run-loader.js

const fs = require("fs");
const path = require("path");
const { runLoaders } = require("loader-runner");

runLoaders(
  {
    resource: "./demo.txt",
    loaders: [
      {
        loader: path.resolve(__dirname, "./loaders/demo-loader"),
        options: {
          name: "demo.[ext]",
        },
      },
      path.resolve(__dirname, "./loaders/pitch-loader"),
    ],
    context: {
      emitFile: () => {},
    },
    readResource: fs.readFile.bind(fs),
  },
  (err, result) => (err ? console.error(err) : console.log(result))
);