feat: support native .node files, closes #303

skip-release

src/esbuild/index.ts

@@ -19,6 +19,7 @@ import { getBabel, truthy } from '../utils'
 import { PrettyError } from '../errors'
 import { transform } from 'sucrase'
 import { swcPlugin } from './swc'
+import { nativeNodeModulesPlugin } from './native-node-module'
 
 const getOutputExtensionMap = (
   pkgTypeField: string | undefined,
@@ -106,6 +107,7 @@ export async function runEsbuild(
         tsconfigResolvePaths: options.tsconfigResolvePaths,
       }),
     options.tsconfigDecoratorMetadata && swcPlugin(),
+    nativeNodeModulesPlugin(),
     postcssPlugin({ css }),
     sveltePlugin({ css }),
     ...(options.esbuildPlugins || []),

src/esbuild/native-node-module.ts

@@ -0,0 +1,43 @@
+import { Plugin } from 'esbuild'
+
+// Copied from https://github.com/evanw/esbuild/issues/1051#issuecomment-806325487
+export const nativeNodeModulesPlugin = (): Plugin => {
+  return {
+    name: 'native-node-modules',
+    setup(build) {
+      // If a ".node" file is imported within a module in the "file" namespace, resolve
+      // it to an absolute path and put it into the "node-file" virtual namespace.
+      build.onResolve({ filter: /\.node$/, namespace: 'file' }, (args) => ({
+        path: require.resolve(args.path, { paths: [args.resolveDir] }),
+        namespace: 'node-file',
+      }))
+
+      // Files in the "node-file" virtual namespace call "require()" on the
+      // path from esbuild of the ".node" file in the output directory.
+      build.onLoad({ filter: /.*/, namespace: 'node-file' }, (args) => ({
+        contents: `
+          import path from ${JSON.stringify(args.path)}
+          try { module.exports = require(path) }
+          catch {}
+        `,
+      }))
+
+      // If a ".node" file is imported within a module in the "node-file" namespace, put
+      // it in the "file" namespace where esbuild's default loading behavior will handle
+      // it. It is already an absolute path since we resolved it to one above.
+      build.onResolve(
+        { filter: /\.node$/, namespace: 'node-file' },
+        (args) => ({
+          path: args.path,
+          namespace: 'file',
+        })
+      )
+
+      // Tell esbuild's default loading behavior to use the "file" loader for
+      // these ".node" files.
+      const opts = build.initialOptions
+      opts.loader = opts.loader || {}
+      opts.loader['.node'] = 'file'
+    },
+  }
+}