3 files changed, 46 insertions, 4 deletions
diff --git a/platform/web/SCsub b/platform/web/SCsub
index 077024507a..e44e59bfb9 100644
--- a/platform/web/SCsub
+++ b/platform/web/SCsub
@@ -38,15 +38,20 @@ sys_env.AddJSLibraries(
         "js/libs/library_godot_webgl2.js",
     ]
 )
+sys_env.AddJSExterns(
+    [
+        "js/libs/library_godot_webgl2.externs.js",
+    ]
+)
 
 if env["javascript_eval"]:
     sys_env.AddJSLibraries(["js/libs/library_godot_javascript_singleton.js"])
 
 for lib in sys_env["JS_LIBS"]:
     sys_env.Append(LINKFLAGS=["--js-library", lib.abspath])
-for js in env["JS_PRE"]:
+for js in sys_env["JS_PRE"]:
     sys_env.Append(LINKFLAGS=["--pre-js", js.abspath])
-for ext in env["JS_EXTERNS"]:
+for ext in sys_env["JS_EXTERNS"]:
     sys_env["ENV"]["EMCC_CLOSURE_ARGS"] += " --externs " + ext.abspath
 
 build = []
diff --git a/platform/web/js/libs/library_godot_webgl2.externs.js b/platform/web/js/libs/library_godot_webgl2.externs.js
new file mode 100644
index 0000000000..18d8d0815a
--- /dev/null
+++ b/platform/web/js/libs/library_godot_webgl2.externs.js
@@ -0,0 +1,36 @@
+
+/**
+ * @constructor OVR_multiview2
+ */
+function OVR_multiview2() {}
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_OVR;
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_OVR;
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.MAX_VIEWS_OVR;
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.FRAMEBUFFER_INCOMPLETE_VIEW_TARGETS_OVR;
+
+/**
+ * @param {number} target
+ * @param {number} attachment
+ * @param {WebGLTexture} texture
+ * @param {number} level
+ * @param {number} baseViewIndex
+ * @param {number} numViews
+ * @return {void}
+ */
+OVR_multiview2.prototype.framebufferTextureMultiviewOVR = function(target, attachment, texture, level, baseViewIndex, numViews) {};
diff --git a/platform/web/js/libs/library_godot_webgl2.js b/platform/web/js/libs/library_godot_webgl2.js
index 365f712be7..ba990b3ee0 100644
--- a/platform/web/js/libs/library_godot_webgl2.js
+++ b/platform/web/js/libs/library_godot_webgl2.js
@@ -37,14 +37,15 @@ const GodotWebGL2 = {
 	godot_webgl2_glFramebufferTextureMultiviewOVR: function (target, attachment, texture, level, base_view_index, num_views) {
 		const context = GL.currentContext;
 		if (typeof context.multiviewExt === 'undefined') {
-			const ext = context.GLctx.getExtension('OVR_multiview2');
+			const /** OVR_multiview2 */ ext = context.GLctx.getExtension('OVR_multiview2');
 			if (!ext) {
 				console.error('Trying to call glFramebufferTextureMultiviewOVR() without the OVR_multiview2 extension');
 				return;
 			}
 			context.multiviewExt = ext;
 		}
-		context.multiviewExt.framebufferTextureMultiviewOVR(target, attachment, GL.textures[texture], level, base_view_index, num_views);
+		const /** OVR_multiview2 */ ext = context.multiviewExt;
+		ext.framebufferTextureMultiviewOVR(target, attachment, GL.textures[texture], level, base_view_index, num_views);
 	},
 };