How to use the jest-cli/src/lib/moduleMocker.getMetadata function in jest-cli

_generateMock(moduleId, ignoreManualMock) {

        let module;

        if (!this._mockMetaDataCache.hasOwnProperty(moduleId)) {
            let origMockRegistry;
            let origModuleRegistry;

            // This allows us to handle circular dependencies while generating an
            // automock.
            this._mockMetaDataCache[moduleId] = moduleMocker.getMetadata({});

            // In order to avoid it being possible for automocking to potentially cause
            // side-effects within the module environment, we need to execute the module
            // in isolation. This accomplishes that by temporarily clearing out the
            // module and mock registries while the module being analyzed is executed.
            //
            // An example scenario where this could cause issue is if the module being
            // mocked has calls into side-effectful APIs on another module.
            origMockRegistry = this._mockRegistry;
            origModuleRegistry = this._environment.global.installedModules;
            this._mockRegistry = {};
            this._environment.global.installedModules = {};

            module = this._webpackRequireModule(moduleId);

            // Restore the "real" module/mock registries

// module and mock registries while the module being analyzed is executed.
            //
            // An example scenario where this could cause issue is if the module being
            // mocked has calls into side-effectful APIs on another module.
            origMockRegistry = this._mockRegistry;
            origModuleRegistry = this._environment.global.installedModules;
            this._mockRegistry = {};
            this._environment.global.installedModules = {};

            module = this._webpackRequireModule(moduleId);

            // Restore the "real" module/mock registries
            this._mockRegistry = origMockRegistry;
            this._environment.global.installedModules = origModuleRegistry;

            this._mockMetaDataCache[moduleId] = moduleMocker.getMetadata(module);
        }

        // Check whether a manual mock was registered as a result of running the module
        // via `jest._registerManualMock` / the `ManualMockLoader`.
        if (!ignoreManualMock && this._manualMockMap.hasOwnProperty(moduleId)) {
            return this._webpackRequireModule(this._manualMockMap[moduleId]);
        }

        return moduleMocker.generateFromMetadata(this._mockMetaDataCache[moduleId]);
    }