tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/lib/rules/space-before-blocks.js b/tools/node_modules/eslint/lib/rules/space-before-blocks.js
new file mode 100644
index 0000000000..f50298c9c4
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/space-before-blocks.js
@@ -0,0 +1,148 @@
+/**
+ * @fileoverview A rule to ensure whitespace before blocks.
+ * @author Mathias Schreck <https://github.com/lo1tuma>
+ */
+
+"use strict";
+
+const astUtils = require("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "enforce consistent spacing before blocks",
+            category: "Stylistic Issues",
+            recommended: false
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        enum: ["always", "never"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            keywords: {
+                                enum: ["always", "never"]
+                            },
+                            functions: {
+                                enum: ["always", "never"]
+                            },
+                            classes: {
+                                enum: ["always", "never"]
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ]
+    },
+
+    create(context) {
+        const config = context.options[0],
+            sourceCode = context.getSourceCode();
+        let checkFunctions = true,
+            checkKeywords = true,
+            checkClasses = true;
+
+        if (typeof config === "object") {
+            checkFunctions = config.functions !== "never";
+            checkKeywords = config.keywords !== "never";
+            checkClasses = config.classes !== "never";
+        } else if (config === "never") {
+            checkFunctions = false;
+            checkKeywords = false;
+            checkClasses = false;
+        }
+
+        /**
+         * Checks whether or not a given token is an arrow operator (=>) or a keyword
+         * in order to avoid to conflict with `arrow-spacing` and `keyword-spacing`.
+         *
+         * @param {Token} token - A token to check.
+         * @returns {boolean} `true` if the token is an arrow operator.
+         */
+        function isConflicted(token) {
+            return (token.type === "Punctuator" && token.value === "=>") || token.type === "Keyword";
+        }
+
+        /**
+         * Checks the given BlockStatement node has a preceding space if it doesn’t start on a new line.
+         * @param {ASTNode|Token} node The AST node of a BlockStatement.
+         * @returns {void} undefined.
+         */
+        function checkPrecedingSpace(node) {
+            const precedingToken = sourceCode.getTokenBefore(node);
+
+            if (precedingToken && !isConflicted(precedingToken) && astUtils.isTokenOnSameLine(precedingToken, node)) {
+                const hasSpace = sourceCode.isSpaceBetweenTokens(precedingToken, node);
+                const parent = context.getAncestors().pop();
+                let requireSpace;
+
+                if (parent.type === "FunctionExpression" || parent.type === "FunctionDeclaration") {
+                    requireSpace = checkFunctions;
+                } else if (node.type === "ClassBody") {
+                    requireSpace = checkClasses;
+                } else {
+                    requireSpace = checkKeywords;
+                }
+
+                if (requireSpace) {
+                    if (!hasSpace) {
+                        context.report({
+                            node,
+                            message: "Missing space before opening brace.",
+                            fix(fixer) {
+                                return fixer.insertTextBefore(node, " ");
+                            }
+                        });
+                    }
+                } else {
+                    if (hasSpace) {
+                        context.report({
+                            node,
+                            message: "Unexpected space before opening brace.",
+                            fix(fixer) {
+                                return fixer.removeRange([precedingToken.range[1], node.range[0]]);
+                            }
+                        });
+                    }
+                }
+            }
+        }
+
+        /**
+         * Checks if the CaseBlock of an given SwitchStatement node has a preceding space.
+         * @param {ASTNode} node The node of a SwitchStatement.
+         * @returns {void} undefined.
+         */
+        function checkSpaceBeforeCaseBlock(node) {
+            const cases = node.cases;
+            let openingBrace;
+
+            if (cases.length > 0) {
+                openingBrace = sourceCode.getTokenBefore(cases[0]);
+            } else {
+                openingBrace = sourceCode.getLastToken(node, 1);
+            }
+
+            checkPrecedingSpace(openingBrace);
+        }
+
+        return {
+            BlockStatement: checkPrecedingSpace,
+            ClassBody: checkPrecedingSpace,
+            SwitchStatement: checkSpaceBeforeCaseBlock
+        };
+
+    }
+};