Function hoistSelectors

packages/icu-messageformat-parser/manipulator.ts:142–157

(
  ast: MessageFormatElement[]
)

 * @param ast AST
 */
export function hoistSelectors(
  ast: MessageFormatElement[]
): MessageFormatElement[] {
  for (let i = 0; i < ast.length; i++) {
    const el = ast[i]
    if (isPluralOrSelectElement(el)) {
      return [hoistPluralOrSelectElement(ast, el, i)]
    }
    if (isTagElement(el) && findPluralOrSelectElement([el])) {
      throw new Error(
        'Cannot hoist plural/select within a tag element. Please put the tag element inside each plural/select option'
      )
    }
  }
  return ast
}

/**
 * Collect all variables in an AST to Record<string, TYPE>