no-unexpected-multiline.js
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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
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "problem",
docs: {
description: "disallow confusing multiline expressions",
category: "Possible Errors",
recommended: true,
url: "https://eslint.org/docs/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.getSourceCode();
/**
* 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.start, messageId, data: { char: openParen.value } });
}
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
MemberExpression(node) {
if (!node.computed) {
return;
}
checkForBreakAfter(node.object, "property");
},
TaggedTemplateExpression(node) {
if (node.tag.loc.end.line === node.quasi.loc.start.line) {
return;
}
// handle generics type parameters on template tags
const tokenBefore = sourceCode.getTokenBefore(node.quasi);
if (tokenBefore.loc.end.line === node.quasi.loc.start.line) {
return;
}
context.report({ node, loc: node.loc.start, messageId: "taggedTemplate" });
},
CallExpression(node) {
if (node.arguments.length === 0) {
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");
}
}
};
}
};