95 lines
2.5 KiB
TypeScript
95 lines
2.5 KiB
TypeScript
type ContextStore = Record<string, any>;
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const contextStack: ContextStore[] = [];
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const defaultContext: ContextStore = {};
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const debug = JSON.parse(localStorage.getItem("debug") || "false");
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export function setDefaultContext(context: ContextStore) {
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Object.assign(defaultContext, context);
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}
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export function withContext<T>(context: ContextStore, fn: () => T): T {
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contextStack.push(context);
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try {
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return fn();
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} finally {
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contextStack.pop();
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}
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}
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export const ctx = new Proxy(
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{},
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{
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get(_, prop: string) {
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for (let i = contextStack.length - 1; i >= 0; i--) {
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if (prop in contextStack[i]) return contextStack[i][prop];
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}
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if (prop in defaultContext) return defaultContext[prop];
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throw new Error(`Context variable '${prop}' is not defined.`);
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},
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},
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) as Record<string, unknown>;
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export function getContext() {
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return ctx;
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}
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export function getContextItem<T>(prop: string): T {
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return ctx[prop] as T;
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}
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export function getContextItemOrDefault<T>(prop: string, defaultValue: T): T {
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try {
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return ctx[prop] as T;
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} catch {
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return defaultValue;
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}
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}
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export function setContextItem<T>(prop: string, value: T) {
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Object.assign(contextStack[contextStack.length - 1] ?? defaultContext, {
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[prop]: value,
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});
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}
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if (debug) {
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setInterval(() => {
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let ctxEl = document.getElementById("context");
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if (!ctxEl) {
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ctxEl = document.createElement("div");
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ctxEl.id = "context";
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document.body.append(ctxEl);
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}
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ctxEl.innerHTML = "";
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const div = document.createElement("div");
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const pre = document.createElement("pre");
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const h3 = document.createElement("h3");
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h3.textContent = "Default";
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div.append(h3);
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pre.textContent = safeStringify(defaultContext);
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div.append(pre);
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ctxEl.append(div);
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for (const [idx, ctx] of contextStack.entries()) {
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const div = document.createElement("div");
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const pre = document.createElement("pre");
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const h3 = document.createElement("h3");
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h3.textContent = "CTX " + idx;
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div.append(h3);
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pre.textContent = safeStringify(ctx);
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div.append(pre);
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ctxEl.append(div);
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}
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}, 1000);
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}
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function safeStringify(obj: any) {
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const seen = new WeakSet();
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return JSON.stringify(obj, (key, value) => {
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if (typeof value === "object" && value !== null) {
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if (seen.has(value)) {
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return "[Circular]"; // Replace circular references
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}
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seen.add(value);
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}
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return value;
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}, 2);
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}
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