src/vs/editor/common/services/editorSimpleWorker.ts/EditorSimpleWorker/computeDiff
class EditorSimpleWorker:	public async computeDiff(originalUrl: string, modifiedUrl: string, options: IDocumentDiffProviderOptions, algorithm: DiffAlgorithmName): Promise<IDiffComputationResult | null> {
		const original = this._getModel(originalUrl);
		const modified = this._getModel(modifiedUrl);
		if (!original || !modified) {
			return null;
		}

		return EditorSimpleWorker.computeDiff(original, modified, options, algorithm);
	}