53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
import type { Context } from './context';
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import { incrementId } from './context.js';
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import type { AstroPreactAttrs, PropNameToSignalMap, SignalLike } from './types';
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function isSignal(x: any): x is SignalLike {
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return x != null && typeof x === 'object' && typeof x.peek === 'function' && 'value' in x;
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}
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export function restoreSignalsOnProps(ctx: Context, props: Record<string, any>) {
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// Restore signal props that were mutated for serialization
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let propMap: PropNameToSignalMap;
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if (ctx.propsToSignals.has(props)) {
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propMap = ctx.propsToSignals.get(props)!;
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} else {
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propMap = new Map();
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ctx.propsToSignals.set(props, propMap);
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}
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for (const [key, signal] of propMap) {
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props[key] = signal;
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}
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return propMap;
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}
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export function serializeSignals(
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ctx: Context,
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props: Record<string, any>,
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attrs: AstroPreactAttrs,
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map: PropNameToSignalMap
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) {
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// Check for signals
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const signals: Record<string, string> = {};
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for (const [key, value] of Object.entries(props)) {
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if (isSignal(value)) {
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// Set the value to the current signal value
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// This mutates the props on purpose, so that it will be serialized correct.
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props[key] = value.peek();
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map.set(key, value);
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let id: string;
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if (ctx.signals.has(value)) {
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id = ctx.signals.get(value)!;
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} else {
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id = incrementId(ctx);
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ctx.signals.set(value, id);
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}
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signals[key] = id;
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}
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}
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if (Object.keys(signals).length) {
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attrs['data-preact-signals'] = JSON.stringify(signals);
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}
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}
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