/
no-nullish-coalescing-operators.js
46 lines (43 loc) · 1.36 KB
/
no-nullish-coalescing-operators.js
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/**
* @author Yosuke Ota <https://github.com/ota-meshi>
* See LICENSE file in root directory for full license.
*/
"use strict"
const { getSourceCode } = require("eslint-compat-utils")
/**
* Checks if the given token is a nullish coalescing operator or not.
* @param {Token} token - The token to check.
* @returns {boolean} `true` if the token is a nullish coalescing operator.
*/
function isNullishCoalescingOperator(token) {
return token.value === "??" && token.type === "Punctuator"
}
module.exports = {
meta: {
docs: {
description: "disallow nullish coalescing operators.",
category: "ES2020",
recommended: false,
url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-nullish-coalescing-operators.html",
},
fixable: null,
messages: {
forbidden: "ES2020 nullish coalescing operators are forbidden.",
},
schema: [],
type: "problem",
},
create(context) {
return {
"LogicalExpression[operator='??']"(node) {
context.report({
node: getSourceCode(context).getTokenAfter(
node.left,
isNullishCoalescingOperator,
),
messageId: "forbidden",
})
},
}
},
}