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/**
* @fileoverview Rule for disallowing require() outside of the top-level module context
* @author Jamund Ferguson
* @deprecated in ESLint v7.0.0
*/
"use strict";
const ACCEPTABLE_PARENTS = new Set([
"AssignmentExpression",
"VariableDeclarator",
"MemberExpression",
"ExpressionStatement",
"CallExpression",
"ConditionalExpression",
"Program",
"VariableDeclaration",
"ChainExpression",
]);
/**
* Finds the eslint-scope reference in the given scope.
* @param {Object} scope The scope to search.
* @param {ASTNode} node The identifier node.
* @returns {Reference|null} Returns the found reference or null if none were found.
*/
function findReference(scope, node) {
const references = scope.references.filter(
reference =>
reference.identifier.range[0] === node.range[0] &&
reference.identifier.range[1] === node.range[1],
);
if (references.length === 1) {
return references[0];
}
/* c8 ignore next */
return null;
}
/**
* Checks if the given identifier node is shadowed in the given scope.
* @param {Object} scope The current scope.
* @param {ASTNode} node The identifier node to check.
* @returns {boolean} Whether or not the name is shadowed.
*/
function isShadowed(scope, node) {
const reference = findReference(scope, node);
return (
reference && reference.resolved && reference.resolved.defs.length > 0
);
}
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
deprecated: {
message: "Node.js rules were moved out of ESLint core.",
url: "https://eslint.org/docs/latest/use/migrating-to-7.0.0#deprecate-node-rules",
deprecatedSince: "7.0.0",
availableUntil: null,
replacedBy: [
{
message:
"eslint-plugin-n now maintains deprecated Node.js-related rules.",
plugin: {
name: "eslint-plugin-n",
url: "https://github.com/eslint-community/eslint-plugin-n",
},
rule: {
name: "global-require",
url: "https://github.com/eslint-community/eslint-plugin-n/tree/master/docs/rules/global-require.md",
},
},
],
},
type: "suggestion",
docs: {
description:
"Require `require()` calls to be placed at top-level module scope",
recommended: false,
url: "https://eslint.org/docs/latest/rules/global-require",
},
schema: [],
messages: {
unexpected: "Unexpected require().",
},
},
create(context) {
const sourceCode = context.sourceCode;
return {
CallExpression(node) {
const currentScope = sourceCode.getScope(node);
if (
node.callee.name === "require" &&
!isShadowed(currentScope, node.callee)
) {
const isGoodRequire = sourceCode
.getAncestors(node)
.every(parent => ACCEPTABLE_PARENTS.has(parent.type));
if (!isGoodRequire) {
context.report({ node, messageId: "unexpected" });
}
}
},
};
},
};