/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { _isNumberValue } from '@angular/cdk/coercion'; import { DataSource } from '@angular/cdk/table'; import { BehaviorSubject, combineLatest, merge, of as observableOf, Subject, } from 'rxjs'; import { map } from 'rxjs/operators'; /** * Corresponds to `Number.MAX_SAFE_INTEGER`. Moved out into a variable here due to * flaky browser support and the value not being defined in Closure's typings. */ const MAX_SAFE_INTEGER = 9007199254740991; /** Shared base class with MDC-based implementation. */ export class _MatTableDataSource extends DataSource { constructor(initialData = []) { super(); /** Stream emitting render data to the table (depends on ordered data changes). */ this._renderData = new BehaviorSubject([]); /** Stream that emits when a new filter string is set on the data source. */ this._filter = new BehaviorSubject(''); /** Used to react to internal changes of the paginator that are made by the data source itself. */ this._internalPageChanges = new Subject(); /** * Subscription to the changes that should trigger an update to the table's rendered rows, such * as filtering, sorting, pagination, or base data changes. */ this._renderChangesSubscription = null; /** * Data accessor function that is used for accessing data properties for sorting through * the default sortData function. * This default function assumes that the sort header IDs (which defaults to the column name) * matches the data's properties (e.g. column Xyz represents data['Xyz']). * May be set to a custom function for different behavior. * @param data Data object that is being accessed. * @param sortHeaderId The name of the column that represents the data. */ this.sortingDataAccessor = (data, sortHeaderId) => { const value = data[sortHeaderId]; if (_isNumberValue(value)) { const numberValue = Number(value); // Numbers beyond `MAX_SAFE_INTEGER` can't be compared reliably so we // leave them as strings. For more info: https://goo.gl/y5vbSg return numberValue < MAX_SAFE_INTEGER ? numberValue : value; } return value; }; /** * Gets a sorted copy of the data array based on the state of the MatSort. Called * after changes are made to the filtered data or when sort changes are emitted from MatSort. * By default, the function retrieves the active sort and its direction and compares data * by retrieving data using the sortingDataAccessor. May be overridden for a custom implementation * of data ordering. * @param data The array of data that should be sorted. * @param sort The connected MatSort that holds the current sort state. */ this.sortData = (data, sort) => { const active = sort.active; const direction = sort.direction; if (!active || direction == '') { return data; } return data.sort((a, b) => { let valueA = this.sortingDataAccessor(a, active); let valueB = this.sortingDataAccessor(b, active); // If there are data in the column that can be converted to a number, // it must be ensured that the rest of the data // is of the same type so as not to order incorrectly. const valueAType = typeof valueA; const valueBType = typeof valueB; if (valueAType !== valueBType) { if (valueAType === 'number') { valueA += ''; } if (valueBType === 'number') { valueB += ''; } } // If both valueA and valueB exist (truthy), then compare the two. Otherwise, check if // one value exists while the other doesn't. In this case, existing value should come last. // This avoids inconsistent results when comparing values to undefined/null. // If neither value exists, return 0 (equal). let comparatorResult = 0; if (valueA != null && valueB != null) { // Check if one value is greater than the other; if equal, comparatorResult should remain 0. if (valueA > valueB) { comparatorResult = 1; } else if (valueA < valueB) { comparatorResult = -1; } } else if (valueA != null) { comparatorResult = 1; } else if (valueB != null) { comparatorResult = -1; } return comparatorResult * (direction == 'asc' ? 1 : -1); }); }; /** * Checks if a data object matches the data source's filter string. By default, each data object * is converted to a string of its properties and returns true if the filter has * at least one occurrence in that string. By default, the filter string has its whitespace * trimmed and the match is case-insensitive. May be overridden for a custom implementation of * filter matching. * @param data Data object used to check against the filter. * @param filter Filter string that has been set on the data source. * @returns Whether the filter matches against the data */ this.filterPredicate = (data, filter) => { // Transform the data into a lowercase string of all property values. const dataStr = Object.keys(data).reduce((currentTerm, key) => { // Use an obscure Unicode character to delimit the words in the concatenated string. // This avoids matches where the values of two columns combined will match the user's query // (e.g. `Flute` and `Stop` will match `Test`). The character is intended to be something // that has a very low chance of being typed in by somebody in a text field. This one in // particular is "White up-pointing triangle with dot" from // https://en.wikipedia.org/wiki/List_of_Unicode_characters return currentTerm + data[key] + '◬'; }, '').toLowerCase(); // Transform the filter by converting it to lowercase and removing whitespace. const transformedFilter = filter.trim().toLowerCase(); return dataStr.indexOf(transformedFilter) != -1; }; this._data = new BehaviorSubject(initialData); this._updateChangeSubscription(); } /** Array of data that should be rendered by the table, where each object represents one row. */ get data() { return this._data.value; } set data(data) { this._data.next(data); // Normally the `filteredData` is updated by the re-render // subscription, but that won't happen if it's inactive. if (!this._renderChangesSubscription) { this._filterData(data); } } /** * Filter term that should be used to filter out objects from the data array. To override how * data objects match to this filter string, provide a custom function for filterPredicate. */ get filter() { return this._filter.value; } set filter(filter) { this._filter.next(filter); // Normally the `filteredData` is updated by the re-render // subscription, but that won't happen if it's inactive. if (!this._renderChangesSubscription) { this._filterData(this.data); } } /** * Instance of the MatSort directive used by the table to control its sorting. Sort changes * emitted by the MatSort will trigger an update to the table's rendered data. */ get sort() { return this._sort; } set sort(sort) { this._sort = sort; this._updateChangeSubscription(); } /** * Instance of the MatPaginator component used by the table to control what page of the data is * displayed. Page changes emitted by the MatPaginator will trigger an update to the * table's rendered data. * * Note that the data source uses the paginator's properties to calculate which page of data * should be displayed. If the paginator receives its properties as template inputs, * e.g. `[pageLength]=100` or `[pageIndex]=1`, then be sure that the paginator's view has been * initialized before assigning it to this data source. */ get paginator() { return this._paginator; } set paginator(paginator) { this._paginator = paginator; this._updateChangeSubscription(); } /** * Subscribe to changes that should trigger an update to the table's rendered rows. When the * changes occur, process the current state of the filter, sort, and pagination along with * the provided base data and send it to the table for rendering. */ _updateChangeSubscription() { var _a; // Sorting and/or pagination should be watched if MatSort and/or MatPaginator are provided. // The events should emit whenever the component emits a change or initializes, or if no // component is provided, a stream with just a null event should be provided. // The `sortChange` and `pageChange` acts as a signal to the combineLatests below so that the // pipeline can progress to the next step. Note that the value from these streams are not used, // they purely act as a signal to progress in the pipeline. const sortChange = this._sort ? merge(this._sort.sortChange, this._sort.initialized) : observableOf(null); const pageChange = this._paginator ? merge(this._paginator.page, this._internalPageChanges, this._paginator.initialized) : observableOf(null); const dataStream = this._data; // Watch for base data or filter changes to provide a filtered set of data. const filteredData = combineLatest([dataStream, this._filter]) .pipe(map(([data]) => this._filterData(data))); // Watch for filtered data or sort changes to provide an ordered set of data. const orderedData = combineLatest([filteredData, sortChange]) .pipe(map(([data]) => this._orderData(data))); // Watch for ordered data or page changes to provide a paged set of data. const paginatedData = combineLatest([orderedData, pageChange]) .pipe(map(([data]) => this._pageData(data))); // Watched for paged data changes and send the result to the table to render. (_a = this._renderChangesSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe(); this._renderChangesSubscription = paginatedData.subscribe(data => this._renderData.next(data)); } /** * Returns a filtered data array where each filter object contains the filter string within * the result of the filterTermAccessor function. If no filter is set, returns the data array * as provided. */ _filterData(data) { // If there is a filter string, filter out data that does not contain it. // Each data object is converted to a string using the function defined by filterTermAccessor. // May be overridden for customization. this.filteredData = (this.filter == null || this.filter === '') ? data : data.filter(obj => this.filterPredicate(obj, this.filter)); if (this.paginator) { this._updatePaginator(this.filteredData.length); } return this.filteredData; } /** * Returns a sorted copy of the data if MatSort has a sort applied, otherwise just returns the * data array as provided. Uses the default data accessor for data lookup, unless a * sortDataAccessor function is defined. */ _orderData(data) { // If there is no active sort or direction, return the data without trying to sort. if (!this.sort) { return data; } return this.sortData(data.slice(), this.sort); } /** * Returns a paged slice of the provided data array according to the provided MatPaginator's page * index and length. If there is no paginator provided, returns the data array as provided. */ _pageData(data) { if (!this.paginator) { return data; } const startIndex = this.paginator.pageIndex * this.paginator.pageSize; return data.slice(startIndex, startIndex + this.paginator.pageSize); } /** * Updates the paginator to reflect the length of the filtered data, and makes sure that the page * index does not exceed the paginator's last page. Values are changed in a resolved promise to * guard against making property changes within a round of change detection. */ _updatePaginator(filteredDataLength) { Promise.resolve().then(() => { const paginator = this.paginator; if (!paginator) { return; } paginator.length = filteredDataLength; // If the page index is set beyond the page, reduce it to the last page. if (paginator.pageIndex > 0) { const lastPageIndex = Math.ceil(paginator.length / paginator.pageSize) - 1 || 0; const newPageIndex = Math.min(paginator.pageIndex, lastPageIndex); if (newPageIndex !== paginator.pageIndex) { paginator.pageIndex = newPageIndex; // Since the paginator only emits after user-generated changes, // we need our own stream so we know to should re-render the data. this._internalPageChanges.next(); } } }); } /** * Used by the MatTable. Called when it connects to the data source. * @docs-private */ connect() { if (!this._renderChangesSubscription) { this._updateChangeSubscription(); } return this._renderData; } /** * Used by the MatTable. Called when it disconnects from the data source. * @docs-private */ disconnect() { var _a; (_a = this._renderChangesSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe(); this._renderChangesSubscription = null; } } /** * Data source that accepts a client-side data array and includes native support of filtering, * sorting (using MatSort), and pagination (using MatPaginator). * * Allows for sort customization by overriding sortingDataAccessor, which defines how data * properties are accessed. Also allows for filter customization by overriding filterTermAccessor, * which defines how row data is converted to a string for filter matching. * * **Note:** This class is meant to be a simple data source to help you get started. As such * it isn't equipped to handle some more advanced cases like robust i18n support or server-side * interactions. If your app needs to support more advanced use cases, consider implementing your * own `DataSource`. */ export class MatTableDataSource extends _MatTableDataSource { } //# 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Moved out into a variable here due to\n * flaky browser support and the value not being defined in Closure's typings.\n */\nconst MAX_SAFE_INTEGER = 9007199254740991;\n\n/**\n * Interface that matches the required API parts for the MatPaginator's PageEvent.\n * Decoupled so that users can depend on either the legacy or MDC-based paginator.\n */\nexport interface MatTableDataSourcePageEvent {\n  pageIndex: number;\n  pageSize: number;\n  length: number;\n}\n\n/**\n * Interface that matches the required API parts of the MatPaginator.\n * Decoupled so that users can depend on either the legacy or MDC-based paginator.\n */\nexport interface MatTableDataSourcePaginator {\n  page: Subject<MatTableDataSourcePageEvent>;\n  pageIndex: number;\n  initialized: Observable<void>;\n  pageSize: number;\n  length: number;\n}\n\n/** Shared base class with MDC-based implementation. */\nexport class _MatTableDataSource<T,\n    P extends MatTableDataSourcePaginator = MatTableDataSourcePaginator>\n    extends DataSource<T> {\n  /** Stream that emits when a new data array is set on the data source. */\n  private readonly _data: BehaviorSubject<T[]>;\n\n  /** Stream emitting render data to the table (depends on ordered data changes). */\n  private readonly _renderData = new BehaviorSubject<T[]>([]);\n\n  /** Stream that emits when a new filter string is set on the data source. */\n  private readonly _filter = new BehaviorSubject<string>('');\n\n  /** Used to react to internal changes of the paginator that are made by the data source itself. */\n  private readonly _internalPageChanges = new Subject<void>();\n\n  /**\n   * Subscription to the changes that should trigger an update to the table's rendered rows, such\n   * as filtering, sorting, pagination, or base data changes.\n   */\n  _renderChangesSubscription: Subscription|null = null;\n\n  /**\n   * The filtered set of data that has been matched by the filter string, or all the data if there\n   * is no filter. Useful for knowing the set of data the table represents.\n   * For example, a 'selectAll()' function would likely want to select the set of filtered data\n   * shown to the user rather than all the data.\n   */\n  filteredData: T[];\n\n  /** Array of data that should be rendered by the table, where each object represents one row. */\n  get data() { return this._data.value; }\n  set data(data: T[]) {\n    this._data.next(data);\n    // Normally the `filteredData` is updated by the re-render\n    // subscription, but that won't happen if it's inactive.\n    if (!this._renderChangesSubscription) {\n      this._filterData(data);\n    }\n  }\n\n  /**\n   * Filter term that should be used to filter out objects from the data array. To override how\n   * data objects match to this filter string, provide a custom function for filterPredicate.\n   */\n  get filter(): string { return this._filter.value; }\n  set filter(filter: string) {\n    this._filter.next(filter);\n    // Normally the `filteredData` is updated by the re-render\n    // subscription, but that won't happen if it's inactive.\n    if (!this._renderChangesSubscription) {\n      this._filterData(this.data);\n    }\n  }\n\n  /**\n   * Instance of the MatSort directive used by the table to control its sorting. Sort changes\n   * emitted by the MatSort will trigger an update to the table's rendered data.\n   */\n  get sort(): MatSort | null { return this._sort; }\n  set sort(sort: MatSort|null) {\n    this._sort = sort;\n    this._updateChangeSubscription();\n  }\n  private _sort: MatSort|null;\n\n  /**\n   * Instance of the MatPaginator component used by the table to control what page of the data is\n   * displayed. Page changes emitted by the MatPaginator will trigger an update to the\n   * table's rendered data.\n   *\n   * Note that the data source uses the paginator's properties to calculate which page of data\n   * should be displayed. If the paginator receives its properties as template inputs,\n   * e.g. `[pageLength]=100` or `[pageIndex]=1`, then be sure that the paginator's view has been\n   * initialized before assigning it to this data source.\n   */\n  get paginator(): P | null { return this._paginator; }\n  set paginator(paginator: P | null) {\n    this._paginator = paginator;\n    this._updateChangeSubscription();\n  }\n  private _paginator: P | null;\n\n  /**\n   * Data accessor function that is used for accessing data properties for sorting through\n   * the default sortData function.\n   * This default function assumes that the sort header IDs (which defaults to the column name)\n   * matches the data's properties (e.g. column Xyz represents data['Xyz']).\n   * May be set to a custom function for different behavior.\n   * @param data Data object that is being accessed.\n   * @param sortHeaderId The name of the column that represents the data.\n   */\n  sortingDataAccessor: ((data: T, sortHeaderId: string) => string|number) =\n      (data: T, sortHeaderId: string): string|number => {\n    const value = (data as {[key: string]: any})[sortHeaderId];\n\n    if (_isNumberValue(value)) {\n      const numberValue = Number(value);\n\n      // Numbers beyond `MAX_SAFE_INTEGER` can't be compared reliably so we\n      // leave them as strings. For more info: https://goo.gl/y5vbSg\n      return numberValue < MAX_SAFE_INTEGER ? numberValue : value;\n    }\n\n    return value;\n  }\n\n  /**\n   * Gets a sorted copy of the data array based on the state of the MatSort. Called\n   * after changes are made to the filtered data or when sort changes are emitted from MatSort.\n   * By default, the function retrieves the active sort and its direction and compares data\n   * by retrieving data using the sortingDataAccessor. May be overridden for a custom implementation\n   * of data ordering.\n   * @param data The array of data that should be sorted.\n   * @param sort The connected MatSort that holds the current sort state.\n   */\n  sortData: ((data: T[], sort: MatSort) => T[]) = (data: T[], sort: MatSort): T[] => {\n    const active = sort.active;\n    const direction = sort.direction;\n    if (!active || direction == '') { return data; }\n\n    return data.sort((a, b) => {\n      let valueA = this.sortingDataAccessor(a, active);\n      let valueB = this.sortingDataAccessor(b, active);\n\n      // If there are data in the column that can be converted to a number,\n      // it must be ensured that the rest of the data\n      // is of the same type so as not to order incorrectly.\n      const valueAType = typeof valueA;\n      const valueBType = typeof valueB;\n\n      if (valueAType !== valueBType) {\n        if (valueAType === 'number') { valueA += ''; }\n        if (valueBType === 'number') { valueB += ''; }\n      }\n\n      // If both valueA and valueB exist (truthy), then compare the two. Otherwise, check if\n      // one value exists while the other doesn't. In this case, existing value should come last.\n      // This avoids inconsistent results when comparing values to undefined/null.\n      // If neither value exists, return 0 (equal).\n      let comparatorResult = 0;\n      if (valueA != null && valueB != null) {\n        // Check if one value is greater than the other; if equal, comparatorResult should remain 0.\n        if (valueA > valueB) {\n          comparatorResult = 1;\n        } else if (valueA < valueB) {\n          comparatorResult = -1;\n        }\n      } else if (valueA != null) {\n        comparatorResult = 1;\n      } else if (valueB != null) {\n        comparatorResult = -1;\n      }\n\n      return comparatorResult * (direction == 'asc' ? 1 : -1);\n    });\n  }\n\n  /**\n   * Checks if a data object matches the data source's filter string. 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May be overridden for a custom implementation of\n   * filter matching.\n   * @param data Data object used to check against the filter.\n   * @param filter Filter string that has been set on the data source.\n   * @returns Whether the filter matches against the data\n   */\n  filterPredicate: ((data: T, filter: string) => boolean) = (data: T, filter: string): boolean => {\n    // Transform the data into a lowercase string of all property values.\n    const dataStr = Object.keys(data).reduce((currentTerm: string, key: string) => {\n      // Use an obscure Unicode character to delimit the words in the concatenated string.\n      // This avoids matches where the values of two columns combined will match the user's query\n      // (e.g. `Flute` and `Stop` will match `Test`). The character is intended to be something\n      // that has a very low chance of being typed in by somebody in a text field. This one in\n      // particular is \"White up-pointing triangle with dot\" from\n      // https://en.wikipedia.org/wiki/List_of_Unicode_characters\n      return currentTerm + (data as {[key: string]: any})[key] + '◬';\n    }, '').toLowerCase();\n\n    // Transform the filter by converting it to lowercase and removing whitespace.\n    const transformedFilter = filter.trim().toLowerCase();\n\n    return dataStr.indexOf(transformedFilter) != -1;\n  }\n\n  constructor(initialData: T[] = []) {\n    super();\n    this._data = new BehaviorSubject<T[]>(initialData);\n    this._updateChangeSubscription();\n  }\n\n  /**\n   * Subscribe to changes that should trigger an update to the table's rendered rows. When the\n   * changes occur, process the current state of the filter, sort, and pagination along with\n   * the provided base data and send it to the table for rendering.\n   */\n  _updateChangeSubscription() {\n    // Sorting and/or pagination should be watched if MatSort and/or MatPaginator are provided.\n    // The events should emit whenever the component emits a change or initializes, or if no\n    // component is provided, a stream with just a null event should be provided.\n    // The `sortChange` and `pageChange` acts as a signal to the combineLatests below so that the\n    // pipeline can progress to the next step. Note that the value from these streams are not used,\n    // they purely act as a signal to progress in the pipeline.\n    const sortChange: Observable<Sort|null|void> = this._sort ?\n        merge(this._sort.sortChange, this._sort.initialized) as Observable<Sort|void> :\n        observableOf(null);\n    const pageChange: Observable<MatTableDataSourcePageEvent|null|void> = this._paginator ?\n        merge(\n          this._paginator.page,\n          this._internalPageChanges,\n          this._paginator.initialized\n        ) as Observable<MatTableDataSourcePageEvent|void> :\n        observableOf(null);\n    const dataStream = this._data;\n    // Watch for base data or filter changes to provide a filtered set of data.\n    const filteredData = combineLatest([dataStream, this._filter])\n      .pipe(map(([data]) => this._filterData(data)));\n    // Watch for filtered data or sort changes to provide an ordered set of data.\n    const orderedData = combineLatest([filteredData, sortChange])\n      .pipe(map(([data]) => this._orderData(data)));\n    // Watch for ordered data or page changes to provide a paged set of data.\n    const paginatedData = combineLatest([orderedData, pageChange])\n      .pipe(map(([data]) => this._pageData(data)));\n    // Watched for paged data changes and send the result to the table to render.\n    this._renderChangesSubscription?.unsubscribe();\n    this._renderChangesSubscription = paginatedData.subscribe(data => this._renderData.next(data));\n  }\n\n  /**\n   * Returns a filtered data array where each filter object contains the filter string within\n   * the result of the filterTermAccessor function. If no filter is set, returns the data array\n   * as provided.\n   */\n  _filterData(data: T[]) {\n    // If there is a filter string, filter out data that does not contain it.\n    // Each data object is converted to a string using the function defined by filterTermAccessor.\n    // May be overridden for customization.\n    this.filteredData = (this.filter == null || this.filter === '') ? data :\n        data.filter(obj => this.filterPredicate(obj, this.filter));\n\n    if (this.paginator) { this._updatePaginator(this.filteredData.length); }\n\n    return this.filteredData;\n  }\n\n  /**\n   * Returns a sorted copy of the data if MatSort has a sort applied, otherwise just returns the\n   * data array as provided. Uses the default data accessor for data lookup, unless a\n   * sortDataAccessor function is defined.\n   */\n  _orderData(data: T[]): T[] {\n    // If there is no active sort or direction, return the data without trying to sort.\n    if (!this.sort) { return data; }\n\n    return this.sortData(data.slice(), this.sort);\n  }\n\n  /**\n   * Returns a paged slice of the provided data array according to the provided MatPaginator's page\n   * index and length. If there is no paginator provided, returns the data array as provided.\n   */\n  _pageData(data: T[]): T[] {\n    if (!this.paginator) { return data; }\n\n    const startIndex = this.paginator.pageIndex * this.paginator.pageSize;\n    return data.slice(startIndex, startIndex + this.paginator.pageSize);\n  }\n\n  /**\n   * Updates the paginator to reflect the length of the filtered data, and makes sure that the page\n   * index does not exceed the paginator's last page. Values are changed in a resolved promise to\n   * guard against making property changes within a round of change detection.\n   */\n  _updatePaginator(filteredDataLength: number) {\n    Promise.resolve().then(() => {\n      const paginator = this.paginator;\n\n      if (!paginator) { return; }\n\n      paginator.length = filteredDataLength;\n\n      // If the page index is set beyond the page, reduce it to the last page.\n      if (paginator.pageIndex > 0) {\n        const lastPageIndex = Math.ceil(paginator.length / paginator.pageSize) - 1 || 0;\n        const newPageIndex = Math.min(paginator.pageIndex, lastPageIndex);\n\n        if (newPageIndex !== paginator.pageIndex) {\n          paginator.pageIndex = newPageIndex;\n\n          // Since the paginator only emits after user-generated changes,\n          // we need our own stream so we know to should re-render the data.\n          this._internalPageChanges.next();\n        }\n      }\n    });\n  }\n\n  /**\n   * Used by the MatTable. Called when it connects to the data source.\n   * @docs-private\n   */\n  connect() {\n    if (!this._renderChangesSubscription) {\n      this._updateChangeSubscription();\n    }\n\n    return this._renderData;\n  }\n\n  /**\n   * Used by the MatTable. Called when it disconnects from the data source.\n   * @docs-private\n   */\n  disconnect() {\n    this._renderChangesSubscription?.unsubscribe();\n    this._renderChangesSubscription = null;\n  }\n}\n\n/**\n * Data source that accepts a client-side data array and includes native support of filtering,\n * sorting (using MatSort), and pagination (using MatPaginator).\n *\n * Allows for sort customization by overriding sortingDataAccessor, which defines how data\n * properties are accessed. Also allows for filter customization by overriding filterTermAccessor,\n * which defines how row data is converted to a string for filter matching.\n *\n * **Note:** This class is meant to be a simple data source to help you get started. As such\n * it isn't equipped to handle some more advanced cases like robust i18n support or server-side\n * interactions. If your app needs to support more advanced use cases, consider implementing your\n * own `DataSource`.\n */\nexport class MatTableDataSource<T> extends _MatTableDataSource<T, MatPaginator> {}\n"]}