2.3.4 • Public • Published

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    Automatically create TypeScript barrels for your entire code base.

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    About Barrels

    Barrels are files that rollup exports from several modules into a single convenient module typically named index.ts. They tend to help simplify large blocks of import statements at the top of files and help to group up related functionality.

    A barrel file looks like this:

    export * from "./DropDown";
    export * from "./TextBox";
    export * from "./CheckBox";
    export * from "./DateTimePicker";
    export * from "./Slider";

    It can help you go from messy imports like this:

    import {DropDown} from "./src/controls/DropDown";
    import {TextBox} from "./src/controls/TextBox";
    import {CheckBox} from "./src/controls/CheckBox";
    import {DateTimePicker} from "./src/controls/DateTimePicker";
    import {Slider} from "./src/controls/Slider"; something tidier like this:

    import {DropDown, TextBox, CheckBox, DateTimePicker, Slider} from "./src/controls";

    ...or even this:

    import * as Controls from "./src/controls/index";

    More Reading

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    To install Barrelsby:

    npm install --save-dev barrelsby

    To run barrelsby first add a script to the package.json file:

      "scripts": {
        "generate-barrels": "barrelsby --delete"

    You can now generate barrels:

    npm run generate-barrels

    Configuration Options

    Barrelsby accepts a number of options to help refine how your barrels are created. These options can be configured from the command line or using a configuration file.

    -c [path] or --config [path]

    Specifies the location of the barrelsby configuration file. This file must be a .json file. You can include any of the configuration options using their long name.

    -d [path...] or --directory [path...]

    Specifies a list of root directories where barrels will be created from. Uses the current directory by default.

    Note: This is backwards compatible with previous versions. Existing configuration files will be parsed correctly. The following two json files will behave identically.

      "directory": "./src"
      "directory": ["./src"]

    -D or --delete

    Deletes any existing barrels encountered by barrelsby. Disabled by default.

    -e [regex...] or --exclude [regex...]

    Excludes any files whose paths match any of the specified regular expressions.

    -E or --exportDefault

    Also export the default export of the file. Currently works only with the flat mode.

    export * from "./barrel";
    export { default as barrel } from "./barrel";

    -H or --help

    Displays help information on the command line arguments that barrelsby accepts.

    -i [regex...] or --include [regex...]

    Only include files whose paths match any of the specified regular expressions.

    -l [mode] or --location [mode]

    The mode that barrelsby should use to determine where which directories to create barrels in. Defaulted to top.

    • top only creates a barrel in the target directory.
    • below creates a barrel in every directory just below the target directory.
    • all creates a barrel in every directory below (and including) the target directory.
    • replace only creates barrels in directories where one already existed.
    • branch creates a barrel in every directory that contains other directories.

    -L or --local

    Enable this to prevent barrels including modules that exist in the same directory, rather than recursively searching child directories.

    -n [name] or --name [name]

    Specifies the name to use for creating new barrels (and identifying old ones). .ts wil be appended if not included in the name. Barrels names will be defaulted to index.ts.

    -s [mode] or --structure [mode]

    The structure that barrelsby should create inside the barrels. Defaulted to flat.


    Exports modules without any nesting.

    export * from "./barrel";
    export * from "./index";
    export * from "./directory2/script";
    export * from "./directory2/directory4/deeplyNested";
    export * from "./directory3/program";


    Exports modules as a nested structure that matches the file system directories.

    import * as barrelts from "./barrel";
    import * as directory2directory4deeplyNestedts from "./directory2/directory4/deeplyNested";
    import * as directory2scriptts from "./directory2/script";
    import * as directory3programts from "./directory3/program";
    import * as indexts from "./index";
    export {barrelts as barrel};
    export const directory2 = {
      directory4: {
        deeplyNested: directory2directory4deeplyNestedts,
      script: directory2scriptts,
    export const directory3 = {
      program: directory3programts,
    export {indexts as index};

    -q or --singleQuotes

    Use 'single quotes' in the generated barrel files instead of the default "double quotes".

    -S or --noSemicolon

    Omit semicolons from the end of lines in the generated barrel files.

    -v or --version

    Display the barrelsby version number.

    -V or --verbose

    Display additional debug information.


    Requires node v6.0.0 or greater for ES6 syntax.




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