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