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Bump target up to ES2015 #50022

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Bump target up to ES2015 #50022

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jakebailey
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Wanting to see how expensive this turns out to be performance wise, since this brings in let/const.

The two changes are interesting; they're only bugs when there's var. The switch case one is... weird code and I feel like this deserves an error somehow if the target isn't going to lower to var. The other one is a logic bug where we get a key that's undefined because it hasn't been calculated yet, but we can't determine that statically.

@jakebailey
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@typescript-bot perf test this

@typescript-bot typescript-bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Jul 24, 2022
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typescript-bot commented Jul 24, 2022 •
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Heya @jakebailey, I've started to run the perf test suite on this PR at 7753eae. You can monitor the build here.

Update: The results are in!

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The results of the perf run you requested are in!

Here they are:

Compiler

Comparison Report - main..50022
Metric main 50022 Delta Best Worst
Angular - node (v10.16.3, x64)
Memory used 360,143k (± 0.01%) 361,326k (± 0.01%) +1,183k (+ 0.33%) 361,229k 361,417k
Parse Time 2.09s (± 0.62%) 2.26s (± 0.67%) +0.17s (+ 7.98%) 2.23s 2.30s
Bind Time 0.90s (± 1.83%) 0.89s (± 0.65%) -0.01s (- 1.00%) 0.88s 0.91s
Check Time 6.02s (± 0.44%) 6.26s (± 0.39%) +0.24s (+ 4.02%) 6.21s 6.31s
Emit Time 6.14s (± 0.49%) 6.38s (± 0.48%) +0.24s (+ 3.88%) 6.33s 6.46s
Total Time 15.15s (± 0.37%) 15.79s (± 0.27%) +0.64s (+ 4.24%) 15.70s 15.89s
Compiler-Unions - node (v10.16.3, x64)
Memory used 206,931k (± 0.05%) 207,635k (± 0.04%) +704k (+ 0.34%) 207,474k 207,865k
Parse Time 0.83s (± 0.82%) 0.93s (± 0.48%) +0.09s (+11.14%) 0.92s 0.94s
Bind Time 0.53s (± 1.67%) 0.53s (± 1.40%) +0.01s (+ 1.14%) 0.52s 0.55s
Check Time 7.17s (± 0.53%) 7.41s (± 0.26%) +0.23s (+ 3.23%) 7.36s 7.44s
Emit Time 2.49s (± 1.03%) 2.59s (± 0.59%) +0.10s (+ 4.05%) 2.56s 2.62s
Total Time 11.03s (± 0.50%) 11.46s (± 0.25%) +0.43s (+ 3.88%) 11.38s 11.51s
Monaco - node (v10.16.3, x64)
Memory used 343,901k (± 0.01%) 344,329k (± 0.02%) +428k (+ 0.12%) 344,134k 344,519k
Parse Time 1.61s (± 0.60%) 1.72s (± 0.75%) +0.11s (+ 6.95%) 1.70s 1.76s
Bind Time 0.76s (± 0.53%) 0.77s (± 0.62%) +0.01s (+ 0.79%) 0.76s 0.78s
Check Time 6.04s (± 0.23%) 6.17s (± 0.35%) +0.13s (+ 2.15%) 6.10s 6.22s
Emit Time 3.30s (± 0.27%) 3.37s (± 0.71%) +0.06s (+ 1.97%) 3.34s 3.45s
Total Time 11.71s (± 0.25%) 12.02s (± 0.37%) +0.31s (+ 2.67%) 11.92s 12.16s
TFS - node (v10.16.3, x64)
Memory used 305,095k (± 0.02%) 305,448k (± 0.02%) +353k (+ 0.12%) 305,356k 305,547k
Parse Time 1.28s (± 0.69%) 1.39s (± 0.62%) +0.10s (+ 8.10%) 1.37s 1.41s
Bind Time 0.72s (± 0.83%) 0.74s (± 0.70%) +0.02s (+ 3.21%) 0.73s 0.75s
Check Time 5.45s (± 0.46%) 5.63s (± 0.64%) +0.18s (+ 3.32%) 5.57s 5.74s
Emit Time 3.42s (± 1.13%) 3.53s (± 1.05%) +0.11s (+ 3.22%) 3.45s 3.59s
Total Time 10.87s (± 0.49%) 11.29s (± 0.58%) +0.42s (+ 3.84%) 11.17s 11.47s
material-ui - node (v10.16.3, x64)
Memory used 469,350k (± 0.01%) 471,102k (± 0.01%) +1,753k (+ 0.37%) 471,027k 471,191k
Parse Time 1.83s (± 0.60%) 1.96s (± 0.39%) +0.13s (+ 6.83%) 1.94s 1.98s
Bind Time 0.69s (± 1.35%) 0.72s (± 1.06%) +0.03s (+ 4.07%) 0.69s 0.73s
Check Time 14.60s (± 0.67%) 14.77s (± 0.59%) +0.17s (+ 1.19%) 14.46s 14.89s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 17.12s (± 0.55%) 17.44s (± 0.50%) +0.32s (+ 1.89%) 17.13s 17.57s
xstate - node (v10.16.3, x64)
Memory used 578,024k (± 0.01%) 579,144k (± 0.01%) +1,120k (+ 0.19%) 579,062k 579,279k
Parse Time 2.60s (± 0.31%) 2.80s (± 0.34%) +0.19s (+ 7.46%) 2.78s 2.82s
Bind Time 1.03s (± 0.39%) 1.09s (± 0.92%) +0.06s (+ 6.21%) 1.08s 1.13s
Check Time 1.57s (± 0.56%) 1.65s (± 0.44%) +0.08s (+ 4.97%) 1.63s 1.66s
Emit Time 0.07s (± 3.14%) 0.08s (± 0.00%) +0.01s (+12.68%) 0.08s 0.08s
Total Time 5.27s (± 0.28%) 5.61s (± 0.32%) +0.34s (+ 6.36%) 5.57s 5.65s
Angular - node (v12.1.0, x64)
Memory used 337,717k (± 0.01%) 338,921k (± 0.09%) +1,205k (+ 0.36%) 337,767k 339,184k
Parse Time 2.09s (± 0.46%) 2.22s (± 0.93%) +0.12s (+ 5.93%) 2.18s 2.26s
Bind Time 0.86s (± 0.93%) 0.87s (± 0.92%) +0.01s (+ 1.63%) 0.85s 0.89s
Check Time 5.83s (± 0.55%) 5.99s (± 0.57%) +0.15s (+ 2.59%) 5.89s 6.06s
Emit Time 6.40s (± 0.91%) 6.56s (± 0.79%) +0.16s (+ 2.45%) 6.46s 6.68s
Total Time 15.18s (± 0.51%) 15.63s (± 0.51%) +0.45s (+ 2.96%) 15.48s 15.78s
Compiler-Unions - node (v12.1.0, x64)
Memory used 194,588k (± 0.03%) 195,057k (± 0.11%) +470k (+ 0.24%) 194,578k 195,305k
Parse Time 0.83s (± 0.67%) 0.92s (± 1.04%) +0.09s (+10.63%) 0.89s 0.93s
Bind Time 0.55s (± 0.54%) 0.56s (± 0.89%) +0.01s (+ 1.46%) 0.55s 0.57s
Check Time 6.75s (± 0.51%) 6.85s (± 0.30%) +0.10s (+ 1.54%) 6.80s 6.89s
Emit Time 2.54s (± 0.84%) 2.64s (± 1.11%) +0.10s (+ 4.06%) 2.59s 2.73s
Total Time 10.65s (± 0.43%) 10.96s (± 0.31%) +0.31s (+ 2.87%) 10.91s 11.05s
Monaco - node (v12.1.0, x64)
Memory used 326,793k (± 0.05%) 327,498k (± 0.01%) +704k (+ 0.22%) 327,450k 327,580k
Parse Time 1.57s (± 0.64%) 1.70s (± 0.48%) +0.12s (+ 7.88%) 1.68s 1.71s
Bind Time 0.74s (± 1.10%) 0.75s (± 0.80%) +0.00s (+ 0.27%) 0.73s 0.76s
Check Time 5.83s (± 0.36%) 5.96s (± 0.39%) +0.13s (+ 2.26%) 5.92s 6.01s
Emit Time 3.30s (± 0.79%) 3.40s (± 0.63%) +0.10s (+ 3.00%) 3.36s 3.45s
Total Time 11.45s (± 0.32%) 11.81s (± 0.19%) +0.36s (+ 3.11%) 11.74s 11.85s
TFS - node (v12.1.0, x64)
Memory used 289,656k (± 0.06%) 290,190k (± 0.02%) +534k (+ 0.18%) 290,060k 290,276k
Parse Time 1.29s (± 0.50%) 1.40s (± 0.86%) +0.11s (+ 8.46%) 1.37s 1.42s
Bind Time 0.72s (± 1.24%) 0.72s (± 0.65%) +0.00s (+ 0.56%) 0.71s 0.73s
Check Time 5.36s (± 0.38%) 5.50s (± 0.52%) +0.14s (+ 2.69%) 5.44s 5.56s
Emit Time 3.51s (± 1.15%) 3.56s (± 1.26%) +0.04s (+ 1.19%) 3.44s 3.65s
Total Time 10.88s (± 0.49%) 11.18s (± 0.55%) +0.30s (+ 2.74%) 11.01s 11.29s
material-ui - node (v12.1.0, x64)
Memory used 448,368k (± 0.07%) 450,541k (± 0.01%) +2,173k (+ 0.48%) 450,453k 450,617k
Parse Time 1.82s (± 0.59%) 1.94s (± 0.57%) +0.12s (+ 6.37%) 1.92s 1.96s
Bind Time 0.67s (± 0.73%) 0.68s (± 1.07%) +0.00s (+ 0.59%) 0.66s 0.69s
Check Time 13.02s (± 0.54%) 13.17s (± 0.44%) +0.15s (+ 1.12%) 13.02s 13.28s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 15.52s (± 0.47%) 15.79s (± 0.42%) +0.27s (+ 1.73%) 15.63s 15.93s
xstate - node (v12.1.0, x64)
Memory used 543,462k (± 0.01%) 544,729k (± 0.02%) +1,267k (+ 0.23%) 544,552k 545,019k
Parse Time 2.54s (± 0.52%) 2.70s (± 0.39%) +0.16s (+ 6.22%) 2.68s 2.72s
Bind Time 1.02s (± 0.96%) 1.06s (± 0.87%) +0.04s (+ 3.91%) 1.04s 1.08s
Check Time 1.51s (± 0.74%) 1.58s (± 0.52%) +0.07s (+ 4.71%) 1.56s 1.60s
Emit Time 0.07s (± 0.00%) 0.07s (± 4.13%) +0.00s (+ 2.86%) 0.07s 0.08s
Total Time 5.14s (± 0.27%) 5.42s (± 0.21%) +0.28s (+ 5.45%) 5.40s 5.45s
Angular - node (v14.15.1, x64)
Memory used 335,938k (± 0.01%) 336,798k (± 0.01%) +861k (+ 0.26%) 336,745k 336,833k
Parse Time 2.06s (± 0.65%) 2.22s (± 0.82%) +0.16s (+ 7.70%) 2.19s 2.26s
Bind Time 0.90s (± 1.30%) 0.91s (± 0.73%) +0.01s (+ 1.22%) 0.90s 0.93s
Check Time 5.82s (± 0.41%) 5.99s (± 0.62%) +0.17s (+ 2.87%) 5.90s 6.06s
Emit Time 6.38s (± 0.63%) 6.59s (± 1.18%) +0.21s (+ 3.24%) 6.45s 6.76s
Total Time 15.17s (± 0.37%) 15.71s (± 0.72%) +0.54s (+ 3.57%) 15.46s 15.98s
Compiler-Unions - node (v14.15.1, x64)
Memory used 193,129k (± 0.01%) 193,566k (± 0.01%) +437k (+ 0.23%) 193,508k 193,596k
Parse Time 0.85s (± 0.68%) 0.95s (± 0.63%) +0.10s (+11.69%) 0.94s 0.96s
Bind Time 0.57s (± 1.01%) 0.58s (± 1.02%) +0.01s (+ 2.46%) 0.57s 0.60s
Check Time 6.71s (± 0.80%) 6.93s (± 0.64%) +0.22s (+ 3.26%) 6.83s 6.99s
Emit Time 2.49s (± 0.87%) 2.62s (± 0.81%) +0.13s (+ 5.39%) 2.56s 2.66s
Total Time 10.61s (± 0.54%) 11.08s (± 0.40%) +0.47s (+ 4.44%) 11.00s 11.19s
Monaco - node (v14.15.1, x64)
Memory used 325,664k (± 0.01%) 325,903k (± 0.01%) +239k (+ 0.07%) 325,863k 325,949k
Parse Time 1.58s (± 0.48%) 1.68s (± 0.48%) +0.10s (+ 6.54%) 1.66s 1.70s
Bind Time 0.78s (± 0.71%) 0.79s (± 0.86%) +0.01s (+ 1.53%) 0.78s 0.81s
Check Time 5.71s (± 0.46%) 5.85s (± 0.70%) +0.15s (+ 2.63%) 5.77s 5.94s
Emit Time 3.36s (± 0.58%) 3.46s (± 0.96%) +0.11s (+ 3.19%) 3.39s 3.57s
Total Time 11.42s (± 0.36%) 11.79s (± 0.59%) +0.37s (+ 3.25%) 11.63s 11.93s
TFS - node (v14.15.1, x64)
Memory used 288,822k (± 0.01%) 291,044k (± 0.01%) +2,222k (+ 0.77%) 290,998k 291,081k
Parse Time 1.33s (± 1.04%) 1.41s (± 1.17%) +0.08s (+ 6.25%) 1.38s 1.46s
Bind Time 0.77s (± 4.36%) 0.76s (± 0.88%) -0.01s (- 1.82%) 0.75s 0.78s
Check Time 5.36s (± 0.26%) 5.54s (± 0.42%) +0.18s (+ 3.42%) 5.50s 5.59s
Emit Time 3.54s (± 1.81%) 3.62s (± 1.54%) +0.08s (+ 2.35%) 3.44s 3.70s
Total Time 10.99s (± 0.57%) 11.33s (± 0.52%) +0.34s (+ 3.06%) 11.20s 11.44s
material-ui - node (v14.15.1, x64)
Memory used 446,711k (± 0.01%) 448,508k (± 0.00%) +1,796k (+ 0.40%) 448,462k 448,554k
Parse Time 1.88s (± 0.62%) 1.99s (± 0.41%) +0.11s (+ 5.64%) 1.97s 2.00s
Bind Time 0.72s (± 1.23%) 0.73s (± 1.29%) +0.01s (+ 1.10%) 0.71s 0.75s
Check Time 13.18s (± 0.51%) 13.41s (± 0.62%) +0.23s (+ 1.73%) 13.20s 13.52s
Emit Time 0.00s (± 0.00%) 0.00s (± 0.00%) 0.00s ( NaN%) 0.00s 0.00s
Total Time 15.78s (± 0.47%) 16.12s (± 0.51%) +0.34s (+ 2.16%) 15.92s 16.27s
xstate - node (v14.15.1, x64)
Memory used 541,295k (± 0.01%) 541,995k (± 0.00%) +700k (+ 0.13%) 541,943k 542,033k
Parse Time 2.60s (± 0.29%) 2.77s (± 0.29%) +0.17s (+ 6.54%) 2.75s 2.79s
Bind Time 1.15s (± 1.24%) 1.16s (± 0.70%) +0.01s (+ 1.04%) 1.14s 1.18s
Check Time 1.56s (± 0.49%) 1.61s (± 0.66%) +0.05s (+ 3.21%) 1.58s 1.63s
Emit Time 0.07s (± 4.66%) 0.08s (± 0.00%) +0.01s (+ 9.59%) 0.08s 0.08s
Total Time 5.38s (± 0.36%) 5.61s (± 0.29%) +0.24s (+ 4.37%) 5.57s 5.64s
System
Machine Namets-ci-ubuntu
Platformlinux 4.4.0-210-generic
Architecturex64
Available Memory16 GB
Available Memory15 GB
CPUs4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Hosts
  • node (v10.16.3, x64)
  • node (v12.1.0, x64)
  • node (v14.15.1, x64)
Scenarios
  • Angular - node (v10.16.3, x64)
  • Angular - node (v12.1.0, x64)
  • Angular - node (v14.15.1, x64)
  • Compiler-Unions - node (v10.16.3, x64)
  • Compiler-Unions - node (v12.1.0, x64)
  • Compiler-Unions - node (v14.15.1, x64)
  • Monaco - node (v10.16.3, x64)
  • Monaco - node (v12.1.0, x64)
  • Monaco - node (v14.15.1, x64)
  • TFS - node (v10.16.3, x64)
  • TFS - node (v12.1.0, x64)
  • TFS - node (v14.15.1, x64)
  • material-ui - node (v10.16.3, x64)
  • material-ui - node (v12.1.0, x64)
  • material-ui - node (v14.15.1, x64)
  • xstate - node (v10.16.3, x64)
  • xstate - node (v12.1.0, x64)
  • xstate - node (v14.15.1, x64)
Benchmark Name Iterations
Current 50022 10
Baseline main 10

TSServer

Comparison Report - main..50022
Metric main 50022 Delta Best Worst
Compiler-UnionsTSServer - node (v10.16.3, x64)
Req 1 - updateOpen 1,458ms (± 0.74%) 1,569ms (± 0.79%) +111ms (+ 7.58%) 1,551ms 1,603ms
Req 2 - geterr 3,622ms (± 0.89%) 3,732ms (± 0.65%) +110ms (+ 3.05%) 3,680ms 3,782ms
Req 3 - references 277ms (± 0.80%) 292ms (± 1.45%) +15ms (+ 5.45%) 283ms 304ms
Req 4 - navto 233ms (± 0.66%) 242ms (± 1.02%) +9ms (+ 3.64%) 238ms 249ms
Req 5 - completionInfo count 1,355 (± 0.00%) 1,355 (± 0.00%) 0 ( 0.00%) 1,355 1,355
Req 5 - completionInfo 69ms (±11.17%) 106ms (± 2.82%) 🔻+36ms (+52.38%) 99ms 112ms
CompilerTSServer - node (v10.16.3, x64)
Req 1 - updateOpen 1,557ms (± 0.59%) 1,665ms (± 0.39%) +108ms (+ 6.94%) 1,646ms 1,677ms
Req 2 - geterr 2,275ms (± 0.37%) 2,379ms (± 0.50%) +104ms (+ 4.58%) 2,347ms 2,402ms
Req 3 - references 297ms (± 1.39%) 310ms (± 1.10%) +13ms (+ 4.38%) 302ms 318ms
Req 4 - navto 235ms (± 2.26%) 248ms (± 1.67%) +13ms (+ 5.58%) 232ms 252ms
Req 5 - completionInfo count 1,517 (± 0.00%) 1,517 (± 0.00%) 0 ( 0.00%) 1,517 1,517
Req 5 - completionInfo 69ms (± 1.48%) 76ms (± 5.31%) +7ms (+10.56%) 70ms 85ms
xstateTSServer - node (v10.16.3, x64)
Req 1 - updateOpen 2,174ms (± 0.46%) 2,308ms (± 0.59%) +134ms (+ 6.16%) 2,282ms 2,337ms
Req 2 - geterr 773ms (± 0.66%) 815ms (± 0.97%) +41ms (+ 5.33%) 798ms 838ms
Req 3 - references 96ms (± 0.94%) 78ms (± 5.94%) 🟩-18ms (-18.64%) 74ms 96ms
Req 4 - navto 253ms (± 1.08%) 254ms (± 0.71%) +1ms (+ 0.47%) 250ms 257ms
Req 5 - completionInfo count 3,244 (± 0.00%) 3,244 (± 0.00%) 0 ( 0.00%) 3,244 3,244
Req 5 - completionInfo 271ms (± 1.16%) 282ms (± 0.81%) +12ms (+ 4.36%) 278ms 288ms
Compiler-UnionsTSServer - node (v12.1.0, x64)
Req 1 - updateOpen 1,482ms (± 0.48%) 1,584ms (± 0.80%) +102ms (+ 6.86%) 1,559ms 1,622ms
Req 2 - geterr 3,400ms (± 0.65%) 3,498ms (± 0.44%) +98ms (+ 2.88%) 3,470ms 3,531ms
Req 3 - references 263ms (± 0.59%) 270ms (± 1.81%) +7ms (+ 2.66%) 263ms 282ms
Req 4 - navto 203ms (± 0.69%) 208ms (± 1.41%) +6ms (+ 2.71%) 199ms 215ms
Req 5 - completionInfo count 1,355 (± 0.00%) 1,355 (± 0.00%) 0 ( 0.00%) 1,355 1,355
Req 5 - completionInfo 88ms (±12.11%) 100ms (± 5.17%) +12ms (+14.03%) 95ms 120ms
CompilerTSServer - node (v12.1.0, x64)
Req 1 - updateOpen 1,563ms (± 0.55%) 1,653ms (± 0.58%) +90ms (+ 5.78%) 1,630ms 1,672ms
Req 2 - geterr 2,218ms (± 0.54%) 2,304ms (± 0.77%) +86ms (+ 3.88%) 2,254ms 2,334ms
Req 3 - references 274ms (± 0.74%) 283ms (± 1.03%) +9ms (+ 3.25%) 275ms 288ms
Req 4 - navto 213ms (± 0.81%) 220ms (± 2.40%) +7ms (+ 3.05%) 211ms 238ms
Req 5 - completionInfo count 1,517 (± 0.00%) 1,517 (± 0.00%) 0 ( 0.00%) 1,517 1,517
Req 5 - completionInfo 63ms (± 3.12%) 71ms (± 6.03%) +8ms (+13.33%) 63ms 80ms
xstateTSServer - node (v12.1.0, x64)
Req 1 - updateOpen 2,100ms (± 0.65%) 2,210ms (± 0.97%) +109ms (+ 5.20%) 2,177ms 2,268ms
Req 2 - geterr 763ms (± 0.55%) 787ms (± 0.66%) +24ms (+ 3.09%) 771ms 796ms
Req 3 - references 67ms (± 2.04%) 75ms (± 1.11%) +8ms (+11.34%) 72ms 76ms
Req 4 - navto 239ms (± 1.21%) 238ms (± 1.34%) -2ms (- 0.75%) 229ms 243ms
Req 5 - completionInfo count 3,244 (± 0.00%) 3,244 (± 0.00%) 0 ( 0.00%) 3,244 3,244
Req 5 - completionInfo 261ms (± 0.76%) 281ms (± 0.48%) +20ms (+ 7.78%) 279ms 284ms
Compiler-UnionsTSServer - node (v14.15.1, x64)
Req 1 - updateOpen 1,523ms (± 0.48%) 1,635ms (± 0.41%) +112ms (+ 7.35%) 1,617ms 1,648ms
Req 2 - geterr 3,532ms (± 0.66%) 3,654ms (± 0.57%) +122ms (+ 3.44%) 3,617ms 3,698ms
Req 3 - references 278ms (± 0.81%) 285ms (± 1.41%) +7ms (+ 2.52%) 274ms 295ms
Req 4 - navto 218ms (± 0.58%) 225ms (± 0.64%) +7ms (+ 3.07%) 222ms 229ms
Req 5 - completionInfo count 1,355 (± 0.00%) 1,355 (± 0.00%) 0 ( 0.00%) 1,355 1,355
Req 5 - completionInfo 60ms (± 6.59%) 62ms (± 1.87%) +1ms (+ 2.32%) 60ms 66ms
CompilerTSServer - node (v14.15.1, x64)
Req 1 - updateOpen 1,606ms (± 0.73%) 1,727ms (± 0.42%) +121ms (+ 7.56%) 1,714ms 1,747ms
Req 2 - geterr 2,356ms (± 0.32%) 2,430ms (± 0.59%) +74ms (+ 3.16%) 2,395ms 2,450ms
Req 3 - references 289ms (± 1.03%) 293ms (± 0.47%) +5ms (+ 1.56%) 291ms 296ms
Req 4 - navto 232ms (± 1.44%) 247ms (± 1.74%) +16ms (+ 6.74%) 236ms 254ms
Req 5 - completionInfo count 1,517 (± 0.00%) 1,517 (± 0.00%) 0 ( 0.00%) 1,517 1,517
Req 5 - completionInfo 53ms (± 0.98%) 62ms (± 1.25%) +9ms (+16.57%) 60ms 64ms
xstateTSServer - node (v14.15.1, x64)
Req 1 - updateOpen 2,216ms (± 0.45%) 2,336ms (± 0.57%) +120ms (+ 5.42%) 2,296ms 2,370ms
Req 2 - geterr 773ms (± 0.53%) 805ms (± 0.61%) +32ms (+ 4.17%) 796ms 817ms
Req 3 - references 65ms (± 1.78%) 72ms (± 1.22%) +7ms (+11.28%) 71ms 74ms
Req 4 - navto 250ms (± 0.77%) 251ms (± 0.98%) +1ms (+ 0.24%) 245ms 256ms
Req 5 - completionInfo count 3,244 (± 0.00%) 3,244 (± 0.00%) 0 ( 0.00%) 3,244 3,244
Req 5 - completionInfo 265ms (± 0.63%) 281ms (± 0.78%) +16ms (+ 6.20%) 277ms 286ms
System
Machine Namets-ci-ubuntu
Platformlinux 4.4.0-210-generic
Architecturex64
Available Memory16 GB
Available Memory15 GB
CPUs4 × Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Hosts
  • node (v10.16.3, x64)
  • node (v12.1.0, x64)
  • node (v14.15.1, x64)
Scenarios
  • Compiler-UnionsTSServer - node (v10.16.3, x64)
  • Compiler-UnionsTSServer - node (v12.1.0, x64)
  • Compiler-UnionsTSServer - node (v14.15.1, x64)
  • CompilerTSServer - node (v10.16.3, x64)
  • CompilerTSServer - node (v12.1.0, x64)
  • CompilerTSServer - node (v14.15.1, x64)
  • xstateTSServer - node (v10.16.3, x64)
  • xstateTSServer - node (v12.1.0, x64)
  • xstateTSServer - node (v14.15.1, x64)
Benchmark Name Iterations
Current 50022 10
Baseline main 10

Developer Information:

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@jakebailey
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nooooo

@jakebailey
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Wish we had node 16 and 18 to test...

@jakebailey
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And that we had an esbuild-like thing to say "emit all new stuff but... downlevel to var anyway"

@Andarist
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@jakebailey out of curiosity - why let/const are the likely culprits here? Does TDZ come with such a cost? or perhaps just a matter of block scoping having such an overhead (there are more scopes created/maintained)?

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I'm guessing this is TDZ, yeah, I just haven't actually gone to compare traces to see if there's any obvious culprits.

@DanielRosenwasser
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DanielRosenwasser commented Jul 26, 2022 •
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I would guess that two culprits are

  • TDZ
  • Native iteration and generators

This was referenced Aug 2, 2022
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@jakebailey jakebailey mentioned this pull request Sep 19, 2022
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The code that I used to fix the crashes has been merged in #50151; I'm going to close this since it seems like we're not going to change our emit target any time soon as the performance hit of let/const is just too great.

See also #49332 (comment).

@jakebailey jakebailey closed this Sep 19, 2022
@jakebailey jakebailey deleted the update-target branch October 20, 2022 17:24
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@jakebailey @typescript-bot @Andarist @DanielRosenwasser