61 lines
1.8 KiB
JavaScript
61 lines
1.8 KiB
JavaScript
const assert = require('assert');
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const vm = require('vm');
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const path = require('path');
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const { readFile } = require('fs').promises;
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const crypto = require('crypto');
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const { parseHTML } = require('linkedom');
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async function renderToString(events, stateEventMap) {
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assert(events);
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assert(stateEventMap);
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const dom = parseHTML(`
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<!doctype html>
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<html lang="en">
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<body>
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<div id="app" class="hydrogen"></div>
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</body>
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</html>
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`);
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if (!dom.requestAnimationFrame) {
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dom.requestAnimationFrame = function (cb) {
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setTimeout(cb, 0);
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};
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}
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const vmContext = vm.createContext(dom);
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// Make the dom properties available in sub-`require(...)` calls
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vmContext.global.window = dom.window;
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vmContext.global.document = dom.document;
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vmContext.global.Node = dom.Node;
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vmContext.global.navigator = dom.navigator;
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vmContext.global.DOMParser = dom.DOMParser;
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vmContext.global.crypto = crypto.webcrypto;
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// So require(...) works in the vm
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vmContext.global.require = require;
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// So we can see logs from the underlying vm
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vmContext.global.console = console;
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vmContext.global.INPUT_EVENTS = events;
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vmContext.global.INPUT_STATE_EVENT_MAP = stateEventMap;
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const hydrogenRenderScriptCode = await readFile(
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path.resolve(__dirname, './hydrogen-vm-render-script.js'),
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'utf8'
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);
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const hydrogenRenderScript = new vm.Script(hydrogenRenderScriptCode, {
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filename: 'hydrogen-vm-render-script.js',
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});
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const vmResult = hydrogenRenderScript.runInContext(vmContext);
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// Wait for everything to render
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// (waiting on the promise returned from `hydrogen-render-script.js`)
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await vmResult;
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const documentString = dom.document.querySelector('#app').toString();
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return documentString;
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}
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module.exports = renderToString;
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