fix typings and simlify booleanify #2201

Job	Run time
Prepare Cache	20s
Build Babel Artifacts on Windows	1m 46s
test262 - Prepare for running in parallel	0s
Test ESM version	2m 9s
Build Babel 8 Artifacts	5m 48s
Build Babel Artifacts	1m 26s
Test on Node.js Latest	2m 50s
Validate Yarn dependencies and constraints	30s
Lint	5m 6s
Third-party Parser Tests	1m 35s
Test @babel/eslint-* with ESLint 8.0.0	29s
Test @babel/eslint-* with ESLint 7.5.0	30s
Test @babel/runtime integrations	1m 15s
Test on Node.js (20)	1m 34s
Test on Node.js (18)	1m 34s
Test on (windows-latest)	2m 16s
Test on Node.js (16)	1m 48s
test262	0s
Test on (macos-latest)	1m 16s
Test on Node.js (14)	1m 50s
Test on Node.js (12)	1m 54s
Test on Node.js (10)	2m 37s
Test on Node.js (8)	3m 21s
Test on Node.js (6)	4m 25s
test262 - Analyze results	0s
Test Babel 8 breaking changes on (ubuntu-latest)	1m 40s
Test Babel 8 breaking changes on (windows-latest)	2m 32s
Test Babel 8 breaking changes on (macos-latest)	1m 26s
	51m 57s

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