build.js

"use strict";

import ChildProcess from "child_process";
import Fs from "fs";

class BuildError extends Error {};

// Executes a shell command line.
// An error is thrown when the exit code of the command is not 0.
function shell (cmdLine) {
   ChildProcess.execSync(cmdLine, {stdio: "inherit"});
}

function copyToDist (fileNames) {
   for (const fileName of fileNames) {
      Fs.copyFileSync(fileName, "dist/" + fileName);
   }
}

function delDir (dirName) {
   Fs.rmSync(dirName, {recursive: true, force: true});
}

function main2() {
   const argv = process.argv;
   if (argv.length > 3) {
      throw new BuildError("Extra command line parameters.");
   }
   let cmd = (argv.length > 2) ? argv[2] : "build";
   switch (cmd) {
      case "clean": {
         delDir("dist");
         break;
      }
      case "build": {
         delDir("dist");
         shell("tsc");
         shell("eslint --ext .ts src/**");
         copyToDist([".npmignore", "LICENSE.md", "README.md", "NOTICE.md", "package.json", "build.js"]);
         console.log("Build completed.");
         break;
      }
      case "verifyCurrentDirIsDist": {
         if (!process.cwd().endsWith("dist")) {
            console.log("Current directory is: " + process.cwd());
            throw new BuildError("*** NPM pack/publish must be run in the dist directory! ***");
         }
         break;
      }
      default: {
         throw new BuildError(`Invalid command parameter "${cmd}".`);
      }
   }
}

function main() {
   try {
      main2();
   } catch (e) {
      if (e instanceof BuildError) {
         console.log(e.message);
      } else {
         console.log(e.toString());
      }
      process.exitCode = 99;
      return;
   }
}

main();