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/** * @fileoverview Rule to flag when the same variable is declared more then once. * @author Ilya Volodin */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow variable redeclaration", recommended: true, url: "https://eslint.org/docs/latest/rules/no-redeclare" }, messages: { redeclared: "'{{id}}' is already defined.", redeclaredAsBuiltin: "'{{id}}' is already defined as a built-in global variable.", redeclaredBySyntax: "'{{id}}' is already defined by a variable declaration." }, schema: [ { type: "object", properties: { builtinGlobals: { type: "boolean", default: true } }, additionalProperties: false } ] }, create(context) { const options = { builtinGlobals: Boolean( context.options.length === 0 || context.options[0].builtinGlobals ) }; const sourceCode = context.sourceCode; /** * Iterate declarations of a given variable. * @param {escope.variable} variable The variable object to iterate declarations. * @returns {IterableIterator<{type:string,node:ASTNode,loc:SourceLocation}>} The declarations. */ function *iterateDeclarations(variable) { if (options.builtinGlobals && ( variable.eslintImplicitGlobalSetting === "readonly" || variable.eslintImplicitGlobalSetting === "writable" )) { yield { type: "builtin" }; } for (const id of variable.identifiers) { yield { type: "syntax", node: id, loc: id.loc }; } if (variable.eslintExplicitGlobalComments) { for (const comment of variable.eslintExplicitGlobalComments) { yield { type: "comment", node: comment, loc: astUtils.getNameLocationInGlobalDirectiveComment( sourceCode, comment, variable.name ) }; } } } /** * Find variables in a given scope and flag redeclared ones. * @param {Scope} scope An eslint-scope scope object. * @returns {void} * @private */ function findVariablesInScope(scope) { for (const variable of scope.variables) { const [ declaration, ...extraDeclarations ] = iterateDeclarations(variable); if (extraDeclarations.length === 0) { continue; } /* * If the type of a declaration is different from the type of * the first declaration, it shows the location of the first * declaration. */ const detailMessageId = declaration.type === "builtin" ? "redeclaredAsBuiltin" : "redeclaredBySyntax"; const data = { id: variable.name }; // Report extra declarations. for (const { type, node, loc } of extraDeclarations) { const messageId = type === declaration.type ? "redeclared" : detailMessageId; context.report({ node, loc, messageId, data }); } } } /** * Find variables in the current scope. * @param {ASTNode} node The node of the current scope. * @returns {void} * @private */ function checkForBlock(node) { const scope = sourceCode.getScope(node); /* * In ES5, some node type such as `BlockStatement` doesn't have that scope. * `scope.block` is a different node in such a case. */ if (scope.block === node) { findVariablesInScope(scope); } } return { Program(node) { const scope = sourceCode.getScope(node); findVariablesInScope(scope); // Node.js or ES modules has a special scope. if ( scope.type === "global" && scope.childScopes[0] && // The special scope's block is the Program node. scope.block === scope.childScopes[0].block ) { findVariablesInScope(scope.childScopes[0]); } }, FunctionDeclaration: checkForBlock, FunctionExpression: checkForBlock, ArrowFunctionExpression: checkForBlock, StaticBlock: checkForBlock, BlockStatement: checkForBlock, ForStatement: checkForBlock, ForInStatement: checkForBlock, ForOfStatement: checkForBlock, SwitchStatement: checkForBlock }; } };