Implement OpenTracing-like tracer

README.md

@@ -4,7 +4,7 @@ This library provides a JavaScript/TypeScript logger inspired by Python's logger
 
 * Simple logging with default handlers supporting `console.log`, `console.error`, and `process.stderr`.
 * Fast, logging level checks or log filters are applied **before** log records are created
-* Complex log records properties ssupport lazy evaluation, so they evaluated only when they need to be rendered
+* Complex log records properties support lazy evaluation, so they evaluated only when they need to be rendered
 * Flexible composition of loggers, handlers and formatters
 * Custom formatting using template literals
 * Supports structured logging through a JSON formatter

jest.config.mjs

@@ -1,27 +1,16 @@
 import path from 'node:path';
 import url from 'node:url';
-import tsconfigJSON from './tsconfig.json' assert { type: "json" };
+import tsconfigJSON from './tsconfig.json' assert { type: 'json' };
 
 const projectPath = path.dirname(url.fileURLToPath(import.meta.url));
 
-// Global variables that are shared across the jest worker pool
-// These variables must be static and serializable
 const globals = {
-  // Absolute directory to the project root
   projectDir: projectPath,
-  // Absolute directory to the test root
   testDir: path.join(projectPath, 'tests'),
-  // Default asynchronous test timeout
   defaultTimeout: 20000,
-  // Timeouts rely on setTimeout which takes 32 bit numbers
   maxTimeout: Math.pow(2, 31) - 1,
 };
 
-// The `globalSetup` and `globalTeardown` cannot access the `globals`
-// They run in their own process context
-// They can however receive the process environment
-// Use `process.env` to set variables
-
 const config = {
   testEnvironment: 'node',
   verbose: true,
@@ -30,55 +19,61 @@ const config = {
   coverageDirectory: '<rootDir>/tmp/coverage',
   roots: ['<rootDir>/tests'],
   testMatch: ['**/?(*.)+(spec|test|unit.test).+(ts|tsx|js|jsx)'],
+
+  // Use SWC to transpile TS/JS/TSX
   transform: {
-    "^.+\\.(t|j)sx?$": [
-      "@swc/jest",
+    '^.+\\.(t|j)sx?$': [
+      '@swc/jest',
       {
         jsc: {
           parser: {
-            syntax: "typescript",
+            syntax: 'typescript',
             tsx: true,
             decorators: tsconfigJSON.compilerOptions.experimentalDecorators,
             dynamicImport: true,
           },
           target: tsconfigJSON.compilerOptions.target.toLowerCase(),
           keepClassNames: true,
         },
-      }
+        module: {
+          type: 'es6', // Crucial for ESM-style imports
+        },
+      },
     ],
   },
+
+  // Required to treat TS/TSX as ESM in Jest
+  extensionsToTreatAsEsm: ['.ts', '.tsx', '.mts'],
+
+  moduleNameMapper: {
+    // Remove `.js` extension from relative imports in source like `./foo.js` → `./foo`
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
+
   reporters: [
     'default',
-    ['jest-junit', {
-      outputDirectory: '<rootDir>/tmp/junit',
-      classNameTemplate: '{classname}',
-      ancestorSeparator: ' > ',
-      titleTemplate: '{title}',
-      addFileAttribute: 'true',
-      reportTestSuiteErrors: 'true',
-    }],
+    [
+      'jest-junit',
+      {
+        outputDirectory: '<rootDir>/tmp/junit',
+        classNameTemplate: '{classname}',
+        ancestorSeparator: ' > ',
+        titleTemplate: '{title}',
+        addFileAttribute: 'true',
+        reportTestSuiteErrors: 'true',
+      },
+    ],
   ],
+
   collectCoverageFrom: ['src/**/*.{ts,tsx,js,jsx}', '!src/**/*.d.ts'],
   coverageReporters: ['text', 'cobertura'],
+
   globals,
-  // Global setup script executed once before all test files
+
   globalSetup: '<rootDir>/tests/globalSetup.ts',
-  // Global teardown script executed once after all test files
   globalTeardown: '<rootDir>/tests/globalTeardown.ts',
-  // Setup files are executed before each test file
-  // Can access globals
   setupFiles: ['<rootDir>/tests/setup.ts'],
-  // Setup files after env are executed before each test file
-  // after the jest test environment is installed
-  // Can access globals
-  setupFilesAfterEnv: [
-    'jest-extended/all',
-    '<rootDir>/tests/setupAfterEnv.ts'
-  ],
-  moduleNameMapper: {
-    "^(\\.{1,2}/.*)\\.js$": "$1",
-  },
-  extensionsToTreatAsEsm: ['.ts', '.tsx', '.mts'],
+  setupFilesAfterEnv: ['jest-extended/all', '<rootDir>/tests/setupAfterEnv.ts'],
 };
 
 export default config;