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/**
* @fileoverview Rule to suggest using "Reflect" api over Function/Object methods
* @author Keith Cirkel <http://keithcirkel.co.uk>
* @deprecated in ESLint v3.9.0
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "require `Reflect` methods where applicable",
category: "ECMAScript 6",
recommended: false,
url: "https://eslint.org/docs/rules/prefer-reflect"
},
deprecated: true,
replacedBy: [],
schema: [
{
type: "object",
properties: {
exceptions: {
type: "array",
items: {
enum: [
"apply",
"call",
"delete",
"defineProperty",
"getOwnPropertyDescriptor",
"getPrototypeOf",
"setPrototypeOf",
"isExtensible",
"getOwnPropertyNames",
"preventExtensions"
]
},
uniqueItems: true
}
},
additionalProperties: false
}
]
},
create(context) {
const existingNames = {
apply: "Function.prototype.apply",
call: "Function.prototype.call",
defineProperty: "Object.defineProperty",
getOwnPropertyDescriptor: "Object.getOwnPropertyDescriptor",
getPrototypeOf: "Object.getPrototypeOf",
setPrototypeOf: "Object.setPrototypeOf",
isExtensible: "Object.isExtensible",
getOwnPropertyNames: "Object.getOwnPropertyNames",
preventExtensions: "Object.preventExtensions"
};
const reflectSubsitutes = {
apply: "Reflect.apply",
call: "Reflect.apply",
defineProperty: "Reflect.defineProperty",
getOwnPropertyDescriptor: "Reflect.getOwnPropertyDescriptor",
getPrototypeOf: "Reflect.getPrototypeOf",
setPrototypeOf: "Reflect.setPrototypeOf",
isExtensible: "Reflect.isExtensible",
getOwnPropertyNames: "Reflect.getOwnPropertyNames",
preventExtensions: "Reflect.preventExtensions"
};
const exceptions = (context.options[0] || {}).exceptions || [];
/**
* Reports the Reflect violation based on the `existing` and `substitute`
* @param {Object} node The node that violates the rule.
* @param {string} existing The existing method name that has been used.
* @param {string} substitute The Reflect substitute that should be used.
* @returns {void}
*/
function report(node, existing, substitute) {
context.report({
node,
message: "Avoid using {{existing}}, instead use {{substitute}}.",
data: {
existing,
substitute
}
});
}
return {
CallExpression(node) {
const methodName = (node.callee.property || {}).name;
const isReflectCall = (node.callee.object || {}).name === "Reflect";
const hasReflectSubsitute = Object.prototype.hasOwnProperty.call(reflectSubsitutes, methodName);
const userConfiguredException = exceptions.indexOf(methodName) !== -1;
if (hasReflectSubsitute && !isReflectCall && !userConfiguredException) {
report(node, existingNames[methodName], reflectSubsitutes[methodName]);
}
},
UnaryExpression(node) {
const isDeleteOperator = node.operator === "delete";
const targetsIdentifier = node.argument.type === "Identifier";
const userConfiguredException = exceptions.indexOf("delete") !== -1;
if (isDeleteOperator && !targetsIdentifier && !userConfiguredException) {
report(node, "the delete keyword", "Reflect.deleteProperty");
}
}
};
}
};