Support ESM like ECharts v5.5

[kingyue737]

Currently, this repo is not maintained.

I also encountered #181 in nuxt, because of the missing of js extension when import module from echarts.
Many users cannot use this plugin (#141) which may be due to a dual package hazard (register liquidFill in umd while echarts is esm).

I believe both can be easily solved by migrate to a modern library bundler like unbuild or tsup.

ECharts 5.5 has already changed to default esm package apache/echarts#19513. I think it makes sense to also follow this change in this repo

Is PR welcomed？ I would like to solve this issue.

[szhang6]

Does this support echarts's version which is "echarts": "^5.5.0" ? It seems does not support for now, right ?

[kingyue737]

Does this support echarts's version which is "echarts": "^5.5.0" ? It seems does not support for now, right ?

It can be used with v5.5 but may not be out-of-box in some cases. It depends on your environment.