Function mergeWithDefaults

packages/vite/src/node/utils.ts:1234–1241

(defaults: D, values: V)

const environmentPathRE = /^environments\.[^.]+$/

export function mergeWithDefaults<
  D extends Record<string, any>,
  V extends Record<string, any>,
>(defaults: D, values: V): MergeWithDefaultsResult<DeepWritable<D>, V> {
  // NOTE: we need to clone the value here to avoid mutating the defaults
  const clonedDefaults = deepClone(defaults)
  return mergeWithDefaultsRecursively(clonedDefaults, values)
}

const runtimeDeprecatedPath = new Set(['optimizeDeps', 'ssr.optimizeDeps'])
const rollupOptionsDeprecationCall = (() => {