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