findEntryChunks() {
		const entries = new Set();
		for (const fileName in this.bundle) {
			const chunk = this.bundle[fileName];
			if (chunk.type !== 'chunk' || !chunk.isEntry) continue;
			entries.add(fileName);
			for (const f of this.findJsImports(chunk, [], entries)) {
				entries.add(f);
			}
		}
		return entries;
	}
Get entry chunks and any non-lazy (statically imported) child chunks.
@returns {Set<string>}