fix #2720: adapt npm i --no-optional to scopes

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## Unreleased
+
+* Fix a regression with `npm install --no-optional` ([#2720](https://github.com/evanw/esbuild/issues/2720))
+
+    Normally when you install esbuild with `npm install`, npm itself is the tool that downloads the correct binary executable for the current platform. This happens because of how esbuild's primary package uses npm's `optionalDependencies` feature. However, if you deliberately disable this with `npm install --no-optional` then esbuild's install script will attempt to repair the installation by manually downloading and extracting the binary executable from the package that was supposed to be installed.
+
+    The change in version 0.16.0 to move esbuild's nested packages into the `@esbuild/` scope unintentionally broke this logic because of how npm's URL structure is different for scoped packages vs. normal packages. It was actually already broken for a few platforms earlier because esbuild already had packages for some platforms in the `@esbuild/` scope, but I didn't discover this then because esbuild's integration tests aren't run on all platforms. Anyway, this release contains some changes to the install script that should hopefully get this scenario working again.
+
 ## 0.16.1
 
 This is a hotfix for the previous release.

lib/npm/node-install.ts

@@ -197,7 +197,7 @@ function maybeOptimizePackage(binPath: string): void {
 async function downloadDirectlyFromNPM(pkg: string, subpath: string, binPath: string): Promise<void> {
   // If that fails, the user could have npm configured incorrectly or could not
   // have npm installed. Try downloading directly from npm as a last resort.
-  const url = `https://registry.npmjs.org/${pkg}/-/${pkg}-${ESBUILD_VERSION}.tgz`;
+  const url = `https://registry.npmjs.org/${pkg}/-/${pkg.replace('@esbuild/', '')}-${ESBUILD_VERSION}.tgz`;
   console.error(`[esbuild] Trying to download ${JSON.stringify(url)}`);
   try {
     fs.writeFileSync(binPath, extractFileFromTarGzip(await fetch(url), subpath));

lib/npm/node-platform.ts

@@ -99,7 +99,7 @@ function pkgForSomeOtherPlatform(): string | null {
 
 export function downloadedBinPath(pkg: string, subpath: string): string {
   const esbuildLibDir = path.dirname(require.resolve('esbuild'));
-  return path.join(esbuildLibDir, `downloaded-${pkg}-${path.basename(subpath)}`);
+  return path.join(esbuildLibDir, `downloaded-${pkg.replace('/', '-')}-${path.basename(subpath)}`);
 }
 
 export function generateBinPath(): { binPath: string, isWASM: boolean } {
@@ -261,7 +261,7 @@ for your current platform.`);
         'node_modules',
         '.cache',
         'esbuild',
-        `pnpapi-${pkg}-${ESBUILD_VERSION}-${path.basename(subpath)}`,
+        `pnpapi-${pkg.replace('/', '-')}-${ESBUILD_VERSION}-${path.basename(subpath)}`,
       );
       if (!fs.existsSync(binTargetPath)) {
         fs.mkdirSync(path.dirname(binTargetPath), { recursive: true });