Nodenext polish (#1757)

* Add experimentalSpecifierResolution to CLI flags, tsconfig, public API

* Make moduleTypes page link to https://www.typescriptlang.org/docs/handbook/esm-node.html

* Allow .jsx imports to remap to .tsx, the same way .js can map to .tsx

* improve experimentalResolver docs

* again tweak moduleTypeOverrides doc

* lint-fix

* tweak `experimentalResolver` docs

dist-raw/node-internal-modules-cjs-loader.js

@@ -144,7 +144,7 @@ function readPackageScope(checkPath) {
  */
 function createCjsLoader(opts) {
 const {nodeEsmResolver, preferTsExts} = opts;
-const {replacementsForCjs, replacementsForJs, replacementsForMjs} = opts.extensions;
+const {replacementsForCjs, replacementsForJs, replacementsForMjs, replacementsForJsx} = opts.extensions;
 const {
   encodedSepRegEx,
   packageExportsResolve,
@@ -219,10 +219,11 @@ function statReplacementExtensions(p) {
   const lastDotIndex = p.lastIndexOf('.');
   if(lastDotIndex >= 0) {
     const ext = p.slice(lastDotIndex);
-    if (ext === '.js' || ext === '.cjs' || ext === '.mjs') {
+    if (ext === '.js' || ext === '.jsx' || ext === '.mjs' || ext === '.cjs') {
       const pathnameWithoutExtension = p.slice(0, lastDotIndex);
       const replacementExts =
         ext === '.js' ? replacementsForJs
+        : ext === '.jsx' ? replacementsForJsx
         : ext === '.mjs' ? replacementsForMjs
         : replacementsForCjs;
       for (let i = 0; i < replacementExts.length; i++) {
@@ -240,10 +241,11 @@ function tryReplacementExtensions(p, isMain) {
   const lastDotIndex = p.lastIndexOf('.');
   if(lastDotIndex >= 0) {
     const ext = p.slice(lastDotIndex);
-    if (ext === '.js' || ext === '.cjs' || ext === '.mjs') {
+    if (ext === '.js' || ext === '.jsx' || ext === '.mjs' || ext === '.cjs') {
       const pathnameWithoutExtension = p.slice(0, lastDotIndex);
       const replacementExts =
         ext === '.js' ? replacementsForJs
+        : ext === '.jsx' ? replacementsForJsx
         : ext === '.mjs' ? replacementsForMjs
         : replacementsForCjs;
       for (let i = 0; i < replacementExts.length; i++) {

dist-raw/node-internal-modules-esm-resolve.js

@@ -92,7 +92,7 @@ function createResolve(opts) {
 // TODO receive cached fs implementations here
 const {preferTsExts, tsNodeExperimentalSpecifierResolution, extensions} = opts;
 const esrnExtensions = extensions.experimentalSpecifierResolutionAddsIfOmitted;
-const {legacyMainResolveAddsIfOmitted, replacementsForCjs, replacementsForJs, replacementsForMjs} = extensions;
+const {legacyMainResolveAddsIfOmitted, replacementsForCjs, replacementsForJs, replacementsForMjs, replacementsForJsx} = extensions;
 // const experimentalSpecifierResolution = tsNodeExperimentalSpecifierResolution ?? getOptionValue('--experimental-specifier-resolution');
 const experimentalSpecifierResolution = tsNodeExperimentalSpecifierResolution != null ? tsNodeExperimentalSpecifierResolution : getOptionValue('--experimental-specifier-resolution');
 
@@ -310,10 +310,11 @@ function resolveReplacementExtensions(search) {
   const lastDotIndex = search.pathname.lastIndexOf('.');
   if(lastDotIndex >= 0) {
     const ext = search.pathname.slice(lastDotIndex);
-    if (ext === '.js' || ext === '.cjs' || ext === '.mjs') {
+    if (ext === '.js' || ext === '.jsx' || ext === '.mjs' || ext === '.cjs') {
       const pathnameWithoutExtension = search.pathname.slice(0, lastDotIndex);
       const replacementExts =
         ext === '.js' ? replacementsForJs
+        : ext === '.jsx' ? replacementsForJsx
         : ext === '.mjs' ? replacementsForMjs
         : replacementsForCjs;
       const guess = new URL(search.toString());

src/bin.ts

@@ -24,6 +24,7 @@ import {
   createEsmHooks,
   createFromPreloadedConfig,
   DEFAULTS,
+  ExperimentalSpecifierResolution,
 } from './index';
 import type { TSInternal } from './ts-compiler-types';
 import { addBuiltinLibsToObject } from '../dist-raw/node-internal-modules-cjs-helpers';
@@ -140,6 +141,7 @@ function parseArgv(argv: string[], entrypointArgs: Record<string, any>) {
         '--scope': Boolean,
         '--scopeDir': String,
         '--noExperimentalReplAwait': Boolean,
+        '--experimentalSpecifierResolution': String,
 
         // Aliases.
         '-e': '--eval',
@@ -173,6 +175,8 @@ function parseArgv(argv: string[], entrypointArgs: Record<string, any>) {
         '--log-error': '--logError',
         '--scope-dir': '--scopeDir',
         '--no-experimental-repl-await': '--noExperimentalReplAwait',
+        '--experimental-specifier-resolution':
+          '--experimentalSpecifierResolution',
       },
       {
         argv,
@@ -215,6 +219,7 @@ function parseArgv(argv: string[], entrypointArgs: Record<string, any>) {
     '--scope': scope = undefined,
     '--scopeDir': scopeDir = undefined,
     '--noExperimentalReplAwait': noExperimentalReplAwait,
+    '--experimentalSpecifierResolution': experimentalSpecifierResolution,
     '--esm': esm,
     _: restArgs,
   } = args;
@@ -253,6 +258,7 @@ function parseArgv(argv: string[], entrypointArgs: Record<string, any>) {
     scope,
     scopeDir,
     noExperimentalReplAwait,
+    experimentalSpecifierResolution,
     esm,
   };
 }
@@ -300,6 +306,8 @@ Options:
   --preferTsExts                  Prefer importing TypeScript files over JavaScript files
   --logError                      Logs TypeScript errors to stderr instead of throwing exceptions
   --noExperimentalReplAwait       Disable top-level await in REPL.  Equivalent to node's --no-experimental-repl-await
+  --experimentalSpecifierResolution [node|explicit]
+                                  Equivalent to node's --experimental-specifier-resolution
 `);
 
     process.exit(0);
@@ -361,6 +369,8 @@ function phase3(payload: BootstrapState) {
     argsRequire,
     scope,
     scopeDir,
+    esm,
+    experimentalSpecifierResolution,
   } = payload.parseArgvResult;
   const { cwd, scriptPath } = payload.phase2Result!;
 
@@ -388,6 +398,9 @@ function phase3(payload: BootstrapState) {
     scope,
     scopeDir,
     preferTsExts,
+    esm,
+    experimentalSpecifierResolution:
+      experimentalSpecifierResolution as ExperimentalSpecifierResolution,
   });
 
   if (preloadedConfig.options.esm) payload.shouldUseChildProcess = true;

src/file-extensions.ts

@@ -100,6 +100,7 @@ export function getExtensions(
   const replacementsForJs = r.filter((ext) =>
     ['.js', '.jsx', '.ts', '.tsx'].includes(ext)
   );
+  const replacementsForJsx = r.filter((ext) => ['.jsx', '.tsx'].includes(ext));
   const replacementsForMjs = r.filter((ext) => ['.mjs', '.mts'].includes(ext));
   const replacementsForCjs = r.filter((ext) => ['.cjs', '.cts'].includes(ext));
   const replacementsForJsOrMjs = r.filter((ext) =>
@@ -143,6 +144,7 @@ export function getExtensions(
     legacyMainResolveAddsIfOmitted,
     replacementsForMjs,
     replacementsForCjs,
+    replacementsForJsx,
     replacementsForJs,
   };
 }

src/index.ts

@@ -367,6 +367,12 @@ export interface CreateOptions {
    * @default false
    */
   preferTsExts?: boolean;
+  /**
+   * Like node's `--experimental-specifier-resolution`, , but can also be set in your `tsconfig.json` for convenience.
+   *
+   * For details, see https://nodejs.org/dist/latest-v18.x/docs/api/esm.html#customizing-esm-specifier-resolution-algorithm
+   */
+  experimentalSpecifierResolution?: 'node' | 'explicit';
 }
 
 export type ModuleTypes = Record<string, ModuleTypeOverride>;
@@ -394,9 +400,6 @@ export interface RegisterOptions extends CreateOptions {
    * For details, see https://github.com/TypeStrong/ts-node/issues/1514
    */
   experimentalResolver?: boolean;
-
-  /** @internal */
-  experimentalSpecifierResolution?: 'node' | 'explicit';
 }
 
 export type ExperimentalSpecifierResolution = 'node' | 'explicit';

website/docs/module-type-overrides.md

@@ -2,8 +2,8 @@
 title: Module type overrides
 ---
 
-> Wherever possible, it is recommended to use TypeScript's [`NodeNext` or `Node16` mode](https://devblogs.microsoft.com/typescript/announcing-typescript-4-7-rc/#ecmascript-module-support-in-node-js) instead of the options described
-in this section.  `NodeNext`, `.mts`, and `.cts` should work well for most projects.
+> Wherever possible, it is recommended to use TypeScript's [`NodeNext` or `Node16` mode](https://www.typescriptlang.org/docs/handbook/esm-node.html) instead of the options described
+in this section.  Setting `"module": "NodeNext"` and using the `.cts` file extension should work well for most projects.
 
 When deciding how a file should be compiled and executed -- as either CommonJS or native ECMAScript module -- ts-node matches
 `node` and `tsc` behavior.  This means TypeScript files are transformed according to your `tsconfig.json` `"module"`

website/docs/options.md

@@ -369,11 +369,35 @@ Disable top-level await in REPL.  Equivalent to node's [`--no-experimental-repl-
 
 ### experimentalResolver
 
-Enable experimental features that re-map imports and require calls to support: `baseUrl`, `paths`, `rootDirs`, `.js` to `.ts` file extension mappings, `outDir` to `rootDir` mappings for composite projects and monorepos.  For details, see [#1514](https://github.com/TypeStrong/ts-node/issues/1514)
+Enable experimental hooks that re-map imports and require calls to support:
 
-*Default:* `false`<br/>
+* resolves `.js` to `.ts`, so that `import "./foo.js"` will execute `foo.ts`
+* resolves `.cjs` to `.cts`
+* resolves `.mjs` to `.mts`
+* allows including file extensions in CommonJS, for consistency with ESM where this is often mandatory
+
+In the future, this hook will also support:
+
+* `baseUrl`, `paths`
+* `rootDirs`
+* `outDir` to `rootDir` mappings for composite projects and monorepos
+
+For details, see [#1514](https://github.com/TypeStrong/ts-node/issues/1514).
+
+*Default:* `false`, but will likely be enabled by default in a future version<br/>
 *Can only be specified via `tsconfig.json` or API.*
 
+### experimentalSpecifierResolution
+
+```shell
+ts-node --experimentalSpecifierResolution node
+```
+
+Like node's [`--experimental-specifier-resolution`](https://nodejs.org/dist/latest-v18.x/docs/api/esm.html#customizing-esm-specifier-resolution-algorithm), but can also be set in your `tsconfig.json` for convenience.
+Requires `esm` to be enabled.
+
+*Default:* `explicit`<br/>
+
 ## API Options
 
 The API includes [additional options](https://typestrong.org/ts-node/api/interfaces/RegisterOptions.html) not shown here.