Barro NPM | npm.io

barro

Flexible barrel file generation for Javascript and Typescript with watching built-in.

Usage

Define your barrels in ./barro.js:

module.exports = () => [
  {
    out: "src/models/index.ts",
    match: "**/*Model.ts",
  },
  {
    out: "src/fns/index.ts",
    match: "**/*.ts",
  },
];

Build barrels once:

npx barro --write

Build barrels and rebuild when relevant files are added or removed:

npx barro --write --watch

Alternatively, you can pass the path of your barro config file:

npx barro barrel-config.js --write --watch

Alternatively, you can define your barro config in your package.json as barro:

npx barro package.json --write --watch

Config

out - The path the barrel file should be written to.
match - The glob or array of globs to use when searching for files to include in the barrel.
matchDirectory - The root directory to use when searching for files. Default: path.parse(out).dir
matchIgnore - The optional array of globs to ignore when seaching for files. Default: [out, "**/*.test.*"]
template - The handlebars template string or function to use when generating barrel files. Defaults to export * from "./file/path"; for every matched file.
ignoreBarrels - Whether or not to ignore index.* files. Defaults to true.
ignoreTests - Whether or not to ignore *.test.* and *.spec.* files. Defaults to true.
banner - The banner comment placed at the top of the output barrel file. Defaults to a "do not edit" message.

Custom templates

You can include custom barrel templates in your barrel config file using the template field. The template can be either a handlebars template string or a function that returns a string. Custom templates are provided a files input with these fields:

{
  relativePath: string;
  absolutePath: string;
  path: string;
  name: string;
}

Custom handlebars template

You can use handlebars templates to generate custom barrels:

const { readFileSync } = require("fs");

module.exports = ({ Handlebars }) => {
  Handlebars.registerHelper("loud", (str) => str.toUpperCase());

  return [
    {
      out: "src/models/index.ts",
      match: "**/*Model.ts",
      template: fs.readFileSync("./modelBarrel.hbs", "utf8"),
    },
  ];
};

Custom function template

You can use plain JS functions to generate custom barrels:

module.exports = () => [
  {
    out: "src/models/index.ts",
    match: "**/*Model.ts",
    template({ files }) {
      return files
        .map(
          (file) =>
            `export { default as ${file.name.toUpperCase()} } from "./${
              file.path
            }";`
        )
        .join("\n");
    },
  },
];