add basic backend code

web/backend/.gitignore

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+node_modules

web/backend/package.json

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+{
+  "name": "backend",
+  "version": "1.0.0",
+  "private": true,
+  "author": "Pacharapol Withayasakpunt <patarapolw@gmail.com> (https://polvcode.dev)",
+  "license": "MIT",
+  "scripts": {
+    "dev": "ts-node-dev src/index.ts"
+  },
+  "dependencies": {
+    "cheerio": "^1.0.0-rc.3",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "pug": "^2.0.4",
+    "scope-css": "^1.2.1",
+    "showdown": "^1.9.1"
+  },
+  "devDependencies": {
+    "@types/cheerio": "^0.22.16",
+    "@types/cors": "^2.8.6",
+    "@types/express": "^4.17.2",
+    "@types/node": "^13.7.6",
+    "@types/pug": "^2.0.4",
+    "@types/showdown": "^1.9.3",
+    "ts-node-dev": "^1.0.0-pre.44",
+    "typescript": "^3.8.2"
+  }
+}

web/backend/src/api/index.ts

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+import fs from 'fs'
+import path from 'path'
+
+import { Router } from 'express'
+import cors from 'cors'
+import pug from 'pug'
+// @ts-ignore
+import scopeCss from 'scope-css'
+import showdown from 'showdown'
+
+const apiRouter = Router()
+apiRouter.use(cors())
+
+const md = new showdown.Converter({
+  metadata: true
+})
+md.addExtension({
+  type: 'lang',
+  filter (text) {
+    const rowRegex = /(?:(?:^|\r?\n)(?:\| )?(?:(?:.* \| )+.+)*(?:.* \| )+.+(?: \|)?(?:$|\r?\n))+/m
+    text = text.replace(rowRegex, (p0) => {
+      return `<table>${
+        p0.trim().split('\n').map((pi) => {
+          pi = pi.trim().replace(/^|/, '').replace(/|$/, '')
+          return `<tr>${
+            pi.split(' | ').map((x) => x.trim()).map((qi) => {
+              return `<td>${qi}</td>`
+            })
+          }</tr>`
+        })
+      }</table>`
+    })
+    return text
+  }
+}, 'table')
+
+apiRouter.get('/data/*', (req, res, next) => {
+  const p = path.join('../../data', `${req.params[0]}.md`)
+
+  if (fs.existsSync(p)) {
+    let d = fs.readFileSync(p, 'utf8')
+    const id = 'el' + Math.random().toString(36).substr(2)
+
+    d = d
+      .replace(/```pug parsed\n(.+?)\n```/gs, (_, p1) => {
+        return pug.compile(p1, {
+          filters: {
+            markdown: (s: string) => `<x-markdown>${s}</x-markdown>`
+          }
+        })()
+      })
+      .replace(/```css parsed\n(.+?)\n```/gs, (_, p1) => {
+        return `<style>${scopeCss(p1, `#${id}`)}</style>`
+      })
+      .replace(/<x-markdown([^>]*)>(.+?)<\/x-markdown>/gs, (_, p1: string, p2: string) => {
+        const lines = p2.split('\n')
+        const marginRegex = new RegExp(`^ {1,${Math.max(0,
+          ...lines
+            .map((line) => /^ +[^ ]/.exec(line))
+            .map((m) => m ? m[0].length : 0)
+        )}}`)
+
+        return `<span data-markdown ${p1}>${
+          lines.map((line) => line.replace(marginRegex, '')).join('\n')
+        }</span>`
+      })
+
+    const html = `<div id=${id}>${md.makeHtml(d)}</div>`
+
+    res.send(html)
+  } else {
+    res.sendStatus(404)
+  }
+})
+
+export default apiRouter

web/backend/src/index.ts

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+import express from 'express'
+import apiRouter from './api'
+
+const app = express()
+const PORT = process.env.PORT || '48000'
+
+app.use('/api', apiRouter)
+
+app.listen(PORT, () => {
+  console.info(`Server is running at http://localhost:${PORT}`)
+})

web/backend/tsconfig.json

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+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "esnext",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    // "outDir": "./",                        /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    "strictNullChecks": true,              /* Enable strict null checks. */
+    "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}