chore: migrate to eslint@9

Author: nikku

.eslintignore

@@ -0,0 +1,107 @@
+import bpmnIoPlugin from 'eslint-plugin-bpmn-io';
+
+import typescriptPlugin from 'typescript-eslint';
+
+const files = {
+  build: [
+    '*.js',
+    '*.mjs'
+  ],
+  client: [
+    'src/client/**/*.ts',
+    'src/client/**/*.js'
+  ],
+  test: [
+    'src/test/*/*.ts'
+  ],
+  node_test: [
+    'src/test/*.ts'
+  ],
+  ignored: [
+    '.vscode',
+    '.vscode-test',
+    'out'
+  ]
+};
+
+export default [
+  {
+    'ignores': files.ignored
+  },
+  ...bpmnIoPlugin.configs.recommended.map(config => {
+
+    return {
+      ...config,
+      ignores: [
+        ...files.build,
+        ...files.node_test,
+        ...files.client
+      ]
+    };
+  }),
+  ...bpmnIoPlugin.configs.browser.map(config => {
+
+    return {
+      ...config,
+      files: files.client
+    };
+  }),
+  ...bpmnIoPlugin.configs.node.map(config => {
+
+    return {
+      ...config,
+      files: [
+        ...files.build,
+        ...files.node_test
+      ]
+    };
+  }),
+  ...bpmnIoPlugin.configs.mocha.map(config => {
+
+    return {
+      ...config,
+      files: [
+        ...files.test,
+        ...files.node_test
+      ]
+    };
+  }),
+  ...typescriptPlugin.configs.recommended,
+  {
+    rules: {
+      '@typescript-eslint/no-explicit-any': [ 'warn', { 'ignoreRestArgs': true } ],
+      '@typescript-eslint/no-unused-vars': [
+        'error', {
+          'varsIgnorePattern': '^_',
+          'argsIgnorePattern': '^_'
+        }
+      ]
+    },
+    languageOptions: {
+      parserOptions: {
+        tsconfigRootDir: import.meta.dirname
+      }
+    }
+  },
+  {
+    rules: {
+      '@typescript-eslint/no-unused-vars': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+      '@typescript-eslint/no-var-requires': 'off',
+      '@typescript-eslint/ban-ts-comment': 'off',
+      '@typescript-eslint/no-unused-expressions': 'off'
+    },
+    files: [
+      ...files.test,
+      ...files.node_test
+    ]
+  },
+  {
+    rules: {
+      '@typescript-eslint/no-require-imports': 'off'
+    },
+    files: [
+      ...files.node_test
+    ]
+  }
+];