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index.ts
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index.ts
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function createEvents<F extends (args: A) => void, A>() {
let handlers: F[] = [];
return {
push(fn: F) {
handlers.push(fn);
return () => {
handlers = handlers.filter((handler) => handler !== fn);
};
},
call(args: A) {
handlers.forEach((fn) => fn(args));
},
};
}
export type Location = {
pathname: string;
search: string;
hash: string;
};
type Listener = (location: Location) => void;
export function createHistory() {
const listeners = createEvents<Listener, Location>();
function getLocation() {
return {
pathname: location.pathname,
search: location.search,
hash: location.hash,
}
}
function applyTransition() {
const location = getLocation();
listeners.call(location);
}
function go(i: number) {
history.go(i);
}
function listen(fn: (location: Location) => void) {
return listeners.push(fn);
}
function push(to: string) {
history.pushState({}, "", to);
applyTransition();
}
function replace(to: string) {
history.replaceState({}, "", to);
applyTransition();
}
window.addEventListener("popstate", () => {
applyTransition();
});
return {
listen,
go,
back() {
go(-1);
},
forward() {
go(1);
},
push,
replace,
};
}