fix(core): enfore to esm if file extensions match (#55)

Author: Brooooooklyn

packages/integrate-module-bundler/src/enforce-mts/index.mts

@@ -0,0 +1 @@
+export const exportFromMts = 'exportFromMts'

packages/integrate-module-bundler/src/enforce-mts/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

packages/integrate-module-bundler/src/index.ts

@@ -15,7 +15,7 @@ import { baz } from './subdirectory/index'
 import { Component } from './component'
 import './js-module'
 import babelGeneratedDoubleDefault from './babel-generated-double-default'
-
+import { exportFromMts } from './enforce-mts/index.mjs'
 const { foo: fooWithQuery } = await import(`./foo.js?q=${Date.now()}`)
 
 await test('file-type should work', () => {
@@ -66,3 +66,7 @@ await test('import default from babel-generated cjs file', () => {
 await test('resolve cjs in type module package', () => {
   assert.equal(common, 'common')
 })
+
+await test('resolve mts in type commonjs package', () => {
+  assert.equal(exportFromMts, 'exportFromMts')
+})

src/lib.rs

@@ -420,22 +420,20 @@ pub fn create_resolve<'env>(
                     let ext = p.extension().and_then(|ext| ext.to_str());
 
                     let format = ext
-                        .and_then(|ext| {
-                            if ext == "cjs" || ext == "cts" || ext == "node" {
-                                None
-                            } else {
-                                resolution
-                                    .package_json()
-                                    .and_then(|p| p.r#type.as_ref())
-                                    .and_then(|t| t.as_str())
-                                    .and_then(|format| {
-                                        if format == "module" {
-                                            Some("module".to_owned())
-                                        } else {
-                                            None
-                                        }
-                                    })
-                            }
+                        .and_then(|ext| match ext {
+                            "cjs" | "cts" | "node" => None,
+                            "mts" | "mjs" => Some("module".to_owned()),
+                            _ => resolution
+                                .package_json()
+                                .and_then(|p| p.r#type.as_ref())
+                                .and_then(|t| t.as_str())
+                                .and_then(|format| {
+                                    if format == "module" {
+                                        Some("module".to_owned())
+                                    } else {
+                                        None
+                                    }
+                                }),
                         })
                         .unwrap_or_else(|| "commonjs".to_owned());
                     tracing::debug!(path = ?p, format = ?format);