create gen-flow-files and flow:coverage scripts

.flowconfig

@@ -1,4 +1,5 @@
 [ignore]
+<PROJECT_ROOT>/lib/.*
 
 [include]
 ./src

.npmignore

@@ -1,6 +1,7 @@
 coverage
 .nyc_output
 test
+scripts
 node_modules
 .babelrc
 .eslintrc

package.json

@@ -8,10 +8,13 @@
     "lint:fix": "eslint --fix src test",
     "lint:watch": "esw --watch src test",
     "flow": "flow",
+    "flow:coverage": "for file in src/*.js; do echo $file; flow coverage $file; done",
     "flow:watch": "flow-watch --ignore lib/ --ignore node_modules/ --watch .flowconfig --watch src/ --watch scripts/ --watch test/",
+    "gen-flow-files": "babel-node scripts/gen-flow-files.js",
+    "build": "rimraf lib && babel src --out-dir lib",
     "test": "mocha $npm_package_config_mocha",
     "coverage": "NODE_ENV=coverage nyc --reporter=lcov --reporter=text mocha $npm_package_config_mocha",
-    "prepublish": "npm run lint && flow && npm run coverage && rimraf lib && babel src --out-dir lib",
+    "prepublish": "npm run lint && flow && npm run coverage && npm run build && npm run gen-flow-files",
     "postpublish": "git tag -a v$npm_package_version -m v$npm_package_version && git push origin v$npm_package_version"
   },
   "config": {
@@ -53,11 +56,13 @@
     "babel-runtime": "^6.11.6",
     "chai": "^3.5.0",
     "coveralls": "^2.11.14",
+    "es6-promisify": "^5.0.0",
     "eslint": "^3.7.0",
     "eslint-config-andy": "github:jedwards1211/eslint-config-andy#2.0.0-beta7",
     "eslint-watch": "^2.1.14",
     "flow-bin": "^0.33.0",
     "flow-watch": "^1.0.0",
+    "glob": "^7.1.1",
     "istanbul": "^0.4.5",
     "mocha": "^3.1.0",
     "nyc": "^8.3.0",

scripts/asyncScript.js

@@ -0,0 +1,14 @@
+// @flow
+
+async function asyncScript(run: () => Promise<*>, options?: {exitOnSuccess?: boolean} = {}): Promise<any> {
+  try {
+    const result = await run()
+    if (options.exitOnSuccess !== false) process.exit(0)
+    else return result
+  } catch (error) {
+    console.error(error.stack) // eslint-disable-line no-console
+    process.exit(1)
+  }
+}
+
+export default asyncScript

scripts/gen-flow-files.js

@@ -0,0 +1,22 @@
+// @flow
+
+import glob from 'glob'
+import {exec} from 'child_process'
+import path from 'path'
+import fs from 'fs'
+import flow from 'flow-bin'
+import asyncScript from './asyncScript'
+import promisify from 'es6-promisify'
+
+const src = path.resolve(__dirname, '..', 'src')
+const lib = path.resolve(__dirname, '..', 'lib')
+
+asyncScript(async () => {
+  const files = await promisify(glob)(path.join(src, '**', '*.js'))
+  await Promise.all(files.map(async file => {
+    const stdout = await promisify(exec)(`${flow} gen-flow-files ${file}`)
+    const outfile = path.join(lib, path.relative(src, file)) + '.flow'
+    await promisify(fs.writeFile)(outfile, stdout, 'utf8')
+    console.log('wrote', outfile)
+  }))
+})