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, 70 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/conf/config-schema.js b/tools/node_modules/eslint/conf/config-schema.js
new file mode 100644
index 0000000000..626e1d54c5
--- /dev/null
+++ b/tools/node_modules/eslint/conf/config-schema.js
@@ -0,0 +1,70 @@
+/**
+ * @fileoverview Defines a schema for configs.
+ * @author Sylvan Mably
+ */
+
+"use strict";
+
+const baseConfigProperties = {
+    env: { type: "object" },
+    globals: { type: "object" },
+    parser: { type: ["string", "null"] },
+    parserOptions: { type: "object" },
+    plugins: { type: "array" },
+    rules: { type: "object" },
+    settings: { type: "object" },
+
+    ecmaFeatures: { type: "object" } // deprecated; logs a warning when used
+};
+
+const overrideProperties = Object.assign(
+    {},
+    baseConfigProperties,
+    {
+        files: {
+            oneOf: [
+                { type: "string" },
+                {
+                    type: "array",
+                    items: { type: "string" },
+                    minItems: 1
+                }
+            ]
+        },
+        excludedFiles: {
+            oneOf: [
+                { type: "string" },
+                {
+                    type: "array",
+                    items: { type: "string" }
+                }
+            ]
+        }
+    }
+);
+
+const topLevelConfigProperties = Object.assign(
+    {},
+    baseConfigProperties,
+    {
+        extends: { type: ["string", "array"] },
+        root: { type: "boolean" },
+        overrides: {
+            type: "array",
+            items: {
+                type: "object",
+                properties: overrideProperties,
+                required: ["files"],
+                additionalProperties: false
+            }
+        }
+    }
+);
+
+const configSchema = {
+    type: "object",
+    properties: topLevelConfigProperties,
+    additionalProperties: false
+};
+
+module.exports = configSchema;