feat(logger): Add dual exports with esmodule support on Logger

.gitignore

@@ -49,4 +49,5 @@ site
 tmp
 
 # TS build files
-tsconfig.tsbuildinfo
+tsconfig.tsbuildinfo
+tsconfig.esm.tsbuildinfo

packages/logger/README.md

@@ -114,4 +114,4 @@ Credits for the Powertools for AWS Lambda (TypeScript) idea go to [DAZN](https:/
 
 ## License
 
-This library is licensed under the MIT-0 License. See the LICENSE file.
+This library is licensed under the MIT-0 License. See the LICENSE file.

packages/logger/jest.config.js → packages/logger/jest.config.cjs

@@ -4,9 +4,17 @@ module.exports = {
     color: 'cyan',
   },
   runner: 'groups',
-  preset: 'ts-jest',
+  extensionsToTreatAsEsm: ['.ts'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
   transform: {
-    '^.+\\.ts?$': 'ts-jest',
+    '^.+\\.[tj]sx?$': [
+      'ts-jest',
+      {
+        useESM: true,
+      },
+    ],
   },
   moduleFileExtensions: ['js', 'ts'],
   collectCoverageFrom: ['**/src/**/*.ts', '!**/node_modules/**'],

packages/logger/package.json

@@ -16,19 +16,35 @@
     "test:e2e:nodejs18x": "RUNTIME=nodejs18x jest --group=e2e",
     "test:e2e": "jest --group=e2e",
     "watch": "jest --watch --group=unit",
-    "build": "tsc --build --force",
+    "build:cjs": "tsc --build --force",
+    "build:esm": "tsc --project tsconfig.esm.json",
+    "build": "npm run build:esm & npm run build:cjs",
     "lint": "eslint --ext .ts,.js --no-error-on-unmatched-pattern .",
     "lint-fix": "eslint --fix --ext .ts,.js --no-error-on-unmatched-pattern .",
     "prebuild": "rimraf ./lib",
+    "postbuild": "node ./scripts/buildExportPackageJson.js",
     "prepack": "node ../../.github/scripts/release_patch_package_json.js ."
   },
   "lint-staged": {
     "*.{js,ts}": "npm run lint-fix"
   },
   "homepage": "https://github.com/aws-powertools/powertools-lambda-typescript/tree/main/packages/logger#readme",
   "license": "MIT-0",
-  "main": "./lib/index.js",
-  "types": "./lib/index.d.ts",
+  "type": "module",
+  "exports": {
+    "node": {
+      "require": {
+        "types": "./lib/index.d.ts",
+        "default": "./lib/cjs/index.js"
+      },
+      "import": {
+        "types": "./lib/index.d.ts",
+        "default": "./lib/esm/index.js"
+      }
+    }
+  },
+  "types": "./lib/cjs/index.d.ts",
+  "main": "./lib/cjs/index.js",
   "devDependencies": {
     "@aws-lambda-powertools/testing-utils": "file:../testing",
     "@types/lodash.merge": "^4.6.7"
@@ -64,4 +80,4 @@
     "serverless",
     "nodejs"
   ]
-}
+}

packages/logger/scripts/buildExportPackageJson.js

@@ -0,0 +1,19 @@
+import { writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+
+const cjsPackageJson = '{ "type": "commonjs" }';
+writeFileSync(
+  join(__dirname, '..', 'lib', 'cjs', 'package.json'),
+  cjsPackageJson,
+  'utf-8'
+);
+
+const esmPackageJson = '{ "type": "module" }';
+writeFileSync(
+  join(__dirname, '..', 'lib', 'esm', 'package.json'),
+  esmPackageJson,
+  'utf-8'
+);

packages/logger/src/Logger.ts

@@ -2,26 +2,29 @@ import { randomInt } from 'node:crypto';
 import { Console } from 'node:console';
 import type { Context, Handler } from 'aws-lambda';
 import { Utility } from '@aws-lambda-powertools/commons';
-import { LogFormatterInterface, PowertoolsLogFormatter } from './formatter';
-import { LogItem } from './log';
+import { PowertoolsLogFormatter } from './formatter/PowertoolsLogFormatter.js';
+import { LogFormatterInterface } from './formatter/LogFormatterInterface.js';
+import { LogItem } from './log/LogItem.js';
 import merge from 'lodash.merge';
-import { ConfigServiceInterface, EnvironmentVariablesService } from './config';
-import { LogJsonIndent } from './types';
+import { ConfigServiceInterface } from './config/ConfigServiceInterface.js';
+import { EnvironmentVariablesService } from './config/EnvironmentVariablesService.js';
+import { LogJsonIndent } from './types/Logger.js';
 import type {
-  ClassThatLogs,
   Environment,
+  LogAttributes,
+  LogLevel,
+  LogLevelThresholds,
+} from './types/Log.js';
+import type {
+  ClassThatLogs,
   HandlerMethodDecorator,
   LambdaFunctionContext,
-  LogAttributes,
   ConstructorOptions,
   LogItemExtraInput,
   LogItemMessage,
-  LogLevel,
-  LogLevelThresholds,
   PowertoolLogData,
   HandlerOptions,
-} from './types';
-
+} from './types/Logger.js';
 /**
  * ## Intro
  * The Logger utility provides an opinionated logger with output structured as JSON.

packages/logger/src/config/EnvironmentVariablesService.ts

@@ -1,4 +1,4 @@
-import { ConfigServiceInterface } from './ConfigServiceInterface';
+import { ConfigServiceInterface } from './ConfigServiceInterface.js';
 import { EnvironmentVariablesService as CommonEnvironmentVariablesService } from '@aws-lambda-powertools/commons';
 
 /**

packages/logger/src/formatter/LogFormatter.ts

@@ -1,6 +1,7 @@
-import { LogFormatterInterface } from '.';
-import { LogAttributes, UnformattedAttributes } from '../types';
-import { LogItem } from '../log';
+import { LogFormatterInterface } from './LogFormatterInterface.js';
+import { LogAttributes } from '../types/Log.js';
+import { UnformattedAttributes } from '../types/Logger.js';
+import { LogItem } from '../log/LogItem.js';
 
 /**
  * Typeguard to monkey patch Error to add a cause property.