81 lines
2.4 KiB
JavaScript
81 lines
2.4 KiB
JavaScript
/**
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* @fileoverview Rule to disallow an empty pattern
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* @author Alberto Rodríguez
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*/
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"use strict";
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "problem",
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defaultOptions: [{
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allowObjectPatternsAsParameters: false
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}],
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docs: {
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description: "Disallow empty destructuring patterns",
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recommended: true,
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url: "https://eslint.org/docs/latest/rules/no-empty-pattern"
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},
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schema: [
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{
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type: "object",
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properties: {
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allowObjectPatternsAsParameters: {
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type: "boolean"
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}
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},
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additionalProperties: false
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}
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],
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messages: {
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unexpected: "Unexpected empty {{type}} pattern."
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}
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},
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create(context) {
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const [{ allowObjectPatternsAsParameters }] = context.options;
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return {
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ObjectPattern(node) {
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if (node.properties.length > 0) {
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return;
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}
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// Allow {} and {} = {} empty object patterns as parameters when allowObjectPatternsAsParameters is true
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if (
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allowObjectPatternsAsParameters &&
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(
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astUtils.isFunction(node.parent) ||
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(
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node.parent.type === "AssignmentPattern" &&
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astUtils.isFunction(node.parent.parent) &&
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node.parent.right.type === "ObjectExpression" &&
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node.parent.right.properties.length === 0
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)
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)
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) {
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return;
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}
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context.report({ node, messageId: "unexpected", data: { type: "object" } });
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},
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ArrayPattern(node) {
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if (node.elements.length === 0) {
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context.report({ node, messageId: "unexpected", data: { type: "array" } });
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}
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}
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};
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}
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};
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