`FileReader` and `File` seems to be missing when compiling to NPM

[zeachco]

Hello I'm unsure if this would be the right place for such issue of if it should be part of a shim project, feel free to redirect me.

while compiling the following Deno/TS code:

export function fromFile(file: File) {
  return new Promise((resolve) => {
    const reader = new FileReader();
    reader.onload = (e: any) => {
      const arrayBuffer = e.target?.result;
      if (!arrayBuffer || typeof arrayBuffer === "string") {
        throw new Error("Could not read file");
      }
      const mimeType = getMimeTypes(arrayBuffer, file.type);
      resolve(mimeType);
    };
    reader.readAsArrayBuffer(file);
  });
}

FileReader and File seems to be missing, it works in Deno, but not in nodejs (which kinda make sense as node uses a different system for reading files) but I could find how to configure for a shim, seems like shim domException should contain File at least.

example of compile with DNT

import { build, emptyDir } from "https://deno.land/x/[email protected]/mod.ts";

// [...]

await build({
    entryPoints: ["./mod.ts"],
    outDir: "./npm",
    shims: {
      deno: "dev",
      blob: "dev",
      domException: "dev",
    },
    compilerOptions: {
      lib: ["esnext", "dom", "dom.iterable"],
      sourceMap: true,
      target: "ES2015",
    },
    // ...
  });