initial commit

.babelrc

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+{
+  "presets": ["@babel/preset-env"],
+  "plugins": ["@babel/transform-flow-strip-types"],
+  "ignore": ["**/*.test.js"]
+}

.flowconfig

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+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+
+[options]
+
+[strict]

.gitignore

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+node_modules

README.md

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+# Flow Filter Nulls
+
+A little util for filtering nulls from an array in a typesafe way using flow.
+
+This exists mostly for me to learn about setting up and deploying library packages on npm.

lib/index.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = filterNulls;
+
+function filterNulls(array) {
+  return array.filter(function (item) {
+    return item != null;
+  }).filter(Boolean);
+}

lib/index.js.flow

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+// @flow strict
+
+export default function filterNulls<T>(array: Array<?T>): Array<T> {
+  return array.filter((item) => item != null).filter(Boolean);
+}

package.json

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+{
+  "name": "flow-filter-null",
+  "version": "1.0.0",
+  "description": "Flow typed filtering of nulls from arrays",
+  "main": "lib/index.js",
+  "author": "Joe Hart <[email protected]>",
+  "license": "MIT",
+  "scripts": {
+    "prepack": "npm run prepack:babel && npm run prepack:flow",
+    "prepack:babel": "babel src/ -d lib",
+    "prepack:flow": "flow-copy-source src lib"
+  },
+  "files": [
+    "lib"
+  ],
+  "devDependencies": {
+    "@babel/cli": "^7.10.1",
+    "@babel/core": "^7.10.2",
+    "@babel/plugin-transform-flow-strip-types": "^7.10.1",
+    "@babel/preset-env": "^7.10.2",
+    "babel-preset-es2015": "^6.24.1",
+    "flow-bin": "^0.127.0",
+    "flow-copy-source": "^2.0.9"
+  }
+}

src/index.js

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+// @flow strict
+
+export default function filterNulls<T>(array: Array<?T>): Array<T> {
+  return array.filter((item) => item != null).filter(Boolean);
+}