Rollup merge of #109052 - GuillaumeGomez:rustdoc-gui-tester-eslint, r=notriddle

Add eslint check for rustdoc-gui tester

r? `@notriddle`

src/ci/docker/host-x86_64/mingw-check/Dockerfile

@@ -53,4 +53,5 @@ ENV SCRIPT python3 ../x.py --stage 2 test src/tools/expand-yaml-anchors && \
            # Runs checks to ensure that there are no ES5 issues in our JS code.
            es-check es6 ../src/librustdoc/html/static/js/*.js && \
            eslint -c ../src/librustdoc/html/static/.eslintrc.js ../src/librustdoc/html/static/js/*.js && \
-           eslint -c ../src/tools/rustdoc-js/.eslintrc.js ../src/tools/rustdoc-js/tester.js
+           eslint -c ../src/tools/rustdoc-js/.eslintrc.js ../src/tools/rustdoc-js/tester.js && \
+           eslint -c ../src/tools/rustdoc-gui/.eslintrc.js ../src/tools/rustdoc-gui/tester.js

src/tools/rustdoc-gui/.eslintrc.js

@@ -0,0 +1,96 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "node": true,
+        "es6": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 2018,
+        "sourceType": "module"
+    },
+    "rules": {
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ],
+        "quotes": [
+            "error",
+            "double"
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "no-trailing-spaces": "error",
+        "no-var": ["error"],
+        "prefer-const": ["error"],
+        "prefer-arrow-callback": ["error"],
+        "brace-style": [
+            "error",
+            "1tbs",
+            { "allowSingleLine": false }
+        ],
+        "keyword-spacing": [
+            "error",
+            { "before": true, "after": true }
+        ],
+        "arrow-spacing": [
+            "error",
+            { "before": true, "after": true }
+        ],
+        "key-spacing": [
+            "error",
+            { "beforeColon": false, "afterColon": true, "mode": "strict" }
+        ],
+        "func-call-spacing": ["error", "never"],
+        "space-infix-ops": "error",
+        "space-before-function-paren": ["error", "never"],
+        "space-before-blocks": "error",
+        "comma-dangle": ["error", "always-multiline"],
+        "comma-style": ["error", "last"],
+        "max-len": ["error", { "code": 100, "tabWidth": 4 }],
+        "eol-last": ["error", "always"],
+        "arrow-parens": ["error", "as-needed"],
+        "no-unused-vars": [
+            "error",
+            {
+                "argsIgnorePattern": "^_",
+                "varsIgnorePattern": "^_"
+            }
+        ],
+        "eqeqeq": "error",
+        "no-const-assign": "error",
+        "no-debugger": "error",
+        "no-dupe-args": "error",
+        "no-dupe-else-if": "error",
+        "no-dupe-keys": "error",
+        "no-duplicate-case": "error",
+        "no-ex-assign": "error",
+        "no-fallthrough": "error",
+        "no-invalid-regexp": "error",
+        "no-import-assign": "error",
+        "no-self-compare": "error",
+        "no-template-curly-in-string": "error",
+        "block-scoped-var": "error",
+        "guard-for-in": "error",
+        "no-alert": "error",
+        "no-confusing-arrow": "error",
+        "no-div-regex": "error",
+        "no-floating-decimal": "error",
+        "no-implicit-globals": "error",
+        "no-implied-eval": "error",
+        "no-label-var": "error",
+        "no-lonely-if": "error",
+        "no-mixed-operators": "error",
+        "no-multi-assign": "error",
+        "no-return-assign": "error",
+        "no-script-url": "error",
+        "no-sequences": "error",
+        "no-div-regex": "error",
+    }
+};

src/tools/rustdoc-gui/tester.js

@@ -6,8 +6,8 @@
 
 const fs = require("fs");
 const path = require("path");
-const os = require('os');
-const {Options, runTest} = require('browser-ui-test');
+const os = require("os");
+const {Options, runTest} = require("browser-ui-test");
 
 // If a test fails or errors, we will retry it two more times in case it was a flaky failure.
 const NB_RETRY = 3;
@@ -200,7 +200,7 @@ async function main(argv) {
     const framework_options = new Options();
     try {
         // This is more convenient that setting fields one by one.
-        let args = [
+        const args = [
             "--variable", "DOC_PATH", opts["doc_folder"], "--enable-fail-on-js-error",
             "--allow-file-access-from-files",
         ];
@@ -234,7 +234,7 @@ async function main(argv) {
     } else {
         files = opts["files"];
     }
-    files = files.filter(file => path.extname(file) == ".goml");
+    files = files.filter(file => path.extname(file) === ".goml");
     if (files.length === 0) {
         console.error("rustdoc-gui: No test selected");
         process.exit(2);
@@ -259,7 +259,7 @@ async function main(argv) {
 
     // We catch this "event" to display a nicer message in case of unexpected exit (because of a
     // missing `--no-sandbox`).
-    const exitHandling = (code) => {
+    const exitHandling = () => {
         if (!opts["no_sandbox"]) {
             console.log("");
             console.log(
@@ -268,10 +268,10 @@ async function main(argv) {
             console.log("");
         }
     };
-    process.on('exit', exitHandling);
+    process.on("exit", exitHandling);
 
     const originalFilesLen = files.length;
-    let results = createEmptyResults();
+    const results = createEmptyResults();
     const status_bar = char_printer(files.length);
 
     let new_results;
@@ -281,7 +281,7 @@ async function main(argv) {
         Array.prototype.push.apply(results.successful, new_results.successful);
         // We generate the new list of files with the previously failing tests.
         files = Array.prototype.concat(new_results.failed, new_results.errored).map(
-            f => f['file_name']);
+            f => f["file_name"]);
         if (files.length > originalFilesLen / 2) {
             // If we have too many failing tests, it's very likely not flaky failures anymore so
             // no need to retry.