fix: allow to install icon packages individually

src/core.ts

@@ -2,18 +2,44 @@ import path from "path"
 import fs from "fs"
 import { IconifyJSON } from "@iconify/types"
 import { getIconCSS, getIconData } from "@iconify/utils"
+import { createRequire } from "module"
 import { CollectionNames } from "../types"
 
+declare const TSUP_FORMAT: "esm" | "cjs"
+const req =
+  typeof TSUP_FORMAT === "undefined" || TSUP_FORMAT === "cjs"
+    ? require
+    : createRequire(import.meta.url)
+
 const localResolve = (cwd: string, id: string) => {
-  const resolved = require.resolve(id, { paths: [cwd] })
+  const resolved = req.resolve(id, { paths: [cwd] })
   return resolved
 }
 
 export const getIconCollections = (
   include: CollectionNames[] | "all" = "all",
 ) => {
   const pkgPath = localResolve(process.cwd(), "@iconify/json/package.json")
-  if (!pkgPath) return {}
+  if (!pkgPath) {
+    if (Array.isArray(include)) {
+      return include.reduce((result, name) => {
+        const jsonPath = localResolve(
+          process.cwd(),
+          `@iconify-json/${name}/icons.json`,
+        )
+        if (!jsonPath) {
+          throw new Error(
+            `Icon collection "${name}" not found. Please install @iconify-json/${name} or @iconify/json`,
+          )
+        }
+        return {
+          ...result,
+          [name]: req(jsonPath),
+        }
+      }, {})
+    }
+    return {}
+  }
   const pkgDir = path.dirname(pkgPath)
   const files = fs.readdirSync(path.join(pkgDir, "json"))
   const collections: Record<string, IconifyJSON> = {}
@@ -22,7 +48,7 @@ export const getIconCollections = (
       include === "all" ||
       include.includes(file.replace(".json", "") as any)
     ) {
-      const json: IconifyJSON = require(path.join(pkgDir, "json", file))
+      const json: IconifyJSON = req(path.join(pkgDir, "json", file))
       collections[json.prefix] = json
     }
   }