chore: update dependencies (#35)

package.json

@@ -42,19 +42,19 @@
   },
   "homepage": "https://github.com/image-js/fast-png#readme",
   "devDependencies": {
-    "@types/jest": "^29.5.3",
-    "@types/node": "^20.4.2",
-    "eslint": "^8.45.0",
-    "eslint-config-cheminfo-typescript": "^11.3.1",
-    "jest": "^29.6.1",
+    "@types/jest": "^29.5.12",
+    "@types/node": "^20.11.17",
+    "eslint": "^8.56.0",
+    "eslint-config-cheminfo-typescript": "^12.1.0",
+    "jest": "^29.7.0",
     "pngjs": "^7.0.0",
-    "prettier": "^3.0.0",
-    "rimraf": "^5.0.1",
-    "ts-jest": "^29.1.1",
-    "typescript": "^5.1.6"
+    "prettier": "^3.2.5",
+    "rimraf": "^5.0.5",
+    "ts-jest": "^29.1.2",
+    "typescript": "^5.3.3"
   },
   "dependencies": {
-    "@types/pako": "^2.0.0",
+    "@types/pako": "^2.0.3",
     "iobuffer": "^5.3.2",
     "pako": "^2.1.0"
   }

src/PngDecoder.ts

@@ -152,7 +152,7 @@ export default class PngDecoder extends IOBuffer {
     image.height = this.readUint32();
     image.depth = checkBitDepth(this.readUint8());
 
-    const colorType: ColorType = this.readUint8();
+    const colorType = this.readUint8() as ColorType;
     this._colorType = colorType;
     let channels: number;
     switch (colorType) {
@@ -176,15 +176,15 @@ export default class PngDecoder extends IOBuffer {
     }
     this._png.channels = channels;
 
-    this._compressionMethod = this.readUint8();
+    this._compressionMethod = this.readUint8() as CompressionMethod;
     if (this._compressionMethod !== CompressionMethod.DEFLATE) {
       throw new Error(
         `Unsupported compression method: ${this._compressionMethod}`,
       );
     }
 
-    this._filterMethod = this.readUint8();
-    this._interlaceMethod = this.readUint8();
+    this._filterMethod = this.readUint8() as FilterMethod;
+    this._interlaceMethod = this.readUint8() as InterlaceMethod;
   }
 
   // https://www.w3.org/TR/PNG/#11PLTE

src/PngEncoder.ts

@@ -146,11 +146,13 @@ function checkInteger(value: number, name: string): number {
   throw new TypeError(`${name} must be a positive integer`);
 }
 
-function getColorType(data: ImageData): {
+interface GetColorTypeReturn {
   channels: number;
   depth: BitDepth;
   colorType: ColorType;
-} {
+}
+
+function getColorType(data: ImageData): GetColorTypeReturn {
   const { channels = 4, depth = 8 } = data;
   if (channels !== 4 && channels !== 3 && channels !== 2 && channels !== 1) {
     throw new RangeError(`unsupported number of channels: ${channels}`);
@@ -159,7 +161,11 @@ function getColorType(data: ImageData): {
     throw new RangeError(`unsupported bit depth: ${depth}`);
   }
 
-  const returnValue = { channels, depth, colorType: ColorType.UNKNOWN };
+  const returnValue: GetColorTypeReturn = {
+    channels,
+    depth,
+    colorType: ColorType.UNKNOWN,
+  };
   switch (channels) {
     case 4:
       returnValue.colorType = ColorType.TRUECOLOUR_ALPHA;

src/internalTypes.ts

@@ -1,24 +1,34 @@
-export enum ColorType {
-  UNKNOWN = -1,
-  GREYSCALE = 0,
-  TRUECOLOUR = 2,
-  INDEXED_COLOUR = 3,
-  GREYSCALE_ALPHA = 4,
-  TRUECOLOUR_ALPHA = 6,
-}
+export const ColorType = {
+  UNKNOWN: -1,
+  GREYSCALE: 0,
+  TRUECOLOUR: 2,
+  INDEXED_COLOUR: 3,
+  GREYSCALE_ALPHA: 4,
+  TRUECOLOUR_ALPHA: 6,
+} as const;
+// eslint-disable-next-line @typescript-eslint/no-redeclare
+export type ColorType = (typeof ColorType)[keyof typeof ColorType];
 
-export enum CompressionMethod {
-  UNKNOWN = -1,
-  DEFLATE = 0,
-}
+export const CompressionMethod = {
+  UNKNOWN: -1,
+  DEFLATE: 0,
+} as const;
+// eslint-disable-next-line @typescript-eslint/no-redeclare
+export type CompressionMethod =
+  (typeof CompressionMethod)[keyof typeof CompressionMethod];
 
-export enum FilterMethod {
-  UNKNOWN = -1,
-  ADAPTIVE = 0,
-}
+export const FilterMethod = {
+  UNKNOWN: -1,
+  ADAPTIVE: 0,
+} as const;
+// eslint-disable-next-line @typescript-eslint/no-redeclare
+export type FilterMethod = (typeof FilterMethod)[keyof typeof FilterMethod];
 
-export enum InterlaceMethod {
-  UNKNOWN = -1,
-  NO_INTERLACE = 0,
-  ADAM7 = 1,
-}
+export const InterlaceMethod = {
+  UNKNOWN: -1,
+  NO_INTERLACE: 0,
+  ADAM7: 1,
+} as const;
+// eslint-disable-next-line @typescript-eslint/no-redeclare
+export type InterlaceMethod =
+  (typeof InterlaceMethod)[keyof typeof InterlaceMethod];

src/types.ts

@@ -49,7 +49,7 @@ export interface DecodedPng {
   data: PngDataArray;
   depth: BitDepth;
   channels: number;
-  text: { [key: string]: string };
+  text: Record<string, string>;
   resolution?: PngResolution;
   palette?: IndexedColors;
   transparency?: Uint16Array;