diff --git a/lib/classes/requirejs.php b/lib/classes/requirejs.php
index 91f062fee55..9877a9b55d5 100644
--- a/lib/classes/requirejs.php
+++ b/lib/classes/requirejs.php
@@ -40,11 +40,11 @@ class core_requirejs {
      *
      * @param string $component The component determines the folder the js file should be in.
      * @param string $jsfilename The filename for the module (with the js extension).
-     * @param boolean $debug If true, returns the paths to the original (unminified) source files.
+     * @param bool $unused
      * @return array $files An array of mappings from module names to file paths.
      *                      Empty array if the file does not exist.
      */
-    public static function find_one_amd_module($component, $jsfilename, $debug = false) {
+    public static function find_one_amd_module($component, $jsfilename, $unused = false) {
         $jsfileroot = core_component::get_component_directory($component);
         if (!$jsfileroot) {
             return array();
@@ -54,10 +54,6 @@ class core_requirejs {
 
         $srcdir = $jsfileroot . '/amd/build';
         $minpart = '.min';
-        if ($debug) {
-            $srcdir = $jsfileroot . '/amd/src';
-            $minpart = '';
-        }
 
         $filename = $srcdir . '/' . $module . $minpart . '.js';
         if (!file_exists($filename)) {
@@ -74,11 +70,11 @@ class core_requirejs {
      * The expected location for amd modules is:
      *  <componentdir>/amd/src/modulename.js
      *
-     * @param boolean $debug If true, returns the paths to the original (unminified) source files.
+     * @param boolean $unused
      * @param boolean $includelazy If true, includes modules with the -lazy suffix.
      * @return array $files An array of mappings from module names to file paths.
      */
-    public static function find_all_amd_modules($debug = false, $includelazy = false) {
+    public static function find_all_amd_modules($unused = false, $includelazy = false) {
         global $CFG;
 
         $jsdirs = array();
@@ -106,9 +102,6 @@ class core_requirejs {
 
         foreach ($jsdirs as $component => $dir) {
             $srcdir = $dir . '/build';
-            if ($debug) {
-                $srcdir = $dir . '/src';
-            }
             if (!is_dir($srcdir) || !is_readable($srcdir)) {
                 // This is probably an empty amd directory without src or build.
                 // Skip it - RecursiveDirectoryIterator fatals if the directory is not readable as an iterator.
diff --git a/lib/jssourcemap.php b/lib/jssourcemap.php
index a39a451b64c..f6e5e38d1cb 100644
--- a/lib/jssourcemap.php
+++ b/lib/jssourcemap.php
@@ -45,7 +45,7 @@ $file = '/' . min_clean_param($file, 'SAFEPATH');
 [$unused, $component, $module] = explode('/', $file, 3);
 
 // When running a lazy load, we only deal with one file so we can just return the working sourcemap.
-$jsfiles = core_requirejs::find_one_amd_module($component, $module, false);
+$jsfiles = core_requirejs::find_one_amd_module($component, $module);
 $jsfile = reset($jsfiles);
 
 $mapfile = $jsfile . '.map';
diff --git a/lib/requirejs.php b/lib/requirejs.php
index 46cace6e803..6da961ba892 100644
--- a/lib/requirejs.php
+++ b/lib/requirejs.php
@@ -128,7 +128,7 @@ if ($rev > 0 and $rev < (time() + 60 * 60)) {
 
 // If we've made it here then we're in "dev mode" where everything is lazy loaded.
 // So all files will be served one at a time.
-$jsfiles = core_requirejs::find_one_amd_module($component, $module, false);
+$jsfiles = core_requirejs::find_one_amd_module($component, $module);
 
 if (!empty($jsfiles)) {
     $modulename = array_keys($jsfiles)[0];
diff --git a/lib/tests/requirejs_test.php b/lib/tests/requirejs_test.php
index e53ee783e21..8a88795a410 100644
--- a/lib/tests/requirejs_test.php
+++ b/lib/tests/requirejs_test.php
@@ -42,42 +42,17 @@ class core_requirejs_testcase extends advanced_testcase {
         global $CFG;
 
         // Find a core module.
-        $result = core_requirejs::find_one_amd_module('core', 'templates', false);
+        $result = core_requirejs::find_one_amd_module('core', 'templates');
         $expected = ['core/templates' => $CFG->dirroot . '/lib/amd/build/templates.min.js'];
         $this->assertEquals($expected, $result);
 
-        $result = core_requirejs::find_one_amd_module('core', 'templates', true);
-        $expected = ['core/templates' => $CFG->dirroot . '/lib/amd/src/templates.js'];
-        $this->assertEquals($expected, $result);
-
         // Find a subsystem module (none exist yet).
-        $result = core_requirejs::find_one_amd_module('core_group', 'doesnotexist', false);
+        $result = core_requirejs::find_one_amd_module('core_group', 'doesnotexist');
         $expected = [];
         $this->assertEquals($expected, $result);
 
-        // Find a plugin module.
-        $result = core_requirejs::find_one_amd_module('mod_assign', 'grading_panel', true);
-        $expected = ['mod_assign/grading_panel' => $CFG->dirroot . '/mod/assign/amd/src/grading_panel.js'];
-        $this->assertEquals($expected, $result);
-
-        // Find all modules - no debugging.
-        $result = core_requirejs::find_all_amd_modules(true);
-        foreach ($result as $key => $path) {
-            // Lets verify the first part of the key is a valid component name and the second part correctly contains "min" or not.
-            list($component, $template) = explode('/', $key, 2);
-            // Can we resolve it to a valid dir?
-            $dir = core_component::get_component_directory($component);
-            $this->assertNotEmpty($dir);
-
-            // Only "core" is allowed to have no _ in component names.
-            if (strpos($component, '_') === false) {
-                $this->assertEquals('core', $component);
-            }
-            $this->assertStringNotContainsString('.min', $path);
-        }
-
-        // Find all modules - debugging.
-        $result = core_requirejs::find_all_amd_modules(false);
+        // Find all modules.
+        $result = core_requirejs::find_all_amd_modules();
         foreach ($result as $key => $path) {
             // Lets verify the first part of the key is a valid component name and the second part correctly contains "min" or not.
             list($component, $template) = explode('/', $key, 2);