@netlify/config/src/merge_normalize.js

Netlify config module

import { normalizeConfigCase } from './case.js'
import { normalizeConfig } from './normalize.js'
import { addOrigins } from './origin.js'
import { validateIdenticalPlugins } from './validate/identical.js'
import {
  validatePreCaseNormalize,
  validatePreMergeConfig,
  validatePreNormalizeConfig,
  validatePostNormalizeConfig,
} from './validate/main.js'

// Perform validation and normalization logic to apply to all of:
//  - config, defaultConfig, inlineConfig
//  - context-specific configs
// Therefore, this is performing before merging those together.
export const normalizeBeforeConfigMerge = function (config, origin) {
  validatePreCaseNormalize(config)
  const configA = normalizeConfigCase(config)
  validatePreMergeConfig(configA)
  const configB = addOrigins(configA, origin)
  validateIdenticalPlugins(configB)
  return configB
}

// Validation and normalization logic performed after merging
export const normalizeAfterConfigMerge = function (config) {
  validatePreNormalizeConfig(config)
  const configA = normalizeConfig(config)
  validatePostNormalizeConfig(configA)
  return configA
}