able-baker/run-serve.tsx

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import * as MIME from "https://deno.land/std@0.180.0/media_types/mod.ts";
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import * as SWCW from "https://esm.sh/@swc/wasm-web@1.3.62";
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Deno.args.forEach(arg=>
{
if(arg.startsWith("--"))
{
const kvp = arg.substring(2).split("=");
Deno.env.set(kvp[0], kvp[1] || "true");
}
});
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type DenoConfig = {imports:Record<string, string>};
const ImportMap:DenoConfig = {imports:{}};
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let ImportMapOriginal = {};
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const ImportMapReload =async()=>
{
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let json:DenoConfig;
const path = Configuration.Proxy+"/deno.json";
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try
{
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const resp = await fetch(path);
json = await resp.json();
if(!json?.imports)
{ throw new Error("imports not specified in deno.json") }
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ImportMapOriginal = json;
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}
catch(e)
{
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console.log(`error reading deno config "${path}" message:"${e}"`);
return;
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}
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if(!json.imports["react"])
{
console.log(`"react" specifier not defined in import map`);
}
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else if(!json.imports["react/"])
{
json.imports["react/"] = json.imports["react"]+"/";
}
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if(!json.imports["entry"])
{
console.log(`"entry" specifier not defined in import map.`);
}
Object.entries(json.imports).forEach(([key, value])=>
{
if(value.startsWith("./"))
{
json.imports[key] = value.substring(1);
}
});
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ImportMap.imports = Configuration.Remap(json.imports, Configuration);
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};
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type CustomHTTPHandler = (inReq:Request, inURL:URL, inExt:string|false, inMap:{imports:Record<string, string>}, inConfig:Configuration)=>void|false|Response|Promise<Response|void|false>;
type CustomRemapper = (inImports:Record<string, string>, inConfig:Configuration)=>Record<string, string>;
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type Configuration = {Proxy:string, Allow:string, Reset:string, SWCOp:SWCW.Options, Serve:CustomHTTPHandler, Shell:CustomHTTPHandler, Remap:CustomRemapper};
type ConfigurationArgs = {Proxy?:string, Allow?:string, Reset?:string, SWCOp?:SWCW.Options, Serve?:CustomHTTPHandler, Shell?:CustomHTTPHandler, Remap?:CustomRemapper};
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let Configuration:Configuration =
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{
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Proxy: new URL(`file://${Deno.cwd().replaceAll("\\", "/")}`).toString(),
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Allow: "*",
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Reset: "/clear-cache",
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async Serve(inReq, inURL, inExt, inMap, inConfig){},
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Remap: (inImports, inConfig)=>
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{
return inImports;
},
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Shell(inReq, inURL, inExt, inMap, inConfig)
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{
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const parts = Deno.mainModule.split(inConfig.Proxy);
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return new Response(
`<!doctype html>
<html>
<head>
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<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<meta charset="utf-8"/>
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</head>
<body>
<div id="app"></div>
<script type="importmap">${JSON.stringify(inMap)}</script>
<script type="module">
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import Mount from "${import.meta.resolve("./run-browser.tsx")}";
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Mount("#app", "entry");
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</script>
</body>
</html>`, {status:200, headers:{"content-type":"text/html"}});
},
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SWCOp:
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{
sourceMaps: false,
minify: true,
jsc:
{
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target:"es2022",
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minify:
{
compress: { unused: true },
mangle: true
},
parser:
{
syntax: "typescript",
tsx: true,
},
transform:
{
react: { runtime: "automatic" }
}
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}
}
};
export const Transpile =
{
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Cache: new Map() as Map<string, string>,
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Files: ["tsx", "jsx", "ts", "js", "mjs"],
Check(inExtension:string|false)
{
return inExtension ? this.Files.includes(inExtension) : false;
},
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Clear()
{
const size = this.Cache.size;
this.Cache.clear();
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ImportMapReload();
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return size;
},
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/**
* Converts dynamic module imports in to static, also can resolve paths with an import map
*/
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async Patch(inPath:string, inKey:string, inMap?:DenoConfig)
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{
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const check = this.Cache.get(inKey);
if(check)
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{
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return check;
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}
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let file, text;
try
{
file = await fetch(inPath);
text = await file.text();
}
catch(e)
{
return false;
}
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const remap = inMap ? (inPath:string)=>
{
const match = inMap.imports[inPath];
if(match)
{
return match;
}
else if(inPath.includes("/"))
{
let bestKey = "";
let bestLength = 0;
Object.keys(inMap.imports).forEach((key, i, arr)=>
{
if(key.endsWith("/") && inPath.startsWith(key) && key.length > bestLength)
{
bestKey = key;
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bestLength = key.length;
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}
});
if(bestKey)
{
return inMap.imports[bestKey]+inPath.substring(bestKey.length);
}
}
return inPath;
}
: (inPath:string)=>inPath;
let match, regex;
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let convertedBody = text;
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// remap static imports
regex = /from\s+(['"`])(.*?)\1/g;
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while ((match = regex.exec(text)))
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{
const importStatement = match[0];
const importPath = match[2];
convertedBody = convertedBody.replace(importStatement, `from "${remap(importPath)}"`);
}
// convert dynamic imports into static (to work around deno deploy)
const staticImports = [];
regex = /(?<![\w.])import\(([^)]+)(?!import\b)\)/g;
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while ((match = regex.exec(text)))
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{
const importStatement = match[0];
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const importPath = remap(match[1].substring(1, match[1].length-1));
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const moduleName = `_dyn_${staticImports.length}` as string;
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staticImports.push(`import ${moduleName} from ${importPath};`);
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convertedBody = convertedBody.replace(importStatement, `Promise.resolve(${moduleName})`);
}
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convertedBody = staticImports.join("\n") + convertedBody;
inKey && this.Cache.set(inKey, convertedBody);
return convertedBody;
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},
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async Fetch(inPath:string, inKey:string, inCheckCache=true)
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{
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const check = this.Cache.get(inPath);
if(check && inCheckCache)
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{
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return check;
}
else
{
try
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{
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const resp = await fetch(inPath);
const text = await resp.text();
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const {code} = await SWCW.transform(text, { ...Configuration.SWCOp, filename:inKey});
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this.Cache.set(inKey, code);
return code;
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}
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catch(e)
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{
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console.log(`Transpile.Fetch error. Key:"${inKey}" Path:"${inPath}" Error:"${e}"`);
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return null;
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}
}
}
};
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export const ExtensionPrefix =(string:string, suffix:string)=>
{
const lastDotIndex = string.lastIndexOf(".");
if (lastDotIndex === -1) {
return string;
}
const prefix = string.substring(0, lastDotIndex);
const suffixString = string.substring(lastDotIndex + 1);
return prefix + "." + suffix + "." + suffixString;
};
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export const Extension =(inPath:string)=>
{
const posSlash = inPath.lastIndexOf("/");
const posDot = inPath.lastIndexOf(".");
return posDot > posSlash ? inPath.substring(posDot+1).toLowerCase() : false;
};
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export const Configure =(config:ConfigurationArgs)=>
{
Configuration = {...Configuration, ...config};
ImportMapReload();
}
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await ImportMapReload();
await SWCW.default();
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const server = Deno.serve({port:parseInt(Deno.env.get("port")||"8000")}, async(req: Request)=>
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{
const url:URL = new URL(req.url);
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const ext = Extension(url.pathname);
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const headers = {"content-type":"application/json", "Access-Control-Allow-Origin": Configuration.Allow, "charset":"UTF-8"};
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// cache-reset route
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if(url.pathname === Configuration.Reset)
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{
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return new Response(`{"cleared":${Transpile.Clear()}}`, {headers});
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}
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// allow for custom handler
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const custom = await Configuration.Serve(req, url, ext, ImportMap, Configuration);
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if(custom)
{
return custom;
}
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// transpileable files
if(Transpile.Check(ext))
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{
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let code;
let path;
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let file;
if( req.headers.get("user-agent")?.startsWith("Deno") || url.searchParams.has("deno") )
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{
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try
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{
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path = Configuration.Proxy + ExtensionPrefix(url.pathname, "deno");
console.log("looking for", path);
file = await fetch(path) as Response;
if(file.ok)
{
code = await file.text();
}
else
{
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throw new Error("404");
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}
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}
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catch(e)
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{
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path = Configuration.Proxy + url.pathname;
console.log("falling back to", path);
file = await fetch(path);
code = await file.text();
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}
}
else
{
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path = Configuration.Proxy + url.pathname;
code = await Transpile.Fetch(path, url.pathname);
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}
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if(code)
{
return new Response(code, {headers:{...headers, "content-type":"application/javascript"}} );
}
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}
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// custom page html
if(!ext)
{
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const shell = await Configuration.Shell(req, url, ext, ImportMap, Configuration);
if(shell)
{
return shell;
}
}
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// all other static files
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if(ext)
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{
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try
{
const type = MIME.typeByExtension(ext);
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const file = await fetch(Configuration.Proxy + url.pathname);
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return new Response(file.body, {headers:{...headers, "content-type":type||""}});
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}
catch(e)
{
return new Response(`{"error":"${e}", "path":"${url.pathname}"}`, {status:404, headers});
}
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}
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return new Response(`{"error":"unmatched route", "path":"${url.pathname}"}`, {status:404, headers});
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});