builder.ts
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builder.ts
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	export abstract class Builder {
	abstract ownsFile(file_path: string): boolean;
	abstract getName(): string;
	abstract _build(): Promise<void>;
	abstract dispose(): Promise<void>;

	constructor(public project_dir: string, public style_dirs: string[]) {}

	public ongoing_build: Promise<void> \| null = null;

	public build(notifier?: (message: string) => void) {
	if (!this.ongoing_build) {
	const build = this._build()
	.catch((err) => {
	console.error(err);
	})
	.then(() => {
	notifier?.(this.getName());
	this.ongoing_build = null;
	});
	this.ongoing_build = build;
	}
	return this.ongoing_build;
	}
	}