Replace write with combination of mkdir and writeFile (#49)

Node v10 introduced a great "recursive" option for mkdir which allows to
get rid from mkdirp package and easily rewrite "write" package usage
with two function calls.

https://nodejs.org/api/fs.html#fs_fs_mkdir_path_options_callback

.travis.yml

@@ -1,7 +1,5 @@
  language: node_js
  node_js:
-    - "6"
-    - "8"
-    - "9"
     - "10"
-    - "11"
+    - "12"
+    - "14"

package.json

@@ -15,7 +15,7 @@
     "del.js"
   ],
   "engines": {
-    "node": ">=4"
+    "node": ">=10.12.0"
   },
   "precommit": [
     "npm run verify --silent"
@@ -81,7 +81,6 @@
   },
   "dependencies": {
     "flatted": "^2.0.0",
-    "rimraf": "^2.6.3",
-    "write": "^1.0.3"
+    "rimraf": "^2.6.3"
   }
 }

test/specs/cache.js

@@ -6,7 +6,6 @@ describe( 'flat-cache', function () {
   var rimraf = require( 'rimraf' ).sync;
   var fs = require( 'fs' );
   var flatCache = require( '../../cache' );
-  var write = require( 'write' );
 
   beforeEach( function () {
     flatCache.clearAll();
@@ -22,7 +21,10 @@ describe( 'flat-cache', function () {
 
   it( 'should not crash if the cache file exists but it is an empty string', function () {
     var cachePath = path.resolve( __dirname, '../fixtures/.cache2' );
-    write.sync( path.join( cachePath, 'someId' ), '' );
+    fs.mkdirSync( cachePath, {
+      recursive: true
+    } );
+    fs.writeFileSync( path.join( cachePath, 'someId' ), '' );
 
     expect( function () {
       var cache = flatCache.load( 'someId', cachePath );
@@ -32,7 +34,10 @@ describe( 'flat-cache', function () {
 
   it( 'should not crash if the cache file exists but it is an invalid JSON string', function () {
     var cachePath = path.resolve( __dirname, '../fixtures/.cache2' );
-    write.sync( path.join( cachePath, 'someId' ), '{ "foo": "fookey", "bar" ' );
+    fs.mkdirSync( cachePath, {
+      recursive: true
+    } );
+    fs.writeFileSync( path.join( cachePath, 'someId' ), '{ "foo": "fookey", "bar" ' );
 
     expect( function () {
       var cache = flatCache.load( 'someId', cachePath );

utils.js

@@ -1,5 +1,5 @@
 var fs = require( 'fs' );
-var write = require( 'write' );
+var path = require( 'path' );
 var flatted = require( 'flatted' );
 
 module.exports = {
@@ -34,6 +34,9 @@ module.exports = {
    * @param  {*} data Object to serialize
    */
   writeJSON: function ( filePath, data ) {
-    write.sync( filePath, flatted.stringify( data ) );
+    fs.mkdirSync( path.dirname( filePath ), {
+      recursive: true
+    } );
+    fs.writeFileSync( filePath, flatted.stringify( data ) );
   }
 };