Add applyImportMap help function

Author: ije

server/helpers.ts

@@ -1,7 +1,7 @@
 import { basename, dirname, globToRegExp, join } from "https://deno.land/[email protected]/path/mod.ts";
 import { JSONC } from "https://deno.land/x/[email protected]/src/jsonc.ts";
-import { findFile } from "../lib/fs.ts";
 import { createGenerator } from "https://esm.sh/@unocss/[email protected]";
+import { findFile } from "../lib/fs.ts";
 import log from "../lib/log.ts";
 import util from "../lib/util.ts";
 import { isCanary, VERSION } from "../version.ts";
@@ -28,7 +28,7 @@ export function getAlephPkgUri() {
 export function getUnoGenerator() {
   return globalIt("__UNO_GENERATOR", () => {
     const config: AlephConfig | undefined = Reflect.get(globalThis, "__ALEPH_CONFIG");
-    if (config?.unocss?.presets?.length) {
+    if (config?.unocss?.presets) {
       return createGenerator(config.unocss);
     }
     return null;
@@ -271,6 +271,19 @@ export async function parseImportMap(importMapFile: string): Promise<ImportMap>
   return importMap;
 }
 
+export function applyImportMap(specifier: string, importMap: ImportMap): string {
+  if (specifier in importMap.imports) {
+    return importMap.imports[specifier];
+  }
+  for (const key in importMap.imports) {
+    if (key.endsWith("/") && specifier.startsWith(key)) {
+      return importMap.imports[key] + specifier.slice(key.length);
+    }
+  }
+  // todo: support scopes
+  return specifier;
+}
+
 function toStringMap(v: unknown): Record<string, string> {
   const m: Record<string, string> = {};
   if (util.isPlainObject(v)) {

tests/server_helpers_test.ts

@@ -1,5 +1,5 @@
 import { assertEquals } from "std/testing/asserts.ts";
-import { restoreUrl, toLocalPath } from "../server/helpers.ts";
+import { applyImportMap, restoreUrl, toLocalPath } from "../server/helpers.ts";
 
 Deno.test("lib/helpers.ts: toLocalPath", () => {
   assertEquals(toLocalPath("https://foo.com/[email protected]?action"), "/-/foo.com/[email protected]?action");
@@ -16,3 +16,19 @@ Deno.test("lib/helpers.ts: restoreUrl", () => {
   assertEquals(restoreUrl("/-/http_foo.com/bar?lang=us-en"), "http://foo.com/bar?lang=us-en");
   assertEquals(restoreUrl("/-/http_foo.com_8080/bar"), "http://foo.com:8080/bar");
 });
+
+Deno.test("lib/helpers.ts: applyImportMap", () => {
+  const importMap = {
+    __filename: "",
+    imports: {
+      "aleph": "https://deno.land/x/aleph/mod.ts",
+      "aleph/": "https://deno.land/x/aleph/",
+    },
+    scopes: {},
+  };
+  assertEquals(applyImportMap("aleph", importMap), "https://deno.land/x/aleph/mod.ts");
+  assertEquals(
+    applyImportMap("aleph/framework/react/mod.ts", importMap),
+    "https://deno.land/x/aleph/framework/react/mod.ts",
+  );
+});