Slightly optimized createBoundary helper and separated config for .d.ts output.

Author: octet-stream

lib/util/createBoundary.ts

@@ -10,7 +10,14 @@ function createBoundary(size: number): string {
   let res = ""
 
   while (size--) {
-    res += alphabet[Math.floor(Math.random() * alphabet.length)]
+    // I use bitwise `<<` here for slightly more performant string fill.
+    // It will basically do same thing as `Math.truc()`,
+    // except it only support signed 32-bit integers.
+    // Because the result of this operation will always be
+    // a number in range `0` and `alphabet.length - 1` (inclusive),
+    // so we don't need `Math.floor()` too.
+    /* eslint no-bitwise: ["error", {"allow": ["<<"]}] */
+    res += alphabet[(Math.random() * alphabet.length) << 0]
   }
 
   return res

package.json

@@ -27,7 +27,8 @@
     "ci": "c8 npm test && c8 report --reporter=json",
     "build:esm": "ttsc --project tsconfig.esm.json",
     "build:cjs": "ttsc --project tsconfig.cjs.json",
-    "build": "npm run build:esm && npm run build:cjs",
+    "build:types": "ttsc --project tsconfig.d.ts.json",
+    "build": "npm run build:esm && npm run build:cjs && npm run build:types",
     "test": "ava --fail-fast",
     "cleanup": "npx rimraf @type \"lib/**/*.js\"",
     "prepare": "npm run cleanup && npm run build",

tsconfig.d.ts.json

@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.esm.json",
+  "compilerOptions": {
+    "declaration": true,
+    "declarationDir": "./@type",
+    "removeComments": false,
+    "emitDeclarationOnly": true
+  }
+}

tsconfig.esm.json

@@ -2,8 +2,6 @@
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "module": "es2020",
-    "outDir": "lib/esm",
-    "declaration": true,
-    "declarationDir": "./@type",
+    "outDir": "lib/esm"
   }
 }

tsconfig.json

@@ -21,11 +21,12 @@
     "forceConsistentCasingInFileNames": true,
     "allowSyntheticDefaultImports": true,
     "experimentalDecorators": true,
+    "removeComments": true,
     "plugins": [
       {
         "transform": "@zoltu/typescript-transformer-append-js-extension/output/index.js",
         "after": true
       }
     ]
   }
-}
+}