1 files changed, 158 insertions, 0 deletions
diff --git a/node_modules/hullabaloo-config-manager/lib/reduceChains.js b/node_modules/hullabaloo-config-manager/lib/reduceChains.js
new file mode 100644
index 000000000..33d4de881
--- /dev/null
+++ b/node_modules/hullabaloo-config-manager/lib/reduceChains.js
@@ -0,0 +1,158 @@
+'use strict'
+
+const cloneDeepWith = require('lodash.clonedeepwith')
+const merge = require('lodash.merge')
+
+const resolvePluginsAndPresets = require('./resolvePluginsAndPresets')
+
+function trackDependency (dependencies, filename, fromPackage, envName) {
+  if (dependencies.has(filename)) {
+    const existing = dependencies.get(filename)
+    if (envName) {
+      existing.envs.add(envName)
+    } else {
+      existing.default = true
+    }
+    return
+  }
+
+  const item = {
+    default: !envName,
+    envs: new Set(envName ? [envName] : []),
+    filename,
+    fromPackage
+  }
+  dependencies.set(filename, item)
+}
+
+function trackSource (sources, source, envName) {
+  if (sources.has(source)) {
+    const existing = sources.get(source)
+    if (envName) {
+      existing.envs.add(envName)
+    } else {
+      existing.default = true
+    }
+    return
+  }
+
+  const item = {
+    default: !envName,
+    envs: new Set(envName ? [envName] : []),
+    source
+  }
+  sources.set(source, item)
+}
+
+function createOptions (plugins, presets) {
+  const options = {}
+  if (plugins) options.plugins = plugins
+  // istanbul ignore else
+  if (presets) options.presets = presets
+  return options
+}
+
+function compressOptions (orderedOptions) {
+  const remaining = orderedOptions.slice(0, 1)
+  remaining[0].babelrc = false
+
+  for (let index = 1; index < orderedOptions.length; index++) {
+    const options = orderedOptions[index]
+    delete options.babelrc
+
+    const plugins = options.plugins
+    delete options.plugins
+
+    const presets = options.presets
+    delete options.presets
+
+    merge(remaining[0], options)
+
+    if (plugins || presets) {
+      remaining.push(createOptions(plugins, presets))
+    }
+  }
+
+  return remaining
+}
+
+function reduceOptions (chain, envName, pluginsAndPresets, dependencies, sources, fixedSourceHashes) {
+  let json5 = false
+
+  const orderedOptions = Array.from(chain, config => {
+    trackSource(sources, config.source, envName)
+    if (config.hash) {
+      fixedSourceHashes.set(config.source, config.hash)
+    }
+
+    if (config.json5) json5 = true
+
+    const lookup = pluginsAndPresets.get(config)
+    const mapPluginOrPreset = (getEntry, ref) => {
+      if (Array.isArray(ref)) {
+        return ref.length === 1
+          ? mapPluginOrPreset(getEntry, ref[0])
+          : [mapPluginOrPreset(getEntry, ref[0]), ref[1]]
+      }
+
+      const entry = getEntry(ref)
+      trackDependency(dependencies, entry.filename, entry.fromPackage, envName)
+      return entry.filename
+    }
+
+    return cloneDeepWith(config.options, (value, key, object) => {
+      if (object === config.options && (key === 'plugins' || key === 'presets')) {
+        const getEntry = ref => lookup[key].get(ref)
+        return Array.isArray(value)
+          ? value.map(ref => mapPluginOrPreset(getEntry, ref))
+          : []
+      }
+    })
+  })
+
+  const unflattenedOptions = compressOptions(orderedOptions)
+  unflattenedOptions.json5 = json5
+  return unflattenedOptions
+}
+
+function reduceChains (chains, cache) {
+  const pluginsAndPresets = resolvePluginsAndPresets(chains, cache)
+
+  const dependencies = new Map()
+  const envNames = new Set()
+  const fixedSourceHashes = new Map()
+  const sources = new Map()
+
+  const unflattenedDefaultOptions = reduceOptions(
+    chains.defaultChain, null, pluginsAndPresets, dependencies, sources, fixedSourceHashes
+  )
+
+  const unflattenedEnvOptions = new Map()
+  for (const pair of chains.envChains) {
+    const envName = pair[0]
+    const chain = pair[1]
+
+    envNames.add(envName)
+    unflattenedEnvOptions.set(
+      envName,
+      reduceOptions(chain, envName, pluginsAndPresets, dependencies, sources, fixedSourceHashes)
+    )
+  }
+
+  return {
+    dependencies:
+      Array.from(dependencies.keys())
+        .sort()
+        .map(filename => dependencies.get(filename)),
+    envNames,
+    fixedSourceHashes,
+    sources:
+      Array.from(sources.keys())
+        .sort()
+        .map(source => sources.get(source)),
+    unflattenedDefaultOptions,
+    unflattenedEnvOptions
+  }
+}
+
+module.exports = reduceChains