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;
}

declare module "@babel/code-frame" {
  declare type Location = {
    column: number,
    line: number,
  };
  declare type NodeLocation = {
    end?: Location,
    start: Location,
  };
  declare export interface Options {
    /**
     * Syntax highlight the code as JavaScript for terminals. default: false
     */
    highlightCode?: boolean;

    /**
     * The number of lines to show above the error. default: 2
     */
    linesAbove?: number;

    /**
     * The number of lines to show below the error. default: 3
     */
    linesBelow?: number;

    /**
     * Forcibly syntax highlight the code as JavaScript (for non-terminals);
     * overrides highlightCode.
     * default: false
     */
    forceColor?: boolean;

    /**
     * Pass in a string to be displayed inline (if possible) next to the
     * highlighted location in the code. If it can't be positioned inline,
     * it will be placed above the code frame.
     * default: nothing
     */
    message?: string;
  }
  declare export function codeFrameColumns(
    rawLines: string,
    loc: NodeLocation,
    opts?: Options
  ): string;

  /**
   * Create a code frame, adding line numbers, code highlighting, and pointing to a given position.
   */
  declare export default function codeFrame(
    rawLines: string,
    lineNumber: number,
    colNumber?: number | null,
    opts?: Options
  ): string;
}

declare module "@babel/helper-validator-identifier" {
  declare function isReservedWord(word: string, inModule: boolean): boolean;
  declare function isStrictReservedWord(
    word: string,
    inModule: boolean
  ): boolean;
  declare function isStrictBindOnlyReservedWord(word: string): boolean;
  declare function isStrictBindReservedWord(
    word: string,
    inModule: boolean
  ): boolean;
  declare function isKeyword(word: string): boolean;
  declare function isIdentifierStart(code: number): boolean;
  declare function isIdentifierChar(code: number): boolean;
  declare function isIdentifierName(name: string): boolean;
}

declare module "@babel/helper-validator-option" {
  declare class OptionValidator {
    descriptor: string;
    constructor(descriptor: string): OptionValidator;
    validateTopLevelOptions(options: Object, TopLevelOptionShape: Object): void;
    validateBooleanOption<T>(
      name: string,
      value?: boolean,
      defaultValue?: T
    ): boolean | T;
    validateStringOption<T>(
      name: string,
      value?: string,
      defaultValue?: T
    ): string | T;
    invariant(condition: boolean, message: string): void;
    formatMessage(message: string): string;
  }
  declare function findSuggestion(
    str: string,
    arr: $ReadonlyArray<string>
  ): string;
}

declare module "@babel/helper-function-name" {
  declare export default function helperFunctionNamefunction(
    options: any,
    localBinding?: boolean
  ): any;
}

declare module "@babel/helper-split-export-declaration" {
  declare export default function splitExportDeclaration(exportDeclaration: any): any;
}

declare module "@babel/traverse" {
  declare module.exports: any;
}

declare module "@babel/generator" {
  declare module.exports: any;
}

declare module "@babel/highlight" {
  import typeof { Chalk } from "chalk";
  declare type Options = {
    forceColor?: boolean,
  };

  /**
   * Whether the code should be highlighted given the passed options.
   */
  declare function shouldHighlight(options: Options): boolean;

  /**
   * The Chalk instance that should be used given the passed options.
   */
  declare function getChalk(options: Options): Chalk;

  /**
   * Highlight `code`.
   */
  declare export default function highlight(code: string, options?: Options): string;
    declare export { getChalk, shouldHighlight };
}