Generate routes for Astro

generate-routes.mjs

import { writeFileSync } from "fs";
import { globSync } from "glob";

const apiRoutes = globSync("**/api/**/*.ts", {});
const pagesRoutes = globSync("**/pages/{/!(api)/[!_]*/,[!_]*/,/}[!_]*.astro", {});

const constDef = [];

function toConstDef(varName, path) {
  if (path.includes("[")) {
    const vars = path.match(/(?!\[)[^\[\]]+(?=\])/g);

    return `export const ${varName} = (${vars
      .map((x) => x + ":string")
      .join(",")}) => \`${path.replace(
      /\[\[?\.?\.?\.?([^\]]*)\]?\]/g,
      "$${$1}",
    )}\` as const`;
  }
  return `export const ${varName} = "${path}";`;
}

apiRoutes.forEach((route) => {
  const path = route
    .replace(/(src\/pages)/g, "")
    .replace(/.ts$/g, "");
  if (!path) {
    constDef.push(`export const ROOT_API="/"`);
    return;
  }
  const varName = path.toUpperCase().replace(/[\[\]\/\-.]/g, "_").replace(/^\_/g, "");
  constDef.push(toConstDef(varName, path));
});

pagesRoutes.forEach(route => {
  const strippedRoute = route.replace(/(src\/pages)|(\.astro)|(index)/g, "").replace(/\/$/g, "");
  

  if (!strippedRoute) {
    constDef.push(`export const PAGE_ROOT="/"`)
    return;
  }
  const varName = "PAGE"+strippedRoute.toUpperCase().replace(/[\[\]\/\-.]/g, "_").replace(/\_$/g, "");
  constDef.push(toConstDef(varName, strippedRoute))

})

const template = `/* 
 * I was generated. DON'T TOUCH ME!
*/

${constDef.join("\n")}
`;

writeFileSync("./routes.ts", template);

Don't forget to install glob!

npm i -D glob

Also you can add to package.json -> scripts:

"gen:routes": "node ./generate-routes.mjs"