yarn test fails with error from Terser

[felixpalmer]

Description

Running yarn test leads to the following error message:

1..5272
# tests 5272
# pass  5272

# ok

browser-driver: Browser Test completed in 385.7s.
browser-driver: Browser Test successful: All tests passed

Automatically collecting metrics for deck.gl-monorepo

| Version        | Dist | Bundle Size      | Compressed     | Imports   |
| ---            | ---  | ---              | ---            | ---       |

ERROR in size.js from Terser
Unexpected token: punc (.) [size.js:50278,38]
wc: *: open: No such file or directory
gzip: can't stat: * (*): No such file or directory
wc: *.gz: open: No such file or directory
rm: *.gz: No such file or directory
| 8.5.0-alpha.5 | es5  |  KB  |  KB     | *

ERROR in size.js from Terser
Unexpected token: punc (.) [size.js:31584,38]
wc: *: open: No such file or directory
gzip: can't stat: * (*): No such file or directory
wc: *.gz: open: No such file or directory
rm: *.gz: No such file or directory
| 8.5.0-alpha.5 | esm  |  KB  |  KB     | *

ERROR in size.js from Terser
Unexpected token: punc (.) [size.js:30169,38]
wc: *: open: No such file or directory
gzip: can't stat: * (*): No such file or directory
wc: *.gz: open: No such file or directory
rm: *.gz: No such file or directory
| 8.5.0-alpha.5 | es6  |  KB  |  KB     | *
✨  Done in 468.60s.

All the tests pass OK and running yarn test fast and yarn test ci is without problems.

Expected Behavior

yarn test completes without an error

Repro Steps

• Check our master branch into clean directory
• run yarn
• run yarn test

Environment

• Framework Version: 8.5.0-alpha.5
• Browser Version: -- (invoked using CLI)
• OS: Mac OS X 10.14.4, node

Things tried

• Reinstalling node & npm & yarn
• Manually upgrading webpack to 4.46.0 and terser-webpack-plugin to 1.4.5 (latest versions)

[Pessimistress]

Yes metrics reporting emits error and it should be fixed. But it doesn't make yarn test fail.

[Pessimistress]

Tracking with uber-web/ocular#362