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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 | 27x 121x 288x 121x 96x 27x 296x 6x 2x 294x 6x 288x 246x 121x 121x 121x 121x 121x 96x 96x 96x 96x 96x 2x 1x 2x 96x 2x 96x 18x 96x 24x 72x 25x 25x 97x 93x 10x 88x 125x 8x 8x 8x 2x 2x 6x 8x 8x 4x 6x 117x 117x 69x 119x 118x 42x 42x 88x 27x 42x 84x 42x 42x 190x 27x 27x 24x 24x 42x 27x 61x 42x 42x 24x 18x 24x 24x 23x 1x 18x 18x 1x 1x 1x | import * as React from 'react'; export interface Context { [key: string]: any; } interface PromiseTreeArgument { rootElement: React.ReactNode; rootContext?: Context; } interface FetchComponent extends React.Component<any> { fetchData(): Promise<void>; } interface PromiseTreeResult { promise: Promise<any>; context: Context; instance: FetchComponent; } interface PreactElement<P> { attributes: P; } function getProps<P>(element: React.ReactElement<P> | PreactElement<P>): P { return (element as React.ReactElement<P>).props || (element as PreactElement<P>).attributes; } function isReactElement(element: React.ReactNode): element is React.ReactElement<any> { return !!(element as any).type; } function isComponentClass(Comp: React.ComponentType<any>): Comp is React.ComponentClass<any> { return Comp.prototype && (Comp.prototype.render || Comp.prototype.isReactComponent); } function providesChildContext( instance: React.Component<any>, ): instance is React.Component<any> & React.ChildContextProvider<any> { return !!(instance as any).getChildContext; } // Recurse a React Element tree, running visitor on each element. // If visitor returns `false`, don't call the element's render function // or recurse into its child elements. export function walkTree( element: React.ReactNode, context: Context, visitor: ( element: React.ReactNode, instance: React.Component<any> | null, context: Context, childContext?: Context, ) => boolean | void, ) { if (Array.isArray(element)) { element.forEach(item => walkTree(item, context, visitor)); return; } if (!element) { return; } // A stateless functional component or a class if (isReactElement(element)) { if (typeof element.type === 'function') { const Comp = element.type; const props = Object.assign({}, Comp.defaultProps, getProps(element)); let childContext = context; let child; // Are we are a react class? if (isComponentClass(Comp)) { const instance = new Comp(props, context); // In case the user doesn't pass these to super in the constructor instance.props = instance.props || props; instance.context = instance.context || context; // Set the instance state to null (not undefined) if not set, to match React behaviour instance.state = instance.state || null; // Override setState to just change the state, not queue up an update // (we can't do the default React thing as we aren't mounted // "properly", however we don't need to re-render as we only support // setState in componentWillMount, which happens *before* render). instance.setState = newState => { if (typeof newState === 'function') { // React's TS type definitions don't contain context as a third parameter for // setState's updater function. // Remove this cast to `any` when that is fixed. newState = (newState as any)(instance.state, instance.props, instance.context); } instance.state = Object.assign({}, instance.state, newState); }; if (instance.componentWillMount) { instance.componentWillMount(); } if (providesChildContext(instance)) { childContext = Object.assign({}, context, instance.getChildContext()); } if (visitor(element, instance, context, childContext) === false) { return; } child = instance.render(); } else { // Just a stateless functional Iif (visitor(element, null, context) === false) { return; } child = Comp(props, context); } if (child) { if (Array.isArray(child)) { child.forEach(item => walkTree(item, childContext, visitor)); } else { walkTree(child, childContext, visitor); } } } else if ((element.type as any)._context || (element.type as any).Consumer) { // A React context provider or consumer Iif (visitor(element, null, context) === false) { return; } let child; if ((element.type as any)._context) { // A provider - sets the context value before rendering children ((element.type as any)._context as any)._currentValue = element.props.value; child = element.props.children; } else { // A consumer child = element.props.children((element.type as any)._currentValue); } Eif (child) { if (Array.isArray(child)) { child.forEach(item => walkTree(item, context, visitor)); } else { walkTree(child, context, visitor); } } } else { // A basic string or dom element, just get children Iif (visitor(element, null, context) === false) { return; } if (element.props && element.props.children) { React.Children.forEach(element.props.children, (child: any) => { if (child) { walkTree(child, context, visitor); } }); } } } else Eif (typeof element === 'string' || typeof element === 'number') { // Just visit these, they are leaves so we don't keep traversing. visitor(element, null, context); } // TODO: Portals? } function hasFetchDataFunction(instance: React.Component<any>): instance is FetchComponent { return typeof (instance as any).fetchData === 'function'; } function isPromise<T>(promise: Object): promise is Promise<T> { return typeof (promise as any).then === 'function'; } function getPromisesFromTree({ rootElement, rootContext = {}, }: PromiseTreeArgument): PromiseTreeResult[] { const promises: PromiseTreeResult[] = []; walkTree(rootElement, rootContext, (_, instance, context, childContext) => { if (instance && hasFetchDataFunction(instance)) { const promise = instance.fetchData(); if (isPromise<Object>(promise)) { promises.push({ promise, context: childContext || context, instance }); return false; } } }); return promises; } export default function getDataFromTree( rootElement: React.ReactNode, rootContext: any = {}, ): Promise<any> { const promises = getPromisesFromTree({ rootElement, rootContext }); if (!promises.length) { return Promise.resolve(); } const errors: any[] = []; const mappedPromises = promises.map(({ promise, context, instance }) => { return promise .then(_ => getDataFromTree(instance.render(), context)) .catch(e => errors.push(e)); }); return Promise.all(mappedPromises).then(_ => { if (errors.length > 0) { const error = errors.length === 1 ? errors[0] : new Error( `${errors.length} errors were thrown when executing your fetchData functions.`, ); error.queryErrors = errors; throw error; } }); } |