Support ESM exports

[redsuperbat]

Hi!
I would like to use this library in an esm only project. Currently I have to write a shim to make it work but a pure esm export would make that much easier.

Is that something you would consider adding?

[kenjiuno]

Hi.

There is another project, msgreader-web-ng, where it is targeting ESM.

• @kenjiuno/msgreader-web-ng - npm
• HiraokaHyperTools/msgreader-web-ng
• @kenjiuno/msgreader-web-ng - v0.2.0-alpha1