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718 lines
27 KiB
718 lines
27 KiB
/**
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* @fileoverview Rule to flag declared but unused variables
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* @author Ilya Volodin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Typedefs
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//------------------------------------------------------------------------------
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/**
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* Bag of data used for formatting the `unusedVar` lint message.
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* @typedef {Object} UnusedVarMessageData
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* @property {string} varName The name of the unused var.
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* @property {'defined'|'assigned a value'} action Description of the vars state.
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* @property {string} additional Any additional info to be appended at the end.
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*/
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//------------------------------------------------------------------------------
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// Rule Definition
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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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type: "problem",
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docs: {
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description: "Disallow unused variables",
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recommended: true,
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url: "https://eslint.org/docs/latest/rules/no-unused-vars"
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},
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schema: [
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{
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oneOf: [
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{
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enum: ["all", "local"]
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},
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{
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type: "object",
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properties: {
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vars: {
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enum: ["all", "local"]
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},
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varsIgnorePattern: {
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type: "string"
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},
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args: {
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enum: ["all", "after-used", "none"]
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},
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ignoreRestSiblings: {
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type: "boolean"
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},
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argsIgnorePattern: {
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type: "string"
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},
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caughtErrors: {
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enum: ["all", "none"]
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},
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caughtErrorsIgnorePattern: {
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type: "string"
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},
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destructuredArrayIgnorePattern: {
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type: "string"
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}
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},
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additionalProperties: false
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}
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]
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}
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],
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messages: {
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unusedVar: "'{{varName}}' is {{action}} but never used{{additional}}."
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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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const REST_PROPERTY_TYPE = /^(?:RestElement|(?:Experimental)?RestProperty)$/u;
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const config = {
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vars: "all",
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args: "after-used",
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ignoreRestSiblings: false,
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caughtErrors: "none"
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};
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const firstOption = context.options[0];
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if (firstOption) {
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if (typeof firstOption === "string") {
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config.vars = firstOption;
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} else {
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config.vars = firstOption.vars || config.vars;
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config.args = firstOption.args || config.args;
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config.ignoreRestSiblings = firstOption.ignoreRestSiblings || config.ignoreRestSiblings;
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config.caughtErrors = firstOption.caughtErrors || config.caughtErrors;
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if (firstOption.varsIgnorePattern) {
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config.varsIgnorePattern = new RegExp(firstOption.varsIgnorePattern, "u");
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}
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if (firstOption.argsIgnorePattern) {
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config.argsIgnorePattern = new RegExp(firstOption.argsIgnorePattern, "u");
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}
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if (firstOption.caughtErrorsIgnorePattern) {
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config.caughtErrorsIgnorePattern = new RegExp(firstOption.caughtErrorsIgnorePattern, "u");
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}
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if (firstOption.destructuredArrayIgnorePattern) {
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config.destructuredArrayIgnorePattern = new RegExp(firstOption.destructuredArrayIgnorePattern, "u");
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}
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}
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}
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/**
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* Generates the message data about the variable being defined and unused,
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* including the ignore pattern if configured.
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* @param {Variable} unusedVar eslint-scope variable object.
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* @returns {UnusedVarMessageData} The message data to be used with this unused variable.
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*/
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function getDefinedMessageData(unusedVar) {
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const defType = unusedVar.defs && unusedVar.defs[0] && unusedVar.defs[0].type;
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let type;
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let pattern;
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if (defType === "CatchClause" && config.caughtErrorsIgnorePattern) {
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type = "args";
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pattern = config.caughtErrorsIgnorePattern.toString();
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} else if (defType === "Parameter" && config.argsIgnorePattern) {
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type = "args";
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pattern = config.argsIgnorePattern.toString();
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} else if (defType !== "Parameter" && config.varsIgnorePattern) {
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type = "vars";
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pattern = config.varsIgnorePattern.toString();
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}
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const additional = type ? `. Allowed unused ${type} must match ${pattern}` : "";
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return {
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varName: unusedVar.name,
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action: "defined",
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additional
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};
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}
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/**
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* Generate the warning message about the variable being
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* assigned and unused, including the ignore pattern if configured.
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* @param {Variable} unusedVar eslint-scope variable object.
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* @returns {UnusedVarMessageData} The message data to be used with this unused variable.
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*/
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function getAssignedMessageData(unusedVar) {
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const def = unusedVar.defs[0];
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let additional = "";
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if (config.destructuredArrayIgnorePattern && def && def.name.parent.type === "ArrayPattern") {
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additional = `. Allowed unused elements of array destructuring patterns must match ${config.destructuredArrayIgnorePattern.toString()}`;
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} else if (config.varsIgnorePattern) {
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additional = `. Allowed unused vars must match ${config.varsIgnorePattern.toString()}`;
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}
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return {
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varName: unusedVar.name,
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action: "assigned a value",
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additional
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};
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}
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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const STATEMENT_TYPE = /(?:Statement|Declaration)$/u;
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/**
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* Determines if a given variable is being exported from a module.
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* @param {Variable} variable eslint-scope variable object.
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* @returns {boolean} True if the variable is exported, false if not.
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* @private
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*/
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function isExported(variable) {
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const definition = variable.defs[0];
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if (definition) {
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let node = definition.node;
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if (node.type === "VariableDeclarator") {
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node = node.parent;
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} else if (definition.type === "Parameter") {
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return false;
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}
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return node.parent.type.indexOf("Export") === 0;
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}
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return false;
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}
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/**
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* Checks whether a node is a sibling of the rest property or not.
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* @param {ASTNode} node a node to check
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* @returns {boolean} True if the node is a sibling of the rest property, otherwise false.
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*/
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function hasRestSibling(node) {
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return node.type === "Property" &&
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node.parent.type === "ObjectPattern" &&
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REST_PROPERTY_TYPE.test(node.parent.properties[node.parent.properties.length - 1].type);
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}
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/**
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* Determines if a variable has a sibling rest property
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* @param {Variable} variable eslint-scope variable object.
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* @returns {boolean} True if the variable is exported, false if not.
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* @private
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*/
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function hasRestSpreadSibling(variable) {
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if (config.ignoreRestSiblings) {
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const hasRestSiblingDefinition = variable.defs.some(def => hasRestSibling(def.name.parent));
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const hasRestSiblingReference = variable.references.some(ref => hasRestSibling(ref.identifier.parent));
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return hasRestSiblingDefinition || hasRestSiblingReference;
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}
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return false;
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}
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/**
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* Determines if a reference is a read operation.
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* @param {Reference} ref An eslint-scope Reference
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* @returns {boolean} whether the given reference represents a read operation
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* @private
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*/
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function isReadRef(ref) {
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return ref.isRead();
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}
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/**
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* Determine if an identifier is referencing an enclosing function name.
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* @param {Reference} ref The reference to check.
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* @param {ASTNode[]} nodes The candidate function nodes.
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* @returns {boolean} True if it's a self-reference, false if not.
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* @private
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*/
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function isSelfReference(ref, nodes) {
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let scope = ref.from;
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while (scope) {
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if (nodes.includes(scope.block)) {
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return true;
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}
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scope = scope.upper;
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}
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return false;
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}
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/**
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* Gets a list of function definitions for a specified variable.
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* @param {Variable} variable eslint-scope variable object.
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* @returns {ASTNode[]} Function nodes.
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* @private
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*/
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function getFunctionDefinitions(variable) {
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const functionDefinitions = [];
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variable.defs.forEach(def => {
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const { type, node } = def;
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// FunctionDeclarations
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if (type === "FunctionName") {
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functionDefinitions.push(node);
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}
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// FunctionExpressions
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if (type === "Variable" && node.init &&
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(node.init.type === "FunctionExpression" || node.init.type === "ArrowFunctionExpression")) {
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functionDefinitions.push(node.init);
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}
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});
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return functionDefinitions;
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}
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/**
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* Checks the position of given nodes.
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* @param {ASTNode} inner A node which is expected as inside.
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* @param {ASTNode} outer A node which is expected as outside.
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* @returns {boolean} `true` if the `inner` node exists in the `outer` node.
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* @private
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*/
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function isInside(inner, outer) {
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return (
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inner.range[0] >= outer.range[0] &&
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inner.range[1] <= outer.range[1]
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);
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}
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/**
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* Checks whether a given node is unused expression or not.
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* @param {ASTNode} node The node itself
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* @returns {boolean} The node is an unused expression.
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* @private
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*/
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function isUnusedExpression(node) {
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const parent = node.parent;
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if (parent.type === "ExpressionStatement") {
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return true;
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}
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if (parent.type === "SequenceExpression") {
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const isLastExpression = parent.expressions[parent.expressions.length - 1] === node;
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if (!isLastExpression) {
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return true;
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}
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return isUnusedExpression(parent);
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}
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return false;
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}
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/**
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* If a given reference is left-hand side of an assignment, this gets
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* the right-hand side node of the assignment.
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*
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* In the following cases, this returns null.
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*
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* - The reference is not the LHS of an assignment expression.
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* - The reference is inside of a loop.
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* - The reference is inside of a function scope which is different from
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* the declaration.
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* @param {eslint-scope.Reference} ref A reference to check.
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* @param {ASTNode} prevRhsNode The previous RHS node.
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* @returns {ASTNode|null} The RHS node or null.
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* @private
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*/
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function getRhsNode(ref, prevRhsNode) {
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const id = ref.identifier;
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const parent = id.parent;
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const refScope = ref.from.variableScope;
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const varScope = ref.resolved.scope.variableScope;
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const canBeUsedLater = refScope !== varScope || astUtils.isInLoop(id);
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/*
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* Inherits the previous node if this reference is in the node.
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* This is for `a = a + a`-like code.
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*/
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if (prevRhsNode && isInside(id, prevRhsNode)) {
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return prevRhsNode;
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}
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if (parent.type === "AssignmentExpression" &&
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isUnusedExpression(parent) &&
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id === parent.left &&
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!canBeUsedLater
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) {
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return parent.right;
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}
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return null;
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}
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/**
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* Checks whether a given function node is stored to somewhere or not.
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* If the function node is stored, the function can be used later.
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* @param {ASTNode} funcNode A function node to check.
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* @param {ASTNode} rhsNode The RHS node of the previous assignment.
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* @returns {boolean} `true` if under the following conditions:
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* - the funcNode is assigned to a variable.
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* - the funcNode is bound as an argument of a function call.
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* - the function is bound to a property and the object satisfies above conditions.
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* @private
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*/
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function isStorableFunction(funcNode, rhsNode) {
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let node = funcNode;
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let parent = funcNode.parent;
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while (parent && isInside(parent, rhsNode)) {
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switch (parent.type) {
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case "SequenceExpression":
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if (parent.expressions[parent.expressions.length - 1] !== node) {
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return false;
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}
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break;
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case "CallExpression":
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case "NewExpression":
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return parent.callee !== node;
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case "AssignmentExpression":
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case "TaggedTemplateExpression":
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case "YieldExpression":
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return true;
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default:
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if (STATEMENT_TYPE.test(parent.type)) {
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/*
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* If it encountered statements, this is a complex pattern.
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* Since analyzing complex patterns is hard, this returns `true` to avoid false positive.
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*/
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return true;
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}
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}
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node = parent;
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parent = parent.parent;
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}
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return false;
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}
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/**
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* Checks whether a given Identifier node exists inside of a function node which can be used later.
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*
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* "can be used later" means:
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* - the function is assigned to a variable.
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* - the function is bound to a property and the object can be used later.
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* - the function is bound as an argument of a function call.
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*
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* If a reference exists in a function which can be used later, the reference is read when the function is called.
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* @param {ASTNode} id An Identifier node to check.
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* @param {ASTNode} rhsNode The RHS node of the previous assignment.
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* @returns {boolean} `true` if the `id` node exists inside of a function node which can be used later.
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* @private
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*/
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function isInsideOfStorableFunction(id, rhsNode) {
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const funcNode = astUtils.getUpperFunction(id);
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return (
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funcNode &&
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isInside(funcNode, rhsNode) &&
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isStorableFunction(funcNode, rhsNode)
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);
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}
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/**
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* Checks whether a given reference is a read to update itself or not.
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* @param {eslint-scope.Reference} ref A reference to check.
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* @param {ASTNode} rhsNode The RHS node of the previous assignment.
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* @returns {boolean} The reference is a read to update itself.
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* @private
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*/
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function isReadForItself(ref, rhsNode) {
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const id = ref.identifier;
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const parent = id.parent;
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return ref.isRead() && (
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// self update. e.g. `a += 1`, `a++`
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(
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(
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parent.type === "AssignmentExpression" &&
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parent.left === id &&
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isUnusedExpression(parent) &&
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!astUtils.isLogicalAssignmentOperator(parent.operator)
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) ||
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(
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parent.type === "UpdateExpression" &&
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isUnusedExpression(parent)
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)
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) ||
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// in RHS of an assignment for itself. e.g. `a = a + 1`
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(
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rhsNode &&
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isInside(id, rhsNode) &&
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!isInsideOfStorableFunction(id, rhsNode)
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)
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);
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}
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|
|
/**
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* Determine if an identifier is used either in for-in or for-of loops.
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|
* @param {Reference} ref The reference to check.
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* @returns {boolean} whether reference is used in the for-in loops
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* @private
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*/
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|
function isForInOfRef(ref) {
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let target = ref.identifier.parent;
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|
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// "for (var ...) { return; }"
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if (target.type === "VariableDeclarator") {
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target = target.parent.parent;
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}
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if (target.type !== "ForInStatement" && target.type !== "ForOfStatement") {
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return false;
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}
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|
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// "for (...) { return; }"
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if (target.body.type === "BlockStatement") {
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target = target.body.body[0];
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|
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// "for (...) return;"
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} else {
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target = target.body;
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}
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|
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// For empty loop body
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if (!target) {
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return false;
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}
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return target.type === "ReturnStatement";
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}
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|
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/**
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* Determines if the variable is used.
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* @param {Variable} variable The variable to check.
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* @returns {boolean} True if the variable is used
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* @private
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*/
|
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function isUsedVariable(variable) {
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const functionNodes = getFunctionDefinitions(variable),
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isFunctionDefinition = functionNodes.length > 0;
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let rhsNode = null;
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return variable.references.some(ref => {
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if (isForInOfRef(ref)) {
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return true;
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}
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const forItself = isReadForItself(ref, rhsNode);
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rhsNode = getRhsNode(ref, rhsNode);
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return (
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isReadRef(ref) &&
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!forItself &&
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!(isFunctionDefinition && isSelfReference(ref, functionNodes))
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);
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});
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}
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|
|
/**
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|
* Checks whether the given variable is after the last used parameter.
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|
* @param {eslint-scope.Variable} variable The variable to check.
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|
* @returns {boolean} `true` if the variable is defined after the last
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* used parameter.
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*/
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|
function isAfterLastUsedArg(variable) {
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const def = variable.defs[0];
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const params = sourceCode.getDeclaredVariables(def.node);
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const posteriorParams = params.slice(params.indexOf(variable) + 1);
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|
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// If any used parameters occur after this parameter, do not report.
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return !posteriorParams.some(v => v.references.length > 0 || v.eslintUsed);
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}
|
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|
|
/**
|
|
* Gets an array of variables without read references.
|
|
* @param {Scope} scope an eslint-scope Scope object.
|
|
* @param {Variable[]} unusedVars an array that saving result.
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* @returns {Variable[]} unused variables of the scope and descendant scopes.
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* @private
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*/
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function collectUnusedVariables(scope, unusedVars) {
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const variables = scope.variables;
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const childScopes = scope.childScopes;
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let i, l;
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if (scope.type !== "global" || config.vars === "all") {
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for (i = 0, l = variables.length; i < l; ++i) {
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const variable = variables[i];
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// skip a variable of class itself name in the class scope
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if (scope.type === "class" && scope.block.id === variable.identifiers[0]) {
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continue;
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}
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// skip function expression names and variables marked with markVariableAsUsed()
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if (scope.functionExpressionScope || variable.eslintUsed) {
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continue;
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}
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// skip implicit "arguments" variable
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if (scope.type === "function" && variable.name === "arguments" && variable.identifiers.length === 0) {
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continue;
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}
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// explicit global variables don't have definitions.
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const def = variable.defs[0];
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if (def) {
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const type = def.type;
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const refUsedInArrayPatterns = variable.references.some(ref => ref.identifier.parent.type === "ArrayPattern");
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// skip elements of array destructuring patterns
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if (
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(
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def.name.parent.type === "ArrayPattern" ||
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refUsedInArrayPatterns
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) &&
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config.destructuredArrayIgnorePattern &&
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config.destructuredArrayIgnorePattern.test(def.name.name)
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) {
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continue;
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}
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// skip catch variables
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if (type === "CatchClause") {
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if (config.caughtErrors === "none") {
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continue;
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}
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// skip ignored parameters
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if (config.caughtErrorsIgnorePattern && config.caughtErrorsIgnorePattern.test(def.name.name)) {
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continue;
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}
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}
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if (type === "Parameter") {
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// skip any setter argument
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if ((def.node.parent.type === "Property" || def.node.parent.type === "MethodDefinition") && def.node.parent.kind === "set") {
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continue;
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}
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// if "args" option is "none", skip any parameter
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if (config.args === "none") {
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continue;
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}
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|
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// skip ignored parameters
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if (config.argsIgnorePattern && config.argsIgnorePattern.test(def.name.name)) {
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continue;
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}
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// if "args" option is "after-used", skip used variables
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if (config.args === "after-used" && astUtils.isFunction(def.name.parent) && !isAfterLastUsedArg(variable)) {
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continue;
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}
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} else {
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|
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// skip ignored variables
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if (config.varsIgnorePattern && config.varsIgnorePattern.test(def.name.name)) {
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continue;
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}
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}
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}
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if (!isUsedVariable(variable) && !isExported(variable) && !hasRestSpreadSibling(variable)) {
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unusedVars.push(variable);
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}
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}
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}
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|
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for (i = 0, l = childScopes.length; i < l; ++i) {
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collectUnusedVariables(childScopes[i], unusedVars);
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}
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|
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return unusedVars;
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}
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
|
|
|
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return {
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"Program:exit"(programNode) {
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const unusedVars = collectUnusedVariables(sourceCode.getScope(programNode), []);
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|
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for (let i = 0, l = unusedVars.length; i < l; ++i) {
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const unusedVar = unusedVars[i];
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|
|
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// Report the first declaration.
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if (unusedVar.defs.length > 0) {
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|
|
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// report last write reference, https://github.com/eslint/eslint/issues/14324
|
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const writeReferences = unusedVar.references.filter(ref => ref.isWrite() && ref.from.variableScope === unusedVar.scope.variableScope);
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|
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let referenceToReport;
|
|
|
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if (writeReferences.length > 0) {
|
|
referenceToReport = writeReferences[writeReferences.length - 1];
|
|
}
|
|
|
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context.report({
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|
node: referenceToReport ? referenceToReport.identifier : unusedVar.identifiers[0],
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messageId: "unusedVar",
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data: unusedVar.references.some(ref => ref.isWrite())
|
|
? getAssignedMessageData(unusedVar)
|
|
: getDefinedMessageData(unusedVar)
|
|
});
|
|
|
|
// If there are no regular declaration, report the first `/*globals*/` comment directive.
|
|
} else if (unusedVar.eslintExplicitGlobalComments) {
|
|
const directiveComment = unusedVar.eslintExplicitGlobalComments[0];
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|
|
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context.report({
|
|
node: programNode,
|
|
loc: astUtils.getNameLocationInGlobalDirectiveComment(sourceCode, directiveComment, unusedVar.name),
|
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messageId: "unusedVar",
|
|
data: getDefinedMessageData(unusedVar)
|
|
});
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
};
|