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53 lines
1.5 KiB
JavaScript

"use strict";
const babelCore = require("@babel/core");
const Module = require("module").Module;
const fs = require("fs");
function transpile(code, filename) {
return babelCore.transformSync(code, {filename,
plugins: [
require.resolve("@babel/plugin-proposal-export-namespace-from"),
require.resolve("@babel/plugin-transform-modules-commonjs")
]
});
}
let oldJSLoader, oldMJSLoader;
module.exports = {
register: function () {
// NOTE: We only capture these at register time, to ensure that we don't interfere with any other custom require hooks
oldJSLoader = Module._extensions[".js"];
oldMJSLoader = Module._extensions[".mjs"];
let newLoader = function (mod, filename) {
try {
return oldJSLoader(mod, filename);
} catch (error) {
if (error.code === "ERR_REQUIRE_ESM") {
// NOTE: We completely bypass the default internal loader, as we cannot patch the `type: module` check out of that. Please open a PR if you have a better solution!
let code = fs.readFileSync(filename, "utf8");
let transpiledCode = transpile(code, filename);
mod._compile(transpiledCode.code, filename);
} else {
throw error;
}
}
}
Module._extensions[".js"] = newLoader;
Module._extensions[".mjs"] = newLoader;
},
unregister: function () {
Module._extensions[".js"] = oldJSLoader;
Module._extensions[".mjs"] = oldMJSLoader;
},
require: function (... args) {
this.register();
let required = require(... args);
this.unregister();
return required;
}
};