chore: Eslint v9

eslint.config.mjs

@@ -0,0 +1,142 @@
+import tsParser from '@typescript-eslint/parser'
+import streamr from 'eslint-config-streamr-ts'
+import importPlugin from 'eslint-plugin-import'
+import globals from 'globals'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename);
+
+export default [
+    {
+        ignores: [
+            '**/generated/**',
+            '**/dist/**',
+            '**/node_modules/**'
+        ]
+    },
+    ...streamr,
+    importPlugin.flatConfigs.recommended,
+    importPlugin.flatConfigs.typescript,
+    {
+        name: 'streamr-network-typescript',
+        languageOptions: {
+            globals: globals.node,
+            parser: tsParser,
+            parserOptions: {
+                project: ['./tsconfig.jest.json'],
+                tsconfigRootDir: __dirname
+            }
+        },
+        settings: {
+            'import/resolver': {
+                typescript: {
+                    alwaysTryTypes: true,
+                    project: [
+                        'packages/*/tsconfig.jest.json',
+                        'packages/browser-test-runner/tsconfig.node.json'
+                    ]
+                },
+                node: true
+            }
+        },
+        rules: {
+            'class-methods-use-this': 'error',
+            'default-case': 'error',
+            'eol-last': 'error',
+            'no-console': ['error', {
+                allow: ['warn', 'error', 'info']
+            }],
+            'no-lonely-if': 'error',
+            'no-multi-spaces': ['error', {
+                ignoreEOLComments: true
+            }],
+            'no-restricted-imports': ['error', {
+                patterns: ['*/dist']
+            }],
+            'no-unneeded-ternary': 'error',
+            'no-useless-return': 'error',
+            'prefer-arrow-callback': 'error',
+            'quotes': ['error', 'single', {
+                allowTemplateLiterals: true
+            }],
+            '@typescript-eslint/default-param-last': 'error',
+            '@typescript-eslint/no-extraneous-class': 'error',
+            '@typescript-eslint/no-inferrable-types': 'off',
+            '@typescript-eslint/no-invalid-this': 'error',
+            '@typescript-eslint/no-invalid-void-type': 'error',
+            '@typescript-eslint/no-misused-promises': ['error', {
+                checksVoidReturn: false
+            }],
+            '@typescript-eslint/no-unused-expressions': 'error',
+            '@typescript-eslint/no-unused-vars': ['error', {
+                vars: 'all',
+                args: 'all',
+                argsIgnorePattern: '^_',
+                varsIgnorePattern: '^_',
+                caughtErrorsIgnorePattern: '^_'
+            }],
+            '@typescript-eslint/no-useless-constructor': 'error',
+            '@typescript-eslint/no-useless-empty-export': 'error',
+            '@typescript-eslint/parameter-properties': 'error',
+            '@typescript-eslint/prefer-literal-enum-member': 'error',
+            '@typescript-eslint/restrict-template-expressions': ['error', {
+                allowAny: false,
+                allowBoolean: true,
+                allowNullish: true,
+                allowNumber: true,
+                allowRegExp: true,
+                allowNever: true,
+                allow: [{ from: 'lib', name: 'Error' }]
+            }],
+            '@stylistic/brace-style': ['error', '1tbs', {
+                allowSingleLine: true
+            }],
+            '@stylistic/comma-spacing': 'error',
+            '@stylistic/func-call-spacing': 'error',
+            '@stylistic/keyword-spacing': 'error',
+            '@stylistic/member-delimiter-style': ['error', {
+                singleline: { delimiter: 'comma' },
+                multiline: { delimiter: 'none' }
+            }],
+            '@stylistic/object-curly-spacing': ['error', 'always'],
+            '@stylistic/space-before-blocks': 'error',
+            '@stylistic/space-before-function-paren': ['error', {
+                anonymous: 'never',
+                named: 'never',
+                asyncArrow: 'always'
+            }],
+            '@stylistic/space-infix-ops': 'error',
+            'import/no-extraneous-dependencies': ['error', {
+                devDependencies: [ 'test/**/*.ts', 'test/**/*.js'],
+                packageDir: ['.', '../..']
+            }],
+            'promise/always-return': ['error', {
+                ignoreLastCallback: true
+            }],
+            'promise/no-promise-in-callback': 'error',
+
+            // TODO in follow up PRs, select which rules we should enable and fix the code. When all recommended rules
+            // have been enabled, consider enabling the 'strict' preset.
+            '@typescript-eslint/require-await': 'off',
+            '@typescript-eslint/no-floating-promises': 'off',
+            '@typescript-eslint/no-unsafe-return': 'off',
+            '@typescript-eslint/no-unsafe-argument': 'off',
+            '@typescript-eslint/no-unsafe-assignment': 'off',
+            '@typescript-eslint/no-unsafe-member-access': 'off',
+            '@typescript-eslint/no-unsafe-call': 'off',
+            '@typescript-eslint/restrict-plus-operands': 'off',
+            '@typescript-eslint/unbound-method': 'off',
+            '@typescript-eslint/no-base-to-string': 'off',
+            '@typescript-eslint/no-unsafe-enum-comparison': 'off',
+            '@typescript-eslint/no-redundant-type-constituents': 'off'
+        }
+    },
+    {
+        files: ['**/*.js'],
+        languageOptions: {
+            sourceType: 'commonjs'
+        }
+    }
+]