Migrate package to ESM format

.circleci/config.yml

@@ -6,7 +6,7 @@ orbs:
 parameters:
   node_version:
     type: string
-    default: '16.15.0'
+    default: '16.17.0'
 
 commands:
   install_deps:
@@ -15,7 +15,9 @@ commands:
           pkg-manager: yarn
           cache-version: v1-all
           app-dir: ~/repo
-          override-ci-command: yarn install --pure-lockfile --ignore-scripts --no-progress
+          override-ci-command: >
+            npx --yes retry-cli -n 5 -t 3000 --
+            yarn install --pure-lockfile --ignore-scripts --no-progress
 
 jobs:
   build:
@@ -26,6 +28,6 @@ jobs:
     steps:
       - checkout
       - install_deps
-      - run: yarn test --maxWorkers=4
       - run: yarn type-check
       - run: yarn lint:ci
+      - run: yarn coverage --maxWorkers=4

jest.config.ts

@@ -0,0 +1,18 @@
+import type {Config} from 'jest';
+
+const config: Config = {
+  transform: {
+    '^.+\\.(t|j)sx?$': '@swc/jest',
+  },
+  resetMocks: true,
+  coverageThreshold: {
+    global: {
+      branches: 100,
+      functions: 100,
+      lines: 100,
+      statements: 100,
+    },
+  },
+};
+
+export default config;

package.json

@@ -8,17 +8,18 @@
     "email": "vlad@shelf.io",
     "url": "https://shelf.io"
   },
-  "main": "lib",
+  "sideEffects": false,
+  "type": "module",
+  "exports": "./lib/index.js",
+  "main": "lib/index.js",
   "types": "lib/index.d.ts",
   "files": [
     "lib"
   ],
   "scripts": {
     "benchmark:memory": "yarn build && cd benchmark/memory && ./test.sh",
     "benchmark:speed": "yarn build && cd benchmark/speed && babel test.ts | node",
-    "build": "rm -rf lib/ && yarn build:types && yarn build:code",
-    "build:code": "babel src --out-dir lib --ignore '**/*.test.ts' --extensions '.ts' && find ./lib -name '*.test.d.ts' -delete",
-    "build:types": "tsc --emitDeclarationOnly --declaration --isolatedModules false --declarationDir lib",
+    "build": "rm -rf lib/ && tsc",
     "coverage": "yarn test --coverage",
     "lint": "yarn lint:ci --fix",
     "lint:ci": "eslint . --ext .js,.ts,.json",
@@ -35,17 +36,13 @@
       "eslint --fix"
     ]
   },
-  "babel": {
-    "extends": "@shelf/babel-config/backend"
-  },
   "prettier": "@shelf/prettier-config",
   "devDependencies": {
-    "@babel/cli": "7.22.5",
-    "@babel/core": "7.22.5",
-    "@shelf/babel-config": "1.2.0",
     "@shelf/eslint-config": "2.27.1",
     "@shelf/prettier-config": "1.0.0",
     "@shelf/tsconfig": "0.0.11",
+    "@swc/core": "1.3.73",
+    "@swc/jest": "0.2.27",
     "@types/jest": "29.4.0",
     "@types/node": "14",
     "benny": "3.7.1",
@@ -56,6 +53,7 @@
     "lint-staged": "13.2.2",
     "normalize-space-x": "4.1.2",
     "prettier": "2.8.8",
+    "ts-node": "10.9.1",
     "typescript": "5.1.3"
   },
   "engines": {

src/index.test.ts

@@ -15,6 +15,12 @@ describe('#normalizeSpaces', () => {
     expect(result).toEqual('a b');
   });
 
+  it('should normalize text without spaces at the start and at the end correctly', () => {
+    const result = normalizeSpaces(`a${ALL_WHITESPACE_CHARS_2018}b`);
+
+    expect(result).toEqual('a b');
+  });
+
   it('should normalize text with character that consists of surrogate pairs correctly', () => {
     const result = normalizeSpaces('   hello     \n\n\n  interesting   \n \n \tworld  😀 ');
 

tsconfig.json

@@ -1,8 +1,14 @@
 {
   "extends": "@shelf/tsconfig/backend",
   "compilerOptions": {
-    "strict": true
+    "strict": true,
+    "module": "ESNext",
+    "target": "ESNext",
+    "moduleResolution": "node",
+    "declaration": true,
+    "resolveJsonModule": false,
+    "outDir": "lib"
   },
-  "exclude": ["node_modules"],
+  "exclude": ["node_modules", "**/*.test.*", "**/*.mock.ts"],
   "include": ["src"]
 }