plugin-babel generating require() calls

[winkler1]

Trying to get SP going on my React, Flow project. Have this to handle JSX and strip Flow:

[
      "@snowpack/plugin-babel",
      {
        input: [".js", ".jsx"],
        transformOptions: {
          plugins: ["babel-plugin-transform-flow-strip-types", "transform-object-rest-spread", "transform-class-properties"],
          presets: ["env", "@babel/preset-react"]
        }
      }
    ]

It's no longer getting confused by Flow types, but the code has require/_interopRequireDefault. Any way to have it output ESM? Is this caused by an old version of babel? (babel-core:6.26.0)

[FredKSchott]

I think it's probably "env": you'll want to set this option to false. https://babeljs.io/docs/en/babel-preset-env#modules

Please lmk if that fixes it, we should add it to a Babel guide.

[winkler1]

@FredKSchott Good news! ESM is kept with presets: [["@babel/preset-env", { modules: false }], "@babel/preset-react"]

Using "env" was an old version and gave a binding null error.