Implement `toMatchSnapshot()` (#2294)

* buggy snapshot

* error output for failed snapshot

* missing first

* hints

* open dir once, better cleanup

* update flag

* truncate on update

* object and class snapshot formatting

* array formatting

* no function name, single item is empty array

* string objects, maps, sets, promise

* avoid using invalid memory

* handle number objects

* handle extending `Number`

* boolean objects

* snapshot tests and test updates

* snapshot format for buffers

* safer snapshot parsing

* property matchers setup

* strings and tests

* generate classes with empty prototype

* optional `propertyMatchers` parameter

* new test folder structure

* strings.eqlLong

* globalObject.throwPretty() and expect.any tests

* add updateSnapshot flag to help

* move snapshot format out of `printErrorlikeObject`

* empty object snapshot format

* separate typed array, remove trailing comma

* use `isCell`, object trailing commas

* handle unicode

* todo for primitive constructors

* switch to `JSC.Node.Syscall.open` and `JSC.Maybe`

* use js parser for snapshot files

* deinit ast, log parse error

* copy/paste most of `exports.ZigConsoleClient`

* remove snapshot option

* remove ordered properties option

* remove snapshot format option from `exports.zig`

* remove extra newlines

* change mode

* update test runner output

* escape backticks faster

* `bunx jest` in temp dir

* remove buffered writer

* add `toMatchSnapshot` to types

* cleanup, switch to `pread`

* cli `--update` flag

* `--update-snapshots`

* remove string object format

1 files changed, 8 insertions, 6 deletions

diff --git a/src/bun.js/scripts/generate-classes.ts b/src/bun.js/scripts/generate-classes.ts
index d39ea027b..f13132f8f 100644
--- a/src/bun.js/scripts/generate-classes.ts
+++ b/src/bun.js/scripts/generate-classes.ts
@@ -292,9 +292,7 @@ export function generateHashTable(nameToUse, symbolName, typeName, obj, props =
   //     { "CLOSED"_s, JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { HashTableValue::ConstantType, 3 } },
   // };
   return `
-  static const HashTableValue ${nameToUse}TableValues[] = {
-${rows.join("  ,\n")}
-  };
+  static const HashTableValue ${nameToUse}TableValues[] = {${rows.length > 0 ? "\n" + rows.join("  ,\n") + "\n" : ""}};
 `;
 }
 
@@ -348,7 +346,11 @@ ${renderFieldsImpl(protoSymbolName, typeName, obj, protoFields, obj.values || []
 void ${proto}::finishCreation(JSC::VM& vm, JSC::JSGlobalObject* globalObject)
 {
     Base::finishCreation(vm);
-    reifyStaticProperties(vm, ${className(typeName)}::info(), ${proto}TableValues, *this);${specialSymbols}
+    ${
+      Object.keys(protoFields).length > 0
+        ? `reifyStaticProperties(vm, ${className(typeName)}::info(), ${proto}TableValues, *this);`
+        : ""
+    }${specialSymbols}
     JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
 }
 
@@ -1144,9 +1146,9 @@ function generateImpl(typeName, obj) {
   return [
     generatePrototypeHeader(typeName),
     !obj.noConstructor ? generateConstructorHeader(typeName).trim() + "\n" : null,
-    Object.keys(proto).length > 0 && generatePrototype(typeName, obj).trim(),
+    generatePrototype(typeName, obj).trim(),
     !obj.noConstructor ? generateConstructorImpl(typeName, obj).trim() : null,
-    Object.keys(proto).length > 0 && generateClassImpl(typeName, obj).trim(),
+    generateClassImpl(typeName, obj).trim(),
   ]
     .filter(Boolean)
     .join("\n\n");