feat: add flow type annotations

Also configure build/test/lint scripts for Flow typed JS

 - Run flow check after linting
 - Use AEgir config to use babel-loader for webpack builds
 - Use different babel config for browser builds to avoid inlining source maps

Author: Gozala

.aegir.js

@@ -0,0 +1,17 @@
+'use strict'
+
+module.exports = {
+  // Have not used webpack so just copied proposed setup from
+  // https://babeljs.io/docs/setup/#installation
+  webpack: {
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          exclude: /node_modules/,
+          loader: 'babel-loader'
+        }
+      ]
+    }
+  }
+}

.babelrc

@@ -0,0 +1,34 @@
+{
+  "env": {
+    "development": {
+      "sourceMaps": "inline",
+      "comments": false,
+      "presets": [
+        [
+          "env",
+          {
+            "targets": {
+              "node": "current"
+            }
+          }
+        ],
+        "flow-node"
+      ]
+    },
+    "umd": {
+      "comments": false,
+      "presets": [
+        [
+          "env",
+          {
+            "modules": false,
+            "targets": {
+              "browsers": "last 2 versions"
+            }
+          }
+        ],
+        "flow-node"
+      ]
+    }
+  }
+}

.flowconfig

@@ -0,0 +1,9 @@
+[ignore]
+.*/node_modules/documentation/*
+
+[libs]
+
+[include]
+
+[options]
+suppress_comment= \\(.\\|\n\\)*\\@FlowIgnore

.gitignore

@@ -35,3 +35,4 @@ node_modules
 
 dist
 docs
+lib

appveyor.yml

@@ -24,6 +24,7 @@ install:
   - npm install
 
 test_script:
+  - npm run build:node
   - npm run test:node
 
 build: off

package.json

@@ -2,19 +2,24 @@
   "name": "multihashes",
   "version": "0.4.13",
   "description": "multihash implementation",
-  "main": "src/index.js",
+  "main": "lib/index.js",
   "scripts": {
-    "lint": "aegir lint",
-    "test:browser": "aegir test --target browser",
-    "test:node": "aegir test --target node",
-    "build": "aegir build",
-    "test": "aegir test",
+    "lint": "aegir lint && npm run type-check",
+    "test:browser": "npm run build && aegir test --target browser",
+    "test:node": "npm run build:node && aegir test --target node",
+    "type-check": "flow check",
+    "build": "npm run build:node && BABEL_ENV=umd aegir build",
+    "test": "npm run build:node && aegir test",
     "docs": "aegir docs",
     "release": "aegir release --docs",
     "release-minor": "aegir release --type minor --docs",
     "release-major": "aegir release --type major --docs",
     "coverage": "aegir coverage",
-    "coverage-publish": "aegir coverage --provider coveralls"
+    "coverage-publish": "aegir coverage --provider coveralls",
+    "build:types": "flow-copy-source --verbose src lib",
+    "build:lib": "babel --out-dir lib src",
+    "build:node": "npm run build:types && npm run build:lib",
+    "start": "flow-copy-source --watch --verbose src lib & babel --watch --out-dir lib src"
   },
   "pre-commit": [
     "lint",
@@ -42,10 +47,16 @@
     "varint": "^5.0.0"
   },
   "devDependencies": {
-    "aegir": "^12.3.0",
+    "aegir": "git+https://github.com/ipfs/aegir#flow",
+    "babel-cli": "6.26.0",
+    "babel-core": "6.26.0",
+    "babel-loader": "7.1.2",
+    "babel-preset-flow-node": "2.0.1",
     "buffer-equal": "1.0.0",
     "chai": "^4.1.2",
     "dirty-chai": "^2.0.1",
+    "flow-bin": "^0.66.0",
+    "flow-copy-source": "^1.2.0",
     "pre-commit": "^1.2.2"
   },
   "contributors": [