findTransitiveImports(chunk, entries = this.entries) {
		const ownCss = this.findCssImports(chunk);

		const css = new Map();
		const js = new Map();
		for (const dyn of chunk.dynamicImports) {
			const imp = this.findCssImports(this.bundle[dyn]).filter(f => !ownCss.includes(f));
			if (imp.length) {
				css.set(dyn, imp);
			}
			const jsImp = this.findJsImports(this.bundle[dyn], [], new Set(entries));
			if (jsImp.length) {
				js.set(dyn, jsImp);
			}
		}

		return { css, js };
	}
Find JS and CSS imports within the modules dynamically imported by a chunk.
@param {Chunk} chunk
@param {Iterable<string>} [entries]
@returns {{ css: Map<string, string[]>, js: Map<string, string[]> }}