types for downscale - uses esmoduleinterop for export default (#41493)

* types for downscale - uses esmoduleinterop for export default

* umd declaration added

types/downscale/downscale-tests.ts

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+import downscale from 'downscale';
+
+const image = new HTMLImageElement();
+const video = new HTMLVideoElement();
+const file = new File([], 'abc');
+const string = '';
+
+downscale(image, 0, 0);
+downscale(video, 0, 0);
+downscale(file, 0, 0);
+downscale(string, 0, 0);
+
+async function doTheTests() {
+    const string_returned: string = await downscale(image, 0, 0);
+
+    const canvas_returned: HTMLCanvasElement = await downscale(image, 0, 0, { returnCanvas: true });
+
+    const blob_returned: Blob = await downscale(image, 0, 0, { returnBlob: true });
+}

types/downscale/index.d.ts

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+// Type definitions for downscale 1.0
+// Project: https://github.com/ytiurin/downscale
+// Definitions by: Gabriel Soicher <https://github.com/Lunrtick>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type ImageSource = File | HTMLImageElement | HTMLVideoElement | string;
+
+interface DownscaleOptions {
+    imageType?: string;
+    quality?: number;
+    returnBlob?: boolean;
+    returnCanvas?: boolean;
+    sourceX?: number;
+    sourceY?: number;
+}
+
+/**
+ * Overloads that automatically type the return value based on the selected options
+ */
+declare function downscale(source: ImageSource, width: number, height: number, options?: DownscaleOptions & { returnBlob?: false; returnCanvas?: false; }): Promise<string>;
+declare function downscale(source: ImageSource, width: number, height: number, options?: DownscaleOptions & { returnBlob: true; }): Promise<Blob>;
+declare function downscale(source: ImageSource, width: number, height: number, options?: DownscaleOptions & { returnCanvas: true; }): Promise<HTMLCanvasElement>;
+
+export = downscale;
+
+export as namespace downscale;

types/downscale/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "DOM"
+        ],
+        "esModuleInterop": true,
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "downscale-tests.ts"
+    ]
+}

types/downscale/tslint.json

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+{ "extends": "dtslint/dt.json" }