Sort destructured arguments by source position (mozilla#128)

This is a repeat of mozilla#101 which we dropped when rewriting in typescript. This
time I added a test.

sphinx_js/js/convertTopLevel.ts

@@ -684,6 +684,20 @@ export class Converter {
     }
     const decl = type.declaration;
     const children = decl.children!;
+    // Sort destructured parameter by order in the type declaration in the
+    // source file. Before we sort they are in alphabetical order by name. Maybe
+    // we should have a way to pick the desired behavior? There are three
+    // reasonable orders:
+    //
+    // 1. alphabetical by name
+    // 2. In order of the @options.b annotations
+    // 3. In order of their declarations in the type
+    //
+    // This does order 3
+    children.sort(
+      ({ sources: a }, { sources: b }) =>
+        a![0].line - b![0].line || a![0].character - b![0].character,
+    );
     const result: ParamReflSubset[] = [];
     for (const child of children) {
       result.push({

tests/test_typedoc_analysis/source/types.ts

@@ -146,7 +146,7 @@ export function codeInDescription() {}
  * @param options.b - The 'b' string.
  * @destructure options
  */
-export function destructureTest({ a, b }: { a: string; b: { c: string } }) {}
+export function destructureTest({ a, b }: { b: { c: string }; a: string }) {}
 
 /**
  * An example with destructured args 2
@@ -158,14 +158,14 @@ export function destructureTest2({
   a,
   b,
 }: {
-  /**  The 'a' string. */
-  a: string;
   /** The 'b' object. */
   b: { c: string };
+  /**  The 'a' string. */
+  a: string;
 }) {}
 
 /**
- * An example with destructured args 3
+ * An example with no destructured args 3
  *
  * @param options - The options.
  * @param options.a - The 'a' string.

tests/test_typedoc_analysis/test_typedoc_analysis.py

@@ -569,22 +569,27 @@ def test_code_in_description(self):
 
     def test_destructured(self):
         obj = self.analyzer.get_object(["destructureTest"])
-        assert obj.params[0].name == "options.a"
-        assert join_type(obj.params[0].type) == "string"
-        assert obj.params[0].description == [DescriptionText(text="The 'a' string.")]
-        assert obj.params[1].name == "options.b"
-        assert join_type(obj.params[1].type) == "{ c: string; }"
-        assert obj.params[1].description == [DescriptionText(text="The 'b' string.")]
+        # Parameters should be sorted by source position in the type annotation not by name.
+        assert obj.params[0].name == "options.b"
+        assert join_type(obj.params[0].type) == "{ c: string; }"
+        assert obj.params[0].description == [DescriptionText(text="The 'b' string.")]
+        assert obj.params[1].name == "options.a"
+        assert join_type(obj.params[1].type) == "string"
+        assert obj.params[1].description == [DescriptionText(text="The 'a' string.")]
+
         obj = self.analyzer.get_object(["destructureTest2"])
-        assert obj.params[0].name == "options.a"
-        assert join_type(obj.params[0].type) == "string"
-        assert obj.params[0].description == [DescriptionText(text="The 'a' string.")]
-        assert obj.params[1].name == "options.b"
-        assert join_type(obj.params[1].type) == "{ c: string; }"
-        assert obj.params[1].description == [DescriptionText(text="The 'b' object.")]
+        assert obj.params[0].name == "options.b"
+        assert join_type(obj.params[0].type) == "{ c: string; }"
+        assert obj.params[0].description == [DescriptionText(text="The 'b' object.")]
+
+        assert obj.params[1].name == "options.a"
+        assert join_type(obj.params[1].type) == "string"
+        assert obj.params[1].description == [DescriptionText(text="The 'a' string.")]
+
         obj = self.analyzer.get_object(["destructureTest3"])
         assert obj.params[0].name == "options"
         assert join_type(obj.params[0].type) == "{ a: string; b: { c: string; }; }"
+
         obj = self.analyzer.get_object(["destructureTest4"])
         assert obj.params[0].name == "destructureThisPlease.a"
         assert join_type(obj.params[0].type) == "string"