281 lines
8.1 KiB
TypeScript
281 lines
8.1 KiB
TypeScript
import * as ESBuild from 'https://deno.land/x/esbuild@v0.14.45/mod.js';
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import * as MIME from "https://deno.land/std@0.180.0/media_types/mod.ts";
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import { debounce } from "https://deno.land/std@0.151.0/async/debounce.ts";
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const Transpiled = new Map();
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/**
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* checks for (.tsx | .jsx | .ts | .js) extensions
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*/
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export const Transpileable =(inFilePath:string):boolean=>
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{
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let dotIndex = inFilePath.length-4;
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if(inFilePath[dotIndex] !== ".")
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{
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if(inFilePath[++dotIndex] !== ".")
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{
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return false;
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}
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}
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if(inFilePath[dotIndex+2] == "s")
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{
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const first = inFilePath[dotIndex+1];
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return (first == "t" || first == "j");
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}
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return false;
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};
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export const Transpile =async(inCode:string, inKey:string):Promise<string>=>
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{
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const transpile = await ESBuild.transform(inCode, { loader: "tsx", sourcemap: "inline", minify:true });
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Transpiled.set(inKey, transpile.code);
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return transpile.code;
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};
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type Transpiler = (inPath:string, inKey:string, inCheck?:boolean)=>Promise<string>;
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export const TranspileFS:Transpiler =async(inPath, inKey, inCheck)=>
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{
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if(inCheck)
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{
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const cached = Transpiled.get(inKey);
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if(cached)
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{
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return cached;
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}
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}
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const body = await Deno.readTextFile(inPath);
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return Transpile(body, inKey);
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};
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export const TranspileURL:Transpiler =async(inPath, inKey, inCheck)=>
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{
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if(inCheck)
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{
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const cached = Transpiled.get(inKey);
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if(cached)
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{
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return cached;
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}
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}
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const path = import.meta.resolve(`.${inPath}`);
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let body = await fetch(path);
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let text = await body.text();
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return Transpile(text, inKey);
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};
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type ImportMap = {imports?:Record<string, string>, importMap?:string};
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let ImportString = ``;
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let ImportObject:ImportMap = {};
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try
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{
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const confDeno = await Deno.readTextFile(Deno.cwd()+"/deno.json");
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const confDenoParsed:ImportMap = JSON.parse(confDeno);
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if(confDenoParsed.importMap)
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{
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try
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{
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const confImports = await Deno.readTextFile(confDenoParsed.importMap);
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try
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{
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ImportObject = JSON.parse(confImports);
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ImportString = confImports;
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}
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catch(e)
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{
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console.log(`"importMap" "${confDenoParsed.importMap}" contains invalid JSON`);
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}
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}
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catch(e)
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{
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console.log(`"importMap" "${confDenoParsed.importMap}" cannot be found`);
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}
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}
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else if(confDenoParsed.imports)
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{
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ImportObject = {imports:confDenoParsed.imports};
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ImportString = JSON.stringify(ImportObject);
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}
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if(ImportObject.imports)
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{
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const importReact = ImportObject.imports?.["react"];
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if(importReact)
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{
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ImportObject.imports["react-original"] = importReact;
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ImportObject.imports["react"] = "/lib/react.tsx";
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ImportString = JSON.stringify(ImportObject);
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}
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else
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{
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console.log(`"imports" configuration does not alias "react"`);
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}
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}
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else
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{
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console.log(`No "imports" found in configuration`);
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}
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}
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catch(e)
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{
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console.log(`deno.json not found`);
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}
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const Index = `
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<!doctype html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<script>
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</script>
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</head>
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<body>
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<div id="app">Loading</div>
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<script type="importmap">${ImportString}</script>
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<script async src="https://ga.jspm.io/npm:es-module-shims@1.5.1/dist/es-module-shims.js" crossorigin="anonymous"></script>
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<script type="module">
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import * as TW from "https://esm.sh/@twind/core@1.0.1";
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import TWPreTail from "https://esm.sh/@twind/preset-tailwind@1.0.1";
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import TWPreAuto from "https://esm.sh/@twind/preset-autoprefix@1.0.1";
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const Configure = {presets: [TWPreTail(), TWPreAuto()]};
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const ShadowDOM = document.querySelector("#app").attachShadow({mode: "open"});
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const ShadowDiv = document.createElement("div");
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const ShadowCSS = document.createElement("style");
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ShadowDOM.append(ShadowCSS);
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ShadowDOM.append(ShadowDiv);
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import App from "./app.tsx";
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App(ShadowDiv, Configure);
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TW.observe(TW.twind(Configure, TW.cssom(ShadowCSS)), ShadowDiv);
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</script>
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</body>
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</html>
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`;
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Deno.serve({ port: 3000 }, async(_req:Request) =>
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{
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const url:URL = new URL(_req.url);
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const fsPath = Deno.cwd()+url.pathname;
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console.log(`Request for "${url.pathname}"...`);
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if(_req.headers.get("upgrade") == "websocket")
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{
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try
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{
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const { response, socket } = Deno.upgradeWebSocket(_req);
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socket.onopen = () =>
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{
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Sockets.add(socket);
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console.log("Overwatch: Socket created");
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};
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socket.onclose = () =>
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{
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Sockets.delete(socket);
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console.log("Overwatch: Socket deleted");
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};
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socket.onmessage = (e) => {};
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socket.onerror = (e) => console.log("Overwatch: Socket errored:", e);
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return response;
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}
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catch(e)
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{
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//
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}
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}
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try
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{
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// serve index by default
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let type = `text/html`;
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let body:BodyInit = Index;
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const isLib = url.pathname.startsWith("/lib/")
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// serve .tsx .jsx .ts .js
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if(Transpileable(url.pathname))
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{
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type = `application/javascript`;
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if(isLib)
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{
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body = await TranspileURL(url.pathname, url.pathname, true);
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}
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else if(!url.searchParams.get("reload"))
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{
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const path = `file://${Deno.cwd().replaceAll("\\", "/")+url.pathname}`;
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console.log(path);
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const imp = await import(path);
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const members = [];
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for( const key in imp ) { members.push(key); }
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body =
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`import * as Import from "${url.pathname}?reload=0";
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${ members.map(m=>`let proxy_${m} = Import.${m}; export { proxy_${m} as ${m} };`).join(" ") }
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const reloadHandler = (updatedModule)=>
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{
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${ members.map(m=>`proxy_${m} = updatedModule.${m};`).join("\n") }
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};
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window.HMR("${url.pathname}", reloadHandler);`;
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}
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else
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{
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body = await TranspileFS(fsPath, url.pathname, true);
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}
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}
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// serve static media
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else if( url.pathname.endsWith("/") === false)
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{
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type = MIME.typeByExtension(url.pathname.substring(url.pathname.lastIndexOf("."))) || "text/html";
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if(isLib)
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{
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const _fetch = await fetch(import.meta.resolve(`.${url.pathname}`));
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body = await _fetch.text();
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}
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else
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{
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body = await Deno.readFile(fsPath);
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}
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}
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return new Response(body, {headers:{"content-type":type as string}});
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}
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catch(error)
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{
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console.log(error);
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return new Response(error, {status:404});
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}
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});
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const Sockets:Set<WebSocket> = new Set();
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const SocketsBroadcast =(inData:string)=>{ for (const socket of Sockets){ socket.send(inData); } }
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const FilesChanged:Map<string, string> = new Map();
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const ProcessFiles =debounce(async()=>
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{
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console.log("Files changed...")
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for await (const [file, action] of FilesChanged)
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{
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const pathname = file.substring(Deno.cwd().length).replaceAll("\\", "/");
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console.log(pathname, action);
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if(Transpileable(pathname))
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{
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if(action !== "remove")
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{
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await TranspileFS(file, pathname, false);
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console.log(` ...cached "${pathname}"`);
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SocketsBroadcast(pathname);
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}
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}
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}
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FilesChanged.clear();
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}, 1000);
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for await (const event of Deno.watchFs(Deno.cwd()))
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{
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event.paths.forEach( path => FilesChanged.set(path, event.kind) );
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ProcessFiles();
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} |