diff --git a/src/Module/Functions.php b/src/Module/Functions.php
index 4a6dc72..1c836f2 100644
--- a/src/Module/Functions.php
+++ b/src/Module/Functions.php
@@ -22,6 +22,7 @@ public function load(\Transphporm\Config $config) {
 		$functionSet->addFunction('template', $templateFunction);
 		$functionSet->addFunction('json', new \Transphporm\TSSFunction\Json($baseDir));
         $functionSet->addFunction('constant', new \Transphporm\TSSFunction\Constant());
+		$functionSet->addFunction('file', new \Transphporm\TSSFunction\File($baseDir));
 
 		// Register HTML formatter here because it uses the template function
 		$config->registerFormatter(new \Transphporm\Formatter\HTMLFormatter($templateFunction));
diff --git a/src/TSSFunction/File.php b/src/TSSFunction/File.php
new file mode 100644
index 0000000..00f3745
--- /dev/null
+++ b/src/TSSFunction/File.php
@@ -0,0 +1,36 @@
+<?php
+/**
+ * @file File.php
+ * Replace with one line description.
+ */
+namespace Transphporm\TSSFunction;
+
+class File implements \Transphporm\TSSFunction
+{
+    private $filePath;
+
+    public function __construct(\Transphporm\FilePath $filePath)
+    {
+        $this->filePath = $filePath;
+    }
+
+    /**
+     * @param array $args
+     * @param \DomElement|null $element
+     *
+     * @return array
+     * @throws \Exception
+     */
+    public function run(array $args, \DomElement $element = null)
+    {
+        $fileContents = $args[0];
+
+        $path = $this->filePath->getFilePath($fileContents);
+        if (!file_exists($path)) {
+            throw new \Exception('File does not exist at: ' . $path);
+        }
+        $fileContents = file_get_contents($path);
+
+        return $fileContents;
+    }
+}
diff --git a/tests/DateFormatTest.php b/tests/DateFormatTest.php
index c009d07..6245cc9 100644
--- a/tests/DateFormatTest.php
+++ b/tests/DateFormatTest.php
@@ -120,7 +120,7 @@ public function testWeeksAgo() {
 	}
 
 	public function testWeeksin() {
-		$this->assertEquals('in 2 weeks', $this->relative('+2 weeks'));
+		$this->assertEquals('in 3 weeks', $this->relative('+3 weeks'));
 	}
 
 	public function testMonthsAgo() {
diff --git a/tests/TransphpormTest.php b/tests/TransphpormTest.php
index 501a782..27461d8 100644
--- a/tests/TransphpormTest.php
+++ b/tests/TransphpormTest.php
@@ -1436,6 +1436,27 @@ public function testJsonFile() {
 		unlink($file);
 	}
 
+    public function testFile() {
+        $data = <<<JS
+let j = 0;
+if (j < 4) {
+    console.log('j' + " is less than 4");
+}
+JS;
+
+        $file = __DIR__ . 'data.file';
+        file_put_contents($file, $data);
+
+        $xml = "<script></script>";
+        $tss = 'script { content: file("' . $file . '"); }';
+
+        $template = new \Transphporm\Builder($xml, $tss);
+
+		$this->assertEquals($this->stripTabs("<script>$data</script>"), $this->stripTabs($template->output($data)->body));
+
+		unlink($file);
+    }
+
 	public function testRoot() {
 		$xml = "
 		<div></div>