chore: improve tsconfig.json (discordjs#8)

package.json

@@ -11,7 +11,7 @@
 	},
 	"scripts": {
 		"prebuild": "npm run clean",
-		"build": "tsc -b src && gen-esm-wrapper ./dist/index.js ./dist/index.mjs",
+		"build": "tsc && gen-esm-wrapper ./dist/index.js ./dist/index.mjs",
 		"clean": "rimraf dist",
 		"lint": "eslint --ext mjs,ts src/**/*.ts",
 		"lint:fix": "eslint --fix --ext mjs,ts src/**/*.ts",

tsconfig.eslint.json

@@ -1,5 +1,5 @@
 {
-	"extends": "./tsconfig.base.json",
+	"extends": "./tsconfig.json",
 	"compilerOptions": {
 		"allowJs": true
 	},

tsconfig.json

@@ -0,0 +1,51 @@
+{
+	// Mapped from https://www.typescriptlang.org/tsconfig
+	"compilerOptions": {
+		// Type Checking
+		"alwaysStrict": true,
+		"allowUnreachableCode": false,
+		"allowUnusedLabels": false,
+		// TypeScript 4.4
+		// "exactOptionalPropertyTypes": true,
+		"noFallthroughCasesInSwitch": true,
+		"noImplicitOverride": true,
+		"noImplicitReturns": true,
+		"noUnusedLocals": true,
+		"noUnusedParameters": true,
+		"strict": true,
+		// TypeScript 4.4
+		// "useUnknownInCatchVariables": true,
+
+		// Modules
+		"module": "CommonJS",
+		"moduleResolution": "node",
+		"resolveJsonModule": true,
+
+		// Emit
+		"declaration": true,
+		"declarationMap": true,
+		"importHelpers": true,
+		"importsNotUsedAsValues": "error",
+		"inlineSources": true,
+		"newLine": "lf",
+		"noEmitHelpers": true,
+		"outDir": "dist",
+		"preserveConstEnums": true,
+		"removeComments": false,
+		"sourceMap": true,
+		"sourceRoot": "/",
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+
+		// Language and Environment
+		"emitDecoratorMetadata": true,
+		"experimentalDecorators": true,
+		"lib": ["ESNext"],
+		"target": "ES2020",
+		"useDefineForClassFields": true,
+
+		// Completeness
+		"skipLibCheck": true
+	},
+	"include": ["src/**/*.ts"]
+}