fix: import resolve find in paths's node_modules (#35)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Enhanced module resolution to search for modules within the
`node_modules` directory
- Added support for resolving both CommonJS and ECMAScript (ESM)
packages

- **Tests**
- Expanded test coverage for package resolution in different module
systems

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

src/import.ts

@@ -202,6 +202,17 @@ export function importResolve(filepath: string, options?: ImportResolveOptions)
     }
   }
 
+  // find from node_modules
+  for (const p of paths) {
+    const resolvedPath = path.join(p, 'node_modules', filepath);
+    moduleFilePath = tryToResolveFromAbsoluteFile(resolvedPath);
+    if (moduleFilePath) {
+      debug('[importResolve:node_modules] %o => %o => %o',
+        filepath, resolvedPath, moduleFilePath);
+      return moduleFilePath;
+    }
+  }
+
   const extname = path.extname(filepath);
   if ((!isAbsolute && extname === '.json') || !isESM) {
     moduleFilePath = getRequire().resolve(filepath, {

test/import.test.ts

@@ -27,6 +27,12 @@ describe('test/import.test.ts', () => {
       }), getFilepath('cjs/index.js'));
     });
 
+    it('should inject commonjs package from {paths}/node_modules', () => {
+      assert.equal(importResolve('inject', {
+        paths: [ getFilepath('cjs') ],
+      }), getFilepath('cjs/node_modules/inject/index.js'));
+    });
+
     it('should work on commonjs and require exists', () => {
       return coffee.fork(getFilepath('cjs/run.js'))
         // .debug()
@@ -49,6 +55,12 @@ describe('test/import.test.ts', () => {
       }, /Cannot find module/);
     });
 
+    it('should inject esm package from {paths}/node_modules', () => {
+      assert.equal(importResolve('inject', {
+        paths: [ getFilepath('esm') ],
+      }), getFilepath('esm/node_modules/inject/index.js'));
+    });
+
     it('should work on ts-module', () => {
       assert.equal(importResolve(getFilepath('ts-module')), getFilepath('ts-module/index.ts'));
       assert.equal(importResolve(getFilepath('ts-module/extend')), getFilepath('ts-module/extend/index.ts'));