use graceful-fs to avoid EMFILE for large projects

lib/get-files.js

@@ -1,4 +1,5 @@
-import fs, { readFile as read } from 'fs-promise';
+import { stat } from 'fs-promise';
+import { readdir, readFile } from './graceful-fs';
 import { resolve } from 'path';
 import flatten from 'arr-flatten';
 import unique from 'array-unique';
@@ -16,7 +17,8 @@ import IGNORED from './ignored';
 
 export default async function getFiles (path, pkg) {
   if (!pkg) {
-    const pkgData = await read(resolve(path, 'package.json'), 'utf8');
+    const pkgPath = resolve(path, 'package.json');
+    const pkgData = await readFile(pkgPath, 'utf8');
     pkg = JSON.parse(pkgData);
   }
 
@@ -103,19 +105,19 @@ const explode = async function (paths) {
 
   const list = async (file) => {
     let path = file;
-    let stat;
+    let s;
 
     try {
-      stat = await fs.stat(path);
+      s = await stat(path);
     } catch (e) {
       // in case the file comes from `files` or `main`
       // and it wasn't specified with `.js` by the user
       path = file + '.js';
-      stat = await fs.stat(path);
+      s = await stat(path);
     }
 
-    if (stat.isDirectory()) {
-      const all = await fs.readdir(file);
+    if (s.isDirectory()) {
+      const all = await readdir(file);
       return many(all.map(subdir => asAbsolute(subdir, file)));
     } else {
       return path;
@@ -133,7 +135,7 @@ const explode = async function (paths) {
 
 const maybeRead = async function (path) {
   try {
-    return (await fs.readFile(path, 'utf8'));
+    return (await readFile(path, 'utf8'));
   } catch (e) {
     return '';
   }

lib/graceful-fs.js

@@ -0,0 +1,5 @@
+import fs from 'graceful-fs';
+import promisify from 'es6-promisify';
+
+export const readdir = promisify(fs.readdir);
+export const readdir = promisify(fs.);

lib/hash.js

@@ -1,4 +1,4 @@
-import fs from 'fs-promise';
+import { readFile } from './graceful-fs';
 import { createHash } from 'crypto';
 
 /**
@@ -10,7 +10,7 @@ import { createHash } from 'crypto';
 
 export default async function hashes (files) {
   const entries = await Promise.all(files.map(async (file) => {
-    const data = await fs.readFile(file);
+    const data = await readFile(file);
     return [hash(data), file];
   }));
   return new Map(entries);

package.json

@@ -19,7 +19,9 @@
     "chalk": "1.1.1",
     "commander": "2.9.0",
     "copy-paste": "1.1.4",
+    "es6-promisify": "3.0.0",
     "fs-promise": "0.4.1",
+    "graceful-fs": "4.1.3",
     "ms": "0.7.1",
     "node-fetch": "1.3.3",
     "spdy": "3.2.0"