use single package.json (#6044)

Closes #6001.

assets/js/phoenix/ajax.js

@@ -53,7 +53,7 @@ export default class Ajax {
 
     try {
       return JSON.parse(resp)
-    } catch (e){
+    } catch {
       console && console.log("failed to parse JSON response", resp)
       return null
     }

eslint.config.mjs

@@ -0,0 +1,100 @@
+import jest from "eslint-plugin-jest"
+import js from "@eslint/js"
+import stylisticJs from "@stylistic/eslint-plugin-js"
+
+export default [
+  {
+    // eslint config is very unintuitive; they will match an js file in any
+    // directory by default and you can only expand this;
+    // moreover, to have a global ignore, it must be specified without
+    // any other key as a separate object...
+    ignores: [
+      "integration_test/",
+      "installer/",
+      "doc/",
+      "deps/",
+      "coverage/",
+      "priv/",
+      "tmp/",
+      "test/"
+    ],
+  },
+  {
+    ...js.configs.recommended,
+
+    plugins: {
+      jest,
+      "@stylistic/js": stylisticJs
+    },
+
+    languageOptions: {
+      globals: {
+        ...jest.environments.globals.globals,
+        global: "writable",
+      },
+
+      ecmaVersion: 12,
+      sourceType: "module",
+    },
+
+    rules: {
+      "@stylistic/js/indent": ["error", 2, {
+        SwitchCase: 1,
+      }],
+
+      "@stylistic/js/linebreak-style": ["error", "unix"],
+      "@stylistic/js/quotes": ["error", "double"],
+      "@stylistic/js/semi": ["error", "never"],
+
+      "@stylistic/js/object-curly-spacing": ["error", "never", {
+        objectsInObjects: false,
+        arraysInObjects: false,
+      }],
+
+      "@stylistic/js/array-bracket-spacing": ["error", "never"],
+
+      "@stylistic/js/comma-spacing": ["error", {
+        before: false,
+        after: true,
+      }],
+
+      "@stylistic/js/computed-property-spacing": ["error", "never"],
+
+      "@stylistic/js/space-before-blocks": ["error", {
+        functions: "never",
+        keywords: "never",
+        classes: "always",
+      }],
+
+      "@stylistic/js/keyword-spacing": ["error", {
+        overrides: {
+          if: {
+            after: false,
+          },
+
+          for: {
+            after: false,
+          },
+
+          while: {
+            after: false,
+          },
+
+          switch: {
+            after: false,
+          },
+        },
+      }],
+
+      "@stylistic/js/eol-last": ["error", "always"],
+
+      "no-unused-vars": ["error", {
+        argsIgnorePattern: "^_",
+        varsIgnorePattern: "^_",
+      }],
+
+      "no-useless-escape": "off",
+      "no-cond-assign": "off",
+      "no-case-declarations": "off",
+    },
+  }]

assets/jest.config.js → jest.config.js

@@ -23,5 +23,5 @@ module.exports = {
   },
 
   // The regexp pattern or array of patterns that Jest uses to detect test files
-  testRegex: "/test/.*_test\\.js$",
-};
+  testRegex: "/assets/test/.*_test\\.js$",
+}