Added sample Flow setup - Discussion for #417

.babelrc

@@ -1,5 +1,5 @@
 {
-	"presets": ["env"],
+	"presets": ["env", "flow"],
 	"plugins": [
 		"transform-runtime",
 		["module-resolver", {

.eslintignore

@@ -3,3 +3,5 @@ dist-*/
 docs/
 browsertest/browsertest.js
 browsertest/browsertest.min.js
+flow-typed/
+flow/

.eslintrc.json

@@ -3,12 +3,17 @@
 	"globals": {
 		"naclInstance": true
 	},
+	"parser": "babel-eslint",
+	"plugins": [
+		"flowtype"
+	],
 	"rules": {
 		"arrow-parens": ["error", "as-needed"],
 		"curly": "off",
 		"indent": "off",
 		"no-confusing-arrow": "off",
 		"no-mixed-operators": "off",
+		"flowtype/define-flow-type": 2,
 		"import/no-extraneous-dependencies": [
 			"error", {
 				"devDependencies": [

.flowconfig

@@ -0,0 +1,14 @@
+[include]
+
+[ignore]
+.*/node_modules/cypress/dist/*
+
+[options]
+module.system.node.resolve_dirname=node_modules
+module.system.node.resolve_dirname=./src
+
+[libs]
+flow/
+
+[version]
+^0.65.0

flow-typed/npm/browserify-bignum_vx.x.x.js

@@ -0,0 +1,32 @@
+// flow-typed signature: 17becd1d346f1153761ee64bc67040bf
+// flow-typed version: <<STUB>>/browserify-bignum_v1.2.0-2/flow_v0.65.0
+
+/**
+ * This is an autogenerated libdef stub for:
+ *
+ *   'browserify-bignum'
+ *
+ * Fill this stub out by replacing all the `any` types.
+ *
+ * Once filled out, we encourage you to share your work with the
+ * community by sending a pull request to:
+ * https://github.com/flowtype/flow-typed
+ */
+
+declare module 'browserify-bignum' {
+  declare module.exports: any;
+}
+
+/**
+ * We include stubs for each file inside this npm package in case you need to
+ * require those files directly. Feel free to delete any files that aren't
+ * needed.
+ */
+declare module 'browserify-bignum/bignumber' {
+  declare module.exports: any;
+}
+
+// Filename aliases
+declare module 'browserify-bignum/bignumber.js' {
+  declare module.exports: $Exports<'browserify-bignum/bignumber'>;
+}

flow-typed/npm/ed2curve_vx.x.x.js

@@ -0,0 +1,39 @@
+// flow-typed signature: 1feaec8cb9a0c548abb19b409471318d
+// flow-typed version: <<STUB>>/ed2curve_v0.2.1/flow_v0.65.0
+
+/**
+ * This is an autogenerated libdef stub for:
+ *
+ *   'ed2curve'
+ *
+ * Fill this stub out by replacing all the `any` types.
+ *
+ * Once filled out, we encourage you to share your work with the
+ * community by sending a pull request to:
+ * https://github.com/flowtype/flow-typed
+ */
+
+declare module 'ed2curve' {
+  declare module.exports: any;
+}
+
+/**
+ * We include stubs for each file inside this npm package in case you need to
+ * require those files directly. Feel free to delete any files that aren't
+ * needed.
+ */
+declare module 'ed2curve/ed2curve' {
+  declare module.exports: any;
+}
+
+declare module 'ed2curve/ed2curve.min' {
+  declare module.exports: any;
+}
+
+// Filename aliases
+declare module 'ed2curve/ed2curve.js' {
+  declare module.exports: $Exports<'ed2curve/ed2curve'>;
+}
+declare module 'ed2curve/ed2curve.min.js' {
+  declare module.exports: $Exports<'ed2curve/ed2curve.min'>;
+}

flow-typed/npm/js-nacl_vx.x.x.js

@@ -0,0 +1,101 @@
+// flow-typed signature: a76fc4797b92c528b2d521ba3753bd43
+// flow-typed version: <<STUB>>/js-nacl_vjs-nacl#6dc1417/flow_v0.65.0
+
+/**
+ * This is an autogenerated libdef stub for:
+ *
+ *   'js-nacl'
+ *
+ * Fill this stub out by replacing all the `any` types.
+ *
+ * Once filled out, we encourage you to share your work with the
+ * community by sending a pull request to:
+ * https://github.com/flowtype/flow-typed
+ */
+
+declare type NaclKeyPair = {
+	signPk: Uint8Array,
+	signSk: Uint8Array,
+};
+
+declare export class NaclInstance {
+	to_hex: (Uint8Array) => string,
+	from_hex: (string) => Uint8Array,
+	encode_utf8: (string) => Uint8Array,
+	encode_latin1: (string) => Uint8Array,
+	decode_utf8: (Uint8Array) => string,
+	crypto_box: (
+		ciphertextBin: Uint8Array,
+		nonceBin: Uint8Array,
+		senderPublicKeyBin: Uint8Array,
+		recipientSecretKeyBin: Uint8Array,
+	) => Uint8Array,
+	crypto_box_open: (ciphertextBin: Uint8Array,
+		nonceBin: Uint8Array,
+		senderPublicKeyBin: Uint8Array,
+		recipientSecretKeyBin: Uint8Array,
+	) => Uint8Array,
+	crypto_box_random_nonce: () => Uint8Array,
+	crypto_hash_sha256: (Uint8Array) => Uint8Array,
+	crypto_sign_seed_keypair: (Uint8Array) => NaclKeyPair,
+	crypto_sign_detached: (msgBin: Uint8Array, signerSecretKey: Uint8Array) => Uint8Array,
+	crypto_sign_BYTES: number,
+	crypto_sign_verify_detached:
+		(detachedSignatureBin: Uint8Array, msgBin: Uint8Array, signerPublicKey: Uint8Array)
+			=> boolean,
+}
+
+declare module 'js-nacl' {
+	declare module.exports: {
+		instantiate((nacl: NaclInstance) => void): void,
+	};
+}
+
+/**
+ * We include stubs for each file inside this npm package in case you need to
+ * require those files directly. Feel free to delete any files that aren't
+ * needed.
+ */
+declare module 'js-nacl/benchmark' {
+  declare module.exports: any;
+}
+
+declare module 'js-nacl/lib/nacl_factory' {
+  declare module.exports: any;
+}
+
+declare module 'js-nacl/nacl_cooked_prefix' {
+  declare module.exports: any;
+}
+
+declare module 'js-nacl/nacl_cooked_suffix' {
+  declare module.exports: any;
+}
+
+declare module 'js-nacl/nacl_cooked' {
+  declare module.exports: any;
+}
+
+declare module 'js-nacl/test/tests' {
+  declare module.exports: any;
+}
+
+// Filename aliases
+declare module 'js-nacl/benchmark.js' {
+  declare module.exports: $Exports<'js-nacl/benchmark'>;
+}
+declare module 'js-nacl/lib/nacl_factory.js' {
+  declare module.exports: $Exports<'js-nacl/lib/nacl_factory'>;
+}
+declare module 'js-nacl/nacl_cooked_prefix.js' {
+  declare module.exports: $Exports<'js-nacl/nacl_cooked_prefix'>;
+}
+declare module 'js-nacl/nacl_cooked_suffix.js' {
+  declare module.exports: $Exports<'js-nacl/nacl_cooked_suffix'>;
+}
+declare module 'js-nacl/nacl_cooked.js' {
+  declare module.exports: $Exports<'js-nacl/nacl_cooked'>;
+}
+declare module 'js-nacl/test/tests.js' {
+  declare module.exports: $Exports<'js-nacl/test/tests'>;
+}

flow/types.js

@@ -0,0 +1,43 @@
+/*
+ * Copyright © 2017 Lisk Foundation
+ *
+ * See the LICENSE file at the top-level directory of this distribution
+ * for licensing information.
+ *
+ * Unless otherwise agreed in a custom licensing agreement with the Lisk Foundation,
+ * no part of this software, including this file, may be copied, modified,
+ * propagated, or distributed except according to the terms contained in the
+ * LICENSE file.
+ *
+ * Removal or modification of this copyright notice is prohibited.
+ *
+ * @flow
+ */
+
+declare type Options = {
+	ssl: boolean,
+	node: string,
+	randomPeer: boolean,
+	testnet: boolean,
+	port: string,
+	bannedPeers: Array<string>,
+	nethash: NethashOption,
+};
+
+declare type NethashOption = {
+	'Content-Type': string,
+	nethash: string,
+	broadhash: string,
+	os: string,
+	version: string,
+	minVersion: string,
+	port: string,
+	Accept: string,
+};
+
+declare type NethashOptions = {
+	mainnet: NethashOption,
+	testnet: NethashOption,
+};
+
+declare var naclInstance: NaclInstance;