ts conversion, init

Author: mster

.prettierignore

@@ -0,0 +1,2 @@
+node_modules
+.github

.prettierrc.json

@@ -0,0 +1,6 @@
+{
+    "trailingComma": "es5",
+    "tabWidth": 4,
+    "semi": false,
+    "singleQuote": true
+}

.travis.yml

@@ -1,3 +1,3 @@
 language: node_js
 node_js:
-  - 14
+    - 14

CONTRIBUTING.md

@@ -12,9 +12,9 @@ Your mosh mode doesn't have to do anything specific -- if you think it's cool, w
 
 Most of Datamosh's current modes overwrite existing Red/Green/Blue (RGB) pixel values with something random. If you get stuck or just need some inspiration, check out these examples.
 
-- [Vana mode](https://github.com/mster/datamosh/blob/master/lib/modes/vana.js)
-- [Schifty mode](https://github.com/mster/datamosh/blob/master/lib/modes/schifty.js)
-- [Before and after images](https://github.com/mster/datamosh#example-images)
+-   [Vana mode](https://github.com/mster/datamosh/blob/master/lib/modes/vana.js)
+-   [Schifty mode](https://github.com/mster/datamosh/blob/master/lib/modes/schifty.js)
+-   [Before and after images](https://github.com/mster/datamosh#example-images)
 
 Once you have a stub function and some cool name for it, you'll want to import it into Datamosh.
 
@@ -28,14 +28,14 @@ To import your mode, you have two options:
 1. Fork datamosh and run `npm install` within the directory.
 2. On your fork, create a new branch named `username/work-description`, where `username` is your GitHub username and `work-description` is a short description for your contribution.
 
-   For example: `mster/new-mode`
+    For example: `mster/new-mode`
 
 3. Commit your work to the branch you created.
 4. When you're ready for review or to submit your contribution, double check a few things.
 
-- ✓ First, make sure your fork is up to date. If your fork is out of date, you will need to rebase.
+-   ✓ First, make sure your fork is up to date. If your fork is out of date, you will need to rebase.
 
-- ✓ Next, assure that your code pases `npm test`.
+-   ✓ Next, assure that your code pases `npm test`.
 
 5. If your contribution is more than a single commit, squash all commits into one.
 6. Open a pull request to `mster:master`.
@@ -57,7 +57,7 @@ To test if your code passes, run the test command:
 
 As of v1.0.0, tests consist of:
 
-- linting using Prettier
+-   linting using Prettier
 
 ## Need Help
 

README.md

@@ -13,17 +13,17 @@ $ npm install datamosh
 # Usage
 
 ```js
-const mosh = require("datamosh");
+const mosh = require('datamosh')
 
-let imgBuff = await readFile("/full/path/to/image.png");
+let imgBuff = await readFile('/full/path/to/image.png')
 
-let moshedBuff = await mosh(imgBuff, "vaporwave");
+let moshedBuff = await mosh(imgBuff, 'vaporwave')
 ```
 
 Reading/Writing the moshed image
 
 ```js
-mosh("~/image.png", null, "~/moshed_image.png");
+mosh('~/image.png', null, '~/moshed_image.png')
 
 // because mode is null, a random mode will be chosen
 ```
@@ -32,16 +32,16 @@ Moshing a buffer with callbacks
 
 ```js
 const cb = (err, data) => {
-  if (!err) writeFile("/path/to/out.gif", data);
-};
+    if (!err) writeFile('/path/to/out.gif', data)
+}
 
-mosh(imgBuff, "vana", cb);
+mosh(imgBuff, 'vana', cb)
 ```
 
 Using multiple modes on a single image, applied with respect to order.
 
 ```js
-let moshedBuff = await mosh(imgBuff, ["fatcat", "vaporwave", "walter"]);
+let moshedBuff = await mosh(imgBuff, ['fatcat', 'vaporwave', 'walter'])
 
 // ['vana', null, null] is also valid => ['vana', random, random]
 ```
@@ -52,9 +52,9 @@ let moshedBuff = await mosh(imgBuff, ["fatcat", "vaporwave", "walter"]);
 
 Takes input `source` Buffer/Path, returns an encoded Buffer with the applied modes.
 
-- `mode`, the mosh mode to apply to the source image. Multiple modes may be passed using an array of modes. Any `null` values are replaced with a random mode.
-- `cb (err, data)`, when using callbacks.
-- `writePath`, the path to write the moshed image to.
+-   `mode`, the mosh mode to apply to the source image. Multiple modes may be passed using an array of modes. Any `null` values are replaced with a random mode.
+-   `cb (err, data)`, when using callbacks.
+-   `writePath`, the path to write the moshed image to.
 
 Paths may use the tilde (~) character. Datamosh validates read and write paths, replacing tilde with the path to the home directory.
 
@@ -69,15 +69,15 @@ Datamosh allows you to set custom moshing modes. As of `v1.1.0`, this may be aco
 For mosh function starter code, see the included template file located [here](https://github.com/mster/datamosh/blob/master/lib/modes/template).
 
 ```js
-const datamosh = require("datamosh");
+const datamosh = require('datamosh')
 
 function newMode(data, width, height) {
-  // your cool code goes here!
+    // your cool code goes here!
 
-  return data;
+    return data
 }
 
-datamosh.MODES.newMode = newMode;
+datamosh.MODES.newMode = newMode
 ```
 
 ## Example Images
@@ -96,4 +96,4 @@ Vaporwave was created by user [@tlaskey](https://github.com/tlaskey)
 
 Check out this list of awesome apps that use `datamosh`!
 
-- [JanMichaelBot](https://github.com/tlaskey/JanMichaelBot) by user [@Tlaskey](https://github.com/tlaskey)
+-   [JanMichaelBot](https://github.com/tlaskey/JanMichaelBot) by user [@Tlaskey](https://github.com/tlaskey)

example.ts

@@ -0,0 +1,9 @@
+import { readFile } from 'fs/promises'
+import datamosh from './lib/datamosh';
+
+const sampleImagePath: string = './tests/fixtures/rgb.png';
+
+(async () => {
+    const src = await readFile(sampleImagePath)
+    const result = await datamosh({ src })
+})();

index.js

@@ -1 +1 @@
-module.exports = require("./lib/mosh");
+module.exports = require('./lib/mosh')

jest.config.json

@@ -0,0 +1,8 @@
+{
+  "bail": 1,
+  "verbose": true,
+  "preset": "ts-jest",
+  "testMatch": [
+    "**/tests/**/*.test.ts"
+  ]
+}

lib/datamosh.js

@@ -0,0 +1,73 @@
+'use strict';
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __generator = (this && this.__generator) || function (thisArg, body) {
+    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
+    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
+    function verb(n) { return function (v) { return step([n, v]); }; }
+    function step(op) {
+        if (f) throw new TypeError("Generator is already executing.");
+        while (g && (g = 0, op[0] && (_ = 0)), _) try {
+            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
+            if (y = 0, t) op = [op[0] & 2, t.value];
+            switch (op[0]) {
+                case 0: case 1: t = op; break;
+                case 4: _.label++; return { value: op[1], done: false };
+                case 5: _.label++; y = op[1]; op = [0]; continue;
+                case 7: op = _.ops.pop(); _.trys.pop(); continue;
+                default:
+                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
+                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
+                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
+                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
+                    if (t[2]) _.ops.pop();
+                    _.trys.pop(); continue;
+            }
+            op = body.call(thisArg, _);
+        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
+        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
+    }
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+var encode = require("image-encode");
+var decode = require("image-decode");
+var file_type_1 = require("file-type");
+var modes_1 = require("./modes");
+function datamosh(_a) {
+    var src = _a.src, _b = _a.mode, mode = _b === void 0 ? 'random' : _b, modes = _a.modes;
+    return __awaiter(this, void 0, void 0, function () {
+        var fileTypeMeta, decodedSourceImg, moshedImg, encodedMoshedImg;
+        return __generator(this, function (_c) {
+            switch (_c.label) {
+                case 0: return [4 /*yield*/, (0, file_type_1.fromBuffer)(src)];
+                case 1:
+                    fileTypeMeta = _c.sent();
+                    if (!fileTypeMeta ||
+                        !['jpg', 'jpeg', 'png', 'gif', 'tif', 'bmp'].includes(fileTypeMeta === null || fileTypeMeta === void 0 ? void 0 : fileTypeMeta.ext))
+                        throwError('Invalid source buffer.');
+                    decodedSourceImg = decode(src);
+                    moshedImg = Buffer.from(decodedSourceImg.data);
+                    if (mode && modes_1.default[mode])
+                        moshedImg = modes_1.default[mode](moshedImg);
+                    if (modes &&
+                        modes.filter(function (m) { return modes_1.default.includes(m); }).length === modes.length) {
+                        modes.forEach(function (mode) { return moshedImg = modes_1.default[mode](moshedImg); });
+                    }
+                    encodedMoshedImg = encode(moshedImg, [decodedSourceImg.width, decodedSourceImg.height], fileTypeMeta.ext);
+                    return [2 /*return*/, encodedMoshedImg];
+            }
+        });
+    });
+}
+function throwError(msg) {
+    var error = new Error(msg);
+    throw error;
+}
+exports.default = datamosh;

lib/datamosh.ts

@@ -0,0 +1,54 @@
+'use strict'
+
+import * as encode from 'image-encode'
+import * as decode from 'image-decode'
+import { fromBuffer } from 'file-type'
+
+import supportedModes from './modes'
+
+type MoshArguments = {
+    src: Buffer
+    mode?: string
+    modes?: Array<string>
+}
+
+async function datamosh({ src, mode = 'random', modes }: MoshArguments) {
+    // validate file-type
+    const fileTypeMeta: any = await fromBuffer(src)
+    if (
+        !fileTypeMeta ||
+        !['jpg', 'jpeg', 'png', 'gif', 'tif', 'bmp'].includes(fileTypeMeta?.ext)
+    )
+        throwError('Invalid source buffer.')
+
+    // decode image
+    const decodedSourceImg: any = decode(src)
+
+    // apply mode(s)
+    let moshedImg = Buffer.from(decodedSourceImg.data)
+    if (mode && supportedModes[mode])
+        moshedImg = supportedModes[mode](moshedImg)
+    if (
+        modes &&
+        modes.filter((m) => supportedModes.includes(m)).length === modes.length
+    ) {
+        modes.forEach(
+            (mode) => moshedImg = supportedModes[mode](moshedImg)
+        )
+    }
+
+    // encode image
+    const encodedMoshedImg = encode(
+        moshedImg,
+        [decodedSourceImg.width, decodedSourceImg.height],
+        fileTypeMeta.ext
+    )
+    return encodedMoshedImg
+}
+
+function throwError(msg: string) {
+    const error: Error = new Error(msg)
+    throw error
+}
+
+export default datamosh