Attempt to fix #318

src/helpers.ts

@@ -244,14 +244,12 @@ 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 promiseAllSequentially(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 +263,14 @@ export class Images {
     return await this.createPlaneFavicon(sourceset, properties[0], name, false);
   }
 }
+
+export async function promiseAllSequentially<T, U>(
+  inputs: T[],
+  computation: (input: T) => Promise<U>
+): Promise<U[]> {
+  const result: U[] = [];
+  for (const input of inputs) {
+    result.push(await computation(input));
+  }
+  return result;
+}

src/platforms/base.ts

@@ -11,6 +11,7 @@ import {
   filterKeys,
   Images,
   mapValues,
+  promiseAllSequentially,
   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 promiseAllSequentially(
+      Object.entries(this.iconOptions),
+      ([iconName, iconOption]) =>
         images.createFavicon(sourceset, iconName, iconOption)
-      )
     );
   }