text: import { terser } from 'rollup-plugin-terser';
  import typescript from 'rollup-plugin-typescript2';
  import resolve from '@rollup/plugin-node-resolve';
  import { eslint } from 'rollup-plugin-eslint';
  import postcss from 'rollup-plugin-postcss';
  
  import pkg from './package.json';
  import path from 'path';
  import chalk from 'chalk';
  
  const { exec } = require('child_process');
  
  process.env.BUILD = process.env.BUILD || 'development';
  const PRODUCTION = process.env.BUILD === 'production';
  const BUILD_ID =
      Date.now().toString(36).slice(-2) +
      Math.floor(Math.random() * 0x186a0).toString(36);
  const BUILD_DIRECTORY = 'dist';
  
  const TYPESCRIPT_OPTIONS = {
      // typescript: require('typescript'),
      clean: PRODUCTION,
      // verbosity: 3,
      include: ['*.ts+(|x)', '**/*.ts+(|x)', '*.js+(|x)', '**/*.js+(|x)'],
      tsconfigOverride: {
          compilerOptions: {
              // declaration: false,
          },
      },
  };
  
  const SDK_VERSION = pkg.version || 'v?.?.?';
  
  const TERSER_OPTIONS = {
      compress: {
          drop_console: true,
          drop_debugger: true,
          ecma: 8, // Use "5" to support older browsers
          module: true,
          warnings: true,
          passes: 4,
          global_defs: {
              ENV: JSON.stringify(process.env.BUILD),
              SDK_VERSION: SDK_VERSION,
              BUILD_ID: JSON.stringify(BUILD_ID),
              GIT_VERSION: process.env.GIT_VERSION || '?.?.?',
          },
      },
      output: {
          preamble: '/* MathLive ' + SDK_VERSION + '  */',
          ascii_only: true, // The project has some characters (”) which can
          // confuse Safari when the charset is not set to UTF-8 on the page.
          // This workaround that.
      },
  };
  
  function normalizePath(id) {
      return path.relative(process.cwd(), id).split(path.sep).join('/');
  }
  
  function timestamp() {
      const now = new Date();
      return chalk.green(
          `${now.getHours()}:${('0' + now.getMinutes()).slice(-2)}:${(
              '0' + now.getSeconds()
          ).slice(-2)}`
      );
  }
  
  // Rollup plugin to display build progress and launch server
  function buildProgress() {
      return {
          name: 'rollup.config.js',
          transform(_code, id) {
              const file = normalizePath(id);
              if (file.includes(':')) {
                  return;
              }
  
              if (
                  process.stdout.isTTY &&
                  typeof process.stdout.clearLine === 'function'
              ) {
                  process.stdout.clearLine();
                  process.stdout.cursorTo(0);
                  process.stdout.write(
                      chalk.green(' ●') + '  Building ' + chalk.grey(file)
                  );
              } else {
                  console.log(chalk.grey(file));
              }
          },
          buildEnd() {
              if (
                  process.env.BUILD === 'watch' ||
                  process.env.BUILD === 'watching'
              ) {
                  if (
                      process.stdout.isTTY &&
                      typeof process.stdout.clearLine === 'function'
                  ) {
                      process.stdout.clearLine();
                      process.stdout.cursorTo(0);
                      process.stdout.write(
                          timestamp() +
                              (process.env.BUILD === 'watching'
                                  ? ' Build updated'
                                  : ' Build done')
                      );
                  }
              } else {
                  if (
                      process.stdout.isTTY &&
                      typeof process.stdout.clearLine === 'function'
                  ) {
                      process.stdout.clearLine();
                      process.stdout.cursorTo(0);
                  }
              }
              if (process.env.BUILD === 'watch') {
                  process.env.BUILD = 'watching';
                  if (
                      process.stdout.isTTY &&
                      typeof process.stdout.clearLine === 'function'
                  ) {
                      process.stdout.clearLine();
                      process.stdout.cursorTo(0);
                  }
                  console.log(chalk.green(' ✔') + '  Build complete ');
                  console.log(' 🚀 Launching server');
                  exec(
                      "npx http-server . -s -c-1 --cors='*' -o /examples/test-cases/index.html",
                      (error, stdout, stderr) => {
                          if (error) {
                              console.error(`http-server error: ${error}`);
                              return;
                          }
                          console.log(stdout);
                          console.error(stderr);
                      }
                  );
              }
          },
      };
  }
  
  const ROLLUP = [
      // MathLive main module
      {
          onwarn(warning, warn) {
              // The use of #private class variables seem to trigger this warning.
              if (warning.code === 'THIS_IS_UNDEFINED') return;
              warn(warning);
          },
          // @todo: generate multiple flavors (i.e. no-editor, renderer only)
          // by specifying multiple inputs:
          // input: [ 'mathlive': 'src/mathlive.ts', 'mathlive-render': 'src/mathlive-render.ts' ]
          input: 'src/mathlive.ts',
          plugins: [
              buildProgress(),
              PRODUCTION && eslint({ exclude: ['**/*.less'] }),
              postcss({
                  extract: false, // extract: path.resolve('dist/mathlive.css')
                  modules: false,
                  inject: false,
                  extensions: ['.css', '.less'],
                  plugins: [],
                  minimize: PRODUCTION,
              }),
              resolve({
                  customResolveOptions: {
                      moduleDirectory: 'submodules/math-json/src',
                  },
              }),
              typescript(TYPESCRIPT_OPTIONS),
          ],
          output: true
              ? [
                    // JavaScript native module
                    // (stricly speaking not necessary, since the UMD output is module
                    // compatible, but this gives us a "clean" module)
                    {
                        format: 'es',
                        file: `${BUILD_DIRECTORY}/mathlive.mjs`,
                        sourcemap: !PRODUCTION,
                        exports: 'named',
                    },
                    // UMD file, suitable for import, <script> and require()
                    {
                        format: 'umd',
                        name: 'MathLive',
                        file: `${BUILD_DIRECTORY}/mathlive.js`,
                        sourcemap: !PRODUCTION,
                        exports: 'named',
                    },
                ]
              : [
                    {
                        format: 'es',
                        file: `${BUILD_DIRECTORY}/mathlive.mjs`,
                        sourcemap: !PRODUCTION,
                    },
                ],
          watch: {
              clearScreen: true,
              exclude: ['node_modules/**'],
          },
      },
  ];
  
  // MathLive Vue-js adapter
  ROLLUP.push({
      input: 'src/vue-mathlive.js',
      plugins: [terser(TERSER_OPTIONS)],
      output: {
          // JavaScript native module
          sourcemap: false,
          file: 'dist/vue-mathlive.mjs',
          format: 'es',
      },
  });
  
  if (PRODUCTION) {
      // Minified versions
      ROLLUP.push({
          onwarn(warning, warn) {
              // The use of #private class variables seem to trigger this warning.
              if (warning.code === 'THIS_IS_UNDEFINED') return;
              warn(warning);
          },
          input: 'src/mathlive.ts',
          plugins: [
              buildProgress(),
              postcss({
                  extract: false, // extract: path.resolve('dist/mathlive.css')
                  modules: false,
                  inject: false,
                  extensions: ['.css', '.less'],
                  plugins: [],
                  minimize: true,
              }),
              resolve(),
              typescript(TYPESCRIPT_OPTIONS),
              terser(TERSER_OPTIONS),
          ],
          output: [
              // JavaScript native module
              // (stricly speaking not necessary, since the UMD output is module
              // compatible, but this gives us a "clean" module)
              {
                  format: 'es',
                  file: `${BUILD_DIRECTORY}/mathlive.min.mjs`,
                  sourcemap: false,
              },
              // UMD file, suitable for import, <script> and require()
              {
                  format: 'umd',
                  name: 'MathLive',
                  file: `${BUILD_DIRECTORY}/mathlive.min.js`,
                  sourcemap: false,
              },
          ],
      });
  }
  
  export default ROLLUP;
  