
return;
}
// "as-needed": x => x
if (asNeeded &&
node.params.length === 1 &&
node.params[0].type === "Identifier" &&
!node.params[0].typeAnnotation &&
!node.returnType
) {
if (astUtils.isOpeningParenToken(token)) {
context.report({
node,
message: asNeededMessage,
fix(fixer) {
const paramToken = context.getTokenAfter(token);
const closingParenToken = context.getTokenAfter(paramToken);
return fixer.replaceTextRange([
token.range[0],
closingParenToken.range[1]
], paramToken.value);
}
});
}
return;
}
if (token.type === "Identifier") {
const after = sourceCode.getTokenAfter(token);
// (x) => x
if (after.value !== ")") {
context.report({
node,
message,
fix(fixer) {
return fixer.replaceText(token, `(${token.value})`);
}
});
}
}
}
return {
ArrowFunctionExpression: parens
};
}
};
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