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diff --git a/devtools/client/inspector/fonts/types.js b/devtools/client/inspector/fonts/types.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const PropTypes = require("resource://devtools/client/shared/vendor/react-prop-types.js");
+
+/**
+ * A font variation axis.
+ */
+const fontVariationAxis = (exports.fontVariationAxis = {
+  // The OpenType tag name of the variation axis
+  tag: PropTypes.string,
+
+  // The axis name of the variation axis
+  name: PropTypes.string,
+
+  // The minimum value of the variation axis
+  minValue: PropTypes.number,
+
+  // The maximum value of the variation axis
+  maxValue: PropTypes.number,
+
+  // The default value of the variation axis
+  defaultValue: PropTypes.number,
+});
+
+const fontVariationInstanceValue = (exports.fontVariationInstanceValue = {
+  // The axis name of the variation axis
+  axis: PropTypes.string,
+
+  // The value of the variation axis
+  value: PropTypes.number,
+});
+
+/**
+ * A font variation instance.
+ */
+const fontVariationInstance = (exports.fontVariationInstance = {
+  // The variation instance name of the font
+  name: PropTypes.string,
+
+  // The font variation values for the variation instance of the font
+  values: PropTypes.arrayOf(PropTypes.shape(fontVariationInstanceValue)),
+});
+
+/**
+ * A single font.
+ */
+const font = (exports.font = {
+  // Font family name
+  CSSFamilyName: PropTypes.string,
+
+  // The format of the font
+  format: PropTypes.string,
+
+  // The name of the font
+  name: PropTypes.string,
+
+  // URL for the font preview
+  previewUrl: PropTypes.string,
+
+  // Object containing the CSS rule for the font
+  rule: PropTypes.object,
+
+  // The text of the CSS rule
+  ruleText: PropTypes.string,
+
+  // The URI of the font file
+  URI: PropTypes.string,
+
+  // The variation axes of the font
+  variationAxes: PropTypes.arrayOf(PropTypes.shape(fontVariationAxis)),
+
+  // The variation instances of the font
+  variationInstances: PropTypes.arrayOf(PropTypes.shape(fontVariationInstance)),
+});
+
+exports.fontOptions = {
+  // The current preview text
+  previewText: PropTypes.string,
+};
+
+exports.fontEditor = {
+  // Variable font axes and their values
+  axes: PropTypes.object,
+
+  // Axes values changed at runtime structured like the "values" property
+  // of a fontVariationInstance
+  customInstanceValues: PropTypes.array,
+
+  // Fonts used on the selected element
+  fonts: PropTypes.arrayOf(PropTypes.shape(font)),
+
+  // Font variation instance currently selected
+  instance: PropTypes.shape(fontVariationInstance),
+
+  // CSS font properties defined on the element
+  properties: PropTypes.object,
+};
+
+/**
+ * Font data.
+ */
+exports.fontData = {
+  // All fonts on the current page.
+  allFonts: PropTypes.arrayOf(PropTypes.shape(font)),
+};