fix tsc deprecation complaint for 'ES3'
#314
| Job | Run time |
|---|---|
| 2m 45s | |
| 2m 57s | |
| 1m 48s | |
| 2m 56s | |
| 2m 40s | |
| 1m 26s | |
| 1m 29s | |
| 1m 22s | |
| 1m 37s | |
| 1m 30s | |
| 2m 19s | |
| 2m 29s | |
| 2m 43s | |
| 2m 16s | |
| 2m 23s | |
| 32m 40s |