Jake Bailey

@jakebailey

According to git blame, I wrote the TypeScript compiler, don't fact check that Principal Software Engineer at Microsoft working on TypeScript Underground gopher, finally revealed jakebailey.dev github.com/jakebailey arch btw

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Jake Bailey@jakebailey· 17d

Nirvanna The Band The Show The Movie

(spoilers)

scene where they jump off the CN Tower

Jake Bailey@jakebailey· Jul 12

lived my dream and saw les mis in the front row in the west end, truly incredible experience and @savannah.dev liked it, which is a win i've now seen it three times, which I'm declaring to be normal

Me sitting front row in Sondheim theater at les miz

Jake Bailey@jakebailey· Jul 1

A week on and it's still working well; it required a gopls change (go.dev/cl/795221, hope that's released soon!). With 5 day pruning like Go does itself, that 5 day window leaves me sitting at about 150GB of cache, which comes out to about 20GB on disk. Very good!

Configuration:
Cache directory /home/jake/.cache/gocachez
Version directory /home/jake/.cache/gocachez/v1
Max size 20.0GiB
Max age 5d
Verbose false

Summary:
State present
Cached actions 87014
Cached outputs 44924
Oldest cache entry 4d 15h
Live runs 0 active, 2011 inactive

Storage:
Original output size 162.1GiB
Compressed cache blobs 15.8GiB (44924 files)
Blob max usage 15.8GiB / 20.0GiB (78.9%, 4.2GiB remaining)
Retained go-list files 3.4GiB (16918 files)
Total stored 19.2GiB
Blob-only savings 146.4GiB (90.3%)
Overall savings 142.9GiB (88.1%)

Compressed blob contents:
Type Files Original Stored Savings
Go package archives 16353 160.6GiB 15.7GiB 145.0GiB ( 90.2%)
Go test input logs 248 930.3MiB 42.5MiB 887.8MiB ( 95.4%)
Go test outputs 660 560.7MiB 46.3MiB 514.4MiB ( 91.7%)
Go package indexes 20686 31.8MiB 8.7MiB 23.1MiB ( 72.6%)
Generated cgo sources 155 1.4MiB 261.4KiB 1.2MiB ( 82.3%)
Go source files 466 1.4MiB 378.8KiB 1.0MiB ( 73.5%)
Go source file lists 6232 860.9KiB 712.0KiB 148.9KiB ( 17.3%)
Go analysis facts 114 133.7KiB 35.4KiB 98.3KiB ( 73.5%)
C compiler IDs 6 660B 738B -78B ( -11.8%)
Go tool flag probes 2 9B 35B -26B (-288.9%)
Text files 1 3B 16B -13B (-433.3%)
Empty files 1 0B 13B 0B ( 0.0%)

Retained go-list files:
Type Files Size
Export archives 16291 3.4GiB
Generated cgo sources 155 1.4MiB
Generated test mains 466 1.4MiB
Other retained files 6 18.4KiB

Jake Bailey@jakebailey· Jun 29

Appreciate the test case!

| Case | tsc check time | tsgo before | tsgo after | Improvement |
|---|---:|---:|---:|---:|
| Full gist repro | ~4.8-5.4s | ~5.2s | ~1.4s | ~3.7x faster |
| Type only | 0.69s | 2.44s | 0.61s | ~4.0x faster |
| Valid assignments only | 0.68s | 2.38s | 0.61s | ~3.9x faster |
| Invalid assignments only | 3.01s | 3.45s | 1.36s | ~2.5x faster |
| Mixed first block | 3.01s | 3.38s | 1.20s | ~2.8x faster |

Jake Bailey@jakebailey· Jun 22

Did a bit of hacking this weekend and cooked up "gocachez", a GOCACHEPROG which transparently compresses the Go build cache to save disk space at rest at the cost of CPU, with fairly good results. Building and testing TS would normally eat up roughly 4GB, but with gocachez it's only about 400MB.

~  go env GOCACHEPROG
gocachez
~  gocachez status
Configuration:
Cache directory /home/jabaile/.cache/gocachez
Version directory /home/jabaile/.cache/gocachez/v1
Max size 20.0GiB (21474836480 bytes)
Verbose false

Catalog:
State present
Entries 2465
Outputs 1146
Uncompressed size 4.5GiB (4856553973 bytes)
Compressed size 428.5MiB (449308207 bytes)
Savings 4.1GiB (90.7%)
Runs 0

Storage:
Kind Files Size
Blobs 1146 428.5MiB (449308207 bytes)
Retained files 426 75.9MiB (79539189 bytes)

Blob types (best effort):
Type Files Uncompressed Compressed Extra
Go package archives 416 4.4GiB (4716189032 bytes) 421.0MiB (441457527 bytes) export data: 75.8MiB (79487346 bytes)
Text files 363 101.6MiB (106522835 bytes) 4.6MiB (4868707 bytes)
Unknown binary files 56 30.0MiB (31468529 bytes) 2.4MiB (2496554 bytes)
Go package indexes 259 2.2MiB (2303696 bytes) 454.5KiB (465442 bytes)
Go analysis facts 40 45.4KiB (46439 bytes) 11.5KiB (11787 bytes)
Generated cgo sources 10 22.8KiB (23343 bytes) 7.9KiB (8065 bytes)
C compiler IDs 1 99B (99 bytes) 112B (112 bytes)
Empty files 1 0B (0 bytes) 13B (13 bytes)

Retained file types:
Type Files Size
Export archives 416 75.8MiB (79515846 bytes)
Generated cgo sources 10 22.8KiB (23343 bytes)

Live runs:
State Count
Active 0
Inactive 1

Jake Bailey@jakebailey· Jun 16

the proof

hyperfine 'go build -a ./cmd/tsgo' '~/work/go/bin/go build -a ./cmd/tsgo'
Benchmark 1: go build -a ./cmd/tsgo
Time (mean ± σ): 47.478 s ± 0.270 s [User: 343.232 s, System: 8.006 s]
Range (min … max): 47.015 s … 47.867 s 10 runs

Benchmark 2: ~/work/go/bin/go build -a ./cmd/tsgo
Time (mean ± σ): 28.610 s ± 0.091 s [User: 144.987 s, System: 4.340 s]
Range (min … max): 28.457 s … 28.720 s 10 runs

Summary
~/work/go/bin/go build -a ./cmd/tsgo ran
1.66 ± 0.01 times faster than go build -a ./cmd/tsgo

Jake Bailey@jakebailey· Jun 15

This is a fun one: I just sent go.dev/cl/790740, which elides method wrappers for embedded types at offset zero, common for mixins/inherited data types. Doing this removes 60 _thousand_ method wrappers from tsgo's AST package, dropping the compilation of our main exe from 49s to 28s on my machine.

Benchmark 1: go build -a ./cmd/tsgo
Time (mean ± σ): 48.992 s ± 0.274 s [User: 345.152 s, System: 12.545 s]
Range (min … max): 48.702 s … 49.478 s 10 runs

Benchmark 2: ~/work/go/bin/go build -a ./cmd/tsgo
Time (mean ± σ): 28.323 s ± 0.133 s [User: 141.277 s, System: 4.853 s]
Range (min … max): 28.075 s … 28.555 s 10 runs

Summary
~/work/go/bin/go build -a ./cmd/tsgo ran
1.73 ± 0.01 times faster than go build -a ./cmd/tsgo

Jake Bailey@jakebailey· May 24

fine, be that way

Star Trek TNG title card, "cause and effect"

Jake Bailey@jakebailey· May 23

Star Trek Voyager title card, says "エンドレスエイト vi"

Jake Bailey@jakebailey· May 6

My talk was accepted to GopherCon 2026 in Seattle! I'm back with more TypeScript+Go goodness, this time with another year's worth of experience under our belt. I had a blast at last year's conference, so here's to yet another one! www.gophercon.com/agenda/speak...

Jake Bailey
Principal Software Engineer
Microsoft
Jake is a programming language lover and Principal Software Engineer at Microsoft. He currently works on TypeScript, mainly focusing on performance, infrastructure, and the ecosystem, along with side adventures in Go (especially compiler and runtime changes in Go and TinyGo!).
Blog: jakebailey.dev
SESSIONS
Wed Aug 05, 5:15 PM - 5:40 PM PDT (25 min)
State of TypeScript 7: Beyond the Port - Speaker
Last year, we shared the story of TypeScript's port to Go. A lot has happened since then: we've shipped TypeScript 6.0 as a bridge release, watched our native preview grow past 5 million weekly downloads. The port is done, but the work didn't stop there.

In this talk, we'll go beyond the port itself. We'll cover the new API surfaces we've built on top of the Go codebase, including a snapshot-based language server, cross-language IPC, and Wasm. We'll talk about how the community has adopted the new compiler, how we've ensured stability at scale, and what surprises and compromises came up along the way. We'll also share our continued experience writing Go; where the language and toolchain have gotten better for us, and where they sometimes haven't.

Talk/Attendee Level: Intermediate

Finneran Ballroom 2, Level 5, SCC | Summit

Jake Bailey@jakebailey· May 3

Happy anniversary to my wonderful wife @savannah.dev ❤️ In addition to a magazine cover (??), we are now in space (!!)

Wedding photo, me kissing Savannah, taken from space on the mark rober selfie satellite

Jake Bailey@jakebailey· Apr 21

winning

npmx graph, likes, hereby has 1, gulp has 0, an infinite ratio

Jake Bailey@jakebailey· Apr 15

holy shit

Jake Bailey@jakebailey· Apr 12

"Jesus, I see what you've done for other people, and I want that for me." meme

Jake Bailey@jakebailey· Mar 23

but dave what am I supposed to do if I already own all of them

https://store.steampowered.com/publisher/WadjetEyeGames but I already own every game published by Wadjet Eye

Jake Bailey@jakebailey· Mar 22

Darth Vader isn't killing Han Solo, and the Empire found a near-perfect compromise

I am altering the deal, pray I do not alter it further

Jake Bailey@jakebailey· Mar 16

Fun fact, the original @frame.work bezel has adhesive attaching it to the screen Ask me how I know 🫠🫠🫠

Framework laptop, cool see-through bezel, except I broke a quarter of the screen while removing the old one thanks to adhesive

Jake Bailey@jakebailey· Mar 11

"you can't be serious" you say alright alright, fine, you got me

now it's a virgoo turbocharger controller

Jake Bailey@jakebailey· Mar 11

you might not believe it but this is how I code

pocket voltex controller where my keyboard should be

Jake Bailey@jakebailey· Feb 11

Some pretty awesome improvements in 1.26 for compiling/testing typescript-go. With a clean build/test cache, running the full test suite used to take 3m45s, but now takes just 2m10s.

go version go1.25.7 linux/amd64
[11:09:32.210] [0] $ gotestsum --format-hide-empty-pkg --hide-summary skipped -- ./...
[11:13:16.754] [0] ✔ (done in 3m 44.5s)
✓ internal/vfs/osvfs (7ms)
✓ internal/vfs/cachedvfs (7ms)
✓ internal/tspath (14ms)
✓ internal/tsoptions (37ms)
✓ internal/vfs/vfstest (175ms)
✓ internal/testrunner (18.551s)

DONE 142758 tests, 2805 skipped in 97.329s
Finished test in 3m 45.1s
Completed test in 3m 45.1s
go version go1.26.0 linux/amd64
[11:13:18.483] [0] $ gotestsum --format-hide-empty-pkg --hide-summary skipped -- ./...
[11:15:27.835] [0] ✔ (done in 2m 9.3s)
✓ internal/project/ata (1.064s)
✓ internal/fourslash/tests/manual (1.223s)
✓ internal/project (2.253s)
✓ internal/parser (4.865s)
✓ internal/fourslash/tests/gen (5.858s)
✓ internal/testrunner (21.411s)

DONE 142758 tests, 2805 skipped in 31.448s
Finished test in 2m 10s
Completed test in 2m 10s

Jake Bailey@jakebailey· Jan 31

this is beyond unfair

Rotten Tomatoes for The Master of Disguise, 1%

Jake Bailey@jakebailey· Jan 16

Jake Bailey@jakebailey· Jan 2

Computer Architecture: A Quantitative Approach

Hennessy and Patterson

Jake Bailey@jakebailey· Dec 17

>receive usps informed delivery email >look inside >omaha steaks ad

"look inside" cat meme

It's a tabby cat looking at the camera I don't know how to explain this better sorry

Jake Bailey@jakebailey· Dec 13

Did something fun; used @tinygo.org to shove @mvdan.cc's wonderful gofumpt into @dsherret.bsky.social's amazing dprint formatter via a Wasm plugin. We previously used an "exec" plugin to do this with go tool, but it was slow to run, and worse in parallel (and... Windows 😑). Now it's fast!

Benchmark 1: dprint fmt --incremental=false (branch = main)
Time (mean ± σ): 42.703 s ± 0.412 s [User: 0.733 s, System: 0.569 s]
Range (min … max): 41.742 s … 43.399 s 10 runs

Benchmark 2: dprint fmt --incremental=false (branch = jabaile/gofumpt-plugin)
Time (mean ± σ): 633.1 ms ± 14.8 ms [User: 4887.2 ms, System: 1083.9 ms]
Range (min … max): 617.3 ms … 663.2 ms 10 runs

Summary
dprint fmt --incremental=false (branch = jabaile/gofumpt-plugin) ran
67.45 ± 1.70 times faster than dprint fmt --incremental=false (branch = main)

Jake Bailey@jakebailey· Dec 5

red prohibited sign over:
UnionToIntersection
UnionToArray
IsEqual

THESE ARE NOT MADE
THEY SHOULD NEVER BE MADE
WE WILL NOT MAKE THEM
WE WILL NOT HELP MAKE THEM

JPEG artifacting to the max

Jake Bailey@jakebailey· Dec 4

when a file doesn't end in a trailing newline

"umimpressed kid" meme, he's a kid making an unimpressed face wearing a spongebob shirt in what is presumably a school photo, printed on matte photo paper

Jake Bailey@jakebailey· Nov 24

who are all you people

Repository
github.com/microsoft/typescript-go

Homepage
www.typescriptlang.org/

Weekly Downloads
1,780,300

Jake Bailey@jakebailey· Nov 19

Defining inline does work, though loses the nice package name even t huogh I did specify name: "scripts" But, this doesn't really scale... I just have the one package so I'll just use multiple configs, I suppose

> @typescript/benchmarking@0.0.0 test /home/jabaile/work/TypeScript-benchmarking
> vitest

DEV v4.0.10 /home/jabaile/work/TypeScript-benchmarking

✓ 0 scripts/src/__tests__/setupPipeline.test.ts (20 tests) 80ms
✓ setupPipeline input=baseline 12ms
✓ setupPipeline input=full 4ms
✓ setupPipeline input=regular 5ms
✓ setupPipeline input=tsc-only 5ms
✓ setupPipeline input=tsserver-only 3ms
✓ setupPipeline input=startup-only 3ms
✓ setupPipeline input=faster 4ms
✓ setupPipeline input=bun 3ms
✓ setupPipeline input=vscode 3ms

Jake Bailey@jakebailey· Nov 19

Does anyone know what the deal is with vitest v4 trying to run my dist dir? I know the defaults changed, but it does not respect either an exclude of `**/dist/**` or an include to only include TS files Pulling my hair out a bit :(