diff --git a/styles/src/themeConfig.ts b/styles/src/themeConfig.ts
new file mode 100644
index 0000000000000000000000000000000000000000..0b93a678533f7756e2d0d5fc6b105ab38a702003
--- /dev/null
+++ b/styles/src/themeConfig.ts
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+import { Scale, Color } from "chroma-js"
+import { Syntax } from "./themes/common/syntax"
+
+interface ThemeMeta {
+    /** The name of the theme */
+    name: string
+    /** The theme's appearance. Either `light` or `dark`. */
+    appearance: ThemeAppearance
+    /** The author of the theme
+     *
+     * Ideally formatted as `Full Name <email>`
+     *
+     * Example: `John Doe <john@doe.com>`
+     */
+    author: string
+    /** SPDX License string
+     *
+     * Example: `MIT`
+     */
+    licenseType?: string
+    licenseUrl?: string
+    themeUrl?: string
+}
+
+export interface ThemeConfigInputColors {
+    neutral: Scale<Color>
+    red: Scale<Color>
+    orange: Scale<Color>
+    yellow: Scale<Color>
+    green: Scale<Color>
+    cyan: Scale<Color>
+    blue: Scale<Color>
+    violet: Scale<Color>
+    magenta: Scale<Color>
+}
+
+export type ThemeConfigInputColorsKeys = keyof ThemeConfigInputColors
+
+/** Allow any part of a syntax highlight style to be overriden by the theme
+ *
+ * Example:
+ * ```ts
+ * override: {
+ *   syntax: {
+ *     boolean: {
+ *       underline: true,
+ *     },
+ *   },
+ * }
+ * ```
+ */
+export type ThemeConfigInputSyntax = Partial<Syntax>
+
+interface ThemeConfigOverrides {
+    syntax: ThemeConfigInputSyntax
+}
+
+type ThemeConfigProperties = ThemeMeta & {
+    inputColor: ThemeConfigInputColors
+    override: ThemeConfigOverrides
+}
+
+// This should be the format a theme is defined as
+export type ThemeConfig = {
+    [K in keyof ThemeConfigProperties]: ThemeConfigProperties[K]
+}
+
+interface ThemeColors {
+    neutral: string[]
+    red: string[]
+    orange: string[]
+    yellow: string[]
+    green: string[]
+    cyan: string[]
+    blue: string[]
+    violet: string[]
+    magenta: string[]
+}
+
+type ThemeSyntax = Required<Syntax>
+
+export type ThemeProperties = ThemeMeta & {
+    color: ThemeColors
+    syntax: ThemeSyntax
+}
+
+// This should be a theme after all its properties have been resolved
+export type Theme = {
+    [K in keyof ThemeProperties]: ThemeProperties[K]
+}
+
+export enum ThemeAppearance {
+    Light = "light",
+    Dark = "dark",
+}
+
+export type ThemeFamilyItem =
+    | ThemeConfig
+    | { light: ThemeConfig; dark: ThemeConfig }
+
+type ThemeFamilyProperties = Partial<Omit<ThemeMeta, "name" | "appearance">> & {
+    name: string
+    default: ThemeFamilyItem
+    variants: {
+        [key: string]: ThemeFamilyItem
+    }
+}
+
+// Idea: A theme family is a collection of themes that share the same name
+// For example, a theme family could be `One Dark` and have a `light` and `dark` variant
+// The Ayu family could have `light`, `mirage`, and `dark` variants
+
+type ThemeFamily = {
+    [K in keyof ThemeFamilyProperties]: ThemeFamilyProperties[K]
+}
+
+/** The collection of all themes
+ *
+ * Example:
+ * ```ts
+ * {
+ *   one_dark,
+ *   one_light,
+ *     ayu: {
+ *     name: 'Ayu',
+ *     default: 'ayu_mirage',
+ *     variants: {
+ *       light: 'ayu_light',
+ *       mirage: 'ayu_mirage',
+ *       dark: 'ayu_dark',
+ *     },
+ *   },
+ *  ...
+ * }
+ * ```
+ */
+export type ThemeIndex = Record<string, ThemeFamily | ThemeConfig>