All files / compiler-sfc/src warn.ts

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const hasWarned: Record<string, boolean> = {}
 
export function warnOnce(msg: string) {
  const isNodeProd =
    typeof process !== 'undefined' && process.env.NODE_ENV === 'production'
  Iif (!isNodeProd && !__TEST__ && !hasWarned[msg]) {
    hasWarned[msg] = true
    warn(msg)
  }
}
 
export function warn(msg: string) {
  console.warn(
    `\x1b[1m\x1b[33m[@vue/compiler-sfc]\x1b[0m\x1b[33m ${msg}\x1b[0m\n`
  )
}