feat(48743): allow autocompletion in parameter object destructuring in JavaScript (#48757)

Author: a-tarasyuk

src/services/completions.ts

@@ -3062,7 +3062,7 @@ namespace ts.Completions {
                 // through type declaration or inference.
                 // Also proceed if rootDeclaration is a parameter and if its containing function expression/arrow function is contextually typed -
                 // type of parameter will flow in from the contextual type of the function
-                let canGetType = hasInitializer(rootDeclaration) || hasType(rootDeclaration) || rootDeclaration.parent.parent.kind === SyntaxKind.ForOfStatement;
+                let canGetType = hasInitializer(rootDeclaration) || !!getEffectiveTypeAnnotationNode(rootDeclaration) || rootDeclaration.parent.parent.kind === SyntaxKind.ForOfStatement;
                 if (!canGetType && rootDeclaration.kind === SyntaxKind.Parameter) {
                     if (isExpression(rootDeclaration.parent)) {
                         canGetType = !!typeChecker.getContextualType(rootDeclaration.parent as Expression);

tests/cases/fourslash/completionListInObjectBindingPattern16.ts

@@ -0,0 +1,18 @@
+/// <reference path="fourslash.ts" />
+
+// @allowJs: true
+// @checkJs: true
+
+// @filename: a.js
+/////**
+//// * @typedef Foo
+//// * @property {number} a
+//// * @property {string} b
+//// */
+////
+/////**
+//// * @param {Foo} options
+//// */
+////function f({ /**/ }) {}
+
+verify.completions({ marker: "", exact: ["a", "b"] });