Force esbuild to output ES2019

[Dykam]

Rollup does not appear to support optional chaining (foo?.bar). Work around this by lowering the esbuild target to ES2019.

This is purely a proposal, I understand there might be unintended consequences. I can also imagine you might only want to do this for builds, where rollup is involved.

Related: rollup/plugins#205

Typescript:

       if (queryContext?.running) {

Current npx vite build output

vite v0.15.3
| Building for production...
[vite] Build errored out.
Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)
    at error (<snip>\node_modules\rollup\dist\shared\rollup.js:161:30)
    at Module.error (<snip>\node_modules\rollup\dist\shared\rollup.js:15097:16)
    at tryParse (<snip>\node_modules\rollup\dist\shared\rollup.js:14986:23)
    at Module.setSource (<snip>\node_modules\rollup\dist\shared\rollup.js:15385:30)
    at ModuleLoader.addModuleSource (<snip>\node_modules\rollup\dist\shared\rollup.js:17418:20)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async ModuleLoader.fetchModule (<snip>\node_modules\rollup\dist\shared\rollup.js:17479:9)
    at async <snip>\node_modules\rollup\dist\shared\rollup.js:17449:36
    at async Promise.all (index 0)
    at async ModuleLoader.fetchModule (<snip>\node_modules\rollup\dist\shared\rollup.js:17480:9) {
  code: 'PARSE_ERROR',
  parserError: SyntaxError: Unexpected token (478:23)
      at Object.pp$4.raise (<snip>\node_modules\rollup\dist\shared\rollup.js:3454:13)
      at Object.pp.unexpected (<snip>\node_modules\rollup\dist\shared\rollup.js:1258:8)
      at Object.pp$3.parseExprAtom (<snip>\node_modules\rollup\dist\shared\rollup.js:2853:10)
      at Object.parseExprAtom (<snip>\node_modules\rollup\dist\shared\rollup.js:5888:75)
      at Object.pp$3.parseExprSubscripts (<snip>\node_modules\rollup\dist\shared\rollup.js:2681:19)
      at Object.pp$3.parseMaybeUnary (<snip>\node_modules\rollup\dist\shared\rollup.js:2658:17)
      at Object.parseMaybeUnary (<snip>\node_modules\rollup\dist\shared\rollup.js:5802:29)
      at Object.pp$3.parseExprOps (<snip>\node_modules\rollup\dist\shared\rollup.js:2593:19)
      at Object.pp$3.parseMaybeConditional (<snip>\node_modules\rollup\dist\shared\rollup.js:2576:19)
      at Object.pp$3.parseMaybeAssign (<snip>\node_modules\rollup\dist\shared\rollup.js:2549:19) {
    pos: 17952,
    loc: Position { line: 478, column: 23 },
    raisedAt: 17953
  },
  pos: <snip>,
  loc: <snip>,
  frame: '<snip>' +
    '583:       if (queryContext?.running) {\n' +
    '                             ^\n' +
    '<snip>',
  watchFiles: <snip>
}
<snip>

[cypressious]

This seems to have been reverted by 893eeff#diff-1526d74dec8e3f18e0222b9a56b98254. I think this is affecting #565