Simplify build setup with tsc

.babel-register

@@ -1,15 +0,0 @@
-/*
-  See
-    https://github.com/babel/babel/issues/8652
-    https://github.com/babel/babel/pull/6027
-  Babel isn't currently configured by default to read .ts files and
-  can only be configured to do so via cli or configuration below.
-  
-  This file is used by mocha to interpret test files using a properly
-  configured babel.
-
-  This can (probably) be removed in babel 8.x.
-*/
-require('@babel/register')({
-  extensions: ['.ts'],
-})

.babelrc

@@ -1,22 +0,0 @@
-{
-  "presets": [
-    [
-      "@babel/env",
-      {
-        "targets": {
-          "node": "10.4",
-          "browsers": ">1%, not ie 11"
-        },
-        "exclude": [
-          "transform-regenerator"
-        ]
-      }
-    ],
-    "@babel/typescript"
-  ],
-  "plugins": [
-    "@babel/proposal-class-properties",
-    "@babel/proposal-object-rest-spread",
-    "@babel/plugin-syntax-bigint"
-  ]
-}

.github/workflows/test.yml

@@ -14,8 +14,6 @@ jobs:
           registry-url: "https://registry.npmjs.org"
       - name: Install deps
         run: yarn
-      - name: Check types
-        run: yarn check-types
       - name: Lint
         run: yarn lint
       - name: Test build

package.json

@@ -26,15 +26,9 @@
   ],
   "scripts": {
     "clean": "rm -rf lib && rm -rf dist && rm -f tsconfig.tsbuildinfo",
-    "build": "yarn build-lib && yarn build-types",
-    "build:release": "yarn clean && yarn build && yarn build-web",
-    "build-lib": "babel src -x .ts -d lib",
-    "build-types": "tsc --declaration --incremental --outDir lib --project tsconfig.build.json --emitDeclarationOnly",
-    "build-web": "webpack --mode production --entry ./lib/web.js --output ./dist/bls.min.js",
-    "check-types": "tsc --noEmit",
+    "build": "tsc --incremental --project tsconfig.build.json",
     "lint": "eslint --color --ext .ts src/ test/",
     "lint:fix": "yarn run lint --fix",
-    "pretest": "yarn check-types",
     "prepublishOnly": "yarn build",
     "test:web": "karma start",
     "test:unit": "mocha --colors -r ts-node/register 'test/unit/**/*.test.ts'",
@@ -52,14 +46,6 @@
     "randombytes": "^2.1.0"
   },
   "devDependencies": {
-    "@babel/cli": "^7.8.4",
-    "@babel/core": "^7.8.4",
-    "@babel/plugin-proposal-class-properties": "^7.8.3",
-    "@babel/plugin-proposal-object-rest-spread": "^7.8.3",
-    "@babel/plugin-syntax-bigint": "^7.8.3",
-    "@babel/preset-env": "^7.8.4",
-    "@babel/preset-typescript": "^7.8.3",
-    "@babel/register": "^7.8.3",
     "@chainsafe/blst": "^0.1.3",
     "@chainsafe/lodestar-spec-test-util": "^0.12.0",
     "@types/chai": "^4.2.9",

tsconfig.json

@@ -1,7 +1,8 @@
 {
   "include": ["src", "test"],
   "compilerOptions": {
-    "target": "esnext",
+    "outDir": "lib",
+    "target": "es2019",
     "module": "commonjs",
     "pretty": true,
     "lib": ["esnext.bigint", "DOM"],