metro-config: Accept functions as arguments to mergeConfig #590

Job	Run time
Type check, lint, smoke test	33s
Tests with coverage	1m 38s
test (macos-latest, lts/-1) / Tests [Node.js lts/-1, macos-latest, Using yarn.lock]	1m 17s
test (macos-latest, lts/) / Tests [Node.js lts/, macos-latest, Using yarn.lock]	1m 11s
test (ubuntu-latest, lts/) / Tests [Node.js lts/, ubuntu-latest, Using yarn.lock]	51s
test (ubuntu-latest, lts/-1) / Tests [Node.js lts/-1, ubuntu-latest, Using yarn.lock]	51s
test (ubuntu-latest, 20.19.4) / Tests [Node.js 20.19.4, ubuntu-latest, Using yarn.lock]	56s
test (macos-latest, latest) / Tests [Node.js latest, macos-latest, Using yarn.lock]	2m 3s
test (windows-latest, lts/-1) / Tests [Node.js lts/-1, windows-latest, Using yarn.lock]	4m 24s
test (ubuntu-latest, latest) / Tests [Node.js latest, ubuntu-latest, Using yarn.lock]	53s
test (windows-latest, 20.19.4) / Tests [Node.js 20.19.4, windows-latest, Using yarn.lock]	2m 38s
test (macos-latest, 20.19.4) / Tests [Node.js 20.19.4, macos-latest, Using yarn.lock]	48s
test (windows-latest, lts/) / Tests [Node.js lts/, windows-latest, Using yarn.lock]	3m 28s
test (windows-latest, latest) / Tests [Node.js latest, windows-latest, Using yarn.lock]	2m 3s
Deploy	0s
	23m 34s

Provide feedback