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/**
* @fileoverview Rule to flag wrapping non-iife in parens
* @author Gyandeep Singh
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Checks whether or not a given node is an `Identifier` node which was named a given name.
* @param {ASTNode} node - A node to check.
* @param {string} name - An expected name of the node.
* @returns {boolean} `true` if the node is an `Identifier` node which was named as expected.
*/
function isIdentifier(node, name) {
return node.type === "Identifier" && node.name === name;
}
/**
* Checks whether or not a given node is an argument of a specified method call.
* @param {ASTNode} node - A node to check.
* @param {number} index - An expected index of the node in arguments.
* @param {string} object - An expected name of the object of the method.
* @param {string} property - An expected name of the method.
* @returns {boolean} `true` if the node is an argument of the specified method call.
*/
function isArgumentOfMethodCall(node, index, object, property) {
const parent = node.parent;
return (
parent.type === "CallExpression" &&
parent.callee.type === "MemberExpression" &&
parent.callee.computed === false &&
isIdentifier(parent.callee.object, object) &&
isIdentifier(parent.callee.property, property) &&
parent.arguments[index] === node
);
}
/**
* Checks whether or not a given node is a property descriptor.
* @param {ASTNode} node - A node to check.
* @returns {boolean} `true` if the node is a property descriptor.
*/
function isPropertyDescriptor(node) {
// Object.defineProperty(obj, "foo", {set: ...})
if (isArgumentOfMethodCall(node, 2, "Object", "defineProperty") ||
isArgumentOfMethodCall(node, 2, "Reflect", "defineProperty")
) {
return true;
}
/*
* Object.defineProperties(obj, {foo: {set: ...}})
* Object.create(proto, {foo: {set: ...}})
*/
const grandparent = node.parent.parent;
return grandparent.type === "ObjectExpression" && (
isArgumentOfMethodCall(grandparent, 1, "Object", "create") ||
isArgumentOfMethodCall(grandparent, 1, "Object", "defineProperties")
);
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "enforce getter and setter pairs in objects",
category: "Best Practices",
recommended: false,
url: "https://eslint.org/docs/rules/accessor-pairs"
},
schema: [{
type: "object",
properties: {
getWithoutSet: {
type: "boolean",
default: false
},
setWithoutGet: {
type: "boolean",
default: true
}
},
additionalProperties: false
}],
messages: {
getter: "Getter is not present.",
setter: "Setter is not present."
}
},
create(context) {
const config = context.options[0] || {};
const checkGetWithoutSet = config.getWithoutSet === true;
const checkSetWithoutGet = config.setWithoutGet !== false;
/**
* Checks a object expression to see if it has setter and getter both present or none.
* @param {ASTNode} node The node to check.
* @returns {void}
* @private
*/
function checkLonelySetGet(node) {
let isSetPresent = false;
let isGetPresent = false;
const isDescriptor = isPropertyDescriptor(node);
for (let i = 0, end = node.properties.length; i < end; i++) {
const property = node.properties[i];
let propToCheck = "";
if (property.kind === "init") {
if (isDescriptor && !property.computed) {
propToCheck = property.key.name;
}
} else {
propToCheck = property.kind;
}
switch (propToCheck) {
case "set":
isSetPresent = true;
break;
case "get":
isGetPresent = true;
break;
default:
// Do nothing
}
if (isSetPresent && isGetPresent) {
break;
}
}
if (checkSetWithoutGet && isSetPresent && !isGetPresent) {
context.report({ node, messageId: "getter" });
} else if (checkGetWithoutSet && isGetPresent && !isSetPresent) {
context.report({ node, messageId: "setter" });
}
}
return {
ObjectExpression(node) {
if (checkSetWithoutGet || checkGetWithoutSet) {
checkLonelySetGet(node);
}
}
};
}
};