App written

.babelrc

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+{
+  "presets":["flow", "env"]
+}

.npmignore

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+src
+README.md

README.md

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+# Formal
+<q>being in accordance with the usual requirements, customs, etc</q>

flow-typed/jack.js

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+declare function preventSubmission(submission: Event, callback?: () => void): void;

lib/jack.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.preventSubmission = preventSubmission;
+function preventSubmission(submission, callback) {
+  submission.preventDefault();
+  if (callback) {
+    callback();
+  } else {
+    return;
+  }
+}

lib/jack.js.flow

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+// @flow
+
+export function preventSubmission(submission: Event, callback?: () => void): void {
+  submission.preventDefault();
+  if (callback) {
+    callback();
+  } else {
+    return;
+  }
+}

package.json

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+{
+  "name": "customary",
+  "version": "1.0.0",
+  "description": "Prevents form submission after native validation has taken place.",
+  "main": "lib/jack.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "flow": "flow",
+    "build:transpile": "babel src --out-dir lib",
+    "build:type": "flow-copy-source -v src lib",
+    "build": "npm run build:transpile && npm run build:type",
+    "prepublish": "npm run build"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/DanArthurGallagher/formal.git"
+  },
+  "keywords": [
+    "front-end"
+  ],
+  "author": "Daniel Arthur Gallagher",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/DanArthurGallagher/formal/issues"
+  },
+  "homepage": "https://github.com/DanArthurGallagher/formal#readme",
+  "devDependencies": {
+    "babel-cli": "^6.24.1",
+    "babel-preset-env": "^1.4.0",
+    "babel-preset-flow": "^6.23.0",
+    "flow-bin": "^0.45.0",
+    "flow-copy-source": "^1.1.0"
+  },
+  "browserslist": [
+    "last 2 Chrome versions",
+    "last 2 Firefox versions",
+    "last 1 Safari version",
+    "last 1 iOS version",
+    "last 1 Samsung version",
+    "last 1 Edge version"
+  ]
+}

src/jack.js

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+// @flow
+
+export function preventSubmission(submission: Event, callback?: () => void): void {
+  submission.preventDefault();
+  if (callback) {
+    callback();
+  } else {
+    return;
+  }
+}