page.ts
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page.ts
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	import Router from "@koa/router";
	import { BaseContext } from "koa";

	import { FlatTemplatable, Templatable, tempstream } from "tempstream";
	import { AllQueryParams } from "..";
	import { FormDataValue } from "../forms/form";
	import { Fields, Mountable, PageErrorMessage } from "./mountable";
	import { PagePropsParser } from "./props-parser";

	export abstract class Page<
	F extends Fields = Record<string, never>
	> extends Mountable<F> {
	propsParser: PagePropsParser<Record<keyof Fields, unknown>> =
	new AllQueryParams();
	controls = [];

	mount(router: Router, path: string): void {
	router.get(path, async (ctx) => {
	ctx.body = await this.render(ctx);
	});
	}

	// eslint-disable-next-line @typescript-eslint/no-unused-vars
	async canAccess(_: BaseContext) {
	return { canAccess: true, message: "" };
	}

	async renderError(
	_: BaseContext,
	error: PageErrorMessage
	): Promise<FlatTemplatable> {
	return tempstream/* HTML */ `<div>${error.message}</div>`;
	}

	public abstract render(ctx: BaseContext): Promise<FlatTemplatable>;

	extractRawValues(ctx: BaseContext): Record<string, FormDataValue> {
	return this.propsParser.decode(ctx);
	}
	}