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90 lines
2.4 KiB
90 lines
2.4 KiB
/**
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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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* @deprecated in ESLint v7.0.0
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*/
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"use strict";
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const ACCEPTABLE_PARENTS = new Set([
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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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"ChainExpression"
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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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if (references.length === 1) {
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return references[0];
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}
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/* c8 ignore next */
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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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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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deprecated: true,
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replacedBy: [],
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type: "suggestion",
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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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recommended: false,
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url: "https://eslint.org/docs/latest/rules/global-require"
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},
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schema: [],
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messages: {
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unexpected: "Unexpected require()."
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}
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},
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create(context) {
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const sourceCode = context.sourceCode;
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return {
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CallExpression(node) {
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const currentScope = sourceCode.getScope(node);
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if (node.callee.name === "require" && !isShadowed(currentScope, node.callee)) {
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const isGoodRequire = sourceCode.getAncestors(node).every(parent => ACCEPTABLE_PARENTS.has(parent.type));
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if (!isGoodRequire) {
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context.report({ node, messageId: "unexpected" });
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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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