declare module "@babel/template" {
  declare type PublicOpts = {
    placeholderWhitelist?: ?Set<string>,
    placeholderPattern?: ?(RegExp | false),
    preserveComments?: ?boolean,
    syntacticPlaceholders?: ?boolean,
  };

  declare type PublicReplacements = { [string]: mixed } | Array<mixed>;

  declare type TemplateBuilder<T> = {
    ast: {
      (tpl: string, opts: ?PublicOpts): T,
      (tpl: Array<string>, ...args: Array<mixed>): T,
    },
    (opts: PublicOpts): TemplateBuilder<T>,
    (tpl: string, opts: ?PublicOpts): (?PublicReplacements) => T,
    (tpl: Array<string>, ...args: Array<mixed>): (?PublicReplacements) => T,
  };

  declare type Smart = TemplateBuilder<
    Array<BabelNodeStatement> | BabelNodeStatement
  >;
  declare type Statement = TemplateBuilder<BabelNodeStatement>;
  declare type Statements = TemplateBuilder<Array<BabelNodeStatement>>;
  declare type Expression = TemplateBuilder<BabelNodeExpression>;
  declare type Program = TemplateBuilder<BabelNodeProgram>;

  declare export default Smart & {
    smart: Smart,
    statement: Statement,
    statements: Statements,
    expression: Expression,
    program: Program,
  };
}

declare module "@babel/helper-optimise-call-expression" {
  declare export default function optimiseCallExpression(
    callee: BabelNodeExpression,
    thisNode: BabelNodeExpression,
    args: $Readonly<Array<BabelNodeExpression | BabelNodeSpreadElement>>,
    optional: boolean
  ): BabelNodeCallExpression | BabelNodeOptionalCallExpression;
}

declare module "@babel/helper-get-function-arity" {
  declare export default function helperGetFunctionArity(
    node: BabelNodeFunction
  ): number;
}

declare module "@babel/helper-annotate-as-pure" {
  declare export default function annotateAsPure(
    pathOrNode:
      | BabelNode
      | {
          node: BabelNode,
        }
  ): void;
}