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diff --git a/packages/frontend/src/components/grid/grid-event.ts b/packages/frontend/src/components/grid/grid-event.ts
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+++ b/packages/frontend/src/components/grid/grid-event.ts
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+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { CellAddress, CellValue, GridCell } from '@/components/grid/cell.js';
+import { GridState } from '@/components/grid/grid.js';
+import { ValidateViolation } from '@/components/grid/cell-validators.js';
+import { GridColumn } from '@/components/grid/column.js';
+import { GridRow } from '@/components/grid/row.js';
+
+export type GridContext = {
+	selectedCell?: GridCell;
+	rangedCells: GridCell[];
+	rangedRows: GridRow[];
+	randedBounds: {
+		leftTop: CellAddress;
+		rightBottom: CellAddress;
+	};
+	availableBounds: {
+		leftTop: CellAddress;
+		rightBottom: CellAddress;
+	};
+	state: GridState;
+	rows: GridRow[];
+	columns: GridColumn[];
+};
+
+export type GridEvent =
+	GridCellValueChangeEvent |
+	GridCellValidationEvent
+	;
+
+export type GridCellValueChangeEvent = {
+	type: 'cell-value-change';
+	column: GridColumn;
+	row: GridRow;
+	oldValue: CellValue;
+	newValue: CellValue;
+};
+
+export type GridCellValidationEvent = {
+	type: 'cell-validation';
+	violation?: ValidateViolation;
+	all: ValidateViolation[];
+};