Unexpected result when esbuild.transform is enabled with minifySyntax @0.14.40

[yanm1ng]

esbuild version 0.14.39

const esbuild = require('esbuild');

(async () => {
  const result = await esbuild.transform(`const a = { '-2': 'xxx' }`, {
    target: 'es6',
    minifySyntax: true,
  });
  console.log(result.code);
  // const a = { "-2": "xxx" };
})();

esbuild version 0.14.40

const esbuild = require('esbuild');

(async () => {
  const result = await esbuild.transform(`const a = { '-2': 'xxx' }`, {
    target: 'es6',
    minifySyntax: true,
  });
  console.log(result.code);
  // const a = { -2: "xxx" };
})();

{ -2: "xxx" } will cause browser errors.

[noonnightstorm]

same problem

[NickGeek]

I've also ran into this minifying the following line:

t2.exports = { 2: "need dictionary", 1: "stream end", 0: "", "-1": "file error", "-2": "stream error", "-3": "data error", "-4": "insufficient memory", "-5": "buffer error", "-6": "incompatible version" };

[ZWkang]

case in vite + esbuild + vue.js

const refref = ref({ '-1': 'somethings' })

turn to

const refref = ref({ -1: 'somethings' })

[evanw]

Whoops, sorry about that. I will fix this soon.