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

bud.js core module

import isString from '@roots/bud-support/isString';
export const watch = async function (...params) {
    if (!this.isDevelopment)
        return this;
    const [files, options] = makeFilesAndOptions(...params);
    this.hooks.on(`dev.watch.files`, (watchlist = new Set()) => {
        files.map(file => watchlist.add(file));
        return watchlist;
    });
    this.hooks.on(`dev.watch.options`, (watchOptions = {}) => ({
        ...watchOptions,
        ...options,
    }));
    return this;
};
const makeFilesAndOptions = (...params) => {
    let files = [];
    let options = {};
    if (Array.isArray(params[0])) {
        files = params[0];
    }
    if (isString(params[0])) {
        files = [params[0]];
    }
    if (params[0] && !Array.isArray(params[0]) && !isString(params[0])) {
        options = params[0];
    }
    if (params[1]) {
        options = params[1];
    }
    return [files, options];
};