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import React from 'react';
import { getApolloContext } from '@apollo/react-common';
import { RenderPromises } from '@apollo/react-hooks';
export function getDataFromTree(
tree: React.ReactNode,
context: { [key: string]: any } = {}
) {
return getMarkupFromTree({
tree,
context,
// If you need to configure this renderFunction, call getMarkupFromTree
// directly instead of getDataFromTree.
renderFunction: require('react-dom/server').renderToStaticMarkup
});
}
export type GetMarkupFromTreeOptions = {
tree: React.ReactNode;
context?: { [key: string]: any };
renderFunction?: (tree: React.ReactElement<any>) => string;
};
export function getMarkupFromTree({
tree,
context = {},
// The rendering function is configurable! We use renderToStaticMarkup as
// the default, because it's a little less expensive than renderToString,
// and legacy usage of getDataFromTree ignores the return value anyway.
renderFunction = require('react-dom/server').renderToStaticMarkup
}: GetMarkupFromTreeOptions): Promise<string> {
const renderPromises = new RenderPromises();
function process(): Promise<string> | string {
// Always re-render from the rootElement, even though it might seem
// better to render the children of the component responsible for the
// promise, because it is not possible to reconstruct the full context
// of the original rendering (including all unknown context provider
// elements) for a subtree of the original component tree.
const ApolloContext = getApolloContext();
const html = renderFunction(
React.createElement(
ApolloContext.Provider,
{ value: { ...context, renderPromises } },
tree
)
);
return renderPromises.hasPromises()
? renderPromises.consumeAndAwaitPromises().then(process)
: html;
}
return Promise.resolve().then(process);
}