fix(52440): typeof ... === "undefined" check on mapped object member doesn't narrow correctly, for only some purposes

[a-tarasyuk]

Fixes #52440

[RyanCavanaugh]

This looks right but I don't want to get surprised

@typescript-bot test this
@typescript-bot test top100
@typescript-bot user test this
@typescript-bot user test tsserver
@typescript-bot test tsserver top100
@typescript-bot run dt
@typescript-bot perf test this

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the perf test suite on this PR at e09645c. You can monitor the build here.

Update: The results are in!

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the parallelized Definitely Typed test suite on this PR at e09645c. You can monitor the build here.

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the diff-based user code test suite on this PR at e09645c. You can monitor the build here.

Update: The results are in!

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the diff-based top-repos suite on this PR at e09645c. You can monitor the build here.

Update: The results are in!

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the diff-based user code test suite (tsserver) on this PR at e09645c. You can monitor the build here.

Update: The results are in!

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the extended test suite on this PR at e09645c. You can monitor the build here.

[typescript-bot]

Heya @RyanCavanaugh, I've started to run the diff-based top-repos suite (tsserver) on this PR at e09645c. You can monitor the build here.

Update: The results are in!

[typescript-bot]

@RyanCavanaugh Here are the results of running the user test suite comparing main and refs/pull/52456/merge:

Everything looks good!

[typescript-bot]

@RyanCavanaugh Here are the results of running the user test suite comparing main and refs/pull/52456/merge:

Everything looks good!

[typescript-bot]

Heya @RyanCavanaugh, I've run the RWC suite on this PR - assuming you're on the TS core team, you can view the resulting diff here.

[typescript-bot]

@RyanCavanaugh Here are the results of running the top-repos suite comparing main and refs/pull/52456/merge:

Everything looks good!

[typescript-bot]

@RyanCavanaugh Here are the results of running the top-repos suite comparing main and refs/pull/52456/merge:

Everything looks good!

[typescript-bot]

@RyanCavanaugh
The results of the perf run you requested are in!

Here they are:

Compiler

Comparison Report - main..52456

Metric	main	52456	Delta	Best	Worst
Angular - node (v18.10.0, x64)
Memory used	359,843k (± 0.02%)	359,777k (± 0.01%)	-66k (- 0.02%)	359,736k	359,878k
Parse Time	3.96s (± 0.65%)	3.93s (± 0.73%)	-0.03s (- 0.84%)	3.89s	3.97s
Bind Time	1.17s (± 0.54%)	1.17s (± 0.35%)	+0.00s (+ 0.14%)	1.17s	1.18s
Check Time	8.63s (± 0.32%)	8.62s (± 0.56%)	-0.00s (- 0.06%)	8.56s	8.70s
Emit Time	7.59s (± 0.39%)	7.61s (± 0.51%)	+0.02s (+ 0.20%)	7.54s	7.66s
Total Time	21.35s (± 0.19%)	21.33s (± 0.42%)	-0.02s (- 0.09%)	21.24s	21.49s
Compiler-Unions - node (v18.10.0, x64)
Memory used	192,532k (± 0.07%)	192,413k (± 0.07%)	-119k (- 0.06%)	192,210k	192,532k
Parse Time	1.64s (± 2.00%)	1.63s (± 1.72%)	-0.01s (- 0.30%)	1.59s	1.66s
Bind Time	0.79s (± 0.52%)	0.79s (± 0.65%)	+0.00s (+ 0.21%)	0.79s	0.80s
Check Time	9.61s (± 0.24%)	9.67s (± 0.50%)	+0.06s (+ 0.59%)	9.63s	9.76s
Emit Time	2.88s (± 5.77%)	2.92s (± 5.11%)	+0.04s (+ 1.51%)	2.80s	3.11s
Total Time	14.92s (± 1.16%)	15.02s (± 0.87%)	+0.10s (+ 0.66%)	14.90s	15.19s
Monaco - node (v18.10.0, x64)
Memory used	343,964k (± 0.01%)	343,981k (± 0.01%)	+17k (+ 0.00%)	343,952k	344,010k
Parse Time	2.95s (± 0.93%)	2.95s (± 0.94%)	-0.00s (- 0.06%)	2.90s	2.97s
Bind Time	1.03s (± 1.29%)	1.03s (± 0.96%)	-0.00s (- 0.32%)	1.02s	1.04s
Check Time	7.06s (± 0.53%)	7.07s (± 0.43%)	+0.01s (+ 0.19%)	7.04s	7.12s
Emit Time	4.34s (± 0.83%)	4.33s (± 0.24%)	-0.01s (- 0.23%)	4.32s	4.35s
Total Time	15.39s (± 0.37%)	15.39s (± 0.30%)	+0.00s (+ 0.01%)	15.32s	15.44s
TFS - node (v18.10.0, x64)
Memory used	300,380k (± 0.01%)	300,371k (± 0.01%)	-9k (- 0.00%)	300,339k	300,416k
Parse Time	2.25s (± 1.16%)	2.24s (± 1.56%)	-0.01s (- 0.52%)	2.21s	2.29s
Bind Time	1.17s (± 1.08%)	1.17s (± 0.64%)	-0.00s (- 0.14%)	1.16s	1.18s
Check Time	6.50s (± 0.50%)	6.53s (± 0.95%)	+0.03s (+ 0.41%)	6.46s	6.62s
Emit Time	3.91s (± 0.44%)	3.93s (± 0.62%)	+0.02s (+ 0.47%)	3.91s	3.97s
Total Time	13.84s (± 0.50%)	13.86s (± 0.52%)	+0.03s (+ 0.20%)	13.74s	13.94s
material-ui - node (v18.10.0, x64)
Memory used	476,737k (± 0.00%)	476,796k (± 0.02%)	+59k (+ 0.01%)	476,711k	476,920k
Parse Time	3.57s (± 0.23%)	3.56s (± 0.79%)	-0.01s (- 0.19%)	3.51s	3.59s
Bind Time	0.96s (± 0.54%)	0.97s (± 0.42%)	+0.01s (+ 0.52%)	0.96s	0.97s
Check Time	17.07s (± 0.66%)	17.04s (± 0.55%)	-0.03s (- 0.20%)	16.91s	17.17s
Emit Time	0.00s (± 0.00%)	0.00s (± 0.00%)	0.00s ( NaN%)	0.00s	0.00s
Total Time	21.60s (± 0.51%)	21.56s (± 0.47%)	-0.04s (- 0.16%)	21.43s	21.68s
xstate - node (v18.10.0, x64)
Memory used	548,679k (± 0.02%)	548,602k (± 0.01%)	-77k (- 0.01%)	548,526k	548,694k
Parse Time	4.55s (± 0.38%)	4.56s (± 0.27%)	+0.00s (+ 0.07%)	4.54s	4.57s
Bind Time	1.72s (± 1.04%)	1.71s (± 1.25%)	-0.01s (- 0.48%)	1.69s	1.74s
Check Time	2.72s (± 0.99%)	2.72s (± 0.91%)	+0.00s (+ 0.06%)	2.69s	2.75s
Emit Time	0.09s (± 5.95%)	0.08s (± 6.19%)	🟩-0.00s (- 3.85%)	0.08s	0.09s
Total Time	9.08s (± 0.27%)	9.08s (± 0.54%)	+0.00s (+ 0.04%)	9.05s	9.16s
Angular - node (v16.17.1, x64)
Memory used	359,209k (± 0.00%)	359,219k (± 0.00%)	+10k (+ 0.00%)	359,192k	359,242k
Parse Time	4.17s (± 0.13%)	4.17s (± 0.12%)	-0.00s (- 0.04%)	4.17s	4.18s
Bind Time	1.22s (± 0.68%)	1.23s (± 0.99%)	+0.00s (+ 0.14%)	1.21s	1.24s
Check Time	9.40s (± 0.42%)	9.41s (± 0.44%)	+0.01s (+ 0.09%)	9.36s	9.47s
Emit Time	8.05s (± 0.29%)	8.04s (± 0.33%)	-0.01s (- 0.10%)	8.01s	8.08s
Total Time	22.85s (± 0.17%)	22.85s (± 0.25%)	-0.00s (- 0.01%)	22.77s	22.91s
Compiler-Unions - node (v16.17.1, x64)
Memory used	194,270k (± 0.03%)	194,240k (± 0.03%)	-30k (- 0.02%)	194,172k	194,294k
Parse Time	1.81s (± 0.67%)	1.81s (± 0.49%)	+0.00s (+ 0.18%)	1.80s	1.82s
Bind Time	0.84s (± 0.61%)	0.84s (± 1.06%)	-0.00s (- 0.40%)	0.83s	0.85s
Check Time	10.38s (± 0.41%)	10.38s (± 0.74%)	0.00s ( 0.00%)	10.32s	10.53s
Emit Time	3.06s (± 0.67%)	3.06s (± 0.93%)	-0.00s (- 0.11%)	3.02s	3.10s
Total Time	16.09s (± 0.35%)	16.09s (± 0.42%)	-0.00s (- 0.01%)	16.02s	16.21s
Monaco - node (v16.17.1, x64)
Memory used	343,260k (± 0.01%)	343,257k (± 0.02%)	-3k (- 0.00%)	343,212k	343,347k
Parse Time	3.18s (± 1.39%)	3.18s (± 1.25%)	0.00s ( 0.00%)	3.12s	3.23s
Bind Time	1.11s (± 0.68%)	1.11s (± 0.46%)	+0.00s (+ 0.45%)	1.11s	1.12s
Check Time	7.71s (± 0.25%)	7.74s (± 0.28%)	+0.02s (+ 0.30%)	7.71s	7.76s
Emit Time	4.52s (± 0.41%)	4.52s (± 0.60%)	0.00s ( 0.00%)	4.49s	4.56s
Total Time	16.52s (± 0.22%)	16.55s (± 0.41%)	+0.03s (+ 0.16%)	16.49s	16.65s
TFS - node (v16.17.1, x64)
Memory used	299,763k (± 0.01%)	299,768k (± 0.01%)	+5k (+ 0.00%)	299,734k	299,784k
Parse Time	2.47s (± 1.44%)	2.46s (± 0.88%)	-0.00s (- 0.14%)	2.43s	2.49s
Bind Time	1.25s (± 0.60%)	1.25s (± 0.41%)	+0.00s (+ 0.13%)	1.25s	1.26s
Check Time	7.17s (± 0.39%)	7.18s (± 0.70%)	+0.02s (+ 0.23%)	7.13s	7.27s
Emit Time	4.21s (± 0.61%)	4.21s (± 0.58%)	-0.01s (- 0.16%)	4.18s	4.24s
Total Time	15.10s (± 0.37%)	15.10s (± 0.28%)	-0.00s (- 0.00%)	15.04s	15.15s
material-ui - node (v16.17.1, x64)
Memory used	476,072k (± 0.02%)	476,052k (± 0.01%)	-20k (- 0.00%)	475,994k	476,142k
Parse Time	3.71s (± 0.28%)	3.72s (± 0.11%)	+0.01s (+ 0.22%)	3.72s	3.73s
Bind Time	1.01s (± 0.51%)	1.02s (± 0.00%)	+0.01s (+ 0.66%)	1.02s	1.02s
Check Time	18.18s (± 0.82%)	18.06s (± 0.10%)	-0.12s (- 0.63%)	18.04s	18.08s
Emit Time	0.00s (± 0.00%)	0.00s (± 0.00%)	0.00s ( NaN%)	0.00s	0.00s
Total Time	22.91s (± 0.66%)	22.80s (± 0.07%)	-0.11s (- 0.46%)	22.78s	22.82s
xstate - node (v16.17.1, x64)
Memory used	546,315k (± 0.02%)	546,384k (± 0.02%)	+69k (+ 0.01%)	546,246k	546,499k
Parse Time	4.77s (± 0.59%)	4.75s (± 0.59%)	-0.02s (- 0.31%)	4.71s	4.79s
Bind Time	1.82s (± 3.93%)	1.84s (± 0.77%)	+0.02s (+ 1.38%)	1.82s	1.86s
Check Time	3.01s (± 2.87%)	2.97s (± 0.82%)	-0.04s (- 1.28%)	2.94s	3.01s
Emit Time	0.09s (± 4.45%)	0.09s (± 5.53%)	+0.00s (+ 1.82%)	0.09s	0.10s
Total Time	9.68s (± 0.47%)	9.65s (± 0.34%)	-0.03s (- 0.31%)	9.60s	9.70s
Angular - node (v14.15.1, x64)
Memory used	352,844k (± 0.01%)	352,843k (± 0.01%)	-1k (- 0.00%)	352,819k	352,875k
Parse Time	4.21s (± 0.41%)	4.25s (± 0.48%)	+0.04s (+ 0.95%)	4.23s	4.28s
Bind Time	1.28s (± 0.32%)	1.28s (± 0.40%)	+0.00s (+ 0.39%)	1.28s	1.29s
Check Time	9.75s (± 0.22%)	9.67s (± 0.56%)	-0.08s (- 0.77%)	9.61s	9.76s
Emit Time	8.37s (± 0.58%)	8.40s (± 0.38%)	+0.03s (+ 0.32%)	8.37s	8.44s
Total Time	23.61s (± 0.27%)	23.61s (± 0.32%)	-0.00s (- 0.01%)	23.50s	23.71s
Compiler-Unions - node (v14.15.1, x64)
Memory used	189,683k (± 0.70%)	189,202k (± 0.07%)	-481k (- 0.25%)	189,063k	189,395k
Parse Time	1.84s (± 0.66%)	1.86s (± 0.74%)	+0.01s (+ 0.72%)	1.84s	1.88s
Bind Time	0.86s (± 0.60%)	0.87s (± 0.97%)	+0.01s (+ 0.97%)	0.86s	0.88s
Check Time	10.42s (± 0.70%)	10.39s (± 0.75%)	-0.03s (- 0.29%)	10.30s	10.51s
Emit Time	3.42s (± 3.85%)	3.39s (± 4.98%)	-0.02s (- 0.68%)	3.15s	3.52s
Total Time	16.54s (± 0.72%)	16.51s (± 0.95%)	-0.03s (- 0.20%)	16.26s	16.70s
Monaco - node (v14.15.1, x64)
Memory used	338,030k (± 0.00%)	338,032k (± 0.00%)	+2k (+ 0.00%)	338,014k	338,055k
Parse Time	3.22s (± 0.66%)	3.23s (± 0.74%)	+0.01s (+ 0.41%)	3.19s	3.25s
Bind Time	1.11s (± 0.68%)	1.11s (± 0.57%)	+0.00s (+ 0.15%)	1.10s	1.12s
Check Time	8.05s (± 0.54%)	8.06s (± 0.67%)	+0.01s (+ 0.17%)	7.97s	8.12s
Emit Time	4.74s (± 0.70%)	4.76s (± 0.36%)	+0.02s (+ 0.49%)	4.73s	4.78s
Total Time	17.11s (± 0.38%)	17.17s (± 0.48%)	+0.06s (+ 0.33%)	17.05s	17.24s
TFS - node (v14.15.1, x64)
Memory used	294,587k (± 0.01%)	294,604k (± 0.00%)	+17k (+ 0.01%)	294,586k	294,621k
Parse Time	2.76s (± 0.44%)	2.75s (± 0.23%)	-0.01s (- 0.18%)	2.74s	2.76s
Bind Time	1.10s (± 0.89%)	1.11s (± 0.76%)	+0.00s (+ 0.30%)	1.09s	1.11s
Check Time	7.49s (± 0.25%)	7.51s (± 0.45%)	+0.03s (+ 0.36%)	7.48s	7.55s
Emit Time	4.61s (± 0.63%)	4.61s (± 0.65%)	+0.00s (+ 0.11%)	4.57s	4.65s
Total Time	15.95s (± 0.34%)	15.98s (± 0.36%)	+0.02s (+ 0.15%)	15.90s	16.07s
material-ui - node (v14.15.1, x64)
Memory used	471,565k (± 0.00%)	471,563k (± 0.00%)	-3k (- 0.00%)	471,547k	471,583k
Parse Time	3.94s (± 0.67%)	3.94s (± 0.57%)	+0.01s (+ 0.17%)	3.92s	3.97s
Bind Time	1.04s (± 1.16%)	1.05s (± 0.49%)	+0.00s (+ 0.32%)	1.04s	1.05s
Check Time	18.94s (± 0.11%)	19.07s (± 0.34%)	+0.13s (+ 0.66%)	18.95s	19.13s
Emit Time	0.00s (± 0.00%)	0.00s (± 0.00%)	0.00s ( NaN%)	0.00s	0.00s
Total Time	23.92s (± 0.13%)	24.06s (± 0.30%)	+0.13s (+ 0.56%)	23.93s	24.12s
xstate - node (v14.15.1, x64)
Memory used	534,481k (± 0.00%)	534,468k (± 0.01%)	-13k (- 0.00%)	534,438k	534,507k
Parse Time	5.12s (± 0.69%)	5.16s (± 0.58%)	+0.05s (+ 0.88%)	5.11s	5.19s
Bind Time	1.71s (± 0.44%)	1.71s (± 0.78%)	+0.00s (+ 0.20%)	1.69s	1.73s
Check Time	3.10s (± 1.09%)	3.09s (± 0.67%)	-0.01s (- 0.38%)	3.07s	3.13s
Emit Time	0.10s (± 0.00%)	0.10s (± 0.00%)	0.00s ( 0.00%)	0.10s	0.10s
Total Time	10.03s (± 0.67%)	10.07s (± 0.47%)	+0.04s (+ 0.35%)	9.99s	10.12s

System

Machine Name	ts-ci-ubuntu
Platform	linux 5.4.0-135-generic
Architecture	x64
Available Memory	16 GB
Available Memory	15 GB
CPUs	4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Hosts

• node (v18.10.0, x64)
• node (v16.17.1, x64)
• node (v14.15.1, x64)

Scenarios

• Angular - node (v18.10.0, x64)
• Angular - node (v16.17.1, x64)
• Angular - node (v14.15.1, x64)
• Compiler-Unions - node (v18.10.0, x64)
• Compiler-Unions - node (v16.17.1, x64)
• Compiler-Unions - node (v14.15.1, x64)
• Monaco - node (v18.10.0, x64)
• Monaco - node (v16.17.1, x64)
• Monaco - node (v14.15.1, x64)
• TFS - node (v18.10.0, x64)
• TFS - node (v16.17.1, x64)
• TFS - node (v14.15.1, x64)
• material-ui - node (v18.10.0, x64)
• material-ui - node (v16.17.1, x64)
• material-ui - node (v14.15.1, x64)
• xstate - node (v18.10.0, x64)
• xstate - node (v16.17.1, x64)
• xstate - node (v14.15.1, x64)

Benchmark	Name	Iterations
Current	52456	6
Baseline	main	6

TSServer

Comparison Report - main..52456

Metric	main	52456	Delta	Best	Worst
Compiler-UnionsTSServer - node (v18.10.0, x64)
Req 1 - updateOpen	2,515ms (± 1.42%)	2,536ms (± 1.23%)	+21ms (+ 0.82%)	2,479ms	2,570ms
Req 2 - geterr	5,504ms (± 0.41%)	5,497ms (± 0.77%)	-7ms (- 0.12%)	5,449ms	5,548ms
Req 3 - references	363ms (± 0.73%)	365ms (± 0.73%)	+2ms (+ 0.55%)	361ms	369ms
Req 4 - navto	285ms (± 0.29%)	284ms (± 0.48%)	-0ms (- 0.12%)	283ms	287ms
Req 5 - completionInfo count	1,356 (± 0.00%)	1,356 (± 0.00%)	0 ( 0.00%)	1,356	1,356
Req 5 - completionInfo	68ms (± 5.11%)	66ms (± 1.24%)	🟩-3ms (- 3.67%)	64ms	66ms
CompilerTSServer - node (v18.10.0, x64)
Req 1 - updateOpen	2,713ms (± 0.98%)	2,713ms (± 0.63%)	0ms ( 0.00%)	2,696ms	2,736ms
Req 2 - geterr	4,055ms (± 0.42%)	4,055ms (± 0.46%)	+1ms (+ 0.02%)	4,032ms	4,076ms
Req 3 - references	367ms (± 0.54%)	368ms (± 0.97%)	+1ms (+ 0.36%)	365ms	375ms
Req 4 - navto	297ms (± 0.72%)	301ms (± 0.75%)	+4ms (+ 1.24%)	298ms	304ms
Req 5 - completionInfo count	1,518 (± 0.00%)	1,518 (± 0.00%)	0 ( 0.00%)	1,518	1,518
Req 5 - completionInfo	80ms (± 7.93%)	82ms (± 0.50%)	+2ms (+ 2.51%)	81ms	82ms
xstateTSServer - node (v18.10.0, x64)
Req 1 - updateOpen	3,489ms (± 0.84%)	3,493ms (± 0.62%)	+3ms (+ 0.10%)	3,472ms	3,532ms
Req 2 - geterr	1,415ms (± 1.01%)	1,414ms (± 0.63%)	-1ms (- 0.06%)	1,404ms	1,425ms
Req 3 - references	104ms (± 1.99%)	104ms (± 1.66%)	+0ms (+ 0.16%)	102ms	106ms
Req 4 - navto	357ms (± 1.84%)	356ms (± 0.35%)	-1ms (- 0.23%)	354ms	357ms
Req 5 - completionInfo count	3,175 (± 0.00%)	3,175 (± 0.00%)	0 ( 0.00%)	3,175	3,175
Req 5 - completionInfo	471ms (± 0.94%)	468ms (± 1.50%)	-3ms (- 0.53%)	459ms	476ms
Compiler-UnionsTSServer - node (v16.17.1, x64)
Req 1 - updateOpen	2,783ms (± 0.25%)	2,772ms (± 0.60%)	-12ms (- 0.43%)	2,748ms	2,795ms
Req 2 - geterr	5,881ms (± 0.49%)	5,875ms (± 0.34%)	-6ms (- 0.09%)	5,852ms	5,901ms
Req 3 - references	376ms (± 1.63%)	377ms (± 1.23%)	+1ms (+ 0.13%)	370ms	384ms
Req 4 - navto	277ms (± 0.66%)	278ms (± 0.81%)	+1ms (+ 0.18%)	274ms	280ms
Req 5 - completionInfo count	1,356 (± 0.00%)	1,356 (± 0.00%)	0 ( 0.00%)	1,356	1,356
Req 5 - completionInfo	74ms (± 4.19%)	77ms (±10.22%)	+3ms (+ 4.31%)	70ms	91ms
CompilerTSServer - node (v16.17.1, x64)
Req 1 - updateOpen	2,932ms (± 0.78%)	2,932ms (± 0.84%)	-0ms (- 0.01%)	2,903ms	2,972ms
Req 2 - geterr	4,393ms (± 0.28%)	4,393ms (± 0.31%)	-1ms (- 0.02%)	4,378ms	4,411ms
Req 3 - references	377ms (± 0.70%)	379ms (± 0.97%)	+3ms (+ 0.66%)	374ms	383ms
Req 4 - navto	288ms (± 0.26%)	288ms (± 0.87%)	-0ms (- 0.06%)	283ms	290ms
Req 5 - completionInfo count	1,518 (± 0.00%)	1,518 (± 0.00%)	0 ( 0.00%)	1,518	1,518
Req 5 - completionInfo	72ms (± 1.14%)	73ms (± 1.12%)	+1ms (+ 1.40%)	72ms	74ms
xstateTSServer - node (v16.17.1, x64)
Req 1 - updateOpen	3,631ms (± 0.44%)	3,632ms (± 0.23%)	+2ms (+ 0.04%)	3,619ms	3,640ms
Req 2 - geterr	1,566ms (± 0.65%)	1,556ms (± 0.85%)	-10ms (- 0.61%)	1,542ms	1,580ms
Req 3 - references	111ms (± 1.44%)	112ms (± 1.10%)	+0ms (+ 0.30%)	110ms	113ms
Req 4 - navto	344ms (± 1.11%)	342ms (± 1.43%)	-2ms (- 0.68%)	338ms	348ms
Req 5 - completionInfo count	3,175 (± 0.00%)	3,175 (± 0.00%)	0 ( 0.00%)	3,175	3,175
Req 5 - completionInfo	484ms (± 1.46%)	478ms (± 0.69%)	-6ms (- 1.31%)	473ms	481ms
Compiler-UnionsTSServer - node (v14.15.1, x64)
Req 1 - updateOpen	2,905ms (± 0.17%)	2,910ms (± 0.52%)	+5ms (+ 0.16%)	2,886ms	2,926ms
Req 2 - geterr	6,249ms (± 0.73%)	6,284ms (± 0.68%)	+35ms (+ 0.56%)	6,210ms	6,341ms
Req 3 - references	389ms (± 0.60%)	392ms (± 0.88%)	+3ms (+ 0.73%)	386ms	396ms
Req 4 - navto	284ms (± 1.19%)	282ms (± 1.83%)	-2ms (- 0.53%)	278ms	291ms
Req 5 - completionInfo count	1,356 (± 0.00%)	1,356 (± 0.00%)	0 ( 0.00%)	1,356	1,356
Req 5 - completionInfo	81ms (± 8.67%)	87ms (± 8.88%)	+5ms (+ 6.35%)	73ms	92ms
CompilerTSServer - node (v14.15.1, x64)
Req 1 - updateOpen	3,091ms (± 0.79%)	3,086ms (± 1.02%)	-6ms (- 0.18%)	3,054ms	3,139ms
Req 2 - geterr	4,687ms (± 0.13%)	4,705ms (± 0.37%)	+17ms (+ 0.37%)	4,678ms	4,730ms
Req 3 - references	405ms (± 0.60%)	405ms (± 0.97%)	+1ms (+ 0.16%)	403ms	413ms
Req 4 - navto	291ms (± 1.06%)	291ms (± 0.85%)	-1ms (- 0.17%)	288ms	295ms
Req 5 - completionInfo count	1,518 (± 0.00%)	1,518 (± 0.00%)	0 ( 0.00%)	1,518	1,518
Req 5 - completionInfo	83ms (± 4.41%)	81ms (± 0.64%)	-2ms (- 2.62%)	80ms	81ms
xstateTSServer - node (v14.15.1, x64)
Req 1 - updateOpen	3,961ms (± 0.77%)	3,982ms (± 0.75%)	+21ms (+ 0.52%)	3,947ms	4,018ms
Req 2 - geterr	1,503ms (± 0.91%)	1,535ms (± 1.79%)	+33ms (+ 2.17%)	1,509ms	1,565ms
Req 3 - references	134ms (± 2.26%)	132ms (± 3.49%)	-2ms (- 1.50%)	126ms	137ms
Req 4 - navto	375ms (± 0.89%)	374ms (± 0.36%)	-0ms (- 0.09%)	373ms	377ms
Req 5 - completionInfo count	3,175 (± 0.00%)	3,175 (± 0.00%)	0 ( 0.00%)	3,175	3,175
Req 5 - completionInfo	510ms (± 1.99%)	502ms (± 2.71%)	-7ms (- 1.44%)	483ms	515ms

System

Machine Name	ts-ci-ubuntu
Platform	linux 5.4.0-135-generic
Architecture	x64
Available Memory	16 GB
Available Memory	15 GB
CPUs	4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Hosts

• node (v18.10.0, x64)
• node (v16.17.1, x64)
• node (v14.15.1, x64)

Scenarios

• Compiler-UnionsTSServer - node (v18.10.0, x64)
• Compiler-UnionsTSServer - node (v16.17.1, x64)
• Compiler-UnionsTSServer - node (v14.15.1, x64)
• CompilerTSServer - node (v18.10.0, x64)
• CompilerTSServer - node (v16.17.1, x64)
• CompilerTSServer - node (v14.15.1, x64)
• xstateTSServer - node (v18.10.0, x64)
• xstateTSServer - node (v16.17.1, x64)
• xstateTSServer - node (v14.15.1, x64)

Benchmark	Name	Iterations
Current	52456	6
Baseline	main	6

Startup

Comparison Report - main..52456

Metric	main	52456	Delta	Best	Worst
tsc-startup - node (v16.17.1, x64)
Execution time	142.20ms (± 0.18%)	142.96ms (± 0.35%)	+0.75ms (+ 0.53%)	141.90ms	146.92ms
tsserver-startup - node (v16.17.1, x64)
Execution time	225.82ms (± 0.19%)	228.82ms (± 0.41%)	+3.00ms (+ 1.33%)	224.84ms	233.65ms
tsserverlibrary-startup - node (v16.17.1, x64)
Execution time	228.34ms (± 0.23%)	231.57ms (± 0.33%)	+3.23ms (+ 1.42%)	227.52ms	237.49ms
typescript-startup - node (v16.17.1, x64)
Execution time	209.31ms (± 0.17%)	212.20ms (± 0.36%)	+2.89ms (+ 1.38%)	208.91ms	221.01ms

System

Machine Name	ts-ci-ubuntu
Platform	linux 5.4.0-135-generic
Architecture	x64
Available Memory	16 GB
Available Memory	15 GB
CPUs	4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Hosts

• node (v16.17.1, x64)

Scenarios

• tsc-startup - node (v16.17.1, x64)
• tsserver-startup - node (v16.17.1, x64)
• tsserverlibrary-startup - node (v16.17.1, x64)
• typescript-startup - node (v16.17.1, x64)

Benchmark	Name	Iterations
Current	52456	6
Baseline	main	6

Developer Information:

Download Benchmark

[RyanCavanaugh]

Thanks!