Add version to build and the archived asar app (#854)

package-lock.json

       "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
       "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
     },
+    "asar": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/asar/-/asar-2.1.0.tgz",
+      "integrity": "sha512-d2Ovma+bfqNpvBzY/KU8oPY67ZworixTpkjSx0PCXnQi67c2cXmssaTxpFDUM0ttopXoGx/KRxNg/GDThYbXQA==",
+      "dev": true,
+      "requires": {
+        "@types/glob": "^7.1.1",
+        "chromium-pickle-js": "^0.2.0",
+        "commander": "^2.20.0",
+        "cuint": "^0.2.2",
+        "glob": "^7.1.3",
+        "minimatch": "^3.0.4",
+        "mkdirp": "^0.5.1",
+        "tmp-promise": "^1.0.5"
+      }
+    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
         "tslib": "^1.9.0"
       }
     },
+    "chromium-pickle-js": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/chromium-pickle-js/-/chromium-pickle-js-0.2.0.tgz",
+      "integrity": "sha1-BKEGZywYsIWrd02YPfo+oTjyIgU=",
+      "dev": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
       "integrity": "sha512-xz39Sb4+OaTsULgUERcCk+TJj8ylkL4aSVDQiX/ksxbELSqwkgt4d4RD7fovIdgJGSuNYqwZEiVjYY5l0ask+Q==",
       "dev": true
     },
+    "cuint": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/cuint/-/cuint-0.2.2.tgz",
+      "integrity": "sha1-QICG1AlVDCYxFVYZ6fp7ytw7mRs=",
+      "dev": true
+    },
     "currently-unhandled": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/currently-unhandled/-/currently-unhandled-0.4.1.tgz",
         "os-tmpdir": "~1.0.2"
       }
     },
+    "tmp-promise": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/tmp-promise/-/tmp-promise-1.1.0.tgz",
+      "integrity": "sha512-8+Ah9aB1IRXCnIOxXZ0uFozV1nMU5xiu7hhFVUSxZ3bYu+psD4TzagCzVbexUCgNNGJnsmNDQlS4nG3mTyoNkw==",
+      "dev": true,
+      "requires": {
+        "bluebird": "^3.5.0",
+        "tmp": "0.1.0"
+      },
+      "dependencies": {
+        "tmp": {
+          "version": "0.1.0",
+          "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.1.0.tgz",
+          "integrity": "sha512-J7Z2K08jbGcdA1kkQpJSqLF6T0tdQqpR2pnSUXsIchbPdTI9v3e85cLW0d6WDhwuAleOV71j2xWs8qMPfK7nKw==",
+          "dev": true,
+          "requires": {
+            "rimraf": "^2.6.3"
+          }
+        }
+      }
+    },
     "tmpl": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",

package.json

     "roughjs": "4.0.4",
     "stacktrace-js": "2.0.2"
   },
-  "description": "",
   "devDependencies": {
+    "asar": "2.1.0",
     "@testing-library/jest-dom": "5.1.1",
     "@testing-library/react": "9.4.1",
     "@types/jest": "25.1.3",
   "main": "src/index.js",
   "name": "excalidraw",
   "scripts": {
-    "build": "react-scripts build",
-    "build-node": "./scripts/build-node.js",
+    "build:app": "react-scripts build",
+    "build:zip": "node ./scripts/build-version.js",
+    "build": "npm run build:app && npm run build:zip",
+    "build-node": "node ./scripts/build-node.js",
     "eject": "react-scripts eject",
     "fix": "npm run fix:other && npm run fix:code",
     "fix:code": "npm run test:code -- --fix",

scripts/build-version.js

+#!/usr/bin/env node
+
+const fs = require("fs");
+const path = require("path");
+const asar = require("asar");
+
+const zero = digit => `0${digit}`.slice(-2);
+
+const versionDate = date => {
+  const date_ = `${date.getFullYear()}-${zero(date.getMonth() + 1)}-${zero(
+    date.getDate(),
+  )}`;
+  const time = `${zero(date.getHours())}-${zero(date.getMinutes())}-${zero(
+    date.getSeconds(),
+  )}`;
+  return `${date_}-${time}`;
+};
+
+const now = new Date();
+
+const data = JSON.stringify(
+  {
+    app: `excalidraw-${versionDate(now)}.asar`,
+    version: versionDate(now),
+  },
+  undefined,
+  2,
+);
+
+fs.writeFileSync(path.join("build", "version.json"), data);
+
+(async () => {
+  const src = "build/";
+  const dest = path.join("build", `excalidraw-${versionDate(now)}.asar`);
+
+  await asar.createPackage(src, dest);
+})();