refactor: Add explicit types file

Missing dev dependencies can cause issues on importing from package types, so we are adding an explicit declaration file for exported types

package.json

@@ -3,7 +3,7 @@
   "version": "3.3.0",
   "description": "Transforms module resolution paths using TypeScript path mapping and/or custom paths",
   "main": "dist/index.js",
-  "types": "dist/index.d.ts",
+  "types": "types/index.d.ts",
   "scripts": {
     "compile": "tsc",
     "build": "yarn run clean && yarn run compile",
@@ -45,6 +45,7 @@
   ],
   "files": [
     "dist",
+    "types",
     "README.md",
     "CHANGELOG.md",
     "register.js"

tsconfig.base.json

@@ -2,6 +2,7 @@
   "compilerOptions": {
     "noErrorTruncation": false,
     "incremental": true,
+    "declaration": false,
 
     "lib": [ "esnext" ],
     "target": "es2015",

types/index.d.ts

@@ -0,0 +1,36 @@
+import TSNode from 'ts-node'
+import ts from 'typescript'
+
+/* ****************************************************************************************************************** *
+ * Hardcoded declarations file for npm package
+ * ****************************************************************************************************************** */
+
+export interface TsTransformPathsConfig {
+  readonly useRootDirs?: boolean;
+  readonly exclude?: string[];
+  readonly afterDeclarations?: boolean;
+  readonly tsConfig?: string;
+  readonly transform?: string
+}
+
+export interface TransformerExtras {
+  /**
+   * Originating TypeScript instance
+   */
+  ts: typeof ts;
+}
+
+export function register(): TSNode.RegisterOptions | undefined
+
+export default function transformer(
+  program?: ts.Program,
+  pluginConfig?: TsTransformPathsConfig,
+  transformerExtras?: TransformerExtras,
+  /**
+   * Supply if manually transforming with compiler API via 'transformNodes' / 'transformModule'
+   */
+  manualTransformOptions?: {
+    compilerOptions?: ts.CompilerOptions;
+    fileNames?: string[];
+  }
+): ts.CustomTransformer