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rules
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utils/
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Edit:
/home/techb158/balavpn.abdallabala.com/node_modules/eslint/lib/rules/prefer-arrow-callback.js
(11667B)
/** * @fileoverview A rule to suggest using arrow functions as callbacks. * @author Toru Nagashima */ "use strict"; const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Checks whether or not a given variable is a function name. * @param {eslint-scope.Variable} variable A variable to check. * @returns {boolean} `true` if the variable is a function name. */ function isFunctionName(variable) { return variable && variable.defs[0].type === "FunctionName"; } /** * Checks whether or not a given MetaProperty node equals to a given value. * @param {ASTNode} node A MetaProperty node to check. * @param {string} metaName The name of `MetaProperty.meta`. * @param {string} propertyName The name of `MetaProperty.property`. * @returns {boolean} `true` if the node is the specific value. */ function checkMetaProperty(node, metaName, propertyName) { return node.meta.name === metaName && node.property.name === propertyName; } /** * Gets the variable object of `arguments` which is defined implicitly. * @param {eslint-scope.Scope} scope A scope to get. * @returns {eslint-scope.Variable} The found variable object. */ function getVariableOfArguments(scope) { const variables = scope.variables; for (let i = 0; i < variables.length; ++i) { const variable = variables[i]; if (variable.name === "arguments") { /* * If there was a parameter which is named "arguments", the * implicit "arguments" is not defined. * So does fast return with null. */ return variable.identifiers.length === 0 ? variable : null; } } /* c8 ignore next */ return null; } /** * Checks whether or not a given node is a callback. * @param {ASTNode} node A node to check. * @throws {Error} (Unreachable.) * @returns {Object} * {boolean} retv.isCallback - `true` if the node is a callback. * {boolean} retv.isLexicalThis - `true` if the node is with `.bind(this)`. */ function getCallbackInfo(node) { const retv = { isCallback: false, isLexicalThis: false }; let currentNode = node; let parent = node.parent; let bound = false; while (currentNode) { switch (parent.type) { // Checks parents recursively. case "LogicalExpression": case "ChainExpression": case "ConditionalExpression": break; // Checks whether the parent node is `.bind(this)` call. case "MemberExpression": if ( parent.object === currentNode && !parent.property.computed && parent.property.type === "Identifier" && parent.property.name === "bind" ) { const maybeCallee = parent.parent.type === "ChainExpression" ? parent.parent : parent; if (astUtils.isCallee(maybeCallee)) { if (!bound) { bound = true; // Use only the first `.bind()` to make `isLexicalThis` value. retv.isLexicalThis = maybeCallee.parent.arguments.length === 1 && maybeCallee.parent.arguments[0].type === "ThisExpression"; } parent = maybeCallee.parent; } else { return retv; } } else { return retv; } break; // Checks whether the node is a callback. case "CallExpression": case "NewExpression": if (parent.callee !== currentNode) { retv.isCallback = true; } return retv; default: return retv; } currentNode = parent; parent = parent.parent; } /* c8 ignore next */ throw new Error("unreachable"); } /** * Checks whether a simple list of parameters contains any duplicates. This does not handle complex * parameter lists (e.g. with destructuring), since complex parameter lists are a SyntaxError with duplicate * parameter names anyway. Instead, it always returns `false` for complex parameter lists. * @param {ASTNode[]} paramsList The list of parameters for a function * @returns {boolean} `true` if the list of parameters contains any duplicates */ function hasDuplicateParams(paramsList) { return ( paramsList.every(param => param.type === "Identifier") && paramsList.length !== new Set(paramsList.map(param => param.name)).size ); } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "suggestion", dialects: ["javascript", "typescript"], language: "javascript", defaultOptions: [ { allowNamedFunctions: false, allowUnboundThis: true }, ], docs: { description: "Require using arrow functions for callbacks", recommended: false, frozen: true, url: "https://eslint.org/docs/latest/rules/prefer-arrow-callback", }, schema: [ { type: "object", properties: { allowNamedFunctions: { type: "boolean", }, allowUnboundThis: { type: "boolean", }, }, additionalProperties: false, }, ], fixable: "code", messages: { preferArrowCallback: "Unexpected function expression.", }, }, create(context) { const [{ allowNamedFunctions, allowUnboundThis }] = context.options; const sourceCode = context.sourceCode; /* * {Array<{this: boolean, super: boolean, meta: boolean}>} * - this - A flag which shows there are one or more ThisExpression. * - super - A flag which shows there are one or more Super. * - meta - A flag which shows there are one or more MethProperty. */ let stack = []; /** * Pushes new function scope with all `false` flags. * @returns {void} */ function enterScope() { stack.push({ this: false, super: false, meta: false }); } /** * Pops a function scope from the stack. * @returns {{this: boolean, super: boolean, meta: boolean}} The information of the last scope. */ function exitScope() { return stack.pop(); } return { // Reset internal state. Program() { stack = []; }, // If there are below, it cannot replace with arrow functions merely. ThisExpression() { const info = stack.at(-1); if (info) { info.this = true; } }, Super() { const info = stack.at(-1); if (info) { info.super = true; } }, MetaProperty(node) { const info = stack.at(-1); if (info && checkMetaProperty(node, "new", "target")) { info.meta = true; } }, // To skip nested scopes. FunctionDeclaration: enterScope, "FunctionDeclaration:exit": exitScope, // Main. FunctionExpression: enterScope, "FunctionExpression:exit"(node) { const scopeInfo = exitScope(); // Skip named function expressions if (allowNamedFunctions && node.id && node.id.name) { return; } // Skip generators. if (node.generator) { return; } // Skip recursive functions. const nameVar = sourceCode.getDeclaredVariables(node)[0]; if (isFunctionName(nameVar) && nameVar.references.length > 0) { return; } // Skip if it's using arguments. const variable = getVariableOfArguments( sourceCode.getScope(node), ); if (variable && variable.references.length > 0) { return; } // Reports if it's a callback which can replace with arrows. const callbackInfo = getCallbackInfo(node); if ( callbackInfo.isCallback && (!allowUnboundThis || !scopeInfo.this || callbackInfo.isLexicalThis) && !scopeInfo.super && !scopeInfo.meta ) { context.report({ node, messageId: "preferArrowCallback", *fix(fixer) { if ( (!callbackInfo.isLexicalThis && scopeInfo.this) || hasDuplicateParams(node.params) ) { /* * If the callback function does not have .bind(this) and contains a reference to `this`, there * is no way to determine what `this` should be, so don't perform any fixes. * If the callback function has duplicates in its list of parameters (possible in sloppy mode), * don't replace it with an arrow function, because this is a SyntaxError with arrow functions. */ return; } if ( node.params.length && node.params[0].name === "this" ) { return; } // Remove `.bind(this)` if exists. if (callbackInfo.isLexicalThis) { const memberNode = node.parent; /* * If `.bind(this)` exists but the parent is not `.bind(this)`, don't remove it automatically. * E.g. `(foo || function(){}).bind(this)` */ if (memberNode.type !== "MemberExpression") { return; } const callNode = memberNode.parent; const firstTokenToRemove = sourceCode.getTokenAfter( memberNode.object, astUtils.isNotClosingParenToken, ); const lastTokenToRemove = sourceCode.getLastToken(callNode); /* * If the member expression is parenthesized, don't remove the right paren. * E.g. `(function(){}.bind)(this)` * ^^^^^^^^^^^^ */ if ( astUtils.isParenthesised( sourceCode, memberNode, ) ) { return; } // If comments exist in the `.bind(this)`, don't remove those. if ( sourceCode.commentsExistBetween( firstTokenToRemove, lastTokenToRemove, ) ) { return; } yield fixer.removeRange([ firstTokenToRemove.range[0], lastTokenToRemove.range[1], ]); } // Convert the function expression to an arrow function. const functionToken = sourceCode.getFirstToken( node, node.async ? 1 : 0, ); const leftParenToken = sourceCode.getTokenAfter( functionToken, astUtils.isOpeningParenToken, ); const tokenBeforeBody = sourceCode.getTokenBefore( node.body, ); if ( sourceCode.commentsExistBetween( functionToken, leftParenToken, ) ) { // Remove only extra tokens to keep comments. yield fixer.remove(functionToken); if (node.id) { yield fixer.remove(node.id); } } else { // Remove extra tokens and spaces. yield fixer.removeRange([ functionToken.range[0], leftParenToken.range[0], ]); } yield fixer.insertTextAfter(tokenBeforeBody, " =>"); // Get the node that will become the new arrow function. let replacedNode = callbackInfo.isLexicalThis ? node.parent.parent : node; if (replacedNode.type === "ChainExpression") { replacedNode = replacedNode.parent; } /* * If the replaced node is part of a BinaryExpression, LogicalExpression, or MemberExpression, then * the arrow function needs to be parenthesized, because `foo || () => {}` is invalid syntax even * though `foo || function() {}` is valid. */ if ( replacedNode.parent.type !== "CallExpression" && replacedNode.parent.type !== "ConditionalExpression" && !astUtils.isParenthesised( sourceCode, replacedNode, ) && !astUtils.isParenthesised(sourceCode, node) ) { yield fixer.insertTextBefore(replacedNode, "("); yield fixer.insertTextAfter(replacedNode, ")"); } }, }); } }, }; }, };
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