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helpers.ts
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/
helpers.ts
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import { createGenerator, type UnoGenerator } from "../lib/@unocss/core.ts";
import log from "../lib/log.ts";
import util from "../lib/util.ts";
import { isCanary, VERSION } from "../version.ts";
import { cacheFetch } from "./cache.ts";
import { basename, fromFileUrl, join, JSONC, type TransformOptions } from "./deps.ts";
import { getContentType } from "./media_type.ts";
import type { AlephConfig, CookieOptions, ImportMap, JSXConfig } from "./types.ts";
export const regUseUnocss = /\.(jsx|tsx)$/;
export const regFullVersion = /@\d+\.\d+\.\d+/;
export const builtinModuleExts = ["tsx", "ts", "mts", "jsx", "js", "mjs"];
/** Stores and returns the `fn` output in the `globalThis` object */
export async function globalIt<T>(name: string, fn: () => Promise<T>): Promise<T> {
const v: T | undefined = Reflect.get(globalThis, name);
if (v !== undefined) {
return v;
}
const ret = await fn();
if (ret !== undefined) {
Reflect.set(globalThis, name, ret);
}
return ret;
}
/** Stores and returns the `fn` output in the `globalThis` object synchronously. */
export function globalItSync<T>(name: string, fn: () => T): T {
const v: T | undefined = Reflect.get(globalThis, name);
if (v !== undefined) {
return v;
}
const ret = fn();
if (ret !== undefined) {
Reflect.set(globalThis, name, ret);
}
return ret;
}
/* Get the module URI of Aleph.js */
export function getAlephPkgUri(): string {
return globalItSync("__ALEPH_PKG_URI", () => {
const uriEnv = Deno.env.get("ALEPH_PKG_URI");
if (uriEnv) {
return uriEnv;
}
if (import.meta.url.startsWith("file://")) {
return "https://aleph";
}
return `https://deno.land/x/${isCanary ? "aleph_canary" : "aleph"}@${VERSION}`;
});
}
/* Get Aleph.js package URI. */
export function getAlephConfig(): AlephConfig | undefined {
return Reflect.get(globalThis, "__ALEPH_CONFIG");
}
/** Get the import maps. */
export async function getImportMap(appDir?: string): Promise<ImportMap> {
return await globalIt("__ALEPH_IMPORT_MAP", () => loadImportMap(appDir));
}
/** Get the jsx config. */
export async function getJSXConfig(appDir?: string): Promise<JSXConfig> {
return await globalIt("__ALEPH_JSX_CONFIG", () => loadJSXConfig(appDir));
}
/** Get the UnoCSS generator, return `null` if the presets are empty. */
export function getUnoGenerator(): UnoGenerator | null {
const config = getAlephConfig();
if (config === undefined) {
return null;
}
return globalItSync("__UNO_GENERATOR", () => {
if (config?.unocss) {
return createGenerator(config.unocss);
}
return null;
});
}
/** Get the deployment ID. */
export function getDeploymentId(): string | undefined {
return Deno.env.get("DENO_DEPLOYMENT_ID");
}
export function setCookieHeader(name: string, value: string, options?: CookieOptions): string {
const cookie = [`${name}=${value}`];
if (options) {
if (options.expires) {
cookie.push(`Expires=${new Date(options.expires).toUTCString()}`);
}
if (options.maxAge) {
cookie.push(`Max-Age=${options.maxAge}`);
}
if (options.domain) {
cookie.push(`Domain=${options.domain}`);
}
if (options.path) {
cookie.push(`Path=${options.path}`);
}
if (options.httpOnly) {
cookie.push("HttpOnly");
}
if (options.secure) {
cookie.push("Secure");
}
if (options.sameSite) {
cookie.push(`SameSite=${options.sameSite}`);
}
}
return cookie.join("; ");
}
export function toResponse(v: unknown, headers: Headers): Response {
if (
typeof v === "string" ||
v instanceof ArrayBuffer ||
v instanceof Uint8Array ||
v instanceof ReadableStream
) {
return new Response(v, { headers: headers });
}
if (v instanceof Blob || v instanceof File) {
headers.set("Content-Type", v.type);
headers.set("Content-Length", v.size.toString());
return new Response(v, { headers: headers });
}
if (util.isPlainObject(v) || Array.isArray(v)) {
return Response.json(v, { headers });
}
if (v === null) {
return new Response(null, { headers });
}
throw new Error("Invalid response type: " + typeof v);
}
export function fixResponse(res: Response, addtionHeaders: Headers, fixRedirect: boolean): Response {
if (res.status >= 300 && res.status < 400 && fixRedirect) {
return Response.json({ redirect: { location: res.headers.get("Location"), status: res.status } }, {
status: 501,
headers: addtionHeaders,
});
}
let headers: Headers | null = null;
addtionHeaders.forEach((value, name) => {
if (!headers) {
headers = new Headers(res.headers);
}
headers.set(name, value);
});
if (headers) {
return new Response(res.body, { status: res.status, statusText: res.statusText, headers });
}
return res;
}
/**
* fix remote url to local path.
* e.g. `https://esm.sh/react@17.0.2?dev` -> `/-/esm.sh/react@17.0.2?dev`
*/
export function toLocalPath(url: string): string {
if (util.isLikelyHttpURL(url)) {
let { hostname, pathname, port, protocol, search } = new URL(url);
const isHttp = protocol === "http:";
if ((isHttp && port === "80") || (protocol === "https:" && port === "443")) {
port = "";
}
return [
"/-/",
isHttp && "http_",
hostname,
port && "_" + port,
util.trimSuffix(pathname, "/"),
search,
].filter(Boolean).join("");
}
return url;
}
/**
* restore the remote url from local path.
* e.g. `/-/esm.sh/react@17.0.2` -> `https://esm.sh/react@17.0.2`
*/
export function restoreUrl(pathname: string): string {
let [h, ...rest] = pathname.substring(3).split("/");
let protocol = "https";
if (h.startsWith("http_")) {
h = h.substring(5);
protocol = "http";
}
const [host, port] = h.split("_");
return `${protocol}://${host}${port ? ":" + port : ""}/${rest.join("/")}`;
}
// check if the url is a npm package from esm.sh
export function isNpmPkg(url: string) {
return url.startsWith("https://esm.sh/") && !url.endsWith(".js") && !url.endsWith(".css");
}
/* check whether or not the given path exists as a directory. */
export async function existsDir(path: string): Promise<boolean> {
try {
const stat = await Deno.lstat(path);
return stat.isDirectory;
} catch (err) {
if (err instanceof Deno.errors.NotFound) {
return false;
}
throw err;
}
}
/* check whether or not the given path exists as regular file. */
export async function existsFile(path: string): Promise<boolean> {
try {
const stat = await Deno.lstat(path);
return stat.isFile;
} catch (err) {
if (err instanceof Deno.errors.NotFound) {
return false;
}
throw err;
}
}
/* find file in the directory */
export async function findFile(filenames: string[], cwd = Deno.cwd()): Promise<string | undefined> {
for (const filename of filenames) {
const fullPath = join(cwd, filename);
if (await existsFile(fullPath)) {
return fullPath;
}
}
return void 0;
}
/** Watch the directory and its subdirectories. */
export async function watchFs(rootDir: string, listener: (kind: "create" | "remove" | "modify", path: string) => void) {
const timers = new Map();
const debounce = (id: string, callback: () => void, delay: number) => {
if (timers.has(id)) {
clearTimeout(timers.get(id)!);
}
timers.set(
id,
setTimeout(() => {
timers.delete(id);
callback();
}, delay),
);
};
const reIgnore = /[\/\\](\.git(hub)?|\.vscode|vendor|node_modules|dist|out(put)?|target)[\/\\]/;
const ignore = (path: string) => reIgnore.test(path) || path.endsWith(".DS_Store");
const allFiles = new Set<string>(
(await getFiles(rootDir)).map((name) => join(rootDir, name)).filter((path) => !ignore(path)),
);
for await (const { kind, paths } of Deno.watchFs(rootDir, { recursive: true })) {
if (kind !== "create" && kind !== "remove" && kind !== "modify") {
continue;
}
for (const path of paths) {
if (ignore(path)) {
continue;
}
debounce(kind + path, async () => {
try {
await Deno.lstat(path);
if (!allFiles.has(path)) {
allFiles.add(path);
listener("create", path);
} else {
listener("modify", path);
}
} catch (error) {
if (error instanceof Deno.errors.NotFound) {
allFiles.delete(path);
listener("remove", path);
} else {
console.warn("watchFs:", error);
}
}
}, 100);
}
}
}
/** get files in the directory. */
export async function getFiles(
dir: string,
filter?: (filename: string) => boolean,
__path: string[] = [],
): Promise<string[]> {
const list: string[] = [];
if (await existsDir(dir)) {
for await (const dirEntry of Deno.readDir(dir)) {
if (dirEntry.isDirectory) {
list.push(...await getFiles(join(dir, dirEntry.name), filter, [...__path, dirEntry.name]));
} else {
const filename = [".", ...__path, dirEntry.name].join("/");
if (!filter || filter(filename)) {
list.push(filename);
}
}
}
}
return list;
}
/* fetch source code from fs/cdn/cache */
export async function fetchCode(
specifier: string,
target?: TransformOptions["target"],
): Promise<[code: string, contentType: string]> {
const config = getAlephConfig();
if (util.isLikelyHttpURL(specifier)) {
const url = new URL(specifier);
if (url.host === "aleph") {
return [await Deno.readTextFile("." + url.pathname), getContentType(url.pathname)];
}
if (url.hostname === "esm.sh") {
if (target && !url.pathname.includes(`/${target}/`) && !url.searchParams.has("target")) {
url.searchParams.set("target", target);
}
}
const res = await cacheFetch(url.href);
if (res.status >= 400) {
throw new Error(`fetch ${url.href}: ${res.status} - ${res.statusText}`);
}
return [await res.text(), res.headers.get("Content-Type") || getContentType(url.pathname)];
}
const root = config?.baseUrl ? fromFileUrl(new URL(".", config.baseUrl)) : Deno.cwd();
return [await Deno.readTextFile(join(root, specifier)), getContentType(specifier)];
}
async function findConfigFile(filenames: string[], appDir?: string): Promise<string | undefined> {
let denoConfigFile: string | undefined;
if (appDir) {
denoConfigFile = await findFile(filenames, appDir);
}
if (!denoConfigFile) {
denoConfigFile = await findFile(filenames);
}
return denoConfigFile;
}
/** Load the JSX config base the given import maps and the existing deno config. */
export async function loadJSXConfig(appDir?: string): Promise<JSXConfig> {
const jsxConfig: JSXConfig = {};
const denoConfigFile = await findConfigFile(["deno.jsonc", "deno.json", "tsconfig.json"], appDir);
if (denoConfigFile) {
try {
const { compilerOptions } = await parseJSONFile(denoConfigFile);
const { jsx, jsxFactory, jsxFragmentFactory, jsxImportSource } = (compilerOptions || {}) as Record<
string,
unknown
>;
if (
(jsx === undefined || jsx === "react-jsx" || jsx === "react-jsxdev") &&
util.isFilledString(jsxImportSource)
) {
jsxConfig.jsxImportSource = jsxImportSource;
} else {
if (typeof jsxFactory === "string") {
jsxConfig.jsxPragma = jsxFactory;
}
if (typeof jsxFragmentFactory === "string") {
jsxConfig.jsxPragmaFrag = jsxFragmentFactory;
}
}
} catch (error) {
log.error(`Failed to parse ${basename(denoConfigFile)}: ${error.message}`);
}
}
return jsxConfig;
}
/** Load the import maps from the json file. */
export async function loadImportMap(appDir?: string): Promise<ImportMap> {
const importMap: ImportMap = { __filename: "", imports: {}, scopes: {} };
const importMapFile = await findConfigFile(
["import_map", "import-map", "importmap", "importMap"].map((v) => `${v}.json`),
appDir,
);
if (importMapFile) {
try {
const { __filename, imports, scopes } = await parseImportMap(importMapFile);
if (import.meta.url.startsWith("file://") && appDir) {
const alephPkgUri = getAlephPkgUri();
if (alephPkgUri === "https://aleph") {
Object.assign(imports, {
"@unocss/": "https://aleph/lib/@unocss/",
"aleph/": "https://aleph/",
"aleph/server": "https://aleph/server/mod.ts",
"aleph/dev": "https://aleph/server/dev.ts",
"aleph/react": "https://aleph/runtime/react/mod.ts",
"aleph/react-ssr": "https://aleph/runtime/react/ssr.ts",
"aleph/react-client": "https://aleph/runtime/react/client.ts",
"aleph/vue": "https://aleph/runtime/vue/mod.ts",
"aleph/vue-ssr": "https://aleph/runtime/vue/ssr.ts",
});
}
}
Object.assign(importMap, { __filename });
Object.assign(importMap.imports, imports);
Object.assign(importMap.scopes, scopes);
} catch (e) {
log.error("loadImportMap:", e.message);
}
}
return importMap;
}
export async function parseJSONFile(jsonFile: string): Promise<Record<string, unknown>> {
const raw = await Deno.readTextFile(jsonFile);
if (jsonFile.endsWith(".jsonc")) {
return JSONC.parse(raw);
}
return JSON.parse(raw);
}
export async function parseImportMap(importMapFile: string): Promise<ImportMap> {
const importMap: ImportMap = { __filename: importMapFile, imports: {}, scopes: {} };
const data = await parseJSONFile(importMapFile);
const imports: Record<string, string> = toStringMap(data.imports);
const scopes: Record<string, Record<string, string>> = {};
if (util.isPlainObject(data.scopes)) {
Object.entries(data.scopes).forEach(([scope, imports]) => {
scopes[scope] = toStringMap(imports);
});
}
Object.assign(importMap, { imports, scopes });
return importMap;
}
function toStringMap(v: unknown): Record<string, string> {
const m: Record<string, string> = {};
if (util.isPlainObject(v)) {
Object.entries(v).forEach(([key, value]) => {
if (key === "") {
return;
}
if (util.isFilledString(value)) {
m[key] = value;
return;
}
if (util.isFilledArray(value)) {
for (const v of value) {
if (util.isFilledString(v)) {
m[key] = v;
return;
}
}
}
});
}
return m;
}