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npm_local.ts
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npm_local.ts
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import {
basename,
dirname,
join,
OnResolveArgs,
Plugin,
PluginBuild,
} from "./deps.ts";
import { fm } from "./bundlet.ts";
let rootDir = "node_modules";
let server: Deno.HttpServer;
let port = 12346;
const ext = /\.(m?js|ts)$/i;
function modulesServe(port = 0, root?: string) {
if (root) {
rootDir = root;
}
try {
const info = Deno.statSync(rootDir);
if (info?.isFile) {
return;
}
} catch {
return;
}
server = Deno.serve(
{ port: port || 12345, hostname: "localhost" },
handlers,
);
}
function found(flpath: string, base: string): string {
let info;
let abs = false;
if (!flpath.startsWith(".")) {
abs = true;
flpath = join(rootDir, flpath);
} else {
flpath = join(base, flpath);
}
try {
info = Deno.statSync(flpath);
} catch {
// skip
}
const name = basename(flpath);
if (info?.isFile || ext.test(name)) {
return info?.isFile ? flpath : "";
}
const prefixes = [".esm", ".es6", ".es", ".module", ""];
const exts = (abs
? [
...([".ts", ".js", ".module.js"].map((
x,
) => [`/${name}${x}`, `/dist/${name}${x}`, `/build/${name}${x}`]))
.flat(),
...(prefixes.map((
x,
) => [
`/index${x}.js`,
`/dist/index${x}.js`,
`/dist/esm/index${x}.js`,
`/build/index${x}.js`,
]))
.flat(),
]
: []).concat([".ts", ...(prefixes.map((x) => `${x}.js`)), ".mjs"]);
for (let i = 0; i < exts.length; i++) {
try {
const src = `${flpath}${exts[i]}`;
info = Deno.statSync(src);
if (info.isFile || info.isSymlink) {
flpath = src;
break;
}
if (info.isDirectory) {
continue;
}
} catch {
// skip
}
}
if (!info?.isFile) {
return "";
}
return flpath;
}
const xfrom = /((?:^import|\simport|\s+from)\s*['"])([^'"]+)(['"])/g;
const xnpm = /^(src\/)?(npm>:)/i;
async function handlers(req: any) {
const url = new URL(req.url.replace(/\/cjs\//g, "/esm/"));
const flpath = found(
decodeURIComponent(url.pathname.substring(1)),
rootDir,
);
if (!flpath) {
return new Response("404 Not Found", { status: 404 });
}
const body = await Deno.readTextFile(flpath);
const base = dirname(flpath);
const result = body.replace(xfrom, (s, m1, m2, m3) => {
if (m2.startsWith(".") && ext.test(m2)) {
return s;
}
const src = found(m2, base);
const m = src.match(ext);
if (m) {
const target = src.startsWith(rootDir)
? `npm>:${src.substring(rootDir.length + 1)}`
: `${m2}${m[0]}`;
return [m1, target, m3].join("");
}
return s;
});
return new Response(result, {
headers: {
"Content-Type": `text/${
/\.ts$/i.test(flpath) ? "typescript" : "javascript"
}`,
"Cache-Control": "no-cache",
},
});
}
export function serve(dirPort = "") {
if (/^(no|off|false|-)$/i.test(dirPort)) return;
const i = dirPort.indexOf(":");
let root = "";
if (i > -1) {
port = parseInt(dirPort.substring(i + 1), 10);
root = dirPort.substring(0, i);
} else {
root = dirPort;
}
modulesServe(port > 0 ? port : 0, root);
}
export async function close() {
await server?.shutdown();
}
export const resolveSrc = (src: string) => {
if (!validSrc(src)) {
return src;
}
return `http://localhost:${port}/${src.replace(xnpm, "")}?${Math.random()}`;
};
export const target = (target: string) => {
return target.replace(xnpm, "npm/");
};
export const validSrc = (src: string) => {
return xnpm.test(src);
};
export function pure(src: string) {
src = src.replace(/\b(esm|cjs|mjs|dist|build)\//g, "").replace(
/\/index[^/]+$/,
"",
);
return xnpm.test(src) ? src.substring(src.indexOf(":") + 1) : basename(src);
}
export const resolve = {
name: "npm-local-modules",
setup(build: PluginBuild) {
build.onResolve({ filter: xnpm }, (args: OnResolveArgs) => {
const name = pure(args.path).replace(/\.js$/, "");
if (fm[name]) {
return { path: fm[name], external: true };
}
if (!server) {
return { path: args.path };
}
return {
path: resolveSrc(args.path).replace("http:", ""),
namespace: "http",
};
});
},
} as Plugin;