feat: add esnext target to support using library via ES modules

closes ydb-platform#145

fixup.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+cat >build/cjs/package.json <<!EOF
+{
+    "type": "commonjs"
+}
+!EOF
+
+cat >build/esm/package.json <<!EOF
+{
+    "type": "module"
+}
+!EOF

jest.config.js

@@ -1,8 +1,13 @@
 module.exports = {
-  roots: ['<rootDir>/src'],
-  transform: {
-    '^.+\\.tsx?$': 'ts-jest',
-  },
-  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
-  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+    globals: {
+        'ts-jest': {
+            tsconfig: 'tsconfig-cjs.json'
+        }
+    },
+    roots: ['<rootDir>/src'],
+    transform: {
+        '^.+\\.tsx?$': 'ts-jest',
+    },
+    testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
+    moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
 }

package.json

@@ -2,7 +2,14 @@
   "name": "ydb-sdk",
   "version": "3.2.0",
   "description": "Node.js bindings for working with YDB API over gRPC",
-  "main": "build/index.js",
+  "main": "build/cjs/index.js",
+  "module": "build/esm/index.js",
+  "exports": {
+    ".": {
+      "import": "./build/esm/index.js",
+      "require": "./build/cjs/index.js"
+    }
+  },
   "files": [
     "build/**",
     "certs/"
@@ -12,7 +19,7 @@
     "test:integration": "jest",
     "test:all": "run-p test:unit test:integration",
     "test": "npm run test:unit",
-    "build": "tsc",
+    "build": "tsc -p tsconfig-esm.json && tsc -p tsconfig-cjs.json && ./fixup.sh",
     "clean": "rm -rf build",
     "prepublish": "npm run clean && npm run build",
     "release": "standard-version"

tsconfig.json → tsconfig-base.json

@@ -1,8 +1,5 @@
 {
   "compilerOptions": {
-    "target": "es2017",
-    "module": "commonjs",
-    "outDir": "build",
     "moduleResolution": "node",
     "esModuleInterop": true,
     "pretty": true,

tsconfig-cjs.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig-base.json",
+  "compilerOptions": {
+    "target": "es2017",
+    "module": "commonjs",
+    "outDir": "build/cjs"
+  }
+}

tsconfig-esm.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig-base.json",
+  "compilerOptions": {
+    "module": "esnext",
+    "outDir": "build/esm",
+    "target": "esnext"
+  }
+}