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rollup.config.mjs
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rollup.config.mjs
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import { babel } from '@rollup/plugin-babel';
import commonjs from '@rollup/plugin-commonjs';
import fs from 'fs';
import peerDepsExternal from 'rollup-plugin-peer-deps-external';
import { readPackageUpSync } from 'read-pkg-up';
import resolve from '@rollup/plugin-node-resolve';
const excludePath = 'node_modules/**';
const extensions = ['.js', '.ts'];
const { packageJson: pkg } = readPackageUpSync({
cwd: fs.realpathSync(process.cwd()),
});
const fileInput = process.env.INPUT_FILE;
export default [
buildJS(fileInput, pkg.main, 'cjs'),
buildJS(fileInput, 'dist/esm', 'es'),
];
// Adapted from https://github.com/SoYoung210/lerna-rollup-github-package-example/blob/master/rollup.config.js
function buildJS(input, output, format) {
const defaultOutputConfig = {
format,
exports: 'named',
sourcemap: true,
};
const esOutputConfig = {
...defaultOutputConfig,
dir: output,
};
const cjsOutputConfig = {
...defaultOutputConfig,
file: output,
};
const config = {
input,
output: [format === 'es' ? esOutputConfig : cjsOutputConfig],
plugins: [
peerDepsExternal(),
commonjs(),
resolve({
preferBuiltins: false,
extensions,
}),
babel({
presets: ['@babel/env', '@babel/preset-typescript'],
plugins: ['@babel/plugin-transform-runtime'],
babelHelpers: 'runtime',
exclude: excludePath,
extensions,
}),
],
preserveModules: format === 'es',
};
return config;
}