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82 lines
2.4 KiB
JavaScript
82 lines
2.4 KiB
JavaScript
"use strict";
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const Promise = require("bluebird");
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const React = require("react");
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const ReactDOMServer = require("react-dom/server");
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const defaultValue = require("default-value");
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const dotty = require("dotty");
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const registerBabel = require("./register-babel");
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const clearRequireCache = require("./clear-require-cache");
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/* FILEBUG: Express does not copy symbol-keyed properties from app.locals, but it probably should? */
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// let ExpressReact = Symbol("ExpressReact");
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let ExpressReact = "__EXPRESS_REACT_SETTINGS";
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let LocalsContext = React.createContext({});
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function componentAtPath(moduleRoot, componentPath) {
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if (componentPath == null) {
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return moduleRoot;
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} else {
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return dotty.get(moduleRoot, componentPath);
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}
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}
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function renderComponent(component, locals, doctype = "<!DOCTYPE html>") {
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let tree = React.createElement(LocalsContext.Provider, {value: locals},
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React.createElement(component, locals)
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);
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try {
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/* TODO: Expose internals? Like koa-react */
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return doctype + ReactDOMServer.renderToStaticMarkup(tree);
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} catch (err) {
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if (/Element type is invalid:/.test(err.message)) {
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throw new Error(`Expected a React component, but got '${component}' - maybe you forgot to specify a componentPath?`);
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} else {
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throw err;
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}
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}
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}
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module.exports = {
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Settings: ExpressReact,
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LocalsContext: LocalsContext,
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createEngine: function createEngine({ prepare } = {}) {
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let babelRegistered = false;
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return function asyncRender(filename, options, callback) {
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return Promise.try(() => {
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let viewPaths = options.settings.views;
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if (!babelRegistered) {
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registerBabel(viewPaths);
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babelRegistered = true;
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}
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let {componentPath} = defaultValue(options[ExpressReact], {});
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return Promise.try(() => {
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let templateFile = require(filename);
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let moduleRoot = defaultValue(templateFile.exports, templateFile);
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return Promise.try(() => {
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if (prepare != null) {
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return prepare(moduleRoot, options);
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}
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}).then((result) => {
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console.log("QUERY RESULT:", require("util").inspect(result, { colors: true, depth: null }));
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let mergedOptions = Object.assign({}, options, result);
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return renderComponent(componentAtPath(moduleRoot, componentPath), mergedOptions);
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});
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}).finally(() => {
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if (options.settings.env === "development") {
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clearRequireCache(viewPaths);
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}
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});
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}).asCallback(callback);
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};
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}
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};
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