expose signature on SignatureContent #1680

Job	Run time
Lint/build code	31s
Run tests (16.14.0, ubuntu-latest, bash, /tmp/jest)	1m 8s
Run tests (16.14.0, macos-latest-large, bash, /tmp/jest)	1m 28s
Run tests (16.14.0, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 17s
Run tests (16.x, ubuntu-latest, bash, /tmp/jest)	1m 7s
Run tests (16.x, macos-latest-large, bash, /tmp/jest)	1m 24s
Run tests (16.x, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 37s
Run tests (18.17.0, ubuntu-latest, bash, /tmp/jest)	1m 8s
Run tests (18.17.0, macos-latest-large, bash, /tmp/jest)	1m 38s
Run tests (18.17.0, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 23s
Run tests (18.x, ubuntu-latest, bash, /tmp/jest)	1m 13s
Run tests (18.x, macos-latest-large, bash, /tmp/jest)	1m 27s
Run tests (18.x, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	3m 9s
Run tests (20.5.0, ubuntu-latest, bash, /tmp/jest)	1m 7s
Run tests (20.5.0, macos-latest-large, bash, /tmp/jest)	1m 27s
Run tests (20.5.0, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 45s
Run tests (20.x, ubuntu-latest, bash, /tmp/jest)	1m 9s
Run tests (20.x, macos-latest-large, bash, /tmp/jest)	1m 20s
Run tests (20.x, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 59s
	32m 17s

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