Typescript watcher cannot recover #255

{ Error: @rollup/plugin-typescript TS1005: '}' expected.
    at error (/THE_REPRO/node_modules/rollup/dist/shared/rollup.js:10120:30)
    at throwPluginError (/THE_REPRO/node_modules/rollup/dist/shared/rollup.js:16242:12)
    at Object.error (/THE_REPRO/node_modules/rollup/dist/shared/rollup.js:17226:24)
    at emitDiagnostic (/THE_REPRO/node_modules/@rollup/plugin-typescript/dist/index.js:412:17)
    at reportDiagnostics (/THE_REPRO/node_modules/@rollup/plugin-typescript/dist/index.js:420:9)
    at Array.forEach (<anonymous>)
    at emitFilesAndReportErrors (/THE_REPRO/node_modules/typescript/lib/typescript.js:102879:21)
    at Object.result.afterProgramCreate (/THE_REPRO/node_modules/typescript/lib/typescript.js:103054:13)
    at Object.afterProgramCreate (/THE_REPRO/node_modules/@rollup/plugin-typescript/dist/index.js:441:29)
    at synchronizeProgram (/THE_REPRO/node_modules/typescript/lib/typescript.js:103300:22)
  pluginCode: 'TS1005',
  loc:
   { column: 1,
     line: 4,
     file:
      '/THE_REPRO/packages/app/src/test.ts' },
  frame:
   '\n\u001b[7m4\u001b[0m \n\u001b[7m \u001b[0m \u001b[91m\u001b[0m\n\n  \u001b[96msrc/test.ts\u001b[0m:\u001b[93m1\u001b[0m:\u001b[93m50\u001b[0m\n    \u001b[7m1\u001b[0m export default (a: number, b: number): number => {\n    \u001b[7m \u001b[0m \u001b[96m                                                 ~\u001b[0m\n    The parser expected to find a \'}\' to match the \'{\' token here.\n',
  code: 'PLUGIN_ERROR',
  plugin: 'typescript' }
error Command failed with exit code 1.

import typescript from '@rollup/plugin-typescript';
import babel from 'rollup-plugin-babel';
import peerDepsExternal from 'rollup-plugin-peer-deps-external';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import postcss from 'rollup-plugin-postcss';
import { terser } from 'rollup-plugin-terser';
import autoprefixer from 'autoprefixer';
import cssnano from 'cssnano';
import reactSvg from 'rollup-plugin-react-svg';

import pkg from './package.json';

const isProd = process.env.NODE_ENV === 'production';

export default {
  input: 'src/index.js',
  output: { format: 'cjs', file: pkg.main, sourcemap: true },
  plugins: [
    typescript(),
    babel({ exclude: 'node_modules/**' }),
    resolve(),
    commonjs(),
    peerDepsExternal({ includeDependencies: true }),
    postcss({ plugins: isProd ? [autoprefixer, cssnano] : [] }),
    reactSvg({ svgo: { plugins: [{ removeViewBox: false }] } }),
    isProd && terser({ compress: true, mangle: true }),
  ].filter(Boolean),
};