build tool tweaks

* following https://github.com/developit/microbundle#specifying-filenames-in-packagejson

package.json

@@ -3,15 +3,17 @@
   "source": "./src/index.ts",
   "version": "1.0.0-next.0",
   "description": "JavaScript client library for Ocean Protocol",
-  "main": "./dist/node/lib.js",
-  "exports": "./dist/node/lib.js",
-  "module": "./dist/node/lib.module.js",
-  "typings": "./dist/node/index.d.ts",
-  "umd:main": "dist/node/lib.umd.js",
-  "unpkg": "./dist/node/lib.cjs2.min.js",
+  "main": "./dist/lib.js",
+  "umd:main": "dist/lib.umd.js",
+  "module": "./dist/lib.module.js",
+  "exports": {
+    "require": "./dist/lib.js",
+    "default": "./dist/lib.modern.js"
+  },
+  "typings": "./dist/src/index.d.ts",
   "scripts": {
     "start": "npm run clean && npm run build:metadata && tsc -w",
-    "build": "npm run clean && npm run build:metadata && microbundle build --format umd,cjs,es --compress --target node --tsconfig tsconfig.json",
+    "build": "npm run clean && npm run build:metadata && microbundle build --format modern,esm,cjs,umd --compress --tsconfig tsconfig.json",
     "build:tsc": "tsc --sourceMap",
     "build:metadata": "node ./scripts/get-metadata.js > src/metadata.json",
     "clean": "rm -rf ./dist/ ./doc/ ./.nyc_output",

tsconfig.json

@@ -4,18 +4,15 @@
     "moduleResolution": "node",
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
-    "lib": ["es2017", "es6", "es7", "dom"],
+    "lib": ["ESNext", "dom"],
     "declaration": true,
-    "module": "commonjs",
-    "target": "es5",
+    "module": "ESNext",
+    "target": "ESNext",
     "removeComments": true,
     "experimentalDecorators": true,
     "preserveConstEnums": true,
-    "outDir": "./dist/node/",
-    "rootDir": ".",
-    "sourceMap": true,
-    "typeRoots": ["node_modules/@types"]
+    "outDir": "./dist/",
+    "sourceMap": true
   },
-  "include": ["src/**/*", "artifacts/**/*"],
-  "exclude": ["node_modules", "**/*.test.ts"]
+  "include": ["src/**/*"]
 }