@roots/bud-api/lib/methods/config/index.js

bud.js core module

import { BudError } from '@roots/bud-support/errors';
import isFunction from '@roots/bud-support/isFunction';
export const config = function (input) {
    if (!input)
        throw new BudError(`config input must pass a callback function that returns a webpack configuration`, {
            docs: new URL(`https://bud.js.org/docs/bud.config`),
            thrownBy: `bud.config`,
        });
    this.hooks.action(`build.after`, async (app) => {
        if (!app)
            return;
        app.build.config = isFunction(input)
            ? await input(app.build.config)
            : { ...app.build.config, ...input };
    });
    return this;
};