Fix transform flags for certain ES2020 features.

[DanielRosenwasser]

It doesn't matter because these don't get downleveled; but it is technically more correct.

It does mean we won't perform any ES2021+ transforms when we see these constructs though.

[DanielRosenwasser]

@typescript-bot perf test this faster

[typescript-bot]

Heya @DanielRosenwasser, I've started to run the abridged perf test suite on this PR at 28c4ee6. You can monitor the build here.

Update: The results are in!

[typescript-bot]

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

Here they are:

Comparison Report - main..52445

Metric	main	52445	Delta	Best	Worst
Angular - node (v16.17.1, x64)
Memory used	359,216k (± 0.01%)	359,208k (± 0.01%)	-8k (- 0.00%)	359,172k	359,228k
Parse Time	4.19s (± 0.25%)	4.18s (± 0.36%)	-0.00s (- 0.04%)	4.16s	4.20s
Bind Time	1.23s (± 0.68%)	1.22s (± 0.62%)	-0.00s (- 0.27%)	1.21s	1.23s
Check Time	9.38s (± 0.57%)	9.38s (± 0.41%)	+0.00s (+ 0.02%)	9.33s	9.44s
Emit Time	8.08s (± 0.47%)	8.07s (± 0.45%)	-0.00s (- 0.04%)	8.01s	8.11s
Total Time	22.87s (± 0.35%)	22.86s (± 0.33%)	-0.01s (- 0.04%)	22.77s	22.96s
Compiler-Unions - node (v16.17.1, x64)
Memory used	194,253k (± 0.06%)	194,828k (± 0.74%)	+575k (+ 0.30%)	194,174k	197,774k
Parse Time	1.80s (± 0.55%)	1.80s (± 0.57%)	+0.00s (+ 0.09%)	1.79s	1.82s
Bind Time	0.84s (± 0.97%)	0.85s (± 1.22%)	+0.00s (+ 0.40%)	0.84s	0.86s
Check Time	10.41s (± 1.08%)	10.40s (± 0.49%)	-0.01s (- 0.13%)	10.32s	10.46s
Emit Time	3.06s (± 0.70%)	3.06s (± 0.76%)	-0.00s (- 0.16%)	3.02s	3.09s
Total Time	16.12s (± 0.70%)	16.11s (± 0.41%)	-0.01s (- 0.06%)	16.05s	16.21s
Monaco - node (v16.17.1, x64)
Memory used	343,270k (± 0.01%)	343,239k (± 0.01%)	-31k (- 0.01%)	343,190k	343,295k
Parse Time	3.19s (± 1.22%)	3.17s (± 0.89%)	-0.02s (- 0.47%)	3.14s	3.22s
Bind Time	1.11s (± 0.68%)	1.11s (± 0.37%)	0.00s ( 0.00%)	1.11s	1.12s
Check Time	7.70s (± 0.36%)	7.73s (± 0.36%)	+0.03s (+ 0.43%)	7.71s	7.78s
Emit Time	4.53s (± 0.67%)	4.54s (± 0.27%)	+0.01s (+ 0.26%)	4.53s	4.56s
Total Time	16.53s (± 0.33%)	16.56s (± 0.21%)	+0.03s (+ 0.20%)	16.51s	16.61s
TFS - node (v16.17.1, x64)
Memory used	299,762k (± 0.00%)	299,755k (± 0.00%)	-7k (- 0.00%)	299,742k	299,773k
Parse Time	2.48s (± 1.59%)	2.48s (± 1.19%)	0.00s ( 0.00%)	2.44s	2.50s
Bind Time	1.25s (± 0.65%)	1.25s (± 0.44%)	+0.00s (+ 0.13%)	1.25s	1.26s
Check Time	7.17s (± 0.36%)	7.17s (± 0.35%)	+0.00s (+ 0.00%)	7.13s	7.20s
Emit Time	4.21s (± 0.47%)	4.23s (± 0.50%)	+0.02s (+ 0.36%)	4.20s	4.25s
Total Time	15.12s (± 0.47%)	15.13s (± 0.30%)	+0.02s (+ 0.10%)	15.07s	15.21s
material-ui - node (v16.17.1, x64)
Memory used	476,075k (± 0.02%)	476,037k (± 0.02%)	-39k (- 0.01%)	475,977k	476,196k
Parse Time	3.72s (± 0.33%)	3.72s (± 0.43%)	+0.00s (+ 0.04%)	3.69s	3.73s
Bind Time	1.02s (± 0.74%)	1.02s (± 0.40%)	-0.00s (- 0.33%)	1.01s	1.02s
Check Time	18.12s (± 0.12%)	18.09s (± 0.17%)	-0.03s (- 0.18%)	18.06s	18.14s
Emit Time	0.00s (± 0.00%)	0.00s (± 0.00%)	0.00s ( NaN%)	0.00s	0.00s
Total Time	22.86s (± 0.13%)	22.83s (± 0.20%)	-0.03s (- 0.12%)	22.77s	22.90s
xstate - node (v16.17.1, x64)
Memory used	546,281k (± 0.01%)	546,288k (± 0.02%)	+8k (+ 0.00%)	546,204k	546,457k
Parse Time	4.75s (± 0.35%)	4.75s (± 0.41%)	-0.00s (- 0.04%)	4.74s	4.79s
Bind Time	1.81s (± 3.74%)	1.81s (± 3.94%)	+0.01s (+ 0.37%)	1.67s	1.86s
Check Time	2.99s (± 2.91%)	3.00s (± 2.85%)	+0.00s (+ 0.11%)	2.95s	3.17s
Emit Time	0.10s (± 5.34%)	0.09s (± 4.45%)	🟩-0.01s (- 5.17%)	0.09s	0.10s
Total Time	9.65s (± 0.35%)	9.66s (± 0.42%)	+0.01s (+ 0.07%)	9.62s	9.70s

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

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

Benchmark	Name	Iterations
Current	52445	6
Baseline	main	6

Developer Information:

Download Benchmark

[sandersn]

@DanielRosenwasser is this worth taking for 5.1?

@rbuckton @navya9singh want to review this?