expose signature on SignatureContent (#922) #1681

Job	Run time
Lint/build code	33s
Run tests (16.14.0, ubuntu-latest, bash, /tmp/jest)	1m 13s
Run tests (16.14.0, macos-latest-large, bash, /tmp/jest)	1m 37s
Run tests (16.14.0, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 12s
Run tests (16.x, ubuntu-latest, bash, /tmp/jest)	1m 12s
Run tests (16.x, macos-latest-large, bash, /tmp/jest)	1m 27s
Run tests (16.x, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 4s
Run tests (18.17.0, ubuntu-latest, bash, /tmp/jest)	1m 10s
Run tests (18.17.0, macos-latest-large, bash, /tmp/jest)	1m 34s
Run tests (18.17.0, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 46s
Run tests (18.x, ubuntu-latest, bash, /tmp/jest)	1m 6s
Run tests (18.x, macos-latest-large, bash, /tmp/jest)	1m 19s
Run tests (18.x, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 48s
Run tests (20.5.0, ubuntu-latest, bash, /tmp/jest)	1m 12s
Run tests (20.5.0, macos-latest-large, bash, /tmp/jest)	1m 35s
Run tests (20.5.0, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 7s
Run tests (20.x, ubuntu-latest, bash, /tmp/jest)	1m 0s
Run tests (20.x, macos-latest-large, bash, /tmp/jest)	1m 14s
Run tests (20.x, windows-latest, cmd, C:\\Users\\runneradmin\\AppData\\Local\\Temp\\jest)	2m 9s
	30m 18s

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