Modernize code a bit

.travis.yml

@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - '6'
-  - '4'
-  - '0.12'
-  - '0.10'
+  - '12'
+  - '14'
+  - '16'

appveyor.yml

@@ -3,10 +3,9 @@
 # Test against these versions of Node.js.
 environment:
   matrix:
-    - nodejs_version: '6'
-    - nodejs_version: '4'
-    - nodejs_version: '0.12'
-    - nodejs_version: '0.10'
+    - nodejs_version: '12'
+    - nodejs_version: '14'
+    - nodejs_version: '16'
 
 # Install scripts. (runs after repo cloning)
 install:

index.js

@@ -15,7 +15,7 @@
  * responsible for uncompressing in that case if necessary).
  */
 
-exports.Reader = require('./lib/reader');
+exports.Reader = require('./lib/reader.js');
 
 /**
  * The `Writer` class outputs a valid WAVE file from the audio data written to
@@ -26,12 +26,12 @@ exports.Reader = require('./lib/reader');
  * written.
  */
 
-exports.Writer = require('./lib/writer');
+exports.Writer = require('./lib/writer.js');
 
 /**
  * The `FileWriter` is a subclass of `Writer` that automatically takes care of
  * writing the "header" event at the end of the stream to the beginning of the
  * output file.
  */
 
-exports.FileWriter = require('./lib/file-writer');
+exports.FileWriter = require('./lib/file-writer.js');

lib/file-writer.js

@@ -4,14 +4,7 @@
  */
 
 var fs = require('fs');
-var Writer = require('./writer');
-var inherits = require('util').inherits;
-
-/**
- * Module exports.
- */
-
-module.exports = FileWriter;
+var Writer = require('./writer.js');
 
 /**
  * The `FileWriter` class.
@@ -21,45 +14,54 @@ module.exports = FileWriter;
  * @api public
  */
 
-function FileWriter (path, opts) {
-  if (!(this instanceof FileWriter)) return new FileWriter(path, opts);
-  Writer.call(this, opts);
-  this.path = path;
-  this.file = fs.createWriteStream(path, opts);
-  this.pipe(this.file);
-  this.on('header', this._onHeader);
-}
-inherits(FileWriter, Writer);
+class FileWriter extends Writer {
+  constructor (path, opts) {
+    super(opts);
+    this.path = path;
+    this.file = fs.createWriteStream(path, opts);
+    this.pipe(this.file);
+    this.on('header', this._onHeader);
+  }
 
-/**
- * Writes the updated WAVE header to the beginning of the file.
- * Emits a "done" event when everything is all good.
- *
- * @api private
- */
+  /**
+   * Writes the updated WAVE header to the beginning of the file.
+   * Emits a "done" event when everything is all good.
+   *
+   * @api private
+   */
+  _onHeader(header) {
+    var self = this;
+    var fd;
 
-FileWriter.prototype._onHeader = function (header) {
-  var self = this;
-  var fd;
+    function onOpen(err, f) {
+      if (err)
+        return self.emit('error', err);
+      fd = f;
+      fs.write(fd, header, 0, header.length, 0, onWrite);
+    }
 
-  function onOpen (err, f) {
-    if (err) return self.emit('error', err);
-    fd = f;
-    fs.write(fd, header, 0, header.length, 0, onWrite);
-  }
+    function onWrite(err, bytesWritten) {
+      if (err)
+        return self.emit('error', err);
+      if (bytesWritten !== header.length) {
+        return self.emit('error', new Error('problem writing "header" data'));
+      }
+      fs.close(fd, onClose);
+    }
 
-  function onWrite (err, bytesWritten) {
-    if (err) return self.emit('error', err);
-    if (bytesWritten !== header.length) {
-      return self.emit('error', new Error('problem writing "header" data'));
+    function onClose(err) {
+      if (err)
+        return self.emit('error', err);
+      self.emit('done');
     }
-    fs.close(fd, onClose);
-  }
 
-  function onClose (err) {
-    if (err) return self.emit('error', err);
-    self.emit('done');
+    fs.open(self.path, 'r+', onOpen);
   }
+}
+
+
+/**
+ * Module exports.
+ */
 
-  fs.open(self.path, 'r+', onOpen);
-};
+module.exports = FileWriter;