Move all runtime helpers to individual files #16495
Merged
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Fixes #1, Fixes #2
After this PR, since there is a build step for all helpers, I plan to move
babel/packages/babel-helpers/src/index.ts
Line 42 in 6e3539b
This PR caught a problem with our Babel7/8 integration tests: some tests fail because the helpers are missing (for example, old decorator helpers), but we didn't notice because we where generating those helpers even in Babel 8 mode during the test.