svgo

loadConfig: {
    (configFile: string, cwd?: string): Promise<Config>;
    (configFile?: null, cwd?: string): Promise<Config>;
};

optimize: (input: string, config?: Config) => Output;

type Config = {
    /** Can be used by plugins, for example prefixids */
    path?: string;
    /** Pass over SVGs multiple times to ensure all optimizations are applied. */
    multipass?: boolean;
    /** Precision of floating point numbers. Will be passed to each plugin that supports this param. */
    floatPrecision?: number;
    /**
     * Plugins configuration
     * ['preset-default'] is default
     * Can also specify any builtin plugin
     * ['sortAttrs', { name: 'prefixIds', params: { prefix: 'my-prefix' } }]
     * Or custom
     * [{ name: 'myPlugin', fn: () => ({}) }]
     */
    plugins?: PluginConfig[];
    /** Options for rendering optimized SVG from AST. */
    js2svg?: StringifyOptions;
    /** Output as Data URI string. */
    datauri?: DataUri;
};

type CustomPlugin = {
    name: string;
    fn: PluginFn<void>;
};

type Output = {
    data: string;
};

type PluginConfig =
    | keyof BuiltinsWithOptionalParams
    | {
          [Name in keyof BuiltinsWithOptionalParams]: {
              name: Name;
              params?: BuiltinsWithOptionalParams[Name];
          };
      }[keyof BuiltinsWithOptionalParams]
    | {
          [Name in keyof BuiltinsWithRequiredParams]: {
              name: Name;
              params: BuiltinsWithRequiredParams[Name];
          };
      }[keyof BuiltinsWithRequiredParams]
    | CustomPlugin;