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accessor-pairs.js
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array-element-newline.js
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arrow-body-style.js
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complexity.js
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getter-return.js
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grouped-accessor-pairs.js
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guard-for-in.js
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implicit-arrow-linebreak.js
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jsx-quotes.js
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no-duplicate-imports.js
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no-else-return.js
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no-empty-function.js
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Code Editor : array-callback-return.js
/** * @fileoverview Rule to enforce return statements in callbacks of array's methods * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const TARGET_NODE_TYPE = /^(?:Arrow)?FunctionExpression$/u; const TARGET_METHODS = /^(?:every|filter|find(?:Last)?(?:Index)?|flatMap|forEach|map|reduce(?:Right)?|some|sort|toSorted)$/u; /** * Checks a given node is a member access which has the specified name's * property. * @param {ASTNode} node A node to check. * @returns {boolean} `true` if the node is a member access which has * the specified name's property. The node may be a `(Chain|Member)Expression` node. */ function isTargetMethod(node) { return astUtils.isSpecificMemberAccess(node, null, TARGET_METHODS); } /** * Checks all segments in a set and returns true if any are reachable. * @param {Set<CodePathSegment>} segments The segments to check. * @returns {boolean} True if any segment is reachable; false otherwise. */ function isAnySegmentReachable(segments) { for (const segment of segments) { if (segment.reachable) { return true; } } return false; } /** * Returns a human-legible description of an array method * @param {string} arrayMethodName A method name to fully qualify * @returns {string} the method name prefixed with `Array.` if it is a class method, * or else `Array.prototype.` if it is an instance method. */ function fullMethodName(arrayMethodName) { if (["from", "of", "isArray"].includes(arrayMethodName)) { return "Array.".concat(arrayMethodName); } return "Array.prototype.".concat(arrayMethodName); } /** * Checks whether or not a given node is a function expression which is the * callback of an array method, returning the method name. * @param {ASTNode} node A node to check. This is one of * FunctionExpression or ArrowFunctionExpression. * @returns {string} The method name if the node is a callback method, * null otherwise. */ function getArrayMethodName(node) { let currentNode = node; while (currentNode) { const parent = currentNode.parent; switch (parent.type) { /* * Looks up the destination. e.g., * foo.every(nativeFoo || function foo() { ... }); */ case "LogicalExpression": case "ConditionalExpression": case "ChainExpression": currentNode = parent; break; /* * If the upper function is IIFE, checks the destination of the return value. * e.g. * foo.every((function() { * // setup... * return function callback() { ... }; * })()); */ case "ReturnStatement": { const func = astUtils.getUpperFunction(parent); if (func === null || !astUtils.isCallee(func)) { return null; } currentNode = func.parent; break; } /* * e.g. * Array.from([], function() {}); * list.every(function() {}); */ case "CallExpression": if (astUtils.isArrayFromMethod(parent.callee)) { if ( parent.arguments.length >= 2 && parent.arguments[1] === currentNode ) { return "from"; } } if (isTargetMethod(parent.callee)) { if ( parent.arguments.length >= 1 && parent.arguments[0] === currentNode ) { return astUtils.getStaticPropertyName(parent.callee); } } return null; // Otherwise this node is not target. default: return null; } } /* c8 ignore next */ return null; } /** * Checks if the given node is a void expression. * @param {ASTNode} node The node to check. * @returns {boolean} - `true` if the node is a void expression */ function isExpressionVoid(node) { return node.type === "UnaryExpression" && node.operator === "void"; } /** * Fixes the linting error by prepending "void " to the given node * @param {Object} sourceCode context given by context.sourceCode * @param {ASTNode} node The node to fix. * @param {Object} fixer The fixer object provided by ESLint. * @returns {Array<Object>} - An array of fix objects to apply to the node. */ function voidPrependFixer(sourceCode, node, fixer) { const requiresParens = // prepending `void ` will fail if the node has a lower precedence than void astUtils.getPrecedence(node) < astUtils.getPrecedence({ type: "UnaryExpression", operator: "void" }) && // check if there are parentheses around the node to avoid redundant parentheses !astUtils.isParenthesised(sourceCode, node); // avoid parentheses issues const returnOrArrowToken = sourceCode.getTokenBefore( node, node.parent.type === "ArrowFunctionExpression" ? astUtils.isArrowToken // isReturnToken : token => token.type === "Keyword" && token.value === "return" ); const firstToken = sourceCode.getTokenAfter(returnOrArrowToken); const prependSpace = // is return token, as => allows void to be adjacent returnOrArrowToken.value === "return" && // If two tokens (return and "(") are adjacent returnOrArrowToken.range[1] === firstToken.range[0]; return [ fixer.insertTextBefore(firstToken, `${prependSpace ? " " : ""}void ${requiresParens ? "(" : ""}`), fixer.insertTextAfter(node, requiresParens ? ")" : "") ]; } /** * Fixes the linting error by `wrapping {}` around the given node's body. * @param {Object} sourceCode context given by context.sourceCode * @param {ASTNode} node The node to fix. * @param {Object} fixer The fixer object provided by ESLint. * @returns {Array<Object>} - An array of fix objects to apply to the node. */ function curlyWrapFixer(sourceCode, node, fixer) { const arrowToken = sourceCode.getTokenBefore(node.body, astUtils.isArrowToken); const firstToken = sourceCode.getTokenAfter(arrowToken); const lastToken = sourceCode.getLastToken(node); return [ fixer.insertTextBefore(firstToken, "{"), fixer.insertTextAfter(lastToken, "}") ]; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Enforce `return` statements in callbacks of array methods", recommended: false, url: "https://eslint.org/docs/latest/rules/array-callback-return" }, // eslint-disable-next-line eslint-plugin/require-meta-has-suggestions -- false positive hasSuggestions: true, schema: [ { type: "object", properties: { allowImplicit: { type: "boolean", default: false }, checkForEach: { type: "boolean", default: false }, allowVoid: { type: "boolean", default: false } }, additionalProperties: false } ], messages: { expectedAtEnd: "{{arrayMethodName}}() expects a value to be returned at the end of {{name}}.", expectedInside: "{{arrayMethodName}}() expects a return value from {{name}}.", expectedReturnValue: "{{arrayMethodName}}() expects a return value from {{name}}.", expectedNoReturnValue: "{{arrayMethodName}}() expects no useless return value from {{name}}.", wrapBraces: "Wrap the expression in `{}`.", prependVoid: "Prepend `void` to the expression." } }, create(context) { const options = context.options[0] || { allowImplicit: false, checkForEach: false, allowVoid: false }; const sourceCode = context.sourceCode; let funcInfo = { arrayMethodName: null, upper: null, codePath: null, hasReturn: false, shouldCheck: false, node: null }; /** * Checks whether or not the last code path segment is reachable. * Then reports this function if the segment is reachable. * * If the last code path segment is reachable, there are paths which are not * returned or thrown. * @param {ASTNode} node A node to check. * @returns {void} */ function checkLastSegment(node) { if (!funcInfo.shouldCheck) { return; } const messageAndSuggestions = { messageId: "", suggest: [] }; if (funcInfo.arrayMethodName === "forEach") { if (options.checkForEach && node.type === "ArrowFunctionExpression" && node.expression) { if (options.allowVoid) { if (isExpressionVoid(node.body)) { return; } messageAndSuggestions.messageId = "expectedNoReturnValue"; messageAndSuggestions.suggest = [ { messageId: "wrapBraces", fix(fixer) { return curlyWrapFixer(sourceCode, node, fixer); } }, { messageId: "prependVoid", fix(fixer) { return voidPrependFixer(sourceCode, node.body, fixer); } } ]; } else { messageAndSuggestions.messageId = "expectedNoReturnValue"; messageAndSuggestions.suggest = [{ messageId: "wrapBraces", fix(fixer) { return curlyWrapFixer(sourceCode, node, fixer); } }]; } } } else { if (node.body.type === "BlockStatement" && isAnySegmentReachable(funcInfo.currentSegments)) { messageAndSuggestions.messageId = funcInfo.hasReturn ? "expectedAtEnd" : "expectedInside"; } } if (messageAndSuggestions.messageId) { const name = astUtils.getFunctionNameWithKind(node); context.report({ node, loc: astUtils.getFunctionHeadLoc(node, sourceCode), messageId: messageAndSuggestions.messageId, data: { name, arrayMethodName: fullMethodName(funcInfo.arrayMethodName) }, suggest: messageAndSuggestions.suggest.length !== 0 ? messageAndSuggestions.suggest : null }); } } return { // Stacks this function's information. onCodePathStart(codePath, node) { let methodName = null; if (TARGET_NODE_TYPE.test(node.type)) { methodName = getArrayMethodName(node); } funcInfo = { arrayMethodName: methodName, upper: funcInfo, codePath, hasReturn: false, shouldCheck: methodName && !node.async && !node.generator, node, currentSegments: new Set() }; }, // Pops this function's information. onCodePathEnd() { funcInfo = funcInfo.upper; }, onUnreachableCodePathSegmentStart(segment) { funcInfo.currentSegments.add(segment); }, onUnreachableCodePathSegmentEnd(segment) { funcInfo.currentSegments.delete(segment); }, onCodePathSegmentStart(segment) { funcInfo.currentSegments.add(segment); }, onCodePathSegmentEnd(segment) { funcInfo.currentSegments.delete(segment); }, // Checks the return statement is valid. ReturnStatement(node) { if (!funcInfo.shouldCheck) { return; } funcInfo.hasReturn = true; const messageAndSuggestions = { messageId: "", suggest: [] }; if (funcInfo.arrayMethodName === "forEach") { // if checkForEach: true, returning a value at any path inside a forEach is not allowed if (options.checkForEach && node.argument) { if (options.allowVoid) { if (isExpressionVoid(node.argument)) { return; } messageAndSuggestions.messageId = "expectedNoReturnValue"; messageAndSuggestions.suggest = [{ messageId: "prependVoid", fix(fixer) { return voidPrependFixer(sourceCode, node.argument, fixer); } }]; } else { messageAndSuggestions.messageId = "expectedNoReturnValue"; } } } else { // if allowImplicit: false, should also check node.argument if (!options.allowImplicit && !node.argument) { messageAndSuggestions.messageId = "expectedReturnValue"; } } if (messageAndSuggestions.messageId) { context.report({ node, messageId: messageAndSuggestions.messageId, data: { name: astUtils.getFunctionNameWithKind(funcInfo.node), arrayMethodName: fullMethodName(funcInfo.arrayMethodName) }, suggest: messageAndSuggestions.suggest.length !== 0 ? messageAndSuggestions.suggest : null }); } }, // Reports a given function if the last path is reachable. "FunctionExpression:exit": checkLastSegment, "ArrowFunctionExpression:exit": checkLastSegment }; } };
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