86 lines
2.0 KiB
JavaScript
86 lines
2.0 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('../types').Rule.RuleModule} */
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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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{
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allowObjectPatternsAsParameters: false,
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},
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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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(astUtils.isFunction(node.parent) ||
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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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return;
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}
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context.report({
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node,
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messageId: 'unexpected',
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data: { type: 'object' },
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});
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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({
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node,
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messageId: 'unexpected',
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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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};
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