@pika/plugin-build-web/dist-src/index.js

A @pika/pack plugin: Adds an ESM distribution to your package, built & optimized to run in most web browsers (and bundlers).

import path from 'path';
import fs from 'fs';
import { MessageError } from '@pika/types';
import { rollup } from 'rollup';
const DEFAULT_ENTRYPOINT = 'module';
export async function beforeJob({ out }) {
    const srcDirectory = path.join(out, 'dist-src/');
    if (!fs.existsSync(srcDirectory)) {
        throw new MessageError('"dist-src/" does not exist, or was not yet created in the pipeline.');
    }
    const srcEntrypoint = path.join(out, 'dist-src/index.js');
    if (!fs.existsSync(srcEntrypoint)) {
        throw new MessageError('"dist-src/index.js" is the expected standard entrypoint, but it does not exist.');
    }
}
export function manifest(manifest, { options }) {
    if (options.entrypoint !== null) {
        let keys = options.entrypoint || [DEFAULT_ENTRYPOINT];
        if (typeof keys === 'string') {
            keys = [keys];
        }
        for (const key of keys) {
            manifest[key] = manifest[key] || 'dist-web/index.js';
        }
    }
}
export async function build({ out, options, reporter }) {
    const writeToWeb = path.join(out, 'dist-web', 'index.js');
    const result = await rollup({
        input: path.join(out, 'dist-src/index.js'),
        plugins: [],
        onwarn: ((warning, defaultOnWarnHandler) => {
            // // Unresolved external imports are expected
            if (warning.code === 'UNRESOLVED_IMPORT' &&
                !(warning.source.startsWith('./') || warning.source.startsWith('../'))) {
                return;
            }
            defaultOnWarnHandler(warning);
        }),
    });
    await result.write({
        file: writeToWeb,
        format: 'esm',
        exports: 'named',
        sourcemap: options.sourcemap === undefined ? true : options.sourcemap,
    });
    reporter.created(writeToWeb, 'module');
}