Promisify by hand for Node 6 compatibility

Author: moonglum

lib/build-bundler.js

@@ -1,9 +1,6 @@
-let fs = require("fs");
 let path = require("path");
 let { createFile, generateFingerprint } = require("faucet-pipeline-util");
-// TODO: Not available on all supported Node versions
-let { promisify } = require("util");
-let readFile = promisify(fs.readFile);
+let { readFile } = require("./promisified-fs");
 let tree = require("./tree");
 
 module.exports = ({ source, target, fingerprint, configDir }) => {

lib/promisified-fs.js

@@ -0,0 +1,34 @@
+let fs = require("fs");
+
+exports.stat = somePath => {
+	return new Promise((resolve, reject) => {
+		fs.stat(somePath, (err, r) => {
+			if(err) {
+				return reject(err);
+			}
+			resolve(r);
+		});
+	});
+};
+
+exports.readdir = (somePath, opts) => {
+	return new Promise((resolve, reject) => {
+		fs.readdir(somePath, opts, (err, r) => {
+			if(err) {
+				return reject(err);
+			}
+			resolve(r);
+		});
+	});
+};
+
+exports.readFile = (somePath, opts) => {
+	return new Promise((resolve, reject) => {
+		fs.readFile(somePath, opts, (err, r) => {
+			if(err) {
+				return reject(err);
+			}
+			resolve(r);
+		});
+	});
+};

lib/tree.js

@@ -1,9 +1,5 @@
-let fs = require("fs");
 let path = require("path");
-// TODO: Not available on all supported Node versions
-let { promisify } = require("util");
-let stat = promisify(fs.stat);
-let readdir = promisify(fs.readdir);
+let { readdir, stat } = require("./promisified-fs");
 
 function tree(directory, relativeTo = directory) {
 	return readdir(directory).then(entries => {