make types more stricter

Author: Yankovsky

src/types.ts

@@ -1,11 +1,15 @@
 export type Dpr = '1x' | '2x' | '3x';
 
 export type CompressionRatio = {
-  [dpr in Dpr]?: number;
+  "1x": number;
+  "2x"?: number;
+  "3x"?: number;
 }
 
 export type SrcSet = {
-  [dpr in Dpr]?: string;
+  "1x": string;
+  "2x"?: string;
+  "3x"?: string;
 };
 
 export type ExtensionSrcSet = {

src/utils/getCompressionRatio.ts

@@ -5,13 +5,13 @@ import { Dpr, CompressionRatio } from '../types'
 export const getCompressionRatio = (pixelRatios: Dpr[]): CompressionRatio => {
   const length = pixelRatios.length;
 
-  return pixelRatios.reduce((acc: CompressionRatio, item: Dpr, index: number) => {
+  return pixelRatios.reduce((acc, item, index) => {
       if (index + 1 === length) {
         acc[item]= 0
         return acc
       }
 
       acc[item] = (index + 1) / length
       return acc
-  },{})
+  },{} as CompressionRatio)
 }

src/webpack/imgproxyUrlBuilder.ts

@@ -28,9 +28,9 @@ export const getImgproxyUrlBuilder = ({
   return (pixelRatios: Dpr[], imagePath: string, extension: string): SrcSet => {
     const compressionsRatio = getCompressionRatio(pixelRatios)
 
-    return pixelRatios.reduce((acc:SrcSet, item: Dpr) => {
+    return pixelRatios.reduce((acc, item) => {
       acc[item] = buildImgproxyUrl(imagePath, compressionsRatio[item] || 0, extension)
       return acc
-    },{})
+    }, {} as SrcSet)
   }
 };