chore: add typings (#9)

index.d.ts

@@ -0,0 +1,36 @@
+declare const Buffer
+
+type ColorString = string
+type ColorArr = number[]
+type RGBA = ColorString | ColorArr
+
+declare class NodePnglib {
+    constructor(
+        width: number,
+        height: number,
+        /** Color depth of the png, default to 8. */
+        depth?: number,
+        /** For example: [1, 1, 1, 1], 'blue', 'transparent' or 'rgba(1, 1, 1, 1)', default to [0, 0, 0, 0]. */
+        backgroundColor?: RGBA
+    )
+
+    index(x: number, y: number): number
+
+    color(rgba: RGBA)
+
+    setBgColor(rgba: RGBA): number
+
+    setPixel(x: number, y: number, rgba: RGBA): void
+
+    getBase64(): string
+
+    getBuffer(): Buffer
+
+    deflate(): Buffer
+}
+
+declare namespace NodePnglib {
+    export type Color = RGBA
+}
+
+export = NodePnglib

package.json

@@ -6,6 +6,7 @@
   "engines": {
     "node": ">=4.4.0"
   },
+  "typings": "./index.d.ts",
   "scripts": {
     "build": "babel src/ -d lib/",
     "dev": "babel src/ --watch -d lib/",