loader.js


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import path from "path";
import fs from "fs";

export function resolve(specifier, context, nextResolve) {
  const { parentURL = null } = context;

  if (specifier.startsWith("$")) {
    if (specifier.startsWith("$config")) {
      specifier = "file://" + path.resolve(".") + "/config.js";
    } else if (specifier.startsWith("$")) {
      specifier =
        specifier.replace(/^\$/, "file://" + path.resolve(".") + "/") + ".js";
    }

    return {
      shortCircuit: true,
      url: new URL(specifier).href,
    };
  }

  return nextResolve(specifier, context);
}