allow linting of .js files and added tests for eslint config

scm-ui/eslint-config/src/__resources__/Node.js

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+var path = require('path')
+console.log('we do not use path')

scm-ui/eslint-config/src/__resources__/Typescript.ts

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+const path = require('path');
+console.log("from typscript");

scm-ui/eslint-config/src/__resources__/TypescriptWithJsx.tsx

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+console.log('from Sample.tsx')

scm-ui/eslint-config/src/index.js

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+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+module.exports = {
+  parser: "@typescript-eslint/parser",
+  env: {
+    node: false,
+    browser: true
+  },
+  extends: ["react-app", "plugin:prettier/recommended", "plugin:@typescript-eslint/recommended"],
+  rules: {
+    "prettier/prettier": "warn",
+    semi: ["error", "always"],
+    quotes: ["error", "double", "avoid-escape"],
+    "jsx-a11y/href-no-hash": [0],
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/ban-ts-ignore": "warn",
+    "no-console": "error"
+  },
+  overrides: [
+    {
+      files: ["*.js"],
+      env: {
+        node: true,
+        browser: false
+      }
+    }
+  ]
+};

scm-ui/eslint-config/src/index.test.js

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+const { ESLint } = require("eslint");
+const path = require("path");
+
+describe("should lint files", () => {
+  const eslint = new ESLint();
+  const resource = path.join(__dirname, "__resources__");
+
+  const lint = async file => {
+    const results = await eslint.lintFiles([path.join(resource, file)]);
+
+    const messages = results[0].messages;
+
+    const warnings = messages.filter(m => m.severity === 1).map(m => m.ruleId);
+    const errors = messages.filter(m => m.severity === 2).map(m => m.ruleId);
+    return {
+      errors,
+      warnings
+    };
+  };
+
+  const expectContains = (results, ...ids) => {
+    for (const id of ids) {
+      expect(results).toContain(id);
+    }
+  }
+
+  it("should lint tsx files", async () => {
+    const { errors, warnings } = await lint("TypescriptWithJsx.tsx");
+    expectContains(errors, "no-console", "quotes", "semi");
+    expectContains(warnings, "prettier/prettier");
+  });
+
+  it("should lint js files", async () => {
+    const { errors, warnings } = await lint("Node.js");
+    expectContains(errors, "no-var", "no-console", "quotes", "semi");
+    expectContains(warnings, "prettier/prettier");
+  });
+
+  it("should lint ts files", async () => {
+    const { errors, warnings } = await lint("Typescript.ts");
+    expectContains(errors, "no-console", "quotes");
+    expectContains(warnings, "prettier/prettier");
+  });
+});