2 * @fileoverview Restrict usage of specified node modules.
3 * @author Christian Schulz
7 //------------------------------------------------------------------------------
9 //------------------------------------------------------------------------------
11 const ignore = require("ignore");
13 const arrayOfStrings = {
15 items: { type: "string" },
19 const arrayOfStringsOrObjects = {
27 name: { type: "string" },
33 additionalProperties: false,
50 description: "disallow specified modules when loaded by `require`",
51 category: "Node.js and CommonJS",
53 url: "https://eslint.org/docs/rules/no-restricted-modules"
58 arrayOfStringsOrObjects,
64 paths: arrayOfStringsOrObjects,
65 patterns: arrayOfStrings
67 additionalProperties: false
69 additionalItems: false
75 defaultMessage: "'{{name}}' module is restricted from being used.",
76 // eslint-disable-next-line eslint-plugin/report-message-format
77 customMessage: "'{{name}}' module is restricted from being used. {{customMessage}}",
78 patternMessage: "'{{name}}' module is restricted from being used by a pattern."
83 const options = Array.isArray(context.options) ? context.options : [];
84 const isPathAndPatternsObject =
85 typeof options[0] === "object" &&
86 (Object.prototype.hasOwnProperty.call(options[0], "paths") || Object.prototype.hasOwnProperty.call(options[0], "patterns"));
88 const restrictedPaths = (isPathAndPatternsObject ? options[0].paths : context.options) || [];
89 const restrictedPatterns = (isPathAndPatternsObject ? options[0].patterns : []) || [];
91 const restrictedPathMessages = restrictedPaths.reduce((memo, importName) => {
92 if (typeof importName === "string") {
93 memo[importName] = null;
95 memo[importName.name] = importName.message;
100 // if no imports are restricted we don"t need to check
101 if (Object.keys(restrictedPaths).length === 0 && restrictedPatterns.length === 0) {
105 const ig = ignore().add(restrictedPatterns);
109 * Function to check if a node is a string literal.
110 * @param {ASTNode} node The node to check.
111 * @returns {boolean} If the node is a string literal.
113 function isStringLiteral(node) {
114 return node && node.type === "Literal" && typeof node.value === "string";
118 * Function to check if a node is a static string template literal.
119 * @param {ASTNode} node The node to check.
120 * @returns {boolean} If the node is a string template literal.
122 function isStaticTemplateLiteral(node) {
123 return node && node.type === "TemplateLiteral" && node.expressions.length === 0;
127 * Function to check if a node is a require call.
128 * @param {ASTNode} node The node to check.
129 * @returns {boolean} If the node is a require call.
131 function isRequireCall(node) {
132 return node.callee.type === "Identifier" && node.callee.name === "require";
136 * Extract string from Literal or TemplateLiteral node
137 * @param {ASTNode} node The node to extract from
138 * @returns {string|null} Extracted string or null if node doesn't represent a string
140 function getFirstArgumentString(node) {
141 if (isStringLiteral(node)) {
142 return node.value.trim();
145 if (isStaticTemplateLiteral(node)) {
146 return node.quasis[0].value.cooked.trim();
153 * Report a restricted path.
154 * @param {node} node representing the restricted path reference
155 * @param {string} name restricted path
159 function reportPath(node, name) {
160 const customMessage = restrictedPathMessages[name];
161 const messageId = customMessage
176 * Check if the given name is a restricted path name
177 * @param {string} name name of a variable
178 * @returns {boolean} whether the variable is a restricted path or not
181 function isRestrictedPath(name) {
182 return Object.prototype.hasOwnProperty.call(restrictedPathMessages, name);
186 CallExpression(node) {
187 if (isRequireCall(node)) {
189 // node has arguments
190 if (node.arguments.length) {
191 const name = getFirstArgumentString(node.arguments[0]);
193 // if first argument is a string literal or a static string template literal
196 // check if argument value is in restricted modules array
197 if (isRestrictedPath(name)) {
198 reportPath(node, name);
201 if (restrictedPatterns.length > 0 && ig.ignores(name)) {
204 messageId: "patternMessage",