Merge pull request #24136 from Microsoft/inferFromUsageFixes

Remove assert in `symbolToParameterDeclaration`

Author: mhegazy

src/compiler/checker.ts

@@ -3607,7 +3607,7 @@ namespace ts {
 
             function symbolToParameterDeclaration(parameterSymbol: Symbol, context: NodeBuilderContext, preserveModifierFlags?: boolean): ParameterDeclaration {
                 const parameterDeclaration = getDeclarationOfKind<ParameterDeclaration>(parameterSymbol, SyntaxKind.Parameter);
-                Debug.assert(!!parameterDeclaration || isTransientSymbol(parameterSymbol) && !!parameterSymbol.isRestParameter);
+                Debug.assert(!!parameterDeclaration || isTransientSymbol(parameterSymbol));
 
                 let parameterType = getTypeOfSymbol(parameterSymbol);
                 if (parameterDeclaration && isRequiredInitializedParameter(parameterDeclaration)) {
@@ -3616,7 +3616,8 @@ namespace ts {
                 const parameterTypeNode = typeToTypeNodeHelper(parameterType, context);
 
                 const modifiers = !(context.flags & NodeBuilderFlags.OmitParameterModifiers) && preserveModifierFlags && parameterDeclaration && parameterDeclaration.modifiers && parameterDeclaration.modifiers.map(getSynthesizedClone);
-                const dotDotDotToken = !parameterDeclaration || isRestParameter(parameterDeclaration) ? createToken(SyntaxKind.DotDotDotToken) : undefined;
+                const isRest = parameterDeclaration ? isRestParameter(parameterDeclaration) : (parameterSymbol as TransientSymbol).isRestParameter;
+                const dotDotDotToken = isRest ? createToken(SyntaxKind.DotDotDotToken) : undefined;
                 const name = parameterDeclaration
                     ? parameterDeclaration.name ?
                         parameterDeclaration.name.kind === SyntaxKind.Identifier ?

tests/cases/fourslash/codeFixInferFromUsageJSXElement.ts

@@ -0,0 +1,40 @@
+/// <reference path='fourslash.ts' />
+
+// @noImplicitAny: true
+// @jsx: react
+// @module: es2015
+// @moduleResolution: node
+
+// @Filename: /node_modules/@types/react/index.d.ts
+////export = React;
+////export as namespace React;
+////declare namespace React {
+////    export class Component { render(): JSX.Element | null; }
+////}
+////declare global {
+////    namespace JSX {
+////        interface Element {}
+////    }
+////}
+
+
+// @filename: a.tsx
+//// import React from 'react';
+////
+//// export default function Component([|props |]) {
+////     if (props.isLoading) {
+////         return <div>...Loading < /div>;
+////     }
+////     else {
+////         return <AnotherComponent
+////             update={
+////             (rec) => {
+////                 return props.update(rec);
+////             }
+////         }
+////         />;
+////     }
+//// }
+
+
+verify.rangeAfterCodeFix("props: { isLoading: any; update: (arg0: any) => void; }",/*includeWhiteSpace*/ undefined, /*errorCode*/ undefined, 0);