diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 1c75c7380..8fb999b5d 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -1028,8 +1028,8 @@ interface PeriodicWaveConstraints {
 }
 
 interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
+    imag?: Float32Array;
+    real?: Float32Array;
 }
 
 interface PointerEventInit extends MouseEventInit {
@@ -1540,8 +1540,8 @@ interface VRDisplayEventInit extends EventInit {
 }
 
 interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
+    leftBounds?: Float32Array | null;
+    rightBounds?: Float32Array | null;
     source?: HTMLCanvasElement | null;
 }
 
@@ -1552,7 +1552,7 @@ interface VRStageParameters {
 }
 
 interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
+    curve?: Float32Array;
     oversample?: OverSampleType;
 }
 
@@ -1955,7 +1955,7 @@ interface AudioParam {
     linearRampToValueAtTime(value: number, endTime: number): AudioParam;
     setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
     setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
+    setValueCurveAtTime(values: Float32Array, startTime: number, duration: number): AudioParam;
 }
 
 declare var AudioParam: {
diff --git a/src/emitter.ts b/src/emitter.ts
index 65e83d808..31a20c8d3 100644
--- a/src/emitter.ts
+++ b/src/emitter.ts
@@ -296,12 +296,16 @@ export function emitWebIDl(webidl: Browser.WebIdl, flavor: Flavor) {
         const subtypeString = subtype ? subtype.nullable ? makeNullable(subtype.name) : subtype.name : undefined;
 
         return {
-            name: (type.name === "Array" && subtypeString) ? makeArrayType(subtypeString) : `${type.name}${subtypeString ? `<${subtypeString}>` : ""}`,
+            name: (type.name === "Array" && subtypeString) ? makeArrayType(subtypeString, obj) : `${type.name}${subtypeString ? `<${subtypeString}>` : ""}`,
             nullable: type.nullable
         };
     }
 
-    function makeArrayType(elementType: string): string {
+    function makeArrayType (elementType: string, obj: Browser.Typed): string {
+        if (obj.subtype && obj.subtype.type === "float") {
+            return "Float32Array";
+        }
+
         return elementType.includes("|") ? `(${elementType})[]` : `${elementType}[]`;
     }