feat: support alternative/private NPM registries (#143)

Author: lucacasonato

mod_test.ts

@@ -462,6 +462,38 @@ Deno.test("npm specifiers global resolver - express", async (t) => {
   });
 });
 
+Deno.test("npm specifiers global resolver with alternative registry", {
+  ignore: Deno.version.deno.startsWith("1."),
+}, async (t) => {
+  await testLoader(t, ["native"], async (esbuild, loader) => {
+    if (esbuild === PLATFORMS.wasm) return;
+    const res = await esbuild.build({
+      ...DEFAULT_OPTS,
+      plugins: [
+        ...denoPlugins({
+          loader,
+          configPath: Deno.realPathSync("./testdata/npmrc/deno.json"),
+        }),
+      ],
+      absWorkingDir: Deno.realPathSync("./testdata/npmrc"),
+      bundle: true,
+      entryPoints: ["./main.ts"],
+      platform: "node",
+    });
+    assertEquals(res.warnings, []);
+    assertEquals(res.errors, []);
+    assertEquals(res.outputFiles.length, 1);
+    const output = res.outputFiles[0];
+    assertEquals(output.path, "<stdout>");
+    assert(!output.text.includes(`npm:`));
+    const { default: chalk } = await import(
+      `data:application/javascript;base64,${btoa(output.text)}`
+    );
+    assertEquals(typeof chalk, "function");
+    assertEquals(typeof chalk.red, "function");
+  });
+});
+
 Deno.test("npm specifiers local resolver (manual) - preact", async (t) => {
   await testLoader(t, LOADERS, async (esbuild, loader) => {
     if (esbuild === PLATFORMS.wasm) return;

src/deno.ts

@@ -95,6 +95,7 @@ export interface NpmPackage {
   name: string;
   version: string;
   dependencies: string[];
+  registryUrl?: string;
 }
 
 export interface InfoOptions {

src/loader_native.ts

@@ -140,15 +140,19 @@ export class NativeLoader implements Loader {
       ROOT_INFO_OUTPUT = await ROOT_INFO_OUTPUT;
     }
     const { denoDir, npmCache } = ROOT_INFO_OUTPUT;
+    const registryUrl = npmPackage.registryUrl ?? "https://registry.npmjs.org";
+    const registry = new URL(registryUrl);
+
     const packageDir = join(
       npmCache,
-      "registry.npmjs.org",
+      registry.hostname,
       name,
       npmPackage.version,
     );
     const linkDir = join(
       denoDir,
       "deno_esbuild",
+      registry.hostname,
       npmPackageId,
       "node_modules",
       name,

testdata/npmrc/.npmrc

@@ -0,0 +1 @@
+registry=https://registry.npmmirror.com/

testdata/npmrc/deno.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "chalk": "npm:chalk@^5.3.0"
+  }
+}

testdata/npmrc/deno.lock

@@ -0,0 +1,2 @@
+import chalk from "chalk";
+export default chalk;