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public-types.test.ts
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public-types.test.ts
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import { describe, test } from '@jest/globals';
import type { ComponentAnnotations, StoryAnnotations } from '@storybook/types';
import { expectTypeOf } from 'expect-type';
import type { ComponentProps, SvelteComponentTyped } from 'svelte';
import Button from './__test__/Button.svelte';
import Decorator from './__test__/Decorator.svelte';
import Decorator2 from './__test__/Decorator2.svelte';
import type { DecoratorFn, Meta, StoryObj } from './public-types';
import type { SvelteFramework } from './types';
type SvelteStory<Component extends SvelteComponentTyped, Args, RequiredArgs> = StoryAnnotations<
SvelteFramework<Component>,
Args,
RequiredArgs
>;
describe('Meta', () => {
test('Generic parameter of Meta can be a component', () => {
const meta: Meta<Button> = {
component: Button,
args: {
label: 'good',
disabled: false,
},
};
expectTypeOf(meta).toEqualTypeOf<
ComponentAnnotations<SvelteFramework<Button>, { disabled: boolean; label: string }>
>();
});
test('Generic parameter of Meta can be the props of the component', () => {
const meta: Meta<{ disabled: boolean; label: string }> = {
component: Button,
args: { label: 'good', disabled: false },
};
expectTypeOf(meta).toEqualTypeOf<
ComponentAnnotations<SvelteFramework, { disabled: boolean; label: string }>
>();
});
test('Events are inferred from component', () => {
({
component: Button,
args: {
label: 'good',
disabled: false,
},
render: (args) => ({
Component: Button,
props: args,
on: {
mousemove: (event) => {
expectTypeOf(event).toEqualTypeOf<MouseEvent>();
},
},
}),
}) satisfies Meta<Button>;
});
test('Events fallback to custom events when no component is specified', () => {
({
component: Button,
args: { label: 'good', disabled: false },
render: (args) => ({
Component: Button,
props: args,
on: {
mousemove: (event) => {
expectTypeOf(event).toEqualTypeOf<CustomEvent>();
},
},
}),
}) satisfies Meta<{ disabled: boolean; label: string }>;
});
});
describe('StoryObj', () => {
test('✅ Required args may be provided partial in meta and the story', () => {
const meta = {
component: Button,
args: { label: 'good' },
} satisfies Meta<Button>;
type Actual = StoryObj<typeof meta>;
type Expected = SvelteStory<
Button,
{ disabled: boolean; label: string },
{ disabled: boolean; label?: string }
>;
expectTypeOf<Actual>().toEqualTypeOf<Expected>();
});
test('❌ The combined shape of meta args and story args must match the required args.', () => {
{
const meta = { component: Button } satisfies Meta<Button>;
type Expected = SvelteStory<
Button,
{ disabled: boolean; label: string },
{ disabled: boolean; label: string }
>;
expectTypeOf<StoryObj<typeof meta>>().toEqualTypeOf<Expected>();
}
{
const meta = {
component: Button,
args: { label: 'good' },
} satisfies Meta<Button>;
// @ts-expect-error disabled not provided ❌
const Basic: StoryObj<typeof meta> = {};
type Expected = SvelteStory<
Button,
{ disabled: boolean; label: string },
{ disabled: boolean; label?: string }
>;
expectTypeOf(Basic).toEqualTypeOf<Expected>();
}
{
const meta = { component: Button } satisfies Meta<{ label: string; disabled: boolean }>;
const Basic: StoryObj<typeof meta> = {
// @ts-expect-error disabled not provided ❌
args: { label: 'good' },
};
type Expected = SvelteStory<
Button,
{ disabled: boolean; label: string },
{ disabled: boolean; label: string }
>;
expectTypeOf(Basic).toEqualTypeOf<Expected>();
}
});
test('Component can be used as generic parameter for StoryObj', () => {
expectTypeOf<StoryObj<Button>>().toEqualTypeOf<
SvelteStory<
Button,
{ disabled: boolean; label: string },
{ disabled?: boolean; label?: string }
>
>();
});
});
type ThemeData = 'light' | 'dark';
describe('Story args can be inferred', () => {
test('Correct args are inferred when type is widened for render function', () => {
const meta = {
component: Button,
args: { disabled: false },
render: (args, { component }) => {
return {
Component: component,
props: args,
};
},
} satisfies Meta<ComponentProps<Button> & { theme: ThemeData }>;
const Basic: StoryObj<typeof meta> = { args: { theme: 'light', label: 'good' } };
type Expected = SvelteStory<
Button,
{ theme: ThemeData; disabled: boolean; label: string },
{ theme: ThemeData; disabled?: boolean; label: string }
>;
expectTypeOf(Basic).toEqualTypeOf<Expected>();
});
const withDecorator: DecoratorFn<{ decoratorArg: string }> = (
storyFn,
{ args: { decoratorArg } }
) => ({
Component: Decorator,
props: { decoratorArg },
});
test('Correct args are inferred when type is widened for decorators', () => {
type Props = ComponentProps<Button> & { decoratorArg: string };
const meta = {
component: Button,
args: { disabled: false },
decorators: [withDecorator],
} satisfies Meta<Props>;
const Basic: StoryObj<typeof meta> = { args: { decoratorArg: 'title', label: 'good' } };
type Expected = SvelteStory<
Button,
Props,
{ decoratorArg: string; disabled?: boolean; label: string }
>;
expectTypeOf(Basic).toEqualTypeOf<Expected>();
});
test('Correct args are inferred when type is widened for multiple decorators', () => {
type Props = ComponentProps<Button> & { decoratorArg: string; decoratorArg2: string };
const secondDecorator: DecoratorFn<{ decoratorArg2: string }> = (
storyFn,
{ args: { decoratorArg2 } }
) => ({
Component: Decorator2,
props: { decoratorArg2 },
});
const meta = {
component: Button,
args: { disabled: false },
decorators: [withDecorator, secondDecorator],
} satisfies Meta<Props>;
const Basic: StoryObj<typeof meta> = {
args: { decoratorArg: '', decoratorArg2: '', label: 'good' },
};
type Expected = SvelteStory<
Button,
Props,
{ decoratorArg: string; decoratorArg2: string; disabled?: boolean; label: string }
>;
expectTypeOf(Basic).toEqualTypeOf<Expected>();
});
});