diff --git a/src/git-repository-provider.coffee b/src/git-repository-provider.coffee
deleted file mode 100644
index 593324d0c..000000000
--- a/src/git-repository-provider.coffee
+++ /dev/null
@@ -1,84 +0,0 @@
-fs = require 'fs'
-{Directory} = require 'pathwatcher'
-GitRepository = require './git-repository'
-
-# Returns the .gitdir path in the agnostic Git symlink .git file given, or
-# null if the path is not a valid gitfile.
-#
-# * `gitFile` {String} path of gitfile to parse
-gitFileRegex = RegExp "^gitdir: (.+)"
-pathFromGitFile = (gitFile) ->
-  try
-    gitFileBuff = fs.readFileSync(gitFile, 'utf8')
-    return gitFileBuff?.match(gitFileRegex)[1]
-
-# Checks whether a valid `.git` directory is contained within the given
-# directory or one of its ancestors. If so, a Directory that corresponds to the
-# `.git` folder will be returned. Otherwise, returns `null`.
-#
-# * `directory` {Directory} to explore whether it is part of a Git repository.
-findGitDirectorySync = (directory) ->
-  # TODO: Fix node-pathwatcher/src/directory.coffee so the following methods
-  # can return cached values rather than always returning new objects:
-  # getParent(), getFile(), getSubdirectory().
-  gitDir = directory.getSubdirectory('.git')
-  gitDirPath = pathFromGitFile(gitDir.getPath?())
-  if gitDirPath
-    gitDir = new Directory(directory.resolve(gitDirPath))
-  if gitDir.existsSync?() and isValidGitDirectorySync gitDir
-    gitDir
-  else if directory.isRoot()
-    return null
-  else
-    findGitDirectorySync directory.getParent()
-
-# Returns a boolean indicating whether the specified directory represents a Git
-# repository.
-#
-# * `directory` {Directory} whose base name is `.git`.
-isValidGitDirectorySync = (directory) ->
-  # To decide whether a directory has a valid .git folder, we use
-  # the heuristic adopted by the valid_repository_path() function defined in
-  # node_modules/git-utils/deps/libgit2/src/repository.c.
-  return directory.getSubdirectory('objects').existsSync() and
-      directory.getFile('HEAD').existsSync() and
-      directory.getSubdirectory('refs').existsSync()
-
-# Provider that conforms to the atom.repository-provider@0.1.0 service.
-module.exports =
-class GitRepositoryProvider
-
-  constructor: (@project, @config) ->
-    # Keys are real paths that end in `.git`.
-    # Values are the corresponding GitRepository objects.
-    @pathToRepository = {}
-
-  # Returns a {Promise} that resolves with either:
-  # * {GitRepository} if the given directory has a Git repository.
-  # * `null` if the given directory does not have a Git repository.
-  repositoryForDirectory: (directory) ->
-    # TODO: Currently, this method is designed to be async, but it relies on a
-    # synchronous API. It should be rewritten to be truly async.
-    Promise.resolve(@repositoryForDirectorySync(directory))
-
-  # Returns either:
-  # * {GitRepository} if the given directory has a Git repository.
-  # * `null` if the given directory does not have a Git repository.
-  repositoryForDirectorySync: (directory) ->
-    # Only one GitRepository should be created for each .git folder. Therefore,
-    # we must check directory and its parent directories to find the nearest
-    # .git folder.
-    gitDir = findGitDirectorySync(directory)
-    unless gitDir
-      return null
-
-    gitDirPath = gitDir.getPath()
-    repo = @pathToRepository[gitDirPath]
-    unless repo
-      repo = GitRepository.open(gitDirPath, {@project, @config})
-      return null unless repo
-      repo.onDidDestroy(=> delete @pathToRepository[gitDirPath])
-      @pathToRepository[gitDirPath] = repo
-      repo.refreshIndex()
-      repo.refreshStatus()
-    repo
diff --git a/src/git-repository-provider.js b/src/git-repository-provider.js
new file mode 100644
index 000000000..096e70c73
--- /dev/null
+++ b/src/git-repository-provider.js
@@ -0,0 +1,107 @@
+const fs = require('fs');
+const { Directory } = require('pathwatcher');
+const GitRepository = require('./git-repository');
+
+// Returns the .gitdir path in the agnostic Git symlink .git file given, or
+// null if the path is not a valid gitfile.
+//
+// * `gitFile` {String} path of gitfile to parse
+const gitFileRegex = RegExp('^gitdir: (.+)');
+function pathFromGitFile(gitFile) {
+  try {
+    const gitFileBuff = fs.readFileSync(gitFile, 'utf8');
+    return gitFileBuff != null ? gitFileBuff.match(gitFileRegex)[1] : undefined;
+  } catch (error) {}
+}
+
+// Checks whether a valid `.git` directory is contained within the given
+// directory or one of its ancestors. If so, a Directory that corresponds to the
+// `.git` folder will be returned. Otherwise, returns `null`.
+//
+// * `directory` {Directory} to explore whether it is part of a Git repository.
+function findGitDirectorySync(directory) {
+  // TODO: Fix node-pathwatcher/src/directory.coffee so the following methods
+  // can return cached values rather than always returning new objects:
+  // getParent(), getFile(), getSubdirectory().
+  let gitDir = directory.getSubdirectory('.git');
+  const gitDirPath = pathFromGitFile(
+    typeof gitDir.getPath === 'function' ? gitDir.getPath() : undefined
+  );
+  if (gitDirPath) {
+    gitDir = new Directory(directory.resolve(gitDirPath));
+  }
+  if (
+    (typeof gitDir.existsSync === 'function' ? gitDir.existsSync() : undefined) &&
+    isValidGitDirectorySync(gitDir)
+  ) {
+    return gitDir;
+  } else if (directory.isRoot()) {
+    return null;
+  } else {
+    return findGitDirectorySync(directory.getParent());
+  }
+}
+
+// Returns a boolean indicating whether the specified directory represents a Git
+// repository.
+//
+// * `directory` {Directory} whose base name is `.git`.
+function isValidGitDirectorySync(directory) {
+  // To decide whether a directory has a valid .git folder, we use
+  // the heuristic adopted by the valid_repository_path() function defined in
+  // node_modules/git-utils/deps/libgit2/src/repository.c.
+  return (
+    directory.getSubdirectory('objects').existsSync() &&
+    directory.getFile('HEAD').existsSync() &&
+    directory.getSubdirectory('refs').existsSync()
+  );
+}
+
+// Provider that conforms to the atom.repository-provider@0.1.0 service.
+class GitRepositoryProvider {
+  constructor(project, config) {
+    // Keys are real paths that end in `.git`.
+    // Values are the corresponding GitRepository objects.
+    this.project = project;
+    this.config = config;
+    this.pathToRepository = {};
+  }
+
+  // Returns a {Promise} that resolves with either:
+  // * {GitRepository} if the given directory has a Git repository.
+  // * `null` if the given directory does not have a Git repository.
+  repositoryForDirectory(directory) {
+    // TODO: Currently, this method is designed to be async, but it relies on a
+    // synchronous API. It should be rewritten to be truly async.
+    return Promise.resolve(this.repositoryForDirectorySync(directory));
+  }
+
+  // Returns either:
+  // * {GitRepository} if the given directory has a Git repository.
+  // * `null` if the given directory does not have a Git repository.
+  repositoryForDirectorySync(directory) {
+    // Only one GitRepository should be created for each .git folder. Therefore,
+    // we must check directory and its parent directories to find the nearest
+    // .git folder.
+    const gitDir = findGitDirectorySync(directory);
+    if (!gitDir) {
+      return null;
+    }
+
+    const gitDirPath = gitDir.getPath();
+    let repo = this.pathToRepository[gitDirPath];
+    if (!repo) {
+      repo = GitRepository.open(gitDirPath, { project: this.project, config: this.config });
+      if (!repo) {
+        return null;
+      }
+      repo.onDidDestroy(() => delete this.pathToRepository[gitDirPath]);
+      this.pathToRepository[gitDirPath] = repo;
+      repo.refreshIndex();
+      repo.refreshStatus();
+    }
+    return repo;
+  }
+}
+
+module.exports = GitRepositoryProvider;