chore: Add prettier and eslint (#633)

* chore: add eslint

* chore: add prettier

.eslintignore

@@ -0,0 +1 @@
+vendor/axs_testing.js

.eslintrc.json

@@ -0,0 +1,38 @@
+{
+  "extends": "standard",
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "env": {
+    "browser": true
+  },
+  "rules": {
+    "semi": ["error", "always"],
+    "no-var": "error",
+    "no-unused-vars": 0,
+    "no-global-assign": 0,
+    "guard-for-in": 2,
+    "space-before-function-paren": 0,
+    "@typescript-eslint/no-unused-vars": ["error", {
+      "vars": "all",
+      "args": "after-used",
+      "ignoreRestSiblings": false
+    }],
+    "prefer-const": ["error", {
+      "destructuring": "all"
+    }],
+    "standard/no-callback-literal": "off",
+    "node/no-deprecated-api": 0
+  },
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  },
+  "overrides": [
+    {
+      "files": "*.d.ts",
+      "rules": {
+          "no-useless-constructor": "off"
+      }
+    }
+  ]
+}

.prettierignore

@@ -0,0 +1 @@
+vendor/axs_testing.js

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "trailingComma": "none",
+  "tabWidth": 2,
+  "singleQuote": true,
+  "endOfLine": "lf"
+}

index.js

@@ -1 +1 @@
-exports.Application = require('./lib/application')
+exports.Application = require('./lib/application');

lib/accessibility.js

@@ -1,61 +1,72 @@
-var axsPath = require.resolve('../vendor/axs_testing')
+const axsPath = require.resolve('../vendor/axs_testing');
 
 exports.addCommand = function (client, requireName) {
   client.addCommand('auditAccessibility', function (options) {
-    return this.execute(function (axsPath, requireName, options) {
-      options = options || {}
-      var ignoreWarnings = options.ignoreWarnings || false
-      var ignoreRules = Array.isArray(options.ignoreRules) ? options.ignoreRules : []
+    return this.execute(
+      function (axsPath, requireName, options) {
+        options = options || {};
+        const ignoreWarnings = options.ignoreWarnings || false;
+        const ignoreRules = Array.isArray(options.ignoreRules)
+          ? options.ignoreRules
+          : [];
 
-      var axs = window[requireName](axsPath)
-      var audit = axs.Audit.run(new axs.AuditConfiguration({
-        showUnsupportedRulesWarning: false
-      }))
+        const axs = window[requireName](axsPath);
+        const audit = axs.Audit.run(
+          new axs.AuditConfiguration({
+            showUnsupportedRulesWarning: false
+          })
+        );
 
-      var failures = audit.filter(function (result) {
-        return result.result === 'FAIL'
-      })
+        let failures = audit.filter(function (result) {
+          return result.result === 'FAIL';
+        });
 
-      if (ignoreWarnings) {
-        failures = failures.filter(function (result) {
-          return result.rule.severity !== 'Warning'
-        })
-      }
+        if (ignoreWarnings) {
+          failures = failures.filter(function (result) {
+            return result.rule.severity !== 'Warning';
+          });
+        }
 
-      failures = failures.filter(function (result) {
-        return ignoreRules.indexOf(result.rule.code) === -1
-      })
+        failures = failures.filter(function (result) {
+          return ignoreRules.indexOf(result.rule.code) === -1;
+        });
 
-      if (failures.length > 0) {
-        var message = 'Accessibilty audit failed\n\n'
-        message += failures.map(function (result) {
-          return axs.Audit.accessibilityErrorMessage(result)
-        }).join('\n\n')
+        if (failures.length > 0) {
+          let message = 'Accessibilty audit failed\n\n';
+          message += failures
+            .map(function (result) {
+              return axs.Audit.accessibilityErrorMessage(result);
+            })
+            .join('\n\n');
 
-        return {
-          message: message,
-          failed: true,
-          results: failures.map(function (result) {
-            return {
-              code: result.rule.code,
-              elements: result.elements.map(function (element) {
-                return axs.utils.getQuerySelectorText(element)
-              }),
-              message: result.rule.heading,
-              severity: result.rule.severity,
-              url: result.rule.url
-            }
-          })
-        }
-      } else {
-        return {
-          message: 'Accessibilty audit passed',
-          results: [],
-          failed: false
+          return {
+            message: message,
+            failed: true,
+            results: failures.map(function (result) {
+              return {
+                code: result.rule.code,
+                elements: result.elements.map(function (element) {
+                  return axs.utils.getQuerySelectorText(element);
+                }),
+                message: result.rule.heading,
+                severity: result.rule.severity,
+                url: result.rule.url
+              };
+            })
+          };
+        } else {
+          return {
+            message: 'Accessibilty audit passed',
+            results: [],
+            failed: false
+          };
         }
-      }
-    }, axsPath, requireName, options).then(function (response) {
-      return response
-    })
-  })
-}
+      },
+      axsPath,
+      requireName,
+      options
+    ).then(function (response) {
+      return response;
+    });
+  });
+};