Ensure no extension is defined in .ts files

.eslintrc.yaml

@@ -1,42 +1,52 @@
-{
-  root: true,
-  extends: [
-    'openlayers',
-    '.eslintrc-es6.yaml'
-  ],
-  rules: {
-    no-console: 0,
-    comma-dangle: 0,
-    no-extra-boolean-cast: 0,
-    brace-style: 0,
-    prefer-template: 0,
-    no-multiple-empty-lines: 0,
-    valid-jsdoc: 0,
-    indent: [2, 2, {
-      VariableDeclarator: 2,
-      SwitchCase: 1,
-      MemberExpression: 2,
-      FunctionDeclaration: {
-        parameters: 2,
-        body: 1
-      },
-      FunctionExpression: {
-        parameters: 2,
-        body: 1
-      },
-      CallExpression: {
-        arguments: 2
-      }
+root: true
+extends:
+  - openlayers
+  - .eslintrc-es6.yaml
+  - plugin:import/recommended
+  - plugin:import/typescript
+settings:
+  import/resolver:
+    # You will also need to install and configure the TypeScript resolver
+    # See also https://github.com/import-js/eslint-import-resolver-typescript#configuration
+    typescript: true
+    node: true
+rules:
+  no-console: 0
+  comma-dangle: 0
+  no-extra-boolean-cast: 0
+  brace-style: 0
+  prefer-template: 0
+  no-multiple-empty-lines: 0
+  valid-jsdoc: 0
+  indent: [2, 2, {
+    VariableDeclarator: 2,
+    SwitchCase: 1,
+    MemberExpression: 2,
+    FunctionDeclaration: {
+      parameters: 2,
+      body: 1
+    },
+    FunctionExpression: {
+      parameters: 2,
+      body: 1
+    },
+    CallExpression: {
+      arguments: 2
+    }
     }]
-  },
-  overrides: [{
-  "files": [ "examples/*.js" ],
-  "rules": {
-    "import/no-unresolved": 0
-  }
-}],
-  globals: {
-    webpack: false,
-    Cesium: false
-  }
-}
+overrides:
+  - files: [ "examples/*.js" ]
+    rules:
+      import/no-unresolved: 0
+  - files: ['*.ts']
+    rules:
+      import/extensions: [
+          "error",
+          {
+            "ts": "never",
+            "js": "always"
+          }
+      ]
+globals:
+  webpack: false
+  Cesium: false

package.json

@@ -42,6 +42,7 @@
     "cross-env": "7.0.3",
     "eslint": "8.48.0",
     "eslint-config-openlayers": "12.0.0",
+    "eslint-import-resolver-typescript": "^3.6.0",
     "eslint-import-resolver-webpack": "0.13.7",
     "eslint-plugin-import": "^2.28.0",
     "html-loader": "4.2.0",