Support provider configuration, with JSPM cdnUrl configuration

src/generator.ts

@@ -40,7 +40,7 @@ import { Replacer } from "./common/str.js";
 import { analyzeHtml } from "./html/analyze.js";
 import { InstallTarget, type InstallMode } from "./install/installer.js";
 import { LockResolutions } from "./install/lock.js";
-import { getDefaultProviderStrings, type Provider } from "./providers/index.js";
+import { configureProviders, getDefaultProviderStrings, type Provider } from "./providers/index.js";
 import * as nodemodules from "./providers/nodemodules.js";
 import { Resolver } from "./trace/resolver.js";
 import { getMaybeWrapperUrl } from "./common/wrapper.js";
@@ -315,6 +315,24 @@ export interface GeneratorOptions {
    * Defaults to 3.
    */
   fetchRetries?: number;
+
+  /**
+   * Provider configuration options
+   * 
+   * @example
+   * ```js
+   * const generator = new Generator({
+   *   mapUrl: import.meta.url,
+   *   defaultProvider: "jspm.io",
+   *   providerConfig: {
+   *     "jspm.io": {
+   *       cdnUrl: `https://jspm-mirror.com/`
+   *     }
+   *   }
+   */
+  providerConfig?: {
+    [providerName: string]: any;
+  };
 }
 
 export interface ModuleAnalysis {
@@ -408,6 +426,7 @@ export class Generator {
     typeScript = false,
     integrity = false,
     fetchRetries,
+    providerConfig = {},
   }: GeneratorOptions = {}) {
     // Initialise the debug logger:
     const { log, logStream } = createLogger();
@@ -524,6 +543,8 @@ export class Generator {
     // Set the fetch retry count
     if (typeof fetchRetries === 'number')
       setRetryCount(fetchRetries);
+
+    configureProviders(providerConfig, resolver.providers);
   }
 
   /**

src/providers/index.ts

@@ -50,6 +50,8 @@ export interface Provider {
   ): Promise<PackageConfig | null>;
 
   supportedLayers?: string[];
+
+  configure?(config: any): void;
 }
 
 export const defaultProviders: Record<string, Provider> = {
@@ -68,6 +70,15 @@ export function getProvider(name: string, providers: Record<string, Provider>) {
   throw new JspmError(`No provider named "${name}" has been defined.`);
 }
 
+// Apply provider configurations
+export function configureProviders(providerConfig: Record<string, any>, providers: Record<string, Provider>) {
+  for (const [providerName, provider] of Object.entries(providers)) {
+    if (provider.configure) {
+      provider.configure(providerConfig[providerName] || {});
+    }
+  }
+}
+
 export function getDefaultProviderStrings() {
   let res = [];
   for (const [name, provider] of Object.entries(defaultProviders)) {

src/providers/jspm.ts

@@ -9,7 +9,7 @@ import { SemverRange } from "sver";
 // @ts-ignore
 import { fetch } from "#fetch";
 
-const cdnUrl = "https://ga.jspm.io/";
+let cdnUrl = "https://ga.jspm.io/";
 const systemCdnUrl = "https://ga.system.jspm.io/";
 const apiUrl = "https://api.jspm.io/";
 
@@ -25,6 +25,10 @@ export async function pkgToUrl(
   return `${layer === "system" ? systemCdnUrl : cdnUrl}${pkgToStr(pkg)}/`;
 }
 
+export function configure(config: any) {
+  cdnUrl = config.cdnUrl || "https://ga.jspm.io/";
+}
+
 const exactPkgRegEx =
   /^(([a-z]+):)?((?:@[^/\\%@]+\/)?[^./\\%@][^/\\%@]*)@([^\/]+)(\/.*)?$/;
 

test/providers/config.test.js

@@ -0,0 +1,26 @@
+import { Generator } from "@jspm/generator";
+import assert from "assert";
+
+// this private origin shouldn't really be shared publicly
+const name = [111, 97, 107, 116, 105, 113].map(x => String.fromCharCode(x)).reverse().join('');
+
+// Test with custom CDN URL
+{
+  const generator = new Generator({
+    mapUrl: import.meta.url,
+    defaultProvider: "jspm.io",
+    providerConfig: {
+      "jspm.io": {
+        cdnUrl: `https://${name}.com/`
+      }
+    }
+  });
+
+  await generator.install("react@17.0.1");
+  const json = generator.getMap();
+
+  assert.strictEqual(
+    json.imports.react,
+    `https://${name}.com/npm:react@17.0.1/dev.index.js`
+  );
+}