Function validateCompatConfig

packages/runtime-core/src/compat/compatConfig.ts:516–552

(
  config: CompatConfig,
  instance?: ComponentInternalInstance,
)

// dev only
export function validateCompatConfig(
  config: CompatConfig,
  instance?: ComponentInternalInstance,
): void {
  if (seenConfigObjects.has(config)) {
    return
  }
  seenConfigObjects.add(config)

  for (const key of Object.keys(config)) {
    if (
      key !== 'MODE' &&
      !(key in deprecationData) &&
      !(key in warnedInvalidKeys)
    ) {
      if (key.startsWith('COMPILER_')) {
        if (isRuntimeOnly()) {
          warn(
            `Deprecation config "${key}" is compiler-specific and you are ` +
              `running a runtime-only build of Vue. This deprecation should be ` +
              `configured via compiler options in your build setup instead.\n` +
              `Details: https://v3-migration.vuejs.org/breaking-changes/migration-build.html`,
          )
        }
      } else {
        warn(`Invalid deprecation config "${key}".`)
      }
      warnedInvalidKeys[key] = true
    }
  }

  if (instance && config[DeprecationTypes.OPTIONS_DATA_MERGE] != null) {
    warn(
      `Deprecation config "${DeprecationTypes.OPTIONS_DATA_MERGE}" can only be configured globally.`,
    )
  }
}

export function getCompatConfigForKey(
  key: DeprecationTypes | 'MODE',