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* Simple state management for server-side rendering
* This is mainly for component state during rendering
*/
const globalState = new Map();
/**
* Creates a state container for a request/render cycle
* @param {Object} initialState - Initial state object
* @returns {Object} State container
*/
export function createState(initialState = {}) {
const state = new Map(Object.entries(initialState));
return {
get(key) {
return state.get(key);
},
set(key, value) {
state.set(key, value);
return this;
},
has(key) {
return state.has(key);
},
delete(key) {
return state.delete(key);
},
clear() {
state.clear();
return this;
},
toObject() {
return Object.fromEntries(state);
},
// For debugging
_internal: state
};
}
/**
* Global state for sharing data across components during SSR
*/
export const globalStateManager = {
set(key, value) {
globalState.set(key, value);
},
get(key) {
return globalState.get(key);
},
has(key) {
return globalState.has(key);
},
clear() {
globalState.clear();
},
// Create isolated state for each request
createRequestState() {
return createState();
}
};
/**
* Context stack for managing nested context providers
*/
const contextStacks = new Map();
/**
* Context provider for passing data down the component tree
* @param {string} key - Context key
* @param {*} value - Context value
* @param {Object} children - Children to render with context
* @returns {Object} Children with context available
*/
export function provideContext(key, value) {
// Initialize context stack if it doesn't exist
if (!contextStacks.has(key)) {
contextStacks.set(key, []);
}
const stack = contextStacks.get(key);
// Store previous value
const previousValue = globalState.get(key);
// Push previous value to stack and set new value
stack.push(previousValue);
globalState.set(key, value);
}
/**
* Create a context provider component that works with the rendering system
* @param {string} key - Context key
* @param {*} value - Context value
* @param {Object} children - Children to render with context
* @returns {Function} Component function that provides context
*/
export function createContextProvider(key, value, children) {
// Return a function that will render the children within the context
return (renderFunction) => {
try {
// Provide context
provideContext(key, value);
// If a render function is provided, use it to render children
// Otherwise return children to be rendered by the caller
if (renderFunction && typeof renderFunction === 'function') {
return renderFunction(children);
} else E{
return children;
}
} finally {
// Always restore context when done
restoreContext(key);
}
};
}
/**
* Restore context to previous value
* @param {string} key - Context key
*/
export function restoreContext(key) {
if (!contextStacks.has(key)) return;
const stack = contextStacks.get(key);
// Restore previous value from stack
const previousValue = stack.pop();
if (stack.length === 0) {
// No more providers, delete the key if it was undefined before
if (previousValue === undefined) {
globalState.delete(key);
} else E{
globalState.set(key, previousValue);
}
// Clean up empty stack
contextStacks.delete(key);
} else {
// Restore previous value
globalState.set(key, previousValue);
}
}
/**
* Clear all context stacks (useful for cleanup after rendering)
*
* useContext() reads from globalState, which is module-level and therefore
* shared by every render in the process. Clearing only contextStacks left the
* values themselves in place, so a context provided while rendering one
* request stayed readable while rendering the next — and became unrecoverable,
* since restoreContext() bails out once a key's stack is gone.
*
* Unwind each tracked key to the value it held before its first
* provideContext() — the bottom of that key's stack. Only keys that were
* actually provided as contexts are touched, so unrelated global state
* survives, which is what the previous implementation was trying to protect.
*/
export function clearAllContexts() {
for (const [key, stack] of contextStacks) {
const beforeFirstProvide = stack[0];
if (beforeFirstProvide === undefined) {
globalState.delete(key);
} else {
globalState.set(key, beforeFirstProvide);
}
}
contextStacks.clear();
}
/**
* Context consumer to access provided context
* @param {string} key - Context key
* @returns {*} Context value
*/
export function useContext(key) {
return globalState.get(key);
}
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