You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.9 KiB
93 lines
2.9 KiB
/**
|
|
* @fileoverview A rule to warn against using arrow functions when they could be
|
|
* confused with comparisons
|
|
* @author Jxck <https://github.com/Jxck>
|
|
* @deprecated in ESLint v8.53.0
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
const astUtils = require("./utils/ast-utils.js");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helpers
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Checks whether or not a node is a conditional expression.
|
|
* @param {ASTNode} node node to test
|
|
* @returns {boolean} `true` if the node is a conditional expression.
|
|
*/
|
|
function isConditional(node) {
|
|
return node && node.type === "ConditionalExpression";
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
deprecated: true,
|
|
replacedBy: [],
|
|
type: "suggestion",
|
|
|
|
docs: {
|
|
description: "Disallow arrow functions where they could be confused with comparisons",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/rules/no-confusing-arrow"
|
|
},
|
|
|
|
fixable: "code",
|
|
|
|
schema: [{
|
|
type: "object",
|
|
properties: {
|
|
allowParens: { type: "boolean", default: true },
|
|
onlyOneSimpleParam: { type: "boolean", default: false }
|
|
},
|
|
additionalProperties: false
|
|
}],
|
|
|
|
messages: {
|
|
confusing: "Arrow function used ambiguously with a conditional expression."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
const config = context.options[0] || {};
|
|
const allowParens = config.allowParens || (config.allowParens === void 0);
|
|
const onlyOneSimpleParam = config.onlyOneSimpleParam;
|
|
const sourceCode = context.sourceCode;
|
|
|
|
|
|
/**
|
|
* Reports if an arrow function contains an ambiguous conditional.
|
|
* @param {ASTNode} node A node to check and report.
|
|
* @returns {void}
|
|
*/
|
|
function checkArrowFunc(node) {
|
|
const body = node.body;
|
|
|
|
if (isConditional(body) &&
|
|
!(allowParens && astUtils.isParenthesised(sourceCode, body)) &&
|
|
!(onlyOneSimpleParam && !(node.params.length === 1 && node.params[0].type === "Identifier"))) {
|
|
context.report({
|
|
node,
|
|
messageId: "confusing",
|
|
fix(fixer) {
|
|
|
|
// if `allowParens` is not set to true don't bother wrapping in parens
|
|
return allowParens && fixer.replaceText(node.body, `(${sourceCode.getText(node.body)})`);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
return {
|
|
ArrowFunctionExpression: checkArrowFunc
|
|
};
|
|
}
|
|
};
|