Support [PutForwards] for TS>5.5 (microsoft#1838)

Co-authored-by: saschanaz <saschanaz@users.noreply.github.com>

Author: saschanaz

baselines/dom.generated.d.ts

@@ -3634,7 +3634,8 @@ declare var CSSCounterStyleRule: {
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSFontFaceRule) */
 interface CSSFontFaceRule extends CSSRule {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSFontFaceRule/style) */
-    readonly style: CSSStyleDeclaration;
+    get style(): CSSStyleDeclaration;
+    set style(cssText: string);
 }
 
 declare var CSSFontFaceRule: {
@@ -3705,7 +3706,8 @@ interface CSSImportRule extends CSSRule {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSImportRule/layerName) */
     readonly layerName: string | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSImportRule/media) */
-    readonly media: MediaList;
+    get media(): MediaList;
+    set media(mediaText: string);
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSImportRule/styleSheet) */
     readonly styleSheet: CSSStyleSheet | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSImportRule/supportsText) */
@@ -3726,7 +3728,8 @@ interface CSSKeyframeRule extends CSSRule {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSKeyframeRule/keyText) */
     keyText: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSKeyframeRule/style) */
-    readonly style: CSSStyleDeclaration;
+    get style(): CSSStyleDeclaration;
+    set style(cssText: string);
 }
 
 declare var CSSKeyframeRule: {
@@ -3899,7 +3902,8 @@ declare var CSSMatrixComponent: {
  */
 interface CSSMediaRule extends CSSConditionRule {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSMediaRule/media) */
-    readonly media: MediaList;
+    get media(): MediaList;
+    set media(mediaText: string);
 }
 
 declare var CSSMediaRule: {
@@ -3925,7 +3929,8 @@ declare var CSSNamespaceRule: {
 };
 
 interface CSSNestedDeclarations extends CSSRule {
-    readonly style: CSSStyleDeclaration;
+    get style(): CSSStyleDeclaration;
+    set style(cssText: string);
 }
 
 declare var CSSNestedDeclarations: {
@@ -3986,7 +3991,8 @@ interface CSSPageRule extends CSSGroupingRule {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSPageRule/selectorText) */
     selectorText: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSPageRule/style) */
-    readonly style: CSSStyleDeclaration;
+    get style(): CSSStyleDeclaration;
+    set style(cssText: string);
 }
 
 declare var CSSPageRule: {
@@ -5480,7 +5486,8 @@ interface CSSStyleRule extends CSSGroupingRule {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleRule/selectorText) */
     selectorText: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleRule/style) */
-    readonly style: CSSStyleDeclaration;
+    get style(): CSSStyleDeclaration;
+    set style(cssText: string);
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CSSStyleRule/styleMap) */
     readonly styleMap: StylePropertyMap;
 }
@@ -7438,7 +7445,7 @@ interface Document extends Node, DocumentOrShadowRoot, FontFaceSource, GlobalEve
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Document/location)
      */
     get location(): Location;
-    set location(href: string | Location);
+    set location(href: string);
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Document/fullscreenchange_event) */
     onfullscreenchange: ((this: Document, ev: Event) => any) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Document/fullscreenerror_event) */
@@ -8090,7 +8097,8 @@ interface Element extends Node, ARIAMixin, Animatable, ChildNode, NonDocumentTyp
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Element/classList)
      */
-    readonly classList: DOMTokenList;
+    get classList(): DOMTokenList;
+    set classList(value: string);
     /**
      * Returns the value of element's class content attribute. Can be set to change it.
      *
@@ -8135,7 +8143,8 @@ interface Element extends Node, ARIAMixin, Animatable, ChildNode, NonDocumentTyp
     outerHTML: string;
     readonly ownerDocument: Document;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Element/part) */
-    readonly part: DOMTokenList;
+    get part(): DOMTokenList;
+    set part(value: string);
     /**
      * Returns the namespace prefix.
      *
@@ -8351,7 +8360,8 @@ interface ElementCSSInlineStyle {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLElement/attributeStyleMap) */
     readonly attributeStyleMap: StylePropertyMap;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLElement/style) */
-    readonly style: CSSStyleDeclaration;
+    get style(): CSSStyleDeclaration;
+    set style(cssText: string);
 }
 
 interface ElementContentEditable {
@@ -9975,7 +9985,8 @@ interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
      */
     rel: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLAnchorElement/relList) */
-    readonly relList: DOMTokenList;
+    get relList(): DOMTokenList;
+    set relList(value: string);
     /**
      * Sets or retrieves the relationship between the object and the destination of the link.
      * @deprecated
@@ -10034,7 +10045,8 @@ interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLAreaElement/rel) */
     rel: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLAreaElement/relList) */
-    readonly relList: DOMTokenList;
+    get relList(): DOMTokenList;
+    set relList(value: string);
     /** Sets or retrieves the shape of the object. */
     shape: string;
     /**
@@ -10830,7 +10842,8 @@ interface HTMLFormElement extends HTMLElement {
      */
     noValidate: boolean;
     rel: string;
-    readonly relList: DOMTokenList;
+    get relList(): DOMTokenList;
+    set relList(value: string);
     /**
      * Sets or retrieves the window or frame at which to target content.
      *
@@ -11221,7 +11234,8 @@ interface HTMLIFrameElement extends HTMLElement {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLIFrameElement/referrerPolicy) */
     referrerPolicy: ReferrerPolicy;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLIFrameElement/sandbox) */
-    readonly sandbox: DOMTokenList;
+    get sandbox(): DOMTokenList;
+    set sandbox(value: string);
     /**
      * Sets or retrieves whether the frame can be scrolled.
      * @deprecated
@@ -11840,13 +11854,15 @@ interface HTMLLinkElement extends HTMLElement, LinkStyle {
      */
     rel: string;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLLinkElement/relList) */
-    readonly relList: DOMTokenList;
+    get relList(): DOMTokenList;
+    set relList(value: string);
     /**
      * Sets or retrieves the relationship between the object and the destination of the link.
      * @deprecated
      */
     rev: string;
-    readonly sizes: DOMTokenList;
+    get sizes(): DOMTokenList;
+    set sizes(value: string);
     /**
      * Sets or retrieves the window or frame at which to target content.
      * @deprecated
@@ -12604,7 +12620,8 @@ interface HTMLOutputElement extends HTMLElement {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLOutputElement/form) */
     readonly form: HTMLFormElement | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLOutputElement/htmlFor) */
-    readonly htmlFor: DOMTokenList;
+    get htmlFor(): DOMTokenList;
+    set htmlFor(value: string);
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLOutputElement/labels) */
     readonly labels: NodeListOf<HTMLLabelElement>;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/HTMLOutputElement/name) */
@@ -19589,7 +19606,8 @@ declare var Response: {
  */
 interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
     rel: string;
-    readonly relList: DOMTokenList;
+    get relList(): DOMTokenList;
+    set relList(value: string);
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/SVGAElement/target) */
     readonly target: SVGAnimatedString;
     addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -22553,7 +22571,8 @@ interface StyleSheet {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/StyleSheet/href) */
     readonly href: string | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/StyleSheet/media) */
-    readonly media: MediaList;
+    get media(): MediaList;
+    set media(mediaText: string);
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/StyleSheet/ownerNode) */
     readonly ownerNode: Element | ProcessingInstruction | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/StyleSheet/parentStyleSheet) */
@@ -26474,7 +26493,7 @@ interface Window extends EventTarget, AnimationFrameProvider, GlobalEventHandler
     readonly length: number;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Window/location) */
     get location(): Location;
-    set location(href: string | Location);
+    set location(href: string);
     /**
      * Returns true if the location bar is visible; otherwise, returns false.
      *

inputfiles/overridingTypes.jsonc

@@ -599,6 +599,7 @@
                             "deprecated": true
                         },
                         "location": {
+                            // Pre-TS-5.1 hack to make window.location assignable
                             "readonly": false
                         },
                         "onorientationchange": {
@@ -810,7 +811,10 @@
                             "overrideType": "HTMLCollectionOf<HTMLScriptElement>"
                         },
                         "location": {
+                            // Pre-TS-5.1 hack to make document.location assignable
                             "readonly": false,
+                            // Technically this can be null for a detached iframe.
+                            // But that's an edge case and flipping this also breaks compatibility.
                             "nullable": false
                         },
                         "body": {

src/build.ts

@@ -1,7 +1,7 @@
 import * as Browser from "./build/types.js";
 import { promises as fs } from "fs";
 import { merge, resolveExposure, arrayToMap } from "./build/helpers.js";
-import { emitWebIdl } from "./build/emitter.js";
+import { type CompilerBehavior, emitWebIdl } from "./build/emitter.js";
 import { convert } from "./build/widlprocess.js";
 import { getExposedTypes } from "./build/expose.js";
 import {
@@ -37,7 +37,7 @@ interface EmitOptions {
   global: string[];
   name: string;
   outputFolder: URL;
-  useIteratorObject: boolean;
+  compilerBehavior: CompilerBehavior;
 }
 
 async function emitFlavor(
@@ -53,7 +53,7 @@ async function emitFlavor(
     exposed,
     options.global[0],
     "",
-    options.useIteratorObject,
+    options.compilerBehavior,
   );
   await fs.writeFile(
     new URL(`${options.name}.generated.d.ts`, options.outputFolder),
@@ -64,7 +64,7 @@ async function emitFlavor(
     exposed,
     options.global[0],
     "sync",
-    options.useIteratorObject,
+    options.compilerBehavior,
   );
   await fs.writeFile(
     new URL(`${options.name}.iterable.generated.d.ts`, options.outputFolder),
@@ -75,7 +75,7 @@ async function emitFlavor(
     exposed,
     options.global[0],
     "async",
-    options.useIteratorObject,
+    options.compilerBehavior,
   );
   await fs.writeFile(
     new URL(
@@ -294,12 +294,18 @@ async function emitDom() {
   const emitVariations = [
     {
       outputFolder: new URL("./ts5.5/", outputFolder),
-      useIteratorObject: false,
+      compilerBehavior: {},
+    },
+    {
+      outputFolder,
+      compilerBehavior: {
+        useIteratorObject: true,
+        allowUnrelatedSetterType: true,
+      } as CompilerBehavior,
     },
-    { outputFolder, useIteratorObject: true },
   ];
 
-  for (const { outputFolder, useIteratorObject } of emitVariations) {
+  for (const { outputFolder, compilerBehavior } of emitVariations) {
     // Create output folder
     await fs.mkdir(outputFolder, {
       // Doesn't need to be recursive, but this helpfully ignores EEXIST
@@ -310,31 +316,31 @@ async function emitDom() {
       name: "dom",
       global: ["Window"],
       outputFolder,
-      useIteratorObject,
+      compilerBehavior,
     });
     emitFlavor(webidl, new Set(knownTypes.Worker), {
       name: "webworker",
       global: ["Worker", "DedicatedWorker", "SharedWorker", "ServiceWorker"],
       outputFolder,
-      useIteratorObject,
+      compilerBehavior,
     });
     emitFlavor(webidl, new Set(knownTypes.Worker), {
       name: "sharedworker",
       global: ["SharedWorker", "Worker"],
       outputFolder,
-      useIteratorObject,
+      compilerBehavior,
     });
     emitFlavor(webidl, new Set(knownTypes.Worker), {
       name: "serviceworker",
       global: ["ServiceWorker", "Worker"],
       outputFolder,
-      useIteratorObject,
+      compilerBehavior,
     });
     emitFlavor(webidl, new Set(knownTypes.Worklet), {
       name: "audioworklet",
       global: ["AudioWorklet", "Worklet"],
       outputFolder,
-      useIteratorObject,
+      compilerBehavior,
     });
   }
 

src/build/emitter.ts

@@ -132,11 +132,16 @@ function isEventHandler(p: Browser.Property) {
   return typeof p.eventHandler === "string";
 }
 
+export interface CompilerBehavior {
+  useIteratorObject?: boolean;
+  allowUnrelatedSetterType?: boolean;
+}
+
 export function emitWebIdl(
   webidl: Browser.WebIdl,
   global: string,
   iterator: "" | "sync" | "async",
-  useIteratorObject: boolean,
+  compilerBehavior: CompilerBehavior,
 ): string {
   // Global print target
   const printer = createTextWriter("\n");
@@ -821,17 +826,20 @@ export function emitWebIdl(
         pType += " | undefined";
       }
       const optionalModifier = !p.optional || prefix ? "" : "?";
-      if (!prefix && !p.readonly && p.putForwards) {
+      const canPutForward =
+        compilerBehavior.allowUnrelatedSetterType || !p.readonly;
+      if (!prefix && canPutForward && p.putForwards) {
         printer.printLine(`get ${p.name}${optionalModifier}(): ${pType};`);
 
         const forwardingProperty =
           allInterfacesMap[pType].properties?.property[p.putForwards];
         if (!forwardingProperty) {
           throw new Error("Couldn't find [PutForwards]");
         }
-        const setterType = `${convertDomTypeToTsType(
-          forwardingProperty,
-        )} | ${pType}`;
+        let setterType = `${convertDomTypeToTsType(forwardingProperty)}`;
+        if (!compilerBehavior.allowUnrelatedSetterType) {
+          setterType += ` | ${pType}`;
+        }
         printer.printLine(
           `set ${p.name}${optionalModifier}(${p.putForwards}: ${setterType});`,
         );
@@ -1541,7 +1549,7 @@ export function emitWebIdl(
   }
 
   function emitSelfIterator(i: Browser.Interface) {
-    if (!useIteratorObject) return;
+    if (!compilerBehavior.useIteratorObject) return;
     const async = i.iterator?.async;
     const name = getName(i);
     const iteratorBaseType = `${async ? "Async" : ""}IteratorObject`;
@@ -1569,10 +1577,10 @@ export function emitWebIdl(
     }
     const async = i.iterator?.async;
     const iteratorType = async
-      ? !useIteratorObject
+      ? !compilerBehavior.useIteratorObject
         ? "AsyncIterableIterator"
         : `${name}AsyncIterator`
-      : !useIteratorObject
+      : !compilerBehavior.useIteratorObject
         ? "IterableIterator"
         : subtypes.length !== 1
           ? `${name}Iterator`