[qrcode-svg] Add types for qrcode-svg module

This commit adds the QRCode class, along with the associated types in a namespace of the same name. It also adds a couple tests to validate the main parts are as expected.

types/qrcode-svg/index.d.ts

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+// Type definitions for qrcode-svg 1.0
+// Project: https://github.com/papnkukn/qrcode-svg
+// Definitions by: Eric Ferreira <https://github.com/ericbf>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare class QRCode {
+	constructor(content: string);
+	constructor(options: QRCode.Options);
+
+    qrcode: QRCode.Model;
+    options: QRCode.Options;
+
+	/**
+	 * Generates QR Code as SVG image
+	 * @param  opt Set the container. Defaults to `{ container: "svg" }`.
+	 * @return The svg string.
+	 */
+	svg(opt?: {
+		container: "svg" | "g" | "none"
+	}): string;
+	/**
+	 * Writes QR Code image to a file. Requires `fs`.
+	 * @param  file The filename to write to
+	 * @param  callback The callback that will be called, possibly with an error, when done.
+	 */
+	save(file: string, callback: (error?: Error) => void): void;
+}
+
+declare namespace QRCode {
+    interface Options {
+        /** Default is `"#ffffff"`. */
+        background?: string;
+        /** Default is `"#000000"`. */
+        color?: string;
+        /** The actual content of the QR code */
+        content: string;
+        /** Default is `"M"`. */
+        ecl?: "L" | "M" | "H" | "Q";
+        /** Default is `256`. */
+        height?: number;
+        /** Default is `4`. */
+        padding?: number;
+        /** Default is `256`. */
+        width?: number;
+        /** Default is `4`. */
+        typeNumber?: number;
+    }
+
+    interface Model {
+        modules: boolean[][];
+        typeNumber: number;
+        errorCorrectLevel: number;
+        moduleCount: number;
+        dataCache: number[] | null;
+        dataList: Array<{
+            data: string;
+            mode: number;
+            parsedData: number[];
+        }>;
+
+        addData(data: string): void;
+        isDark(row: number, col: number): boolean;
+        getModuleCount(): number;
+        make(): void;
+    }
+}
+
+export = QRCode;

types/qrcode-svg/qrcode-svg-tests.ts

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+import * as QRCode from "qrcode-svg";
+
+const qrCode = new QRCode(`sample-data`);
+
+const assert = (result: boolean, messagePrefix: string, successMessage: string, errorMessage: string) => {
+    if (result) {
+        console.log(`${messagePrefix} ${successMessage}`);
+    } else {
+        console.error(`${messagePrefix} ${errorMessage}`);
+    }
+};
+
+assert(qrCode.options.padding === 4, "Default value for padding", "matches expected.", "does not match expected.");
+assert(qrCode.options.width === 256, "Default value for width", "matches expected.", "does not match expected.");
+assert(qrCode.options.height === 256, "Default value for height", "matches expected.", "does not match expected.");
+assert(qrCode.options.typeNumber === 4, "Default value for typeNumber", "matches expected.", "does not match expected.");
+assert(qrCode.options.background === "#ffffff", "Default value for background", "matches expected.", "does not match expected.");
+assert(qrCode.options.color === "#000000", "Default value for color", "matches expected.", "does not match expected.");
+
+assert(Array.isArray(qrCode.qrcode.modules) &&
+    qrCode.qrcode.modules.length === 0 ||
+        Array.isArray(qrCode.qrcode.modules[0]), "Modules in qrcode is", "a two-dimensional array", "not a two-dimensional array");
+
+assert(typeof qrCode.svg() === "string", "QRCode", "generated an svg string", "did not generate an svg string");

types/qrcode-svg/tsconfig.json

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

types/qrcode-svg/tslint.json

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+{
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "unified-signatures": false
+    }
+}