diff --git a/.eslintignore b/.eslintignore
index de4d1f007..18f2b36db 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,2 +1,3 @@
+coverage
 dist
 node_modules
diff --git a/.eslintrc.js b/.eslintrc.js
index a64a864fa..960fc6e08 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -2,11 +2,13 @@ module.exports = {
   root: true,
   parser: '@typescript-eslint/parser',
   parserOptions: {
-    tsconfigRootDir: __dirname, // this is the reason this is a .js file
-    project: ['./tsconfig.json', './test/tsconfig.json'],
+    tsconfigRootDir: __dirname,
+    project: [ './tsconfig.json', './test/tsconfig.json' ],
   },
-  globals:  {
+  globals: {
+    // eslint-disable-next-line @typescript-eslint/naming-convention
     AsyncIterable: 'readonly',
+    // eslint-disable-next-line @typescript-eslint/naming-convention
     NodeJS: 'readonly',
   },
   plugins: [
@@ -23,81 +25,105 @@ module.exports = {
   ],
   settings: {
     'import/resolver': {
-      'typescript': {
-        'alwaysTryTypes': true // always try to resolve types under `<root>@types` directory even it doesn't contain any source code, like `@types/rdf-js`
+      typescript: {
+        // Always try to resolve types under `<root>@types` directory
+        // even it doesn't contain any source code, like `@types/rdf-js`
+        alwaysTryTypes: true,
       },
-    }
+    },
   },
   rules: {
-    '@typescript-eslint/consistent-type-definitions': 'off', // there are valid typing reasons to have one or the other
+    // There are valid typing reasons to have one or the other
+    '@typescript-eslint/consistent-type-definitions': 'off',
     '@typescript-eslint/lines-between-class-members': [ 'error', { exceptAfterSingleLine: true }],
     '@typescript-eslint/no-empty-interface': 'off',
-    '@typescript-eslint/no-invalid-void-type': 'off', // breaks with default void in Asynchandler 2nd generic
-    '@typescript-eslint/no-unnecessary-condition': 'off', // problems with optional parameters
+    // Breaks with default void in AsyncHandler 2nd generic
+    '@typescript-eslint/no-invalid-void-type': 'off',
+    // Problems with optional parameters
+    '@typescript-eslint/no-unnecessary-condition': 'off',
     '@typescript-eslint/space-before-function-paren': [ 'error', 'never' ],
     '@typescript-eslint/unbound-method': 'off',
     '@typescript-eslint/unified-signatures': 'off',
-    'class-methods-use-this': 'off', // conflicts with functions from interfaces that sometimes don't require `this`
-    'comma-dangle': ['error', 'always-multiline'],
-    'dot-location': ['error', 'property'],
-    'generator-star-spacing': ['error', 'after'],
-    'lines-around-comment': 'off', // conflicts with padded-blocks
-    'lines-between-class-members': ['error', 'always', { exceptAfterSingleLine: true }],
-    'max-len': ['error', { code: 120, ignoreUrls: true }],
-    'new-cap': 'off', // used for RDF constants
-    'no-param-reassign': 'off', // necessary in constructor overloading
-    'no-underscore-dangle': 'off', // conflicts with external libraries
-    'no-unused-vars': 'off', // already checked by @typescript-eslint/no-unused-vars
+    // Conflicts with functions from interfaces that sometimes don't require `this`
+    'class-methods-use-this': 'off',
+    'comma-dangle': [ 'error', 'always-multiline' ],
+    'dot-location': [ 'error', 'property' ],
+    'generator-star-spacing': [ 'error', 'after' ],
+    // Conflicts with padded-blocks
+    'lines-around-comment': 'off',
+    'lines-between-class-members': [ 'error', 'always', { exceptAfterSingleLine: true }],
+    'max-len': [ 'error', { code: 120, ignoreUrls: true }],
+    // Used for RDF constants
+    'new-cap': 'off',
+    // Necessary in constructor overloading
+    'no-param-reassign': 'off',
+    // Conflicts with external libraries
+    'no-underscore-dangle': 'off',
+    // Already checked by @typescript-eslint/no-unused-vars
+    'no-unused-vars': 'off',
     'padding-line-between-statements': 'off',
     'prefer-named-capture-group': 'off',
+    // Already generated by TypeScript
+    strict: 'off',
     'tsdoc/syntax': 'error',
     'unicorn/catch-error-name': 'off',
     'unicorn/import-index': 'off',
     'unicorn/import-style': 'off',
-    'unicorn/no-fn-reference-in-iterator': 'off', // this prevents some functional programming paradigms
+    // This prevents some functional programming paradigms
+    'unicorn/no-fn-reference-in-iterator': 'off',
     'unicorn/no-object-as-default-parameter': 'off',
     'unicorn/numeric-separators-style': 'off',
-    'unicorn/prefer-ternary': 'off', // can get ugly with large single statements
-    'yield-star-spacing': ['error', 'after'],
+    // Can get ugly with large single statements
+    'unicorn/prefer-ternary': 'off',
+    'yield-star-spacing': [ 'error', 'after' ],
 
     // Naming conventions
     '@typescript-eslint/naming-convention': [
       'error',
       {
         selector: 'default',
-        format: ['camelCase'],
+        format: [ 'camelCase' ],
         leadingUnderscore: 'forbid',
         trailingUnderscore: 'forbid',
       },
       {
         selector: 'variable',
-        format: ['camelCase', 'UPPER_CASE'],
+        format: [ 'camelCase', 'UPPER_CASE' ],
         leadingUnderscore: 'forbid',
         trailingUnderscore: 'forbid',
       },
       {
         selector: 'typeLike',
-        format: ['PascalCase'],
+        format: [ 'PascalCase' ],
       },
       {
         selector: [ 'typeParameter' ],
         format: [ 'PascalCase' ],
         prefix: [ 'T' ],
-      }
+      },
     ],
 
     // Import
-    '@typescript-eslint/consistent-type-imports': ['error', { prefer: 'type-imports' }],
-    'sort-imports': 'off', // Disabled in favor of eslint-plugin-import
-    'import/order': ['error', {
+    '@typescript-eslint/consistent-type-imports': [ 'error', { prefer: 'type-imports' }],
+    // Disabled in favor of eslint-plugin-import
+    'sort-imports': 'off',
+    'import/order': [ 'error', {
       alphabetize: {
         order: 'asc',
         caseInsensitive: true,
-      }
+      },
     }],
     'import/no-duplicates': 'error',
     'import/no-extraneous-dependencies': 'error',
-    'no-duplicate-imports': 'off', // doesn't work with type imports
+    // Doesn't work with type imports
+    'no-duplicate-imports': 'off',
     'unused-imports/no-unused-imports-ts': 'error',
   },
+
+  overrides: [
+    {
+      files: '*.js',
+      parser: 'espree',
+    },
+  ],
 };
diff --git a/bin/server.js b/bin/server.js
index afaf57966..dcfa789f7 100755
--- a/bin/server.js
+++ b/bin/server.js
@@ -1,3 +1,3 @@
 #!/usr/bin/env node
-const { runCli } = require("..");
+const { runCli } = require('..');
 runCli();
diff --git a/jest.config.js b/jest.config.js
index 49758e919..de130e245 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,32 +1,33 @@
 module.exports = {
-  "globals": {
-    "ts-jest": {
-      "tsconfig": "tsconfig.json"
-    }
+  globals: {
+    'ts-jest': {
+      tsconfig: 'tsconfig.json',
+    },
   },
-  "transform": {
-    "^.+\\.ts$": "ts-jest"
+  transform: {
+    '^.+\\.ts$': 'ts-jest',
   },
-  "testRegex": "/test/(unit|integration)/.*\\.test\\.ts$",
-  "moduleFileExtensions": [
-    "ts",
-    "js"
+  testRegex: '/test/(unit|integration)/.*\\.test\\.ts$',
+  moduleFileExtensions: [
+    'ts',
+    'js',
   ],
-  "testEnvironment": "node",
-  "setupFilesAfterEnv": ["jest-rdf", "<rootDir>/test/util/SetupTests.ts"],
-  "collectCoverage": true,
-  "coveragePathIgnorePatterns": [
-    "/dist/",
-    "/node_modules/",
-    "/test/"
+  testEnvironment: 'node',
+  setupFilesAfterEnv: [ 'jest-rdf', '<rootDir>/test/util/SetupTests.ts' ],
+  collectCoverage: true,
+  coveragePathIgnorePatterns: [
+    '/dist/',
+    '/node_modules/',
+    '/test/',
   ],
-  "coverageThreshold": {
-    "./src": {
-      "branches": 100,
-      "functions": 100,
-      "lines": 100,
-      "statements": 100
-    }
+  coverageThreshold: {
+    './src': {
+      branches: 100,
+      functions: 100,
+      lines: 100,
+      statements: 100,
+    },
   },
-  "testTimeout": 10000, // Slower machines had problems calling the WebSocket integration callbacks on time
+  // Slower machines had problems calling the WebSocket integration callbacks on time
+  testTimeout: 10000,
 };
diff --git a/package.json b/package.json
index 016dfa8a6..fe7e530bc 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "docker:start": "./test/docker/docker-start.sh",
     "docker:stop": "./test/docker/docker-stop.sh",
     "jest": "jest",
-    "lint": "eslint . --ext .ts --cache",
+    "lint": "eslint . --cache",
     "prepare": "npm run build",
     "start": "node ./bin/server.js -p 3000",
     "test": "npm run test:tsc && npm run jest",