html.ts
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html.ts
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	import { Context } from "koa";
	import { FlatTemplatable } from "tempstream";
	import { FormDataValue, FormMessage } from "../form";
	import { FormControl } from "./controls";
	import { FormControlContext } from "./form-control";

	type Renderer =
	\| ((fctx: FormControlContext) => FlatTemplatable)
	\| FlatTemplatable;

	export class HTML extends FormControl {
	role = (<const>"decoration") as "decoration" \| "submit";
	public renderer: Renderer;

	constructor(role: "decoration" \| "submit", renderer: Renderer);
	constructor(renderer: Renderer);
	constructor(
	role_or_renderer: "decoration" \| "submit" \| Renderer,
	renderer_or_undefined?: Renderer \| FlatTemplatable
	) {
	super();
	if (arguments.length == 2) {
	this.role = role_or_renderer as "decoration" \| "submit";
	this.renderer = renderer_or_undefined as Renderer;
	} else {
	this.renderer = role_or_renderer;
	}
	}

	async render(fctx: FormControlContext): Promise<FlatTemplatable> {
	if (typeof this.renderer === "string") {
	return this.renderer;
	}
	return typeof this.renderer == "function"
	? this.renderer(fctx)
	: this.renderer;
	}
	}