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'use strict';
const { ModuleWrap } = internalBinding('module_wrap');
const debug = require('util').debuglog('esm');
const ArrayJoin = Function.call.bind(Array.prototype.join);
const ArrayMap = Function.call.bind(Array.prototype.map);
const createDynamicModule = (exports, url = '', evaluate) => {
debug(
`creating ESM facade for ${url} with exports: ${ArrayJoin(exports, ', ')}`
);
const names = ArrayMap(exports, (name) => `${name}`);
// Create two modules: One whose exports are get- and set-able ('reflective'),
// and one which re-exports all of these but additionally may
// run an executor function once everything is set up.
const src = `
export let executor;
${ArrayJoin(ArrayMap(names, (name) => `export let $${name};`), '\n')}
/* This function is implicitly returned as the module's completion value */
(() => ({
setExecutor: fn => executor = fn,
reflect: {
exports: { ${
ArrayJoin(ArrayMap(names, (name) => `
${name}: {
get: () => $${name},
set: v => $${name} = v
}`), ', \n')}
}
}
}));`;
const reflectiveModule = new ModuleWrap(src, `cjs-facade:${url}`);
reflectiveModule.instantiate();
const { setExecutor, reflect } = reflectiveModule.evaluate(-1, false)();
// public exposed ESM
const reexports = `
import {
executor,
${ArrayMap(names, (name) => `$${name}`)}
} from "";
export {
${ArrayJoin(ArrayMap(names, (name) => `$${name} as ${name}`), ', ')}
}
if (typeof executor === "function") {
// add await to this later if top level await comes along
executor()
}`;
if (typeof evaluate === 'function') {
setExecutor(() => evaluate(reflect));
}
const module = new ModuleWrap(reexports, `${url}`);
module.link(async () => reflectiveModule);
module.instantiate();
reflect.namespace = module.namespace();
return {
module,
reflect,
};
};
module.exports = createDynamicModule;
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