90 lines
2.5 KiB
JavaScript
90 lines
2.5 KiB
JavaScript
/**
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* @author Jamund Ferguson
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* See LICENSE file in root directory for full license.
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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(
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reference =>
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reference.identifier.range[0] === node.range[0] &&
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reference.identifier.range[1] === node.range[1]
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)
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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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type: "suggestion",
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docs: {
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description:
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"require `require()` calls to be placed at top-level module scope",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://github.com/weiran-zsd/eslint-plugin-node/blob/HEAD/docs/rules/global-require.md",
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},
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fixable: null,
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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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return {
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CallExpression(node) {
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const currentScope = context.getScope()
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if (
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node.callee.name === "require" &&
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!isShadowed(currentScope, node.callee)
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) {
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const isGoodRequire = context
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.getAncestors()
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.every(
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parent =>
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ACCEPTABLE_PARENTS.indexOf(parent.type) > -1
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)
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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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