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diff --git a/pw_web/log-viewer/src/shared/interfaces.ts b/pw_web/log-viewer/src/shared/interfaces.ts
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+++ b/pw_web/log-viewer/src/shared/interfaces.ts
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+// Copyright 2023 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+export interface FieldData {
+  key: string;
+  value: string | boolean | number | object;
+}
+
+export interface TableColumn {
+  fieldName: string;
+  characterLength: number;
+  manualWidth: number | null;
+  isVisible: boolean;
+}
+
+export interface LogEntry {
+  severity?: Severity;
+  timestamp: Date;
+  fields: FieldData[];
+}
+
+export interface LogViewConfig {
+  columnData: TableColumn[];
+  search: string;
+  viewID: string;
+  viewTitle: string;
+}
+
+export enum Severity {
+  DEBUG = 'DEBUG',
+  INFO = 'INFO',
+  WARNING = 'WARNING',
+  ERROR = 'ERROR',
+  CRITICAL = 'CRITICAL',
+}
+
+export interface State {
+  logViewConfig: LogViewConfig[];
+}