feat(esm): is a pure ESM package now

BREAKING CHANGE: CommonJS no longer exported/supported

README.md

@@ -11,12 +11,13 @@
 
 The functions are standalone and depends on no particular Promise implementation and therefore works well for JavaScript's built-in Promise.
 
-The library is written in TypeScript, so typings are provided. Apart from being exported as JavaScript (ES2019), it's also exported as an *ES module*, if imported in platforms (and bundlers) supporting this.
+The library is written in TypeScript, so typings are provided. It is exported only as an [ESM package](esm-package)!
 
 
 # Versions
 
  * Since version 2, `Finally` and `Try` are removed. They should be replaced with `Promise.prototype.finally` and async functions.
+ * Since version 3, it's only exported as an [ESM package](esm-package).
 
 
 # Types
@@ -170,13 +171,11 @@ somePromise
 .then( delayChain( 100 ) )
 ```
 
-To always delay a chain, regardless of whether it was resolved or rejected, use `finallyDelay`. **Note the triple dots**, and read more about `Finally` below...
+To always delay a chain, regardless of whether it was resolved or rejected, use:
 
 ```ts
-import { finallyDelay } from 'already'
-
 somePromise
-.then( ...finallyDelay( 100 ) )
+.finally( delayChain( 100 ) )
 ```
 
 
@@ -888,3 +887,4 @@ async function getConnection( )
 [greenkeeper-url]: https://greenkeeper.io/
 [lgtm-image]: https://img.shields.io/lgtm/grade/javascript/g/grantila/already.svg?logo=lgtm&logoWidth=18
 [lgtm-url]: https://lgtm.com/projects/g/grantila/already/context:javascript
+[esm-package]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

jest.config.js

@@ -1,7 +1,24 @@
-const hasModules =
-  parseInt( process.versions.node.split( "." )[ 0 ], 10 ) > 12;
-
-module.exports =
-  hasModules
-  ? require( './jest.config.modules' )
-  : require( './jest.config.common' );
+export default {
+	// preset: "ts-jest",
+	"transform": {
+		"^.+\\.jsx?$": "babel-jest",
+		"^.+\\.tsx?$": "ts-jest"
+	},
+	testEnvironment: "node",
+	testMatch: [
+		"<rootDir>/test-out/**/*.js",
+		"<rootDir>/test/**/*.ts",
+	],
+	moduleFileExtensions: ["js", "ts", "mjs"],
+	modulePathIgnorePatterns: [
+		".*\.d\.ts"
+	],
+	collectCoverageFrom: [
+		"<rootDir>/dist/**/*.js",
+	],
+	coverageReporters: ["lcov", "text", "html"],
+	setupFiles: [
+		"trace-unhandled/register",
+	],
+	maxConcurrency: Infinity,
+}

lib/index.ts

@@ -631,7 +631,7 @@ function onceDynamic( ): OnceRunner
 export function retry< R >(
 	times: number,
 	fn: ( ) => R,
-	retryable: ( err: Error ) => boolean = ( ) => true
+	retryable: ( err: unknown ) => boolean = ( ) => true
 )
 : R
 {
@@ -647,7 +647,7 @@ export function retry< R >(
 			return retryAsync( < any >fn( ) );
 		} );
 
-	const retrySync = ( _err: Error ): R =>
+	const retrySync = ( _err: unknown ): R =>
 	{
 		while ( --times >= 0 )
 		{

package.json

@@ -1,30 +1,26 @@
 {
   "name": "already",
-  "description": "Promise extensions; finally, map, filter, etc",
+  "description": "Promise extensions; map, filter, etc",
   "license": "MIT",
   "version": "0.0.0-development",
   "author": "Gustaf Räntilä <[email protected]>",
   "repository": {
     "type": "git",
     "url": "https://github.com/grantila/already"
   },
+  "engines": {
+    "node": ">=12.20"
+  },
+  "type": "module",
   "files": [
-    "dist",
-    "dist-mjs"
+    "dist"
   ],
   "main": "./dist/index.js",
+  "exports": "./dist/index.js",
   "types": "./dist/index.d.ts",
-  "exports": {
-    "import": "./dist-mjs/index.js",
-    "require": "./dist/index.js"
-  },
   "scripts": {
-    "build:dist": "scripts/build.sh dist ./tsconfig.prod.json --module CommonJS -t ES2019",
-    "build:dist-mjs": "scripts/build.sh dist-mjs ./tsconfig.prod.json --module ESNext -t ES2019",
-    "build:test-out": "scripts/build.sh test-out ./tsconfig.test.json",
-    "build:test-out-mjs": "scripts/build.sh test-out-mjs ./tsconfig.test.json --module CommonJS -t esnext && scripts/rewrite-mjs-test.js",
-    "build:lib": "concurrently 'yarn build:dist' 'yarn build:dist-mjs'",
-    "build:test": "concurrently 'yarn build:test-out' 'yarn build:test-out-mjs'",
+    "build:lib": "scripts/build.sh dist ./tsconfig.prod.json",
+    "build:test": "scripts/build.sh test-out ./tsconfig.test.json",
     "build": "yarn build:lib && yarn build:test",
     "lint": "true",
     "jest": "node_modules/.bin/jest --coverage",
@@ -52,19 +48,19 @@
   ],
   "devDependencies": {
     "@babel/plugin-syntax-optional-chaining": "^7.8.3",
-    "@babel/plugin-transform-modules-commonjs": "^7.12.1",
-    "@babel/preset-typescript": "^7.12.7",
+    "@babel/plugin-transform-modules-commonjs": "^7.15.4",
+    "@babel/preset-typescript": "^7.15.0",
     "@types/jest": "^26.0.15",
     "commitizen": "^4.2.2",
-    "concurrently": "^6.2.0",
+    "concurrently": "^6.2.1",
     "cz-conventional-changelog": "^3.3.0",
     "jest": "^26.6.3",
     "pre-commit": "1.x",
     "rimraf": "^3.0.2",
     "trace-unhandled": "^2.0.1",
     "ts-jest": "^26.4.4",
     "tslint": "6.1.3",
-    "typescript": "4.3.4"
+    "typescript": "4.4.3"
   },
   "dependencies": {},
   "config": {

test/index.ts

@@ -2323,9 +2323,9 @@ describe( "wrapFunction", ( ) =>
 					( ( ) => Promise.resolve( 42 ) );
 				expect( false ).toBe( true );
 			}
-			catch ( err )
+			catch ( err: any )
 			{
-				expect( err.message ).toBe(
+				expect( err?.message ).toBe(
 					"Invalid invocation, function requires 2 arguments"
 				);
 			}
@@ -2358,9 +2358,9 @@ describe( "wrapFunction", ( ) =>
 					( "foo", ( ) => Promise.resolve( 42 ) );
 				expect( false ).toBe( true );
 			}
-			catch ( err )
+			catch ( err: any )
 			{
-				expect( err.message ).toBe(
+				expect( err?.message ).toBe(
 					"Invalid return value in 'before' handler"
 				);
 			}
@@ -2383,9 +2383,9 @@ describe( "wrapFunction", ( ) =>
 					( "foo", ( ) => Promise.resolve( 42 ) );
 				expect( false ).toBe( true );
 			}
-			catch ( err )
+			catch ( err: any )
 			{
-				expect( err.message ).toBe( "foobar" );
+				expect( err?.message ).toBe( "foobar" );
 			}
 		} )( );
 

tsconfig.json

@@ -8,7 +8,7 @@
 			"node"
 		],
 		"target": "ES2019",
-		"module": "CommonJS",
+		"module": "ES2020",
 		"moduleResolution": "node",
 		"noImplicitAny": true,
 		"noUnusedLocals": true,