[gnome-shell] lint: Import eslint rules from gjs

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 3731be9947960368c028afdd3cd7fb682625041b
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Jan 27 00:15:39 2019 +0100

    lint: Import eslint rules from gjs
    
    gjs started to run eslint during its CI a while ago, so there is an
    existing rules set we can use as a starting point for our own setup.
    
    As we will adapt those rules to our code base, we don't want those
    changes to make it harder to synchronize the copy with future gjs
    changes, so include the rules from a separate file rather than using
    the configuration directly.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/609

 .eslintrc.json         |   5 ++
 lint/eslintrc-gjs.json | 130 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 135 insertions(+)
---
diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 000000000..255b0f2f8
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,5 @@
+{
+    "extends": [
+        "./lint/eslintrc-gjs.json"
+    ]
+}
diff --git a/lint/eslintrc-gjs.json b/lint/eslintrc-gjs.json
new file mode 100644
index 000000000..74cadf263
--- /dev/null
+++ b/lint/eslintrc-gjs.json
@@ -0,0 +1,130 @@
+{
+    "env": {
+        "es6": true
+    },
+    "extends": "eslint:recommended",
+    "rules": {
+        "array-bracket-newline": [
+            "error",
+            "consistent"
+        ],
+        "array-bracket-spacing": [
+            "error",
+            "never"
+        ],
+        "arrow-spacing": "error",
+        "brace-style": "error",
+        "comma-spacing": [
+            "error",
+            {
+                "before": false,
+                "after": true
+            }
+        ],
+        "indent": [
+            "error",
+            4,
+            {
+                "ignoredNodes": [
+                    "CallExpression[callee.object.name=GObject][callee.property.name=registerClass] > 
ClassExpression:first-child"
+                ],
+                "MemberExpression": "off"
+            }
+        ],
+        "key-spacing": [
+            "error",
+            {
+                "beforeColon": false,
+                "afterColon": true
+            }
+        ],
+        "keyword-spacing": [
+            "error",
+            {
+                "before": true,
+                "after": true
+            }
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "no-empty": [
+            "error",
+            {
+                "allowEmptyCatch": true
+            }
+        ],
+        "no-implicit-coercion": [
+            "error",
+            {
+                "allow": ["!!"]
+            }
+        ],
+        "no-restricted-properties": [
+            "error",
+            {
+                "object": "Lang",
+                "property": "bind",
+                "message": "Use arrow notation or Function.prototype.bind()"
+            },
+            {
+                "object": "Lang",
+                "property": "Class",
+                "message": "Use ES6 classes"
+            }
+        ],
+        "nonblock-statement-body-position": [
+            "error",
+            "below"
+        ],
+        "object-curly-newline": [
+            "error",
+            {
+                "consistent": true
+            }
+        ],
+        "object-curly-spacing": "error",
+        "prefer-template": "error",
+        "quotes": [
+            "error",
+            "single",
+            {
+                "avoidEscape": true
+            }
+        ],
+        "semi": [
+            "error",
+            "always"
+        ],
+        "semi-spacing": [
+            "error",
+            {
+                "before": false,
+                "after": true
+            }
+        ],
+        "space-before-blocks": "error",
+        "space-infix-ops": [
+            "error",
+            {
+                "int32Hint": false
+            }
+        ]
+    },
+    "globals": {
+        "ARGV": false,
+        "Debugger": false,
+        "GIRepositoryGType": false,
+        "imports": false,
+        "Intl": false,
+        "log": false,
+        "logError": false,
+        "print": false,
+        "printerr": false,
+        "window": false
+    },
+    "parserOptions": {
+        "ecmaVersion": 2017
+    }
+}