diff --git a/baselines/audioworklet.generated.d.ts b/baselines/audioworklet.generated.d.ts
index 1002c57b0..1251b78c5 100644
--- a/baselines/audioworklet.generated.d.ts
+++ b/baselines/audioworklet.generated.d.ts
@@ -1586,6 +1586,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 76130d49d..6bf5369d9 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -7468,6 +7468,7 @@ declare var CSSStyleSheet: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -20772,6 +20773,7 @@ declare var MediaSource: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaSourceHandle)
  */
 interface MediaSourceHandle {
+    __brand: "MediaSourceHandle";
 }
 
 declare var MediaSourceHandle: {
@@ -24119,6 +24121,7 @@ declare var PerformanceTiming: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PeriodicWave)
  */
 interface PeriodicWave {
+    __brand: "PeriodicWave";
 }
 
 declare var PeriodicWave: {
@@ -25613,6 +25616,7 @@ declare var RTCRtpReceiver: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCRtpScriptTransform)
  */
 interface RTCRtpScriptTransform {
+    __brand: "RTCRtpScriptTransform";
 }
 
 declare var RTCRtpScriptTransform: {
@@ -35350,6 +35354,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -35382,6 +35387,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -35395,6 +35401,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -35408,6 +35415,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -35421,6 +35429,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -36366,6 +36375,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -36379,6 +36389,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -36423,6 +36434,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -36436,6 +36448,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -36449,6 +36462,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -36462,6 +36476,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -36475,6 +36490,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -38168,6 +38184,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/serviceworker.generated.d.ts b/baselines/serviceworker.generated.d.ts
index 6430a4b66..39fa1632c 100644
--- a/baselines/serviceworker.generated.d.ts
+++ b/baselines/serviceworker.generated.d.ts
@@ -1555,6 +1555,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -9157,6 +9158,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -9189,6 +9191,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -9202,6 +9205,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -9215,6 +9219,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -9228,6 +9233,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -10171,6 +10177,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -10184,6 +10191,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -10228,6 +10236,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -10241,6 +10250,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -10254,6 +10264,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -10267,6 +10278,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -10280,6 +10292,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -10961,6 +10974,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/sharedworker.generated.d.ts b/baselines/sharedworker.generated.d.ts
index 6ce6e8fb6..ec6ce63ed 100644
--- a/baselines/sharedworker.generated.d.ts
+++ b/baselines/sharedworker.generated.d.ts
@@ -1491,6 +1491,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -8700,6 +8701,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -8732,6 +8734,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -8745,6 +8748,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -8758,6 +8762,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -8771,6 +8776,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -9714,6 +9720,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -9727,6 +9734,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -9771,6 +9779,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -9784,6 +9793,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -9797,6 +9807,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -9810,6 +9821,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -9823,6 +9835,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -10687,6 +10700,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.5/audioworklet.generated.d.ts b/baselines/ts5.5/audioworklet.generated.d.ts
index 9b946e70a..ef3d1e36a 100644
--- a/baselines/ts5.5/audioworklet.generated.d.ts
+++ b/baselines/ts5.5/audioworklet.generated.d.ts
@@ -1586,6 +1586,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.5/dom.generated.d.ts b/baselines/ts5.5/dom.generated.d.ts
index 8026268fb..5510fc384 100644
--- a/baselines/ts5.5/dom.generated.d.ts
+++ b/baselines/ts5.5/dom.generated.d.ts
@@ -7460,6 +7460,7 @@ declare var CSSStyleSheet: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -20751,6 +20752,7 @@ declare var MediaSource: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaSourceHandle)
  */
 interface MediaSourceHandle {
+    __brand: "MediaSourceHandle";
 }
 
 declare var MediaSourceHandle: {
@@ -24098,6 +24100,7 @@ declare var PerformanceTiming: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PeriodicWave)
  */
 interface PeriodicWave {
+    __brand: "PeriodicWave";
 }
 
 declare var PeriodicWave: {
@@ -25592,6 +25595,7 @@ declare var RTCRtpReceiver: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCRtpScriptTransform)
  */
 interface RTCRtpScriptTransform {
+    __brand: "RTCRtpScriptTransform";
 }
 
 declare var RTCRtpScriptTransform: {
@@ -35327,6 +35331,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -35359,6 +35364,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -35372,6 +35378,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -35385,6 +35392,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -35398,6 +35406,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -36343,6 +36352,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -36356,6 +36366,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -36400,6 +36411,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -36413,6 +36425,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -36426,6 +36439,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -36439,6 +36453,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -36452,6 +36467,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -38145,6 +38161,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.5/serviceworker.generated.d.ts b/baselines/ts5.5/serviceworker.generated.d.ts
index 6847b2bec..00cd12db6 100644
--- a/baselines/ts5.5/serviceworker.generated.d.ts
+++ b/baselines/ts5.5/serviceworker.generated.d.ts
@@ -1555,6 +1555,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -9157,6 +9158,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -9189,6 +9191,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -9202,6 +9205,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -9215,6 +9219,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -9228,6 +9233,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -10171,6 +10177,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -10184,6 +10191,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -10228,6 +10236,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -10241,6 +10250,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -10254,6 +10264,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -10267,6 +10278,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -10280,6 +10292,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -10961,6 +10974,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.5/sharedworker.generated.d.ts b/baselines/ts5.5/sharedworker.generated.d.ts
index de00fa37c..7e082c7ef 100644
--- a/baselines/ts5.5/sharedworker.generated.d.ts
+++ b/baselines/ts5.5/sharedworker.generated.d.ts
@@ -1491,6 +1491,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -8700,6 +8701,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -8732,6 +8734,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -8745,6 +8748,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -8758,6 +8762,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -8771,6 +8776,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -9714,6 +9720,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -9727,6 +9734,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -9771,6 +9779,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -9784,6 +9793,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -9797,6 +9807,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -9810,6 +9821,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -9823,6 +9835,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -10687,6 +10700,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.5/webworker.generated.d.ts b/baselines/ts5.5/webworker.generated.d.ts
index cdaec1532..39c13dc22 100644
--- a/baselines/ts5.5/webworker.generated.d.ts
+++ b/baselines/ts5.5/webworker.generated.d.ts
@@ -2023,6 +2023,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -5846,6 +5847,7 @@ declare var MediaCapabilities: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaSourceHandle)
  */
 interface MediaSourceHandle {
+    __brand: "MediaSourceHandle";
 }
 
 declare var MediaSourceHandle: {
@@ -10591,6 +10593,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -10623,6 +10626,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -10636,6 +10640,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -10649,6 +10654,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -10662,6 +10668,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -11605,6 +11612,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -11618,6 +11626,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -11662,6 +11671,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -11675,6 +11685,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -11688,6 +11699,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -11701,6 +11713,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -11714,6 +11727,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -12615,6 +12629,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.6/audioworklet.generated.d.ts b/baselines/ts5.6/audioworklet.generated.d.ts
index 9b946e70a..ef3d1e36a 100644
--- a/baselines/ts5.6/audioworklet.generated.d.ts
+++ b/baselines/ts5.6/audioworklet.generated.d.ts
@@ -1586,6 +1586,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.6/dom.generated.d.ts b/baselines/ts5.6/dom.generated.d.ts
index 6e5cae9e1..ca73df202 100644
--- a/baselines/ts5.6/dom.generated.d.ts
+++ b/baselines/ts5.6/dom.generated.d.ts
@@ -7468,6 +7468,7 @@ declare var CSSStyleSheet: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -20772,6 +20773,7 @@ declare var MediaSource: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaSourceHandle)
  */
 interface MediaSourceHandle {
+    __brand: "MediaSourceHandle";
 }
 
 declare var MediaSourceHandle: {
@@ -24119,6 +24121,7 @@ declare var PerformanceTiming: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PeriodicWave)
  */
 interface PeriodicWave {
+    __brand: "PeriodicWave";
 }
 
 declare var PeriodicWave: {
@@ -25613,6 +25616,7 @@ declare var RTCRtpReceiver: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCRtpScriptTransform)
  */
 interface RTCRtpScriptTransform {
+    __brand: "RTCRtpScriptTransform";
 }
 
 declare var RTCRtpScriptTransform: {
@@ -35350,6 +35354,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -35382,6 +35387,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -35395,6 +35401,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -35408,6 +35415,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -35421,6 +35429,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -36366,6 +36375,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -36379,6 +36389,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -36423,6 +36434,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -36436,6 +36448,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -36449,6 +36462,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -36462,6 +36476,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -36475,6 +36490,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -38168,6 +38184,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.6/serviceworker.generated.d.ts b/baselines/ts5.6/serviceworker.generated.d.ts
index 6847b2bec..00cd12db6 100644
--- a/baselines/ts5.6/serviceworker.generated.d.ts
+++ b/baselines/ts5.6/serviceworker.generated.d.ts
@@ -1555,6 +1555,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -9157,6 +9158,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -9189,6 +9191,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -9202,6 +9205,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -9215,6 +9219,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -9228,6 +9233,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -10171,6 +10177,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -10184,6 +10191,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -10228,6 +10236,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -10241,6 +10250,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -10254,6 +10264,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -10267,6 +10278,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -10280,6 +10292,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -10961,6 +10974,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.6/sharedworker.generated.d.ts b/baselines/ts5.6/sharedworker.generated.d.ts
index de00fa37c..7e082c7ef 100644
--- a/baselines/ts5.6/sharedworker.generated.d.ts
+++ b/baselines/ts5.6/sharedworker.generated.d.ts
@@ -1491,6 +1491,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -8700,6 +8701,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -8732,6 +8734,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -8745,6 +8748,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -8758,6 +8762,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -8771,6 +8776,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -9714,6 +9720,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -9727,6 +9734,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -9771,6 +9779,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -9784,6 +9793,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -9797,6 +9807,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -9810,6 +9821,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -9823,6 +9835,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -10687,6 +10700,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/ts5.6/webworker.generated.d.ts b/baselines/ts5.6/webworker.generated.d.ts
index cdaec1532..39c13dc22 100644
--- a/baselines/ts5.6/webworker.generated.d.ts
+++ b/baselines/ts5.6/webworker.generated.d.ts
@@ -2023,6 +2023,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -5846,6 +5847,7 @@ declare var MediaCapabilities: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaSourceHandle)
  */
 interface MediaSourceHandle {
+    __brand: "MediaSourceHandle";
 }
 
 declare var MediaSourceHandle: {
@@ -10591,6 +10593,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -10623,6 +10626,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -10636,6 +10640,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -10649,6 +10654,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -10662,6 +10668,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -11605,6 +11612,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -11618,6 +11626,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -11662,6 +11671,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -11675,6 +11685,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -11688,6 +11699,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -11701,6 +11713,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -11714,6 +11727,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -12615,6 +12629,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index 800f6b628..9b2d5bc6b 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -2023,6 +2023,7 @@ declare var CSSSkewY: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleValue)
  */
 interface CSSStyleValue {
+    __brand: "CSSStyleValue";
     toString(): string;
 }
 
@@ -5846,6 +5847,7 @@ declare var MediaCapabilities: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/MediaSourceHandle)
  */
 interface MediaSourceHandle {
+    __brand: "MediaSourceHandle";
 }
 
 declare var MediaSourceHandle: {
@@ -10591,6 +10593,7 @@ declare var WebGLActiveInfo: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLBuffer)
  */
 interface WebGLBuffer {
+    __brand: "WebGLBuffer";
 }
 
 declare var WebGLBuffer: {
@@ -10623,6 +10626,7 @@ declare var WebGLContextEvent: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLFramebuffer)
  */
 interface WebGLFramebuffer {
+    __brand: "WebGLFramebuffer";
 }
 
 declare var WebGLFramebuffer: {
@@ -10636,6 +10640,7 @@ declare var WebGLFramebuffer: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLProgram)
  */
 interface WebGLProgram {
+    __brand: "WebGLProgram";
 }
 
 declare var WebGLProgram: {
@@ -10649,6 +10654,7 @@ declare var WebGLProgram: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLQuery)
  */
 interface WebGLQuery {
+    __brand: "WebGLQuery";
 }
 
 declare var WebGLQuery: {
@@ -10662,6 +10668,7 @@ declare var WebGLQuery: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderbuffer)
  */
 interface WebGLRenderbuffer {
+    __brand: "WebGLRenderbuffer";
 }
 
 declare var WebGLRenderbuffer: {
@@ -11605,6 +11612,7 @@ interface WebGLRenderingContextOverloads {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSampler)
  */
 interface WebGLSampler {
+    __brand: "WebGLSampler";
 }
 
 declare var WebGLSampler: {
@@ -11618,6 +11626,7 @@ declare var WebGLSampler: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLShader)
  */
 interface WebGLShader {
+    __brand: "WebGLShader";
 }
 
 declare var WebGLShader: {
@@ -11662,6 +11671,7 @@ declare var WebGLShaderPrecisionFormat: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLSync)
  */
 interface WebGLSync {
+    __brand: "WebGLSync";
 }
 
 declare var WebGLSync: {
@@ -11675,6 +11685,7 @@ declare var WebGLSync: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTexture)
  */
 interface WebGLTexture {
+    __brand: "WebGLTexture";
 }
 
 declare var WebGLTexture: {
@@ -11688,6 +11699,7 @@ declare var WebGLTexture: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLTransformFeedback)
  */
 interface WebGLTransformFeedback {
+    __brand: "WebGLTransformFeedback";
 }
 
 declare var WebGLTransformFeedback: {
@@ -11701,6 +11713,7 @@ declare var WebGLTransformFeedback: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLUniformLocation)
  */
 interface WebGLUniformLocation {
+    __brand: "WebGLUniformLocation";
 }
 
 declare var WebGLUniformLocation: {
@@ -11714,6 +11727,7 @@ declare var WebGLUniformLocation: {
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLVertexArrayObject)
  */
 interface WebGLVertexArrayObject {
+    __brand: "WebGLVertexArrayObject";
 }
 
 declare var WebGLVertexArrayObject: {
@@ -12615,6 +12629,7 @@ declare namespace WebAssembly {
 
     /** [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module) */
     interface Module {
+        __brand: "Module";
     }
 
     var Module: {
diff --git a/inputfiles/overridingTypes.jsonc b/inputfiles/overridingTypes.jsonc
index 8a5a30d30..3c039d4a3 100644
--- a/inputfiles/overridingTypes.jsonc
+++ b/inputfiles/overridingTypes.jsonc
@@ -1973,6 +1973,10 @@
                     }
                 }
             },
+            "FragmentDirective": {
+                // https://github.com/WICG/scroll-to-text-fragment/issues/264
+                "preventNominal": true
+            },
             // XXX: Float16Array is esnext-only as of 2025-04
             // Not sure what to do here, for now disable it.
             "Float16Array": {
@@ -3373,6 +3377,10 @@
                     ]
                 }
             },
+            "WorkletGlobalScope": {
+                // Global scope, never passed via parameter
+                "preventNominal": true
+            },
             "InstallEvent": {
                 // https://github.com/mdn/browser-compat-data/issues/22591
                 "exposed": ""
diff --git a/src/build/emitter.ts b/src/build/emitter.ts
index 14189ed17..43f952ac5 100644
--- a/src/build/emitter.ts
+++ b/src/build/emitter.ts
@@ -1427,6 +1427,28 @@ export function emitWebIdl(
     }
   }
 
+  function isEmptyInterface(i: Browser.Interface) {
+    if (
+      i.preventNominal ||
+      i.extends ||
+      i.implements ||
+      i.iterator ||
+      i.overrideIndexSignatures ||
+      i.noInterfaceObject
+    ) {
+      return false;
+    }
+    if (mapToArray(i.properties?.property).length) {
+      return false;
+    }
+    if (mapToArray(i.constants?.constant).length) {
+      return false;
+    }
+    const methods = { ...i.methods?.method };
+    delete methods.toJSON;
+    return !mapToArray(methods).filter((m) => !m.static).length;
+  }
+
   function emitInterface(i: Browser.Interface) {
     printer.clearStack();
     emitInterfaceEventMap(i);
@@ -1434,6 +1456,10 @@ export function emitWebIdl(
     emitInterfaceDeclaration(i);
     printer.increaseIndent();
 
+    if (isEmptyInterface(i)) {
+      printer.printLine(`__brand: "${i.name}";`);
+    }
+
     emitMembers(/*prefix*/ "", EmitScope.InstanceOnly, i);
     emitConstants(i);
     emitEventHandlers(/*prefix*/ "", i);
diff --git a/src/build/types.d.ts b/src/build/types.d.ts
index 53bdece01..54a96b2f7 100644
--- a/src/build/types.d.ts
+++ b/src/build/types.d.ts
@@ -201,6 +201,11 @@ export interface Interface {
   secureContext?: boolean;
   mdnUrl?: string;
   transferable?: boolean;
+
+  // Prevents `__brand` member even if the interface is empty.
+  // Use this when the interface is only used as a return value
+  // and never as a parameter.
+  preventNominal?: boolean;
 }
 
 export interface Iterator {