add "module" entrypoint, replace esnext with es2020

.gitignore

@@ -1,6 +1,6 @@
 .DS_Store
 dist
-dist.esnext
+dist.esm
 node_modules
 perf/filesize/bundle.js
 yarn-error.log

package.json

@@ -3,7 +3,8 @@
   "version": "5.1.1",
   "description": "Dead simple state management for React",
   "main": "dist/src/index.js",
-  "main:esnext": "dist.esnext/index.js",
+  "module": "dist.esm/index.js",
+  "main:esnext": "dist.esm/index.js",
   "typings": "dist/src/index.d.ts",
   "author": "Boris Cherny <[email protected]>",
   "license": "MIT",
@@ -16,9 +17,9 @@
   },
   "homepage": "https://github.com/bcherny/undux#readme",
   "scripts": {
-    "build": "npm run clean && npm run lint && tsc -d && npm run build:esnext && flow focus-check src/index.js.flow && cp src/index.js.flow dist/src/index.js.flow",
-    "build:esnext": "tsc -d -p ./tsconfig.esnext.json",
-    "clean": "shx rm -rf dist dist.esnext",
+    "build": "npm run clean && npm run lint && tsc -d && npm run build:esm && flow focus-check src/index.js.flow && cp src/index.js.flow dist/src/index.js.flow",
+    "build:esm": "tsc -d -p ./tsconfig.esm.json",
+    "clean": "shx rm -rf dist dist.esm",
     "format": "prettier --write src/* src/**/* test/**/*",
     "lint": "eslint ./src/**/*",
     "profile:filesize": "webpack --config ./perf/filesize/webpack.config.js -p && cat ./perf/filesize/bundle.js | gzip | wc -c",

tsconfig.esnext.json → tsconfig.esm.json

@@ -10,12 +10,12 @@
     "module": "esnext",
     "moduleResolution": "node",
     "newLine": "LF",
-    "outDir": "dist.esnext",
+    "outDir": "dist.esm",
     "preserveConstEnums": true,
     "skipLibCheck": true,
     "sourceMap": true,
     "strict": true,
-    "target": "esnext",
+    "target": "es2020",
     "paths": {
       "typed-rx-emitter": ["node_modules/typed-rx-emitter/dist.esnext"]
     }