rollup-plugin-local-import's Introduction

rollup-plugin-local-import

Rollup plugin for manipulating local import/export statements

Installation

rollup-plugin-local-import should be included in development dependencies.

yarn add --dev rollup-plugin-local-import

Supported Operating Systems

This plugin is built as native addon and supports following operating systems.

	node14	node16	node18
Windows x64	✓	✓	✓
Windows x32	✓	✓	✓
macOS x64	✓	✓	✓
macOS arm64	✓	✓	✓
Linux x64 gnu	✓	✓	✓
Linux x64 musl	✓	✓	✓

Support can be extended to cover more systems if needed.

Configuration

Add plugin in your rollup configuration:

import { defineConfig } from "rollup";
import { localImport } from "rollup-plugin-local-import";

export default defineConfig({
  // ...
  plugins: [localImport((path) => `${path}.js`)],
});

Options

function localImport(callback: Callback): RollupPlugin;

callback, (path: string) => string, required

Callback called with each identified local import. Must return string.

function transformLocalImports(path: string): string {
  console.log(`Path is "${path}"`);
  console.log(`Returning "${path}.js"`);

  return `${path}.js`;
}

export default defineConfig({
  // ...
  plugins: [localImport(transformLocalImports)],
});

> Path is "./Header"
> Returning "./Header.js"

- export { default } from './Header';
+ export { default } from './Header.js';

Examples

With localImport(path => path + '.js'):

Input:

export * from "./local-file";
export * from "../file-from-parent-directory";
export * from "some-dependency";

export { a } from "./local-file";
export { b } from "../file-from-parent-directory";
export { c } from "some-dependency";

Output:

export * from "./local-file.js";
export * from "../file-from-parent-directory.js";
export * from "some-dependency"; // Not changed

export { a } from "./local-file.js";
export { b } from "../file-from-parent-directory.js";
export { c } from "some-dependency"; // Not changed

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rollup-plugin-local-import's Issues

re-exporting named imports: `thread '<unnamed>' panicked`

Re-exporting a named import causes plugin to panic.

import { sideEffects } from "./some-file";

sideEffects();

export { sideEffects };

thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', src/parser.rs:31:38
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5

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