@angular-devkit/build-optimizer

const buildOptimizerLoaderPath: string;

buildOptimizer: (options: BuildOptimizerOptions) => TransformJavascriptOutput;

buildOptimizerLoader: (
    this: {
        resourcePath: string;
        _module: {
            factoryMeta: { skipBuildOptimizer?: boolean; sideEffectFree?: boolean };
        };
        cacheable(): void;
        callback(error?: Error | null, content?: string, sourceMap?: unknown): void;
        getOptions(): unknown;
    },
    content: string,
    previousSourceMap: RawSourceMap
) => void;

getPrefixClassesTransformer: () => ts.TransformerFactory<ts.SourceFile>;

getPrefixFunctionsTransformer: () => ts.TransformerFactory<ts.SourceFile>;

getScrubFileTransformer: (
    program?: ts.Program
) => ts.TransformerFactory<ts.SourceFile>;

getScrubFileTransformerForCore: (
    program?: ts.Program
) => ts.TransformerFactory<ts.SourceFile>;

getWrapEnumsTransformer: () => ts.TransformerFactory<ts.SourceFile>;

transformJavascript: (
    options: TransformJavascriptOptions
) => TransformJavascriptOutput;