Create dual ES5 and ES2017 builds

.gitignore

@@ -1,5 +1,6 @@
 package-lock.json
 node_modules
-dist/
+dist
+dist.browser
 .nyc_output
 coverage

.prettierignore

@@ -2,6 +2,7 @@ node_modules
 .vscode
 package.json
 dist
+dist.browser
 .nyc_output
 *.json
 docs

package.json

@@ -5,14 +5,16 @@
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "files": [
-    "dist/**/*"
+    "dist",
+    "dist.browser"
   ],
+  "browser": "dist.browser/index.js",
   "scripts": {
     "benchmarks": "npm run build && ts-node benchmarks/index.ts",
-    "build": "ethereumjs-config-build",
+    "build": "tsc -p tsconfig.json && tsc -p tsconfig.browser.json",
     "prepublishOnly": "npm run test && npm run build",
     "coverage": "nyc --reporter=lcov npm run test:node",
-    "docs:build": "npx typedoc",
+    "docs:build": "typedoc",
     "lint": "ethereumjs-config-lint",
     "lint:fix": "ethereumjs-config-lint-fix",
     "format": "ethereumjs-config-format",

tsconfig.browser.json

@@ -0,0 +1,9 @@
+{
+    "extends": "./tsconfig.json",
+    "compilerOptions": {
+      "outDir": "./dist.browser",
+    },
+    "target": "es5",
+    "lib": ["dom", "es5"]
+}
+

tsconfig.json

@@ -1,4 +1,8 @@
 {
   "extends": "@ethereumjs/config-tsc",
+  "compilerOptions": {
+    "outDir": "./dist"
+  },
   "include": ["src/**/*.ts"],
+  "target": "ES2017"
 }