1 files changed, 98 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-unexpected-multiline.js b/tools/node_modules/eslint/lib/rules/no-unexpected-multiline.js
new file mode 100644
index 0000000000..9398b8a603
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-unexpected-multiline.js
@@ -0,0 +1,98 @@
+/**
+ * @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("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow confusing multiline expressions",
+            category: "Possible Errors",
+            recommended: true
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+        const FUNCTION_MESSAGE = "Unexpected newline between function and ( of function call.";
+        const PROPERTY_MESSAGE = "Unexpected newline between object and [ of property access.";
+        const TAGGED_TEMPLATE_MESSAGE = "Unexpected newline between template tag and template literal.";
+        const DIVISION_MESSAGE = "Unexpected newline between numerator and division operator.";
+
+        const REGEX_FLAG_MATCHER = /^[gimuy]+$/;
+
+        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} msg The error message to use.
+         * @returns {void}
+         * @private
+         */
+        function checkForBreakAfter(node, msg) {
+            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, message: msg, data: { char: openParen.value } });
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+
+            MemberExpression(node) {
+                if (!node.computed) {
+                    return;
+                }
+                checkForBreakAfter(node.object, PROPERTY_MESSAGE);
+            },
+
+            TaggedTemplateExpression(node) {
+                if (node.tag.loc.end.line === node.quasi.loc.start.line) {
+                    return;
+                }
+                context.report({ node, loc: node.loc.start, message: TAGGED_TEMPLATE_MESSAGE });
+            },
+
+            CallExpression(node) {
+                if (node.arguments.length === 0) {
+                    return;
+                }
+                checkForBreakAfter(node.callee, FUNCTION_MESSAGE);
+            },
+
+            "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_MESSAGE);
+                }
+            }
+        };
+
+    }
+};