1 files changed, 104 insertions, 0 deletions
diff --git a/packages/frontend/src/utility/form.ts b/packages/frontend/src/utility/form.ts
new file mode 100644
index 0000000000..1032e97ac9
--- /dev/null
+++ b/packages/frontend/src/utility/form.ts
@@ -0,0 +1,104 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as Misskey from 'misskey-js';
+
+type EnumItem = string | {
+	label: string;
+	value: string;
+};
+
+type Hidden = boolean | ((v: any) => boolean);
+
+export type FormItem = {
+	label?: string;
+	type: 'string';
+	default?: string | null;
+	description?: string;
+	required?: boolean;
+	hidden?: Hidden;
+	multiline?: boolean;
+	treatAsMfm?: boolean;
+} | {
+	label?: string;
+	type: 'number';
+	default?: number | null;
+	description?: string;
+	required?: boolean;
+	hidden?: Hidden;
+	step?: number;
+} | {
+	label?: string;
+	type: 'boolean';
+	default?: boolean | null;
+	description?: string;
+	hidden?: Hidden;
+} | {
+	label?: string;
+	type: 'enum';
+	default?: string | null;
+	required?: boolean;
+	hidden?: Hidden;
+	enum: EnumItem[];
+} | {
+	label?: string;
+	type: 'radio';
+	default?: unknown | null;
+	required?: boolean;
+	hidden?: Hidden;
+	options: {
+		label: string;
+		value: unknown;
+	}[];
+} | {
+	label?: string;
+	type: 'range';
+	default?: number | null;
+	description?: string;
+	required?: boolean;
+	step?: number;
+	min: number;
+	max: number;
+	textConverter?: (value: number) => string;
+	hidden?: Hidden;
+} | {
+	label?: string;
+	type: 'object';
+	default?: Record<string, unknown> | null;
+	hidden: Hidden;
+} | {
+	label?: string;
+	type: 'array';
+	default?: unknown[] | null;
+	hidden: Hidden;
+} | {
+	type: 'button';
+	content?: string;
+	hidden?: Hidden;
+	action: (ev: MouseEvent, v: any) => void;
+} | {
+	type: 'drive-file';
+	defaultFileId?: string | null;
+	hidden?: Hidden;
+	validate?: (v: Misskey.entities.DriveFile) => Promise<boolean>;
+};
+
+export type Form = Record<string, FormItem>;
+
+type GetItemType<Item extends FormItem> =
+	Item['type'] extends 'string' ? string :
+	Item['type'] extends 'number' ? number :
+	Item['type'] extends 'boolean' ? boolean :
+	Item['type'] extends 'radio' ? unknown :
+	Item['type'] extends 'range' ? number :
+	Item['type'] extends 'enum' ? string :
+	Item['type'] extends 'array' ? unknown[] :
+	Item['type'] extends 'object' ? Record<string, unknown> :
+	Item['type'] extends 'drive-file' ? Misskey.entities.DriveFile | undefined :
+	never;
+
+export type GetFormResultType<F extends Form> = {
+	[P in keyof F]: GetItemType<F[P]>;
+};