buni/index.js at main · mew-sh/buni · GitHub

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const rx_any = /./;
const rx_http = /^https?:\/\//;
const rx_relative_path = /^\.\.?\//;
const rx_absolute_path = /^\//;

function get_loader_from_url(href) {
    if (href.endsWith(".ts") || href.endsWith(".mts")) return "ts";
    if (href.endsWith(".tsx")) return "tsx";
    if (href.endsWith(".js") || href.endsWith(".mjs")) return "js";
    if (href.endsWith(".jsx")) return "jsx";
    return "js";
}

function load_http_module(href) {
    return fetch(href).then(function (response) {
        return response.text().then(function (text) {
            if (!response.ok) {
                return Promise.reject(
                    new Error("Failed to load module '" + href + "': " + text)
                );
            }
            const loader = get_loader_from_url(href);
            return { contents: text, loader };
        });
    });
}

Bun.plugin({
    name: "http_imports",
    setup(build) {
        build.onResolve({ filter: rx_relative_path }, function (args) {
            if (rx_http.test(args.importer)) {
                return { path: new URL(args.path, args.importer).href };
            }
        });

        build.onResolve({ filter: rx_absolute_path }, function (args) {
            if (rx_http.test(args.importer)) {
                return { path: new URL(args.path, args.importer).href };
            }
        });

        build.onResolve({ filter: rx_http }, function (args) {
            return { path: args.path };
        });

        build.onLoad({ filter: rx_any, namespace: "http" }, function (args) {
            return load_http_module("http:" + args.path);
        });

        build.onLoad({ filter: rx_any, namespace: "https" }, function (args) {
            return load_http_module("https:" + args.path);
        });
    },
});