rollup.config.js

import commonjs from "@rollup/plugin-commonjs"
import json from "@rollup/plugin-json"
import resolve from "@rollup/plugin-node-resolve"
import pkg from "./package.json"
import replace from "@rollup/plugin-replace"
import { visualizer } from "rollup-plugin-visualizer"
import typescript from "rollup-plugin-typescript2"
import { terser } from "rollup-plugin-terser"

// Creating regexes of the packages to make sure subpaths of the
// packages are also treated as external
const regexesOfPackages = [...Object.keys(pkg.dependencies || {}), ...Object.keys(pkg.peerDependencies || {})].map(
    packageName => new RegExp(`^${packageName}(\/.*)?`),
)

export default {
    input: "src/index.ts",
    output: [
        {
            format: "cjs",
            sourcemap: true,
            dir: "dist/lib",
            preserveModules: true,
            preserveModulesRoot: "src",
        },
        {
            // file: pkg.module,
            format: "es",
            sourcemap: true,
            dir: "dist/es",
            preserveModules: true,
            preserveModulesRoot: "src",
        },
    ],
    external: regexesOfPackages,
    watch: {
        include: "src/**",
    },
    onwarn(warning) {
        // https://stackoverflow.com/questions/43556940/rollup-js-and-this-keyword-is-equivalent-to-undefined
        if (warning.code === "THIS_IS_UNDEFINED") {
            return
        }
        console.warn(warning.message)
    },
    plugins: [
        replace({
            preventAssignment: true,
            values: {
                "process.env.LOGGER_ON": JSON.stringify(process.env.LOGGER_ON),
                "process.env.TRACK": JSON.stringify(process.env.TRACK),
                "process.env.METADATA_URL_CORE_OVERRIDE_OPTIMISM_GOERLI": JSON.stringify(
                    process.env.METADATA_URL_CORE_OVERRIDE_OPTIMISM_GOERLI,
                ),
                "process.env.METADATA_URL_CORE_OVERRIDE_OPTIMISM": JSON.stringify(
                    process.env.METADATA_URL_CORE_OVERRIDE_OPTIMISM,
                ),
                "process.env.METADATA_URL_PERIPHERY_OVERRIDE_OPTIMISM_GOERLI": JSON.stringify(
                    process.env.METADATA_URL_PERIPHERY_OVERRIDE_OPTIMISM_GOERLI,
                ),
                "process.env.METADATA_URL_PERIPHERY_OVERRIDE_OPTIMISM": JSON.stringify(
                    process.env.METADATA_URL_PERIPHERY_OVERRIDE_OPTIMISM,
                ),
            },
        }),
        resolve(), // NOTE: Find external modules.
        commonjs(), // NOTE: Convert CommonJS modules to ES6 before processing.
        json(),
        typescript(),
        terser(),
        visualizer(),
    ],
}