Roadmap

This is a living document containing ChakraCore team's current priorities as well as release notes for previous releases. Future roadmap last updated 2/26/18.

All the changes done in the public repository flow into Chakra and Microsoft Edge on a regular basis as described in the Contribution guidelines.

(Scroll to Release Notes)

Future

The following is a summary of the ChakraCore team's backlog for the next 6 months. Some completed items (either in a release or master branch) are included to provide the context and progress of the work.

Language Innovation & Standards

• Complete module implementation (ES6)
• Complete Shared Memory and Atomics implementation
• Migrate JS Intl APIs to use ICU/CLDR on Windows
• ES2018+ features
  • Implement promise.prototype.finally
  • Implement async generators & iterators
  • Implement object rest and spread
  • Implement new RegEx APIs
  • Implement new Intl APIs
• WebAssembly
  • Enable WebAssembly MVP on by default
  • Enable post-MVP WebAssembly features

Performance - Staying Fast and Lean

• Optimize Object.assign/create
• Optimize JSON.stringify/parse
• Optimize ES6 for..of
  • Enable inlining for try/catch/finally
• Improve performance for real-world sites
• Improve performance for ES2015+ features
• Reduce script parsing time
• Reduce GC fragmentation
• More type sharing

Enhancing Host & Platform Support

• Node.js

  • Enable Node-ChakraCore on Mac and Linux.
  • Support Chrome Debug Protocol in Node-ChakraCore.
  • Enable Time Travel Debugging over Chrome Debug Protocol using VSCode
  • Support N-API
  • Maintain Node-ChakraCore releases
  • Improve Node-ChakraCore performance based on benchmarks and real-world scenarios

• Embedding

  • Provide better debugging experience for ChakraCore embedders
    • Factor CrDP debugging shim in NodeChakraCore as a library to help enable debugging in applications embedding ChakraCore
  • Enable profiling

Engineering Improvements

• Enable easier authoring of JavaScript built-ins in JavaScript.

Release Notes

ChakraCore 1.11

v1.11.24

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-17131 #6531

v1.11.23

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-17054, CVE-2020-17048 #6528

v1.11.22

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-0878, CVE-2020-1057, CVE-2020-1172, CVE-2020-1180 #6500

v1.11.21

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-1555 #6491

v1.11.20

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-1073, CVE-2020-1219 #6464

v1.11.19

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-1037, CVE-2020-1065 #6447

v1.11.18

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-0970, CVE-2020-0969 #6420

v1.11.17

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-0768, CVE-2020-0811, CVE-2020-0812, CVE-2020-0813, CVE-2020-0823, CVE-2020-0825, CVE-2020-0826, CVE-2020-0827, CVE-2020-0828, CVE-2020-0829, CVE-2020-0830, CVE-2020-0831, CVE-2020-0848 #6386

v1.11.16

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2020-0710, CVE-2020-0711, CVE-2020-0712, CVE-2020-0713, CVE-2020-0767 #6375

v1.11.15

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-1426, CVE-2019-1427, CVE-2019-1428 #6328

v1.11.14

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE--2019-1307, CVE-2019-1308, CVE-2019-1335, CVE-2019-1366 #6302

v1.11.13

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-1138, CVE-2019-1217, CVE-2019-1237, CVE-2019-1298, CVE-2019-1300 #6279

v1.11.12

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-1197, CVE-2019-1141, CVE-2019-1196, CVE-2019-1139, CVE-2019-1131, CVE-2019-1195 #6243

v1.11.11

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-1001, CVE-2019-1062, CVE-2019-1092, CVE-2019-1103, CVE-2019-1106, CVE-2019-1107 #6196

v1.11.10

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-0989 CVE-2019-0990, CVE-2019-0991, CVE-2019-0992, CVE-2019-0993, CVE-2019-1003, CVE-2019-1023, CVE-2019-1024, CVE-2019-1051, CVE-2019-1052 #6155

v1.11.9

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-0911, CVE-2019-0912, CVE-2019-0913, CVE-2019-0914, CVE-2019-0915, CVE-2019-0916, CVE-2019-0917, CVE-2019-0922, CVE-2019-0923, CVE-2019-0924, CVE-2019-0925, CVE-2019-0927, CVE-2019-0933, CVE-2019-0937 #6122

v1.11.8

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-0739, CVE-2019-0806, CVE-2019-0810, CVE-2019-0812, CVE-2019-0829, CVE-2019-0860, CVE-2019-0861 #6087

v1.11.7

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-0592, CVE-2019-0609, CVE-2019-0611, CVE-2019-0639, CVE-2019-0746, CVE-2019-0769, CVE-2019-0773, CVE-2019-0771 #6016

v1.11.6

This patch release of ChakraCore 1.11 includes the following security fixes:

Security

• Changes to address CVE-2019-0590, CVE-2019-0591, CVE-2019-0593, CVE-2019-0605, CVE-2019-0607, CVE-2019-0610, CVE-2019-0640, CVE-2019-0642, CVE-2019-0644, CVE-2019-0648, CVE-2019-0649, CVE-2019-0651, CVE-2019-0652, CVE-2019-0655, CVE-2019-0658 #5936 #5940

v1.11.5

This patch release of ChakraCore 1.11 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2019-0539, CVE-2019-0567, CVE-2018-0568 #5899

v1.11.4

This patch release of ChakraCore 1.11 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8583, CVE-2018-8624, CVE-2018-8618, CVE-2018-8629, CVE-2018-8617 #5869

v1.11.3

This patch release of ChakraCore 1.11 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8541, CVE-2018-8542, CVE-2018-8543, CVE-2018-8551, CVE-2018-8555, CVE-2018-8556, CVE-2018-8557 and CVE-2018-8588 #5827

v1.11.2

This patch release of ChakraCore 1.11 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8473, CVE-2018-8500, CVE-2018-8503, CVE-2018-8505, CVE-2018-8510, CVE-2018-8511, and CVE-2018-8513 #5764

v1.11.1

This patch release of ChakraCore 1.11 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8315, CVE-2018-8354, CVE-2018-8367, CVE-2018-8452, CVE-2018-8456, CVE-2018-8459, CVE-2018-8465, CVE-2018-8466 and CVE-2018-8467 #5688

v1.11.0

ChakraCore 1.11.0 includes bug fixes, including a reliability fix relating to ETW tracing #5632

ChakraCore 1.10

v1.10.2

This patch release of ChakraCore 1.10 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8380, CVE-2018-8359, CVE-2018-8385, CVE-2018-8390, CVE-2018-8266, CVE-2018-8384, CVE-2018-8372, CVE-2018-8355 and CVE-2018-8381 #5596

v1.10.1

This patch release of ChakraCore 1.10 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8275, CVE-2018-8276, CVE-2018-8279, CVE-2018-8280, CVE-2018-8283, CVE-2018-8286, CVE-2018-8287, CVE-2018-8288, CVE-2018-8290, CVE-2018-8291, CVE-2018-8294, CVE-2018-8298 #5444

v1.10.0

ChakraCore 1.10.0 includes more JavaScript and WebAssembly feature updates, performance enhancements, and JSRT APIs. See notable changes below.

Also shout-out to @rhuanjl, @fatcerberus, OSS-Fuzz, and Google Project Zero for their contributions during this release!

Language

• Improved support for Intl/ICU (see use ICU on Windows)
• Implement Intl.NumberFormat.prototype.formatToParts #5105
• Implement Intl.PluralRules #4940
• Implement Promise.prototype.finally #3520
• Demote Dynamic Import support to behind a flag f7bcf68cf

WebAssembly

• Enable sign extension operators on by default #5136
• Implement non-trapping float to int conversions #5129 #5014
• Implement atomic load/store #4470
• Implement WebAssembly SIMD support behind experimental flag #4200
• Implement WebAssembly Shared Memory (only available with SharedArrayBuffer on) #4762

Performance

• Improved type-sharing for objects with getters/setters #4283 and for function objects #4748 #4818
• Enable inlining for callback functions #5081
• Improved performance for Array.prototype.filter #5137, Object.assign #4852 #4817, Map/Set #4816, and JSON.Stringify #4907 #4831
• Improved optimizations for property access in loops #5110
• Optimizations to minimize performance impact from Spectre mitigations

JSRT

• Add JsGetPromiseState and JsGetPromiseResult #5138 #5131
• Add JsGetProxyProperties #4806
• Add JsRuntimeAttributeDisableExecutablePageAllocation attribute #4797
• Add JsGetModuleNamespace #4707
• Add JsSetHostPromiseRejectionTracker to process unhandled promise rejections #4608
• Add JsCreateEnhancedFunction for native callbacks with new.target #4529
• Add JsCreateExternalObjectWithPrototype #4267
• Add Symbol support in JsObject[Has/Get/Set/....] APIs #4209

Diagnostics

• Enable support for ETW events on xplat via LTTng #4314

ChakraCore 1.8

v1.8.5

This patch release of ChakraCore 1.8 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-8227, CVE-2018-8229 and CVE-2018-8236 #5298

v1.8.4

This patch release of ChakraCore 1.8 includes security fixes, performance improvements, and bugfixes.

Security

• Changes to address CVE-2018-0954, CVE-2018-1022, CVE-2018-8133, CVE-2018-0943, CVE-2018-0953, CVE-2018-8130, CVE-2018-0946, CVE-2018-8177, CVE-2018-8128, CVE-2018-8178, CVE-2018-8137, CVE-2018-8139, CVE-2018-0945 and Spectre #5116

v1.8.3

This patch release of ChakraCore 1.8 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2018-0980, CVE-2018-1019, CVE-2018-0995, CVE-2018-0993, CVE-2018-0979, CVE-2018-0990 and CVE-2018-0994 #4963

v1.8.2

This patch release of ChakraCore 1.8 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2018-0930, CVE-2018-0891, CVE-2018-0873, CVE-2018-0874, CVE-2018-0937, CVE-2018-0872, CVE-2018-0936, CVE-2018-0939, CVE-2018-0876, CVE-2018-0931, CVE-2018-0934, CVE-2018-0933, and an ACG bypass #4812

v1.8.1

This patch release of ChakraCore 1.8 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2018-0857, CVE-2018-0860, CVE-2018-0859, CVE-2018-0840, CVE-2018-0834, CVE-2018-0837, CVE-2018-0838, CVE-2018-0856, CVE-2018-0836, CVE-2018-0835, CVE-2018-0866, CVE-2018-0858, and Spectre #4676

v1.8.0

ChakraCore 1.8.0 includes more JavaScript and WebAssembly feature updates and performance enhancements. See notable changes below.

• #3855 Removed support for building with VS2013
• Several improvements to regex performance
• Performance improvements to Object.assign, Object.create and Object.hasOwnProperty
• Adding support for Arm64
• #3553 Experimental: Introduce "lite" ChakraCore build
• #3594 Byte code size and serialized byte code size optimizations (15-20% serialized byte code size reduction)
• #3681 add inlining support for asm.js/wasm
• #3832 Enable inlining into functions which have try-catch/try-finally
• #3846 Add support for a Recycler-managed "Host Heap" to facilitate tracing of objects which relate to scriptable types
• #3931 Add JSRT API JsLessThan
• #4077 Optimized JSON.stringify and JSON.parse
• #4118 Share types (i.e., allow PathTypeHandlers) for properties with non-standard attributes (non-writable, etc.).
• #3875 jsrt: added JsObject Delete/Get/Has/OwnP../Set Property methods
• #4531 Fix and enable wasm on xplat

ChakraCore 1.7

v1.7.6

This patch release of ChakraCore 1.7 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2018-0758, CVE-2018-0762, CVE-2018-0767, CVE-2018-0768, CVE-2018-0769, CVE-2018-0770, CVE-2018-0772, CVE-2018-0773, CVE-2018-0774, CVE-2018-0775, CVE-2018-0776, CVE-2018-0777, CVE-2018-0778, CVE-2018-0780, CVE-2018-0781 #4503

v1.7.5

This patch release of ChakraCore 1.7 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2017-11889, CVE-2017-11893, CVE-2017-11894, CVE-2017-11905, CVE-2017-11908, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11912, CVE-2017-11914, CVE-2017-11916, CVE-2017-11918, CVE-2017-11919, CVE-2017-11930 #4411

v1.7.4

This patch release of ChakraCore 1.7 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2017-11791, CVE-2017-11836, CVE-2017-11837, CVE-2017-11838, CVE-2017-11840, CVE-2017-11841, CVE-2017-11843, CVE-2017-11846, CVE-2017-11858, CVE-2017-11861, CVE-2017-11862, CVE-2017-11870, CVE-2017-11871, CVE-2017-11873, CVE-2017-11874, CVE-2017-11866, CVE-2017-11859 #4226

v1.7.3

This patch release of ChakraCore 1.7 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2017-11792, CVE-2017-11796, CVE-2017-11797, CVE-2017-11799, CVE-2017-11801, CVE-2017-11802, CVE-2017-11805, CVE-2017-11806, CVE-2017-11807, CVE-2017-11808, CVE-2017-11809, CVE-2017-11811, CVE-2017-11812, CVE-2017-11821 #3917

v1.7.2

This patch release of ChakraCore 1.7 includes security fixes, performance improvements, and bugfixes.

Security

• Change to address CVE-2017-8741, CVE-2017-8748, CVE-2017-11767, CVE-2017-8756, CVE-2017-8753, CVE-2017-8729, CVE-2017-8739, CVE-2017-8751, CVE-2017-8757, CVE-2017-11764, CVE-2017-8660, CVE-2017-8755, CVE-2017-8649, CVE-2017-8740, CVE-2017-8752 #3729

v1.7.1

This patch release of ChakraCore 1.7 includes security fixes, performance improvements and JSRT API changes. See notable changes below.

Security

• Change to address CVE-2017-0228, CVE-2017-8634, CVE-2017-8635, CVE-2017-8636, CVE-2017-8637, CVE-2017-8638, CVE-2017-8640, CVE-2017-8641, CVE-2017-8645, CVE-2017-8646, CVE-2017-8647, CVE-2017-8655, CVE-2017-8656, CVE-2017-8657, CVE-2017-8658, CVE-2017-8659, CVE-2017-8670, CVE-2017-8671, CVE-2017-8672, CVE-2017-8674 #3509

Performance

• Remove tzdata sync calls on xplat #3420

JSRT

• Add JsGetDataViewInfo #3462
• Modify JsCopyString to return actual count of utf8 bytes #3433

v1.7.0

ChakraCore 1.7.0 includes performance improvements and support for building Node-ChakraCore with link-time optimizations. It adds the following new JSRT APIs:

• JsHasOwnProperty #3316.
• JsCopyStringOneByte #3408.

ChakraCore 1.6

v1.6.2

This patch release of ChakraCore 1.6 includes the following security fixes:

Security

• Change to address CVE-2017-8741, CVE-2017-8748, CVE-2017-11767, CVE-2017-8756, CVE-2017-8753, CVE-2017-8729, CVE-2017-8739, CVE-2017-8751, CVE-2017-8757, CVE-2017-11764, CVE-2017-8660, CVE-2017-8755, CVE-2017-8649, CVE-2017-8740, CVE-2017-8752 #3729

v1.6.1

This patch release of ChakraCore 1.6 includes security fixes and bug fixes. See notable changes below.

Security

• Change to address CVE-2017-0228, CVE-2017-8634, CVE-2017-8635, CVE-2017-8636, CVE-2017-8637, CVE-2017-8638, CVE-2017-8640, CVE-2017-8641, CVE-2017-8645, CVE-2017-8646, CVE-2017-8647, CVE-2017-8655, CVE-2017-8656, CVE-2017-8657, CVE-2017-8658, CVE-2017-8659, CVE-2017-8670, CVE-2017-8671, CVE-2017-8672, CVE-2017-8674 #3509

v1.6.0

ChakraCore 1.6.0 includes more JavaScript and WebAssembly feature updates and performance enhancements. See notable changes below.

Language

• Enable WebAssembly MVP on by default #2447
• Enable SharedArrayBuffer on by default #2939
• Enable dynamic module import #2913
• Support ES6 iterators for DOM objects 58ac5aeb7
• Remove SIMD support in JavaScript #3296

Performance

• Support function body (re-)deferral in lexical scopes and parameter scopes #2666
• Use PolymorphicInlineCache for obj[string] pattern #2883
• Enable optimizer on functions with try/finally #2954

ChakraCore 1.5

v1.5.3

This patch release of ChakraCore 1.5 includes the following security fixes:

• Change to address CVE-2017-8598, CVE-2017-8601, CVE-2017-8603, CVE-2017-8604, CVE-2017-8606, CVE-2017-8607, CVE-2017-8608, CVE-2017-8609, CVE-2017-8610, CVE-2017-8619 #3341

v1.5.2

This patch release of ChakraCore 1.5 includes the following security fixes:

• Change to address CVE-2017-0228, CVE-2017-8499, CVE-2017-8518, CVE-2017-8520, CVE-2017-8522, CVE-2017-8524, CVE-2017-8548 #3166

v1.5.1

This patch release of ChakraCore 1.5 includes a fix for a handle leak when creating multiple runtimes #3092

v1.5.0

ChakraCore 1.5.0 includes cross-platform concurrent/partial GC support and a set of new JSRT APIs among other changes. See notable changes below.

• Enable broader software-based write barrier support in ChakraCore GC #2372
• Turn on ChakraCore concurrent/partial GC for Linux/OSX
• New experimental JSRT APIs
  • JsCreatePromise - add API to create promise #2594
  • JsGetAndClearExceptionWithMetadata - add API to clear exception and expose additional information #2936
  • JsWeakRef/JsCreateWeakReference/JsGetWeakReferenceValue - add weak reference APIs #2948

ChakraCore 1.4

v1.4.5

This patch release of ChakraCore 1.4 includes a fix for a handle leak when creating multiple runtimes #3092.

v1.4.4

This patch release of ChakraCore 1.4 includes the following security fixes:

• Change to address CVE-2017-0229, CVE-2017-0223, CVE-2017-0224, CVE-2017-0252, CVE-2017-0230, CVE-2017-0234, CVE-2017-0235, CVE-2017-0236, CVE-2017-0228, CVE-2017-0238, CVE-2017-0266 #2959

v1.4.3

This patch release of ChakraCore 1.4 includes the following fixes:

• Change to address CVE-2017-0093 and CVE-2017-0208 #2834
• Internal fixes in Windows 10 Creators Update #2826

v1.4.2

This patch release of ChakraCore 1.4 includes the following security fixes:

• Change to address CVE-2017-0067, CVE-2017-0150, CVE-2017-0138, CVE-2017-0094, CVE-2017-0132, CVE-2017-0133, CVE-2017-0134, CVE-2017-0137, CVE-2017-0071, CVE-2017-0151, CVE-2017-0141, CVE-2017-0196, CVE-2017-0136, CVE-2017-0152, CVE-2017-0010, CVE-2017-0035, CVE-2017-0015, CVE-2017-0028 #2697

v1.4.1

This patch release of ChakraCore 1.4 enables using ChakraCore NuGet packages for developing .NET and native applications (#2266, #85) and includes other bug fixes.

v1.4.0

ChakraCore 1.4.0 includes cross-platform JIT support and experimental WebAssembly support along with other language, performance and JSRT updates. See notable changes below.

• ChakraCore JIT on Linux and MacOS #1591 #1744
• Enhance Time Travel Debugging support
• Enable Async Functions by default #1691
• Enable SharedArrayBuffer under experimental flag #1759
• Enable WebAssembly browser preview support under experimental flag #1985
• Update JSRT String APIs (experimental) #1830
• Memory reduction through function body redeferral #1585
• Add out-of-process JIT support in Microsoft Edge #1561

ChakraCore 1.3

v1.3.2

This patch release of ChakraCore 1.3 includes the following security fixes:

• Change to address bad binding of async arrow function parameters #2219
• All fixes included in v1.2.3

v1.3.1

This patch release of ChakraCore 1.3 includes the following security fixes:

• Change to address CVE-2016-7207 #1979
• All fixes included in v1.2.2

v1.3.0

Release 1.3.0 includes experimental support on x64 Linux/OSX, experimental JSRT debugging APIs, and other language and performance updates. See notable changes below.

Cross-platform

• ChakraCore interpreter and runtime on x64 Linux (still working on JIT or concurrent/partial GC)
• ChakraCore interpreter and runtime on x64 OSX (still working on JIT or concurrent/partial GC) #1134

Language

• Enable Symbol.toStringTag by default #1383
• Enable String.prototype.padStart and String.prototype.padEnd by default #1257
• Enable Symbol.prototype[@@toPrimitive] and Date.prototype[@@toPrimitive] under experimental flag #1319
• Enable Symbol.isConcatSpreadable under experimental flag #1198
• Enable Symbol.hasInstance under experimental flag #1063

Performance

• Optimize creation of Heap arguments object (91e0e91)
• Add fastpath for when Object.hasOwnProperty returns true #1449
• Enable script function inlining in jitted loop bodies #1182

JSRT

• JSRT Debugging APIs (experimental) #926
• JSRT Module API (experimental) #1254

Test

• Introduce C++ unit testing mechanism using Catch #1224

ChakraCore 1.2

v1.2.3

This patch release of ChakraCore 1.2 includes the following security fixes:

• Change to address CVE-2016-7287,CVE-2016-7286,CVE-2016-7288,CVE-2016-7296 #2230

v1.2.2

This patch release of ChakraCore 1.2 includes the following security fixes:

• Change to address CVE-2016-7200, CVE-2016-7201, CVE-2016-720, CVE-2016-7203, CVE-2016-7208, CVE-2016-7240, CVE-2016-7241, CVE-2016-7242, CVE-2016-7243 #1942

v1.2.1

This patch release of ChakraCore 1.2 includes the following security fixes:

• Fixed Address deref issue #1530
• Combined fixes for CVE-2016-3350, CVE-2016-3377 and a defense in depth change in the CustomHeap (24c4d7d)
• Changes addressing CVE_2016-3382, CVE-2016-3385, CVE-2016-3386, CVE-2016-3389, CVE-2016-3390, CVE-2016-7189, and a mitigation of a CFG bypass. (f05c42e)

v1.2.0

• Turn support for ES2015 Destructuring Assignment on by default
• Turn support for ES2015 Default Parameters on by default
• Turn support for the proposed ECMAScript Exponentiation Operator on by default
• Enable proposed ECMAScript Async Functions behind an experimental flag
• Enable ES2015 Modules behind an experimental flag
• Includes multiple changes to reduce memory consumption