feat(register): try-ts-ext register option

Author: calebboyd

register/try-ts-ext.js

@@ -0,0 +1,3 @@
+require('../dist').register({
+  tryTsExt: true,
+});

src/index.ts

@@ -84,6 +84,7 @@ export interface ProcessEnv {
   TS_NODE_SKIP_PROJECT?: string;
   TS_NODE_SKIP_IGNORE?: string;
   TS_NODE_PREFER_TS_EXTS?: string;
+  TS_NODE_TRY_TS_EXT?: string;
   TS_NODE_IGNORE_DIAGNOSTICS?: string;
   TS_NODE_TRANSPILE_ONLY?: string;
   TS_NODE_TYPE_CHECK?: string;
@@ -280,6 +281,13 @@ export interface RegisterOptions extends CreateOptions {
    * @default false
    */
   preferTsExts?: boolean;
+
+  /**
+   * Attempt to resolve the typescript file when the js file cannot be found.
+   *
+   * @default false
+   */
+  tryTsExt?: boolean
 }
 
 /**
@@ -327,6 +335,7 @@ export const DEFAULTS: RegisterOptions = {
   skipProject: yn(env.TS_NODE_SKIP_PROJECT),
   skipIgnore: yn(env.TS_NODE_SKIP_IGNORE),
   preferTsExts: yn(env.TS_NODE_PREFER_TS_EXTS),
+  tryTsExt: yn(env.TS_NODE_ESM_COMPAT),
   ignoreDiagnostics: split(env.TS_NODE_IGNORE_DIAGNOSTICS),
   transpileOnly: yn(env.TS_NODE_TRANSPILE_ONLY),
   typeCheck: yn(env.TS_NODE_TYPE_CHECK),
@@ -441,7 +450,9 @@ export function register(opts: RegisterOptions = {}): Service {
     originalJsHandler
   );
 
-  patchResolveFileName();
+  if (service.options.tryTsExt) {
+    patchResolveFileName();
+  }
 
   // Require specified modules before start-up.
   (Module as any)._preloadModules(service.options.require);