Support property names for directive arg defaults

src/Extractor.ts

@@ -1753,12 +1753,13 @@ class Extractor {
   collectArgDefaults(node: ts.ObjectBindingPattern): ArgDefaults {
     const defaults = new Map();
     for (const element of node.elements) {
+      const name = element.propertyName ?? element.name;
       if (
         ts.isBindingElement(element) &&
         element.initializer &&
-        ts.isIdentifier(element.name)
+        ts.isIdentifier(name)
       ) {
-        defaults.set(element.name.text, element.initializer);
+        defaults.set(name.text, element.initializer);
       }
     }
     return defaults;

src/tests/fixtures/default_values/DefaultArgumentPropertyName.ts

@@ -0,0 +1,7 @@
+/** @gqlType */
+export default class SomeType {
+  /** @gqlField */
+  hello({ if: x = false }: { if: boolean }): string {
+    return x ? "hello" : "world";
+  }
+}

src/tests/fixtures/default_values/DefaultArgumentPropertyName.ts.expected

@@ -0,0 +1,42 @@
+-----------------
+INPUT
+----------------- 
+/** @gqlType */
+export default class SomeType {
+  /** @gqlField */
+  hello({ if: x = false }: { if: boolean }): string {
+    return x ? "hello" : "world";
+  }
+}
+
+-----------------
+OUTPUT
+-----------------
+-- SDL --
+type SomeType {
+  hello(if: Boolean! = false): String
+}
+-- TypeScript --
+import { GraphQLSchema, GraphQLObjectType, GraphQLString, GraphQLNonNull, GraphQLBoolean } from "graphql";
+export function getSchema(): GraphQLSchema {
+    const SomeTypeType: GraphQLObjectType = new GraphQLObjectType({
+        name: "SomeType",
+        fields() {
+            return {
+                hello: {
+                    name: "hello",
+                    type: GraphQLString,
+                    args: {
+                        if: {
+                            type: new GraphQLNonNull(GraphQLBoolean),
+                            defaultValue: false
+                        }
+                    }
+                }
+            };
+        }
+    });
+    return new GraphQLSchema({
+        types: [SomeTypeType]
+    });
+}

src/tests/fixtures/directives/directiveArgumentNameIsStringLiteralWithDefault.ts

@@ -0,0 +1,12 @@
+// https://github.com/captbaritone/grats/issues/166#issuecomment-2753130827
+
+/**
+ * @gqlDirective on FRAGMENT_SPREAD | INLINE_FRAGMENT
+ */
+function defer({
+  label,
+  if: _ = true, // anonymous alias
+}: {
+  label: string;
+  if?: boolean | null;
+}): void {}

src/tests/fixtures/directives/directiveArgumentNameIsStringLiteralWithDefault.ts.expected

@@ -0,0 +1,41 @@
+-----------------
+INPUT
+----------------- 
+// https://github.com/captbaritone/grats/issues/166#issuecomment-2753130827
+
+/**
+ * @gqlDirective on FRAGMENT_SPREAD | INLINE_FRAGMENT
+ */
+function defer({
+  label,
+  if: _ = true, // anonymous alias
+}: {
+  label: string;
+  if?: boolean | null;
+}): void {}
+
+-----------------
+OUTPUT
+-----------------
+-- SDL --
+directive @defer(label: String!, if: Boolean = true) on FRAGMENT_SPREAD | INLINE_FRAGMENT
+-- TypeScript --
+import { GraphQLSchema, GraphQLDirective, DirectiveLocation, GraphQLNonNull, GraphQLString, GraphQLBoolean } from "graphql";
+export function getSchema(): GraphQLSchema {
+    return new GraphQLSchema({
+        directives: [new GraphQLDirective({
+                name: "defer",
+                locations: [DirectiveLocation.FRAGMENT_SPREAD, DirectiveLocation.INLINE_FRAGMENT],
+                args: {
+                    label: {
+                        type: new GraphQLNonNull(GraphQLString)
+                    },
+                    if: {
+                        type: GraphQLBoolean,
+                        defaultValue: true
+                    }
+                }
+            })],
+        types: []
+    });
+}