Fix yarn build

* Create a separate `tsconfig.build.json` so that tests are
  not included in the `/build`, but we still get typechecking
  for our test files
* References:
  - https://kjaer.io/ts-npm-config/
  - https://github.com/MaximeKjaer/npm-ts-template

Author: brimtown

package.json

@@ -8,8 +8,10 @@
     "dist/"
   ],
   "scripts": {
-    "build": "tsc -p tsconfig.json",
-    "test": "jest"
+    "build": "tsc -p tsconfig.build.json",
+    "test": "jest",
+    "lint": "eslint src/**/*",
+    "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
     "@types/jest": "^26.0.14",

tsconfig.build.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "noEmit": false
+  },
+  "include": ["src"]
+}

tsconfig.json

@@ -2,6 +2,7 @@
   "compilerOptions": {
     "target": "es5",
     "module": "commonjs",
+    "noEmit": true,
     "declaration": true,
     "strict": true,
     "noImplicitAny": true,
@@ -11,8 +12,7 @@
     "alwaysStrict": true,
     "noFallthroughCasesInSwitch": true,
     "esModuleInterop": true,
-    "forceConsistentCasingInFileNames": true,
-    "outDir": "./dist"
+    "forceConsistentCasingInFileNames": true
   },
   "include": [
     "./src", "./test"