TJ Yin
ytj@meta.com
90d · built 2026-05-28
90-day totals
- Commits
- 135
- Grow
- 2.3
- Maintenance
- 10.1
- Fixes
- 0.5
- Total ETV
- 12.9
30-day trajectory
Last 30 days vs. the 30 days before. Up arrows on Growth and ETV mean improvement; up arrow on Fixes share means more time on fixes (worse).
Daily performance
Daily ETV, stacked by Growth, Maintenance and Fixes.
Work-mix over time
Share of Growth / Maintenance / Fixes over a rolling 7-day window. Reads as 'where is effort flowing right now'.
Bug flow over time
Monthly bug flow attributed to this developer. The left bar (red) is bug impact this dev authored that was addressed in the given month — combining bugs others fixed for them and bugs they fixed themselves. The right bar is fixes they personally shipped that month, split between self-fixes (overlap with the red bar) and fixes done for someone else. X-axis is fix-time, not introduction-time — the Navigara API attributes bugs backward to the author at the moment the fix lands.
- Self-fix share
- 46%
- Bugs you introduced
- 2.9
- Bugs you fixed
- 2.6
Repository spread
Where this developer's commits land. Concentrated work (top1 > 80%) vs polymath spread (top1 < 30%).
Most impactful commits
Top 20 by ETV in the 90-day window.
- 4.3ETVMove `thrift/facebook/json5/*` to `thrift/lib/cpp2/protocol` Summary: This diff moved all files under `thrift/facebook/json5 to `thrift/lib/cpp2/protocol`: * `Json5Protocol.h` is moved to `thrift/lib/cpp2/protocol`. Other files are moved to `thrift/lib/cpp2/protocol/detail`. * `thrift/facebook/json5/test` is moved to `thrift/lib/cpp2/protocol/test` * `thrift/facebook/json5/test/example.thrift` is renamed to `json5_test.thrift` Reviewed By: aristidisp Differential Revision: D95818321 fbshipit-source-id: 19d443e93b3a5ea5965b2e62893407874c9634e2github.com-facebook-fbthrift · aadfdb31 · 2026-03-10
- 0.3ETVRemove comparison operators from AnyValue Summary: This diff removed comparison operators (e.g., `operator==`, `operator<`) from AnyValue and AnyRef, since we don't use it in production, let's remove it so that we don't need to maintain the code. Note that after this change, we can't compare two AnyValue directly anymore. Thus for unit-test, we need to cast all AnyValue to the actual type in order to compare. Reviewed By: iahs Differential Revision: D96378660 fbshipit-source-id: 627c375f1303224e476eaca405164f28bd222e2egithub.com-facebook-fbthrift · c6ec39a0 · 2026-03-14
- 0.3ETVMove enum_find from module_types.cpp.h to thrift/lib/cpp2/detail/Enum.h Reviewed By: iahs Differential Revision: D98079473 fbshipit-source-id: c78fc624b4e70e9d8bd5d136797d3fb4f136ef3fgithub.com-facebook-fbthrift · 148f8b59 · 2026-03-25
- 0.3ETVPython support (1): Add main functionalities Summary: Expose Protocol.JSON5 in the Python serializer for deserialize/serialize with unit-tests. Reviewed By: vitaut Differential Revision: D97831965 fbshipit-source-id: 32d5d886d123612affc7c1e0f719e587041daef7github.com-facebook-fbthrift · b908bd22 · 2026-04-10
- 0.3ETVUnify overloaded writeMapBegin Reviewed By: iahs, vitaut Differential Revision: D98774974 fbshipit-source-id: 9ce7f85cfa998544a430b4e8da0011dd1c3e1c61github.com-facebook-fbthrift · d652ec4f · 2026-03-31
- 0.3ETVFix regression introduced by json5 parsing Summary: Same idea as `escapeStringImpl<EnableExtraAsciiEscapes>`: template parameter for compile-time opts so the compiler can constant-fold opts-dependent branches. This diff templated Input on an OptsPtr type. The default-opts path uses `Input<DefaultOptsPtr>`, where `operator*()` returns a value-initialized serialization_opts, so the compiler sees all opts fields are default and folds the branches. The explicit-opts path uses `Input<serialization_opts const*>` as before. Reviewed By: ilvokhin Differential Revision: D100523161 fbshipit-source-id: 064772b69f51022c5af9c788b199285f5ba39916github.com-facebook-folly · 91b80a3d · 2026-04-13
- 0.3ETVPython support (3): Add serialize_json5(object, options) function to allow customizing JsonWriterOptions Summary: - Add serializeJson5 C++ function and expose it through Cython. - Add serialize_json5() and serialize_json5_iobuf() Python functions with a Json5ProtocolWriter::Options class controlling trailing commas, unquoted names, NaN/Infinity handling, and indentation. - Add comprehensive tests for the new APIs including all writer options. Reviewed By: ahilger Differential Revision: D97831963 fbshipit-source-id: 0c6ff1b14f6902079ded2bbedb59b347aba90078github.com-facebook-fbthrift · 17b38c44 · 2026-04-15
- 0.3ETVDefault Json5Reader::readPrimitive precision to Double Summary: When using `Json5Reader::readPrimitive`, it's bit awkward to have Double everywhere when we don't expect the next value to be floating point (e.g., we expect the next value to be integer). This diff make Double to be the default argument, and updated all callsites except `readDouble` in Json5ProtocolReader. Reviewed By: vitaut Differential Revision: D102205967 fbshipit-source-id: 05b297997a523c28f570b64ecdc6c16a91f1b280github.com-facebook-fbthrift · ee77d21c · 2026-04-28
- 0.3ETVImprove Enum related unit-tests Summary: Add MyEnum2I8, MyEnum2U8, MyEnum2I16, MyEnum2U16, MyEnum2U32 enum variants to enum.thrift with different cpp.EnumUnderlyingType annotations. Extract all MyEnum2-related test cases from EnumTestCpp2.cpp into TYPED_TEST so they run against all 6 enum variants (including the original MyEnum2). Reviewed By: iahs Differential Revision: D98407840 fbshipit-source-id: 60c29d681f7efb55dc2c4997735c63cb0bed9b78github.com-facebook-fbthrift · 3baacfc1 · 2026-03-27
- 0.2ETVAdd writeEnum to all protocol writers Summary: This diff added writeEnum method to all protocol writers that just forward the function call to `writeI32` (besides Json5ProtocolWriter) Reviewed By: iahs Differential Revision: D95345802 fbshipit-source-id: 3998963c15c2fa19e0791c97ebe763e6596df564github.com-facebook-fbthrift · 5d1bec47 · 2026-03-13
- 0.2ETVMove some test cases from C++ to thrift constant Summary: 1. Moved test cases from JsonDecoderNegativeTest.cpp to json5_negative_test.thrift 2. Moved test cases from JsonDecoderCompatibilityTest.cpp to json5_compatibility_test.thrift So that we can share them with python Reviewed By: hchokshi Differential Revision: D96370596 fbshipit-source-id: 8286399a494431b614d81114ebde300c1043118cgithub.com-facebook-fbthrift · cb859ab7 · 2026-03-17
- 0.2ETVImplement type_class to type tag conversion Reviewed By: iahs Differential Revision: D98672494 fbshipit-source-id: 284bb187e8a084fcb3d1ede5ea85a2a65d2eb3c5github.com-facebook-fbthrift · f8e53705 · 2026-03-30
- 0.2ETVMigrate kSortKeys to return KeyOrder enum Summary: This diff replaced `static bool kSortKeys()` in protocol writer with `static KeyOrder keyOrder()`, where KeyOrder is defiend as ``` /// How to sort keys in set/map during serialization. enum class KeyOrder { /// No sorting applied. Unspecified, /// Sorted by C++ `operator<`, in ascending order. NativeAscending, }; ``` The motivation is that JSON5 uses a different ordering other than simplying sorting keys by `operator<` in set/map. In the next diff, we will introduce `KeyOrder::ObjectModelAscending` for such ordering. Reviewed By: iahs Differential Revision: D96176829 fbshipit-source-id: 68d30606bc783625289f06cd6fd033304ea02e6fgithub.com-facebook-fbthrift · f3bee6bc · 2026-03-13
- 0.2ETVMigrate folly::ordering to std::weak_ordering in Compare.h Reviewed By: iahs Differential Revision: D96346532 fbshipit-source-id: 8d530622c9832104ee6a23103fee362548ae9d4egithub.com-facebook-fbthrift · 3ed18e47 · 2026-03-19
- 0.2ETVAdd mapPrimitiveKeysAsMemberNames option to Json5ProtocolWriter Summary: Add `mapPrimitiveKeysAsMemberNames` option to `Json5ProtocolWriter::Options`. When set, maps with primitive key types (bool, integers, float, double, string) use JSON object form with stringified keys; non-primitive keys still use key-value array form. The motivation is having options to make JSON5 protocol output similar to SimpleJSON for easier migraiton. Reviewed By: vitaut Differential Revision: D103640895 fbshipit-source-id: fe1c32b872903a7adf610f3affd69ca2186b4a50github.com-facebook-fbthrift · 663284db · 2026-05-06
- 0.2ETVRemove RE2 dependencies from thrift/lib/cpp2/protocol/detail Summary: Replace RE2 regex usage in Json5ProtocolReader.cpp and JsonWriter.cpp with pure C++ equivalents using std::from_chars, std::all_of, and folly::rtrimWhitespace. This eliminates the third-party RE2 dependency from the Json5ProtocolReader and JsonWriter build targets. Reviewed By: vitaut Differential Revision: D103328261 fbshipit-source-id: cdf7921e55fd6832eda692d5cc4bbd9ef3975f00github.com-facebook-fbthrift · b2c12d14 · 2026-05-09
- 0.2ETVAdd op::for_each_field_id_ascending API Summary: Introduce for_each_field_id_ascending function that iterates struct fields in ascending field ID order (1, 2, 3, ...) rather than declaration order. Motivation: This will used for json5 serialization in D94950111, where we want to have options to control field serialization order. Reviewed By: hchokshi Differential Revision: D94950110 fbshipit-source-id: a31d4c16d64fbae7c3aadc015112a9c264764f38github.com-facebook-fbthrift · 77fc882a · 2026-03-03
- 0.2ETVAdd the ability to parse field name as "field-name (field-id)" (2): implementation Summary: With this diff, fields can now be specified as: - `"fieldName"` — lookup by name (existing behavior) - `"fieldName (id)"` — lookup by name with ID validation - `"(id)"` — lookup by field ID only - `"id"` — lookup by field ID only (bare integer string) This diff improved the mechanism used in SimpleJSONProtocol to convert "field-name" --> "field-id". Here is how it works today for SimpleJSONProtocol (1) We invoke `readFieldBegin(name, id, type)` to get field name (id will be `numeric_limits<int16_t>::min()`). (2) Use the following code to translate name --> id https://www.internalfb.com/code/fbsource/[c4e6c5b82e65bfcaa2b5e550728a3fd581b67ecf]/xplat/thrift/compiler/test/fixtures/basic/out/cpp2/gen-cpp2/module_types_custom_protocol.h?lines=239-241 which will invoke https://www.internalfb.com/code/fbsource/[c4e6c5b82e65bfcaa2b5e550728a3fd581b67ecf]/xplat/thrift/compiler/test/fixtures/basic/out/cpp2/gen-cpp2/module_types_serialization.cpp?lines=27 to actually translate field name to field id and type. ## Core changes This diff changed `translate_field_name` so that 1. In Json5ProtocolReader, the `readFieldBegin(name, id, type)` will now parse and set field-name and field-id. 2. In `translate_field_name` the logic changed to the following 2.1 If `name` is empty, translate field-id to field-type instead. 2.2 If both `name` and `id` are set, validate whether `id` matches schema, and throw exception on any mismatches. 2.3 If only `name` is set, the behavior is unchanged. 3. TableBasedSerializer is modified accordingly. # How do we know whether `id` is set if the type is just `std::int16_t`? We use `id != numeric_limits<int16_t>::min()` to determine whether id is set. Note: even though field id "-32768" might be valid for binary/compact protocol for lazy deserialization (https://fburl.com/code/tuve65w9), it will not be valid for other protocols as long as they don't support lazy deserialization: https://www.internalfb.com/code/fbsource/[2ccab6a0d0f391fe2b58e0d2535c372370cbb058]/fbcode/thrift/lib/cpp2/protocol/SimpleJSONProtocol.h?lines=54 In the unlikely event if we want to add lazy deserialization support to JSON protocol, we can just pick another sentry number and use it. Reviewed By: iahs Differential Revision: D100232165 fbshipit-source-id: 1b975bc1756c0dd3eeb78d74a55a34d335e66ec1github.com-facebook-fbthrift · 39042148 · 2026-04-16
- 0.2ETVAdd ThriftObjectModelLessThan Reviewed By: vitaut Differential Revision: D95846368 fbshipit-source-id: 93c82e384bb3619b51640700c7c336ec077681bfgithub.com-facebook-fbthrift · a5916ae9 · 2026-03-12
- 0.2ETVRename container patch single-element methods Summary: Rename container patch methods to make them more consistent and intuitive: | Current method name in C++ | New name | | --- | --- | | ListPatch::push_back | append | | ListPatch::appendMulti | appendMulti (unchanged) | | SetPatch::insert | add | | SetPatch::addMulti | addMulti (unchanged) | | SetPatch::erase | remove | | SetPatch::removeMulti | removeMulti (unchanged) | | MapPatch::insert_or_assign | put | | MapPatch::putMulti | putMulti (unchanged) | | N/A (no method to try_insert a single key-value) | tryPut | | MapPatch::tryPutMulti | tryPutMulti (unchanged) | | MapPatch::erase | remove | | MapPatch::removeMulti | removeMulti (unchanged) | Old method names are kept as deprecated aliases for backward compatibility. ___ overriding_review_checks_triggers_an_audit_and_retroactive_review Oncall Short Name: thrift_qna Differential Revision: D100479718 fbshipit-source-id: 74057188b1342175f4acaaf4eee3bff326fab2dfgithub.com-facebook-fbthrift · a5a24c39 · 2026-04-13