`build-config-chain.js` creates an array of options which will be passed to `OptionsManager#mergeOptions`. The advantage of separating it out is that `build-config-chain` has a very minimal dependency list. The eventual intent is to allow the require hook to lazy load only when required. In other words, if no required files ever match the patterns `ignore` / `only` patterns, the bulk of babel-core, and the associated plugins, will never be loaded.
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