Function warnDeprecation

packages/compiler-core/src/compat/compatConfig.ts:130–149

(
  key: CompilerDeprecationTypes,
  context: MergedParserOptions | TransformContext,
  loc: SourceLocation | null,
  ...args: any[]
)

}

export function warnDeprecation(
  key: CompilerDeprecationTypes,
  context: MergedParserOptions | TransformContext,
  loc: SourceLocation | null,
  ...args: any[]
): void {
  const val = getCompatValue(key, context)
  if (val === 'suppress-warning') {
    return
  }
  const { message, link } = deprecationData[key]
  const msg = `(deprecation ${key}) ${
    typeof message === 'function' ? message(...args) : message
  }${link ? `\n  Details: ${link}` : ``}`

  const err = new SyntaxError(msg) as CompilerError
  err.code = key
  if (loc) err.loc = loc
  context.onWarn(err)
}