76 lines
2.1 KiB
JavaScript
76 lines
2.1 KiB
JavaScript
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/**
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* @fileoverview Rule for disallowing require() outside of the top-level module context
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* @author Jamund Ferguson
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*/
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"use strict";
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const ACCEPTABLE_PARENTS = [
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"AssignmentExpression",
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"VariableDeclarator",
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"MemberExpression",
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"ExpressionStatement",
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"CallExpression",
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"ConditionalExpression",
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"Program",
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"VariableDeclaration"
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];
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/**
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* Finds the eslint-scope reference in the given scope.
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* @param {Object} scope The scope to search.
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* @param {ASTNode} node The identifier node.
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* @returns {Reference|null} Returns the found reference or null if none were found.
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*/
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function findReference(scope, node) {
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const references = scope.references.filter(reference => reference.identifier.range[0] === node.range[0] &&
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reference.identifier.range[1] === node.range[1]);
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/* istanbul ignore else: correctly returns null */
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if (references.length === 1) {
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return references[0];
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}
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return null;
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}
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/**
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* Checks if the given identifier node is shadowed in the given scope.
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* @param {Object} scope The current scope.
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* @param {ASTNode} node The identifier node to check.
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* @returns {boolean} Whether or not the name is shadowed.
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*/
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function isShadowed(scope, node) {
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const reference = findReference(scope, node);
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return reference && reference.resolved && reference.resolved.defs.length > 0;
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}
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module.exports = {
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meta: {
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docs: {
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description: "require `require()` calls to be placed at top-level module scope",
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category: "Node.js and CommonJS",
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recommended: false
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},
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schema: []
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},
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create(context) {
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return {
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CallExpression(node) {
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const currentScope = context.getScope();
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if (node.callee.name === "require" && !isShadowed(currentScope, node.callee)) {
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const isGoodRequire = context.getAncestors().every(parent => ACCEPTABLE_PARENTS.indexOf(parent.type) > -1);
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if (!isGoodRequire) {
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context.report({ node, message: "Unexpected require()." });
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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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