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/** * @fileoverview Rule to spot scenarios where a newline looks like it is ending a statement, but is not. * @author Glen Mailer */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow confusing multiline expressions", recommended: true, url: "https://eslint.org/docs/latest/rules/no-unexpected-multiline" }, schema: [], messages: { function: "Unexpected newline between function and ( of function call.", property: "Unexpected newline between object and [ of property access.", taggedTemplate: "Unexpected newline between template tag and template literal.", division: "Unexpected newline between numerator and division operator." } }, create(context) { const REGEX_FLAG_MATCHER = /^[gimsuy]+$/u; const sourceCode = context.sourceCode; /** * Check to see if there is a newline between the node and the following open bracket * line's expression * @param {ASTNode} node The node to check. * @param {string} messageId The error messageId to use. * @returns {void} * @private */ function checkForBreakAfter(node, messageId) { const openParen = sourceCode.getTokenAfter(node, astUtils.isNotClosingParenToken); const nodeExpressionEnd = sourceCode.getTokenBefore(openParen); if (openParen.loc.start.line !== nodeExpressionEnd.loc.end.line) { context.report({ node, loc: openParen.loc, messageId }); } } //-------------------------------------------------------------------------- // Public API //-------------------------------------------------------------------------- return { MemberExpression(node) { if (!node.computed || node.optional) { return; } checkForBreakAfter(node.object, "property"); }, TaggedTemplateExpression(node) { const { quasi } = node; // handles common tags, parenthesized tags, and typescript's generic type arguments const tokenBefore = sourceCode.getTokenBefore(quasi); if (tokenBefore.loc.end.line !== quasi.loc.start.line) { context.report({ node, loc: { start: quasi.loc.start, end: { line: quasi.loc.start.line, column: quasi.loc.start.column + 1 } }, messageId: "taggedTemplate" }); } }, CallExpression(node) { if (node.arguments.length === 0 || node.optional) { return; } checkForBreakAfter(node.callee, "function"); }, "BinaryExpression[operator='/'] > BinaryExpression[operator='/'].left"(node) { const secondSlash = sourceCode.getTokenAfter(node, token => token.value === "/"); const tokenAfterOperator = sourceCode.getTokenAfter(secondSlash); if ( tokenAfterOperator.type === "Identifier" && REGEX_FLAG_MATCHER.test(tokenAfterOperator.value) && secondSlash.range[1] === tokenAfterOperator.range[0] ) { checkForBreakAfter(node.left, "division"); } } }; } };