feat(emitter): support differing accessor types (#996)

Author: saschanaz

baselines/dom.generated.d.ts

@@ -4538,7 +4538,8 @@ interface Document extends Node, DocumentAndElementEventHandlers, DocumentOrShad
     /**
      * Contains information about the current URL.
      */
-    location: Location;
+    get location(): Location;
+    set location(href: string | Location);
     onfullscreenchange: ((this: Document, ev: Event) => any) | null;
     onfullscreenerror: ((this: Document, ev: Event) => any) | null;
     onpointerlockchange: ((this: Document, ev: Event) => any) | null;
@@ -18225,7 +18226,8 @@ interface Window extends EventTarget, AnimationFrameProvider, GlobalEventHandler
     readonly innerHeight: number;
     readonly innerWidth: number;
     readonly length: number;
-    location: Location;
+    get location(): Location;
+    set location(href: string | Location);
     readonly locationbar: BarProp;
     readonly menubar: BarProp;
     readonly msContentScript: ExtensionScriptApis;

package.json

@@ -34,7 +34,7 @@
     "prettier": "^2.2.1",
     "print-diff": "^1.0.0",
     "styleless-innertext": "^1.1.2",
-    "typescript": "^4.2.3",
-    "webidl2": "^23.13.0"
+    "typescript": "^4.3.0-dev.20210327",
+    "webidl2": "^23.13.1"
   }
 }

src/emitter.ts

@@ -882,11 +882,27 @@ export function emitWebIdl(
       if (!required && prefix) {
         pType += " | undefined";
       }
-      const readOnlyModifier =
-        p["read-only"] === 1 && prefix === "" ? "readonly " : "";
-      printer.printLine(
-        `${prefix}${readOnlyModifier}${p.name}${requiredModifier}: ${pType};`
-      );
+      if (!prefix && !p["read-only"] && p["put-forwards"]) {
+        printer.printLine(`get ${p.name}${requiredModifier}(): ${pType};`);
+
+        const forwardingProperty =
+          allInterfacesMap[pType].properties?.property[p["put-forwards"]];
+        if (!forwardingProperty) {
+          throw new Error("Couldn't find [PutForwards]");
+        }
+        const setterType = `${convertDomTypeToTsType(
+          forwardingProperty
+        )} | ${pType}`;
+        printer.printLine(
+          `set ${p.name}${requiredModifier}(${p["put-forwards"]}: ${setterType});`
+        );
+      } else {
+        const readOnlyModifier =
+          p["read-only"] === 1 && prefix === "" ? "readonly " : "";
+        printer.printLine(
+          `${prefix}${readOnlyModifier}${p.name}${requiredModifier}: ${pType};`
+        );
+      }
     }
 
     if (p.stringifier) {

src/widlprocess.ts

@@ -357,6 +357,7 @@ function convertAttribute(
     exposed:
       getExtAttrConcatenated(attribute.extAttrs, "Exposed") ||
       inheritedExposure,
+    "put-forwards": getExtAttr(attribute.extAttrs, "PutForwards")[0],
   };
 }