Attempt to fix #318

src/helpers.ts

@@ -1,5 +1,6 @@
 import * as path from "path";
 import * as fs from "fs";
+import { platform } from "process";
 import sharp from "sharp";
 import { toIco } from "./ico";
 import { FaviconImage } from "./index";
@@ -90,7 +91,7 @@ export async function sourceImages(
     if (!src.length) {
       throw new Error("No source provided");
     }
-    const images = await Promise.all(src.map(sourceImages));
+    const images = await mapAsync(src, sourceImages);
 
     return images.flat();
   } else {
@@ -244,14 +245,12 @@ export class Images {
     const properties = flattenIconOptions(iconOptions);
 
     if (path.extname(name) === ".ico" || properties.length !== 1) {
-      const images = await Promise.all(
-        properties.map((props) =>
-          this.createPlaneFavicon(
-            sourceset,
-            props,
-            `${props.width}x${props.height}.rawdata`,
-            true
-          )
+      const images = await mapAsync(properties, (props) =>
+        this.createPlaneFavicon(
+          sourceset,
+          props,
+          `${props.width}x${props.height}.rawdata`,
+          true
         )
       );
       const contents = toIco(images.map((image) => image.contents as RawImage));
@@ -265,3 +264,21 @@ export class Images {
     return await this.createPlaneFavicon(sourceset, properties[0], name, false);
   }
 }
+
+export async function mapAsync<T, U>(
+  inputs: T[],
+  computation: (input: T, index: number) => Promise<U>
+): Promise<U[]> {
+  if (platform === "win32") {
+    // run sequentially
+    const result: U[] = [];
+    let index = 0;
+    for (const input of inputs) {
+      result.push(await computation(input, index));
+      index++;
+    }
+    return result;
+  } else {
+    return await Promise.all(inputs.map(computation));
+  }
+}

src/platforms/android.ts

@@ -5,6 +5,7 @@ import { maskable, transparentIcon } from "../config/icons";
 import {
   Dictionary,
   Images,
+  mapAsync,
   relativeTo,
   SourceImage,
   sourceImages,
@@ -69,10 +70,10 @@ export class AndroidPlatform extends Platform {
   async createImages(sourceset: SourceImage[]): Promise<FaviconImage[]> {
     const images = new Images();
 
-    let icons = await Promise.all(
-      Object.entries(this.iconOptions).map(([iconName, iconOption]) =>
+    let icons = await mapAsync(
+      Object.entries(this.iconOptions),
+      ([iconName, iconOption]) =>
         images.createFavicon(sourceset, iconName, iconOption)
-      )
     );
 
     // Generate android maskable images from a different source set
@@ -84,10 +85,10 @@ export class AndroidPlatform extends Platform {
         this.options.manifestMaskable
       );
 
-      const maskable = await Promise.all(
-        Object.entries(ICONS_OPTIONS_MASKABLE).map(([iconName, iconOption]) =>
+      const maskable = await mapAsync(
+        Object.entries(ICONS_OPTIONS_MASKABLE),
+        ([iconName, iconOption]) =>
           images.createFavicon(maskableSourceset, iconName, iconOption)
-        )
       );
 
       icons = [...icons, ...maskable];
@@ -122,20 +123,21 @@ export class AndroidPlatform extends Platform {
 
   private async shortcutIcons(): Promise<FaviconImage[]> {
     const images = new Images();
-    const icons = await Promise.all(
-      this.options.shortcuts.map(async (shortcut, index) => {
+    const icons = await mapAsync(
+      this.options.shortcuts,
+      async (shortcut, index) => {
         if (!shortcut.name || !shortcut.url || !shortcut.icon) return null;
         const shortcutSourceset = await sourceImages(shortcut.icon);
-        return Promise.all(
-          Object.entries(SHORTCUT_ICONS_OPTIONS).map(([shortcutName, option]) =>
+        return await mapAsync(
+          Object.entries(SHORTCUT_ICONS_OPTIONS),
+          ([shortcutName, option]) =>
             images.createFavicon(
               shortcutSourceset,
               `shortcut${index + 1}-${shortcutName}`,
               option
             )
-          )
         );
-      })
+      }
     );
     return icons.flat();
   }

src/platforms/base.ts

@@ -11,6 +11,7 @@ import {
   filterKeys,
   Images,
   mapValues,
+  mapAsync,
   relativeTo,
   SourceImage,
 } from "../helpers";
@@ -62,10 +63,10 @@ export class Platform<IO extends IconOptions = IconOptions> {
 
   async createImages(sourceset: SourceImage[]): Promise<FaviconImage[]> {
     const images = new Images();
-    return await Promise.all(
-      Object.entries(this.iconOptions).map(([iconName, iconOption]) =>
+    return await mapAsync(
+      Object.entries(this.iconOptions),
+      ([iconName, iconOption]) =>
         images.createFavicon(sourceset, iconName, iconOption)
-      )
     );
   }