first

.eslintrc

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+{
+  "extends": ["prettier", "eslint:recommended"]
+}

.gitignore

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+index.js
+node_modules/
+output/
+temp/

index.ts

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+import renderLottie from "puppeteer-lottie";
+import * as fs from "fs/promises";
+import { spawn } from "node:child_process";
+
+const API_URL = "https://discord.com/api/v9/sticker-packs";
+const STICKER_SIZE = 160;
+
+const LOTTIE_BASE_URL = "https://discord.com/stickers/{id}.json";
+const PNG_BASE_URL = "https://media.discordapp.net/stickers/{id}.png";
+
+interface StickerPacks {
+  sticker_packs: StickerPack[];
+}
+
+interface StickerPack {
+  id: string;
+  stickers: Sticker[];
+  name: string;
+  sku_id: string;
+  cover_sticker_id: string;
+  description: string;
+  banner_asset_id?: string;
+}
+
+interface Sticker {
+  id: string;
+  name: string;
+  tags: string;
+  type: number;
+  format_type: StickerFormat;
+  description: string;
+  asset: string;
+  pack_id: string;
+  sort_value: number;
+}
+
+enum StickerFormat {
+  STATIC = 1,
+  APNG = 2,
+  LOTTIE = 3,
+}
+
+async function findFilesWithPrefix(prefix: string, path: string): Promise<string[]> {
+  const files = await fs.readdir(path);
+  const filteredFiles = files.filter((file) => file.startsWith(prefix));
+  return filteredFiles;
+}
+
+const stickerPacks: StickerPacks = await (await fetch(API_URL)).json();
+
+await fs.mkdir("output");
+await fs.mkdir("temp");
+
+for (const pack of stickerPacks.sticker_packs) {
+  for (const sticker of pack.stickers) {
+    switch (sticker.format_type) {
+      case StickerFormat.STATIC:
+        {
+          const stickerFile = await (
+            await fetch(PNG_BASE_URL.replace("{id}", sticker.id))
+          ).blob();
+          await fs.writeFile(
+            `output/${sticker.id}.png`,
+            Buffer.from(await stickerFile.arrayBuffer())
+          );
+        }
+        break;
+
+      case StickerFormat.APNG:
+        {
+          const stickerFile = await (
+            await fetch(PNG_BASE_URL.replace("{id}", sticker.id))
+          ).blob();
+          await fs.writeFile(
+            `temp/${sticker.id}.apng`,
+            Buffer.from(await stickerFile.arrayBuffer())
+          );
+
+          const ffmpeg = spawn("ffmpeg", [
+            "-v",
+            "error",
+            "-i",
+            `temp/${sticker.id}.apng`,
+            `temp/${sticker.id}-%8d.png`,
+          ]);
+          ffmpeg.stdout.on("data", (data) => {
+            console.log(`stdout: ${data}`);
+          });
+          ffmpeg.stderr.on("data", (data) => {
+            console.error(`stderr: ${data}`);
+          });
+          await new Promise((resolve) => ffmpeg.on("exit", resolve));
+
+          let framerate = "";
+
+          const ffprobe = spawn("ffprobe", [
+            "-v",
+            "error",
+            "-select_streams",
+            "v",
+            "-of",
+            "default=noprint_wrappers=1:nokey=1",
+            "-show_entries",
+            "stream=r_frame_rate",
+            `temp/${sticker.id}.apng`
+          ]);
+          ffprobe.stdout.on("data", (data) => {
+            console.log(`stdout: ${data}`);
+            framerate += data;
+          });
+          ffprobe.stderr.on("data", (data) => {
+            console.error(`stderr: ${data}`);
+          });
+          await new Promise((resolve) => ffprobe.on("exit", resolve));
+
+          framerate = eval(framerate);
+
+          const gifski = spawn("gifski", [
+            "-o",
+            `output/${sticker.id}.gif`,
+            "--fps",
+            framerate,
+            ...(await findFilesWithPrefix(`${sticker.id}-`, "temp")).map(e => "temp/" + e)
+          ]);
+          gifski.stdout.on("data", (data) => {
+            console.log(`stdout: ${data}`);
+          });
+          gifski.stderr.on("data", (data) => {
+            console.error(`stderr: ${data}`);
+          });
+          await new Promise((resolve) => gifski.on("exit", resolve));
+        }
+        break;
+
+      case StickerFormat.LOTTIE:
+        {
+          const stickerFile = await (
+            await fetch(LOTTIE_BASE_URL.replace("{id}", sticker.id))
+          ).json();
+          await renderLottie({
+            animationData: stickerFile,
+            output: `output/${sticker.id}.gif`,
+            width: STICKER_SIZE,
+            height: STICKER_SIZE,
+          });
+        }
+        break;
+    }
+  }
+}
+
+await fs.rm("temp", { recursive: true });

package.json

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+{
+  "name": "discord-sticker-conv",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "CC0",
+  "private": true,
+  "type": "module",
+  "devDependencies": {
+    "@types/puppeteer-lottie": "^1.1.2",
+    "eslint": "^8.35.0",
+    "eslint-config-prettier": "^8.7.0",
+    "prettier": "^2.8.4",
+    "typescript": "^4.9.5"
+  },
+  "scripts": {
+    "format": "prettier --write .",
+    "lint": "prettier --check . && eslint .",
+    "start": "tsc && node index.js"
+  },
+  "dependencies": {
+    "puppeteer-lottie": "^1.1.2"
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig to read more about this file */
+
+    /* Projects */
+    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
+    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
+    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
+    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+
+    /* Language and Environment */
+    "target": "ES2017" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
+    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
+    // "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */
+    // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
+    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
+    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
+    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
+
+    /* Modules */
+    "module": "ES2022" /* Specify what module code is generated. */,
+    // "rootDir": "./",                                  /* Specify the root folder within your source files. */
+    "moduleResolution": "node" /* Specify how TypeScript looks up a file from a given module specifier. */,
+    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
+    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
+    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
+    // "resolveJsonModule": true,                        /* Enable importing .json files. */
+    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
+
+    /* JavaScript Support */
+    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
+    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
+
+    /* Emit */
+    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
+    // "outDir": "./",                                   /* Specify an output folder for all emitted files. */
+    // "removeComments": true,                           /* Disable emitting comments. */
+    // "noEmit": true,                                   /* Disable emitting files from a compilation. */
+    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+    // "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types. */
+    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
+    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
+    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
+    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
+    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+    // "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
+
+    /* Interop Constraints */
+    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
+    "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,
+    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+    "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
+
+    /* Type Checking */
+    "strict": true /* Enable all strict type-checking options. */,
+    // "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,                         /* When type checking, take into account 'null' and 'undefined'. */
+    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
+    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
+    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
+    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
+    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
+    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
+    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
+    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+
+    /* Completeness */
+    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+    "skipLibCheck": true /* Skip type checking all .d.ts files. */
+  }
+}