/
transformer.test.ts
115 lines (98 loc) · 2.72 KB
/
transformer.test.ts
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import * as z from '..';
import { util } from '../helpers/util';
const stringToNumber = z.string().transform(z.number(), arg => parseFloat(arg));
const numberToString = z.transformer(z.number(), z.string(), n => String(n));
const asyncNumberToString = z.transformer(z.number(), z.string(), async n =>
String(n),
);
test('basic transformations', () => {
const r1 = z
.transformer(z.string(), z.number(), data => data.length)
.parse('asdf');
expect(r1).toEqual(4);
});
test('coercion', () => {
const numToString = z.transformer(z.number(), z.string(), n => String(n));
const data = z
.object({
id: numToString,
})
.parse({ id: 5 });
expect(data).toEqual({ id: '5' });
});
test('async coercion', async () => {
const numToString = z.transformer(z.number(), z.string(), async n =>
String(n),
);
const data = await z
.object({
id: numToString,
})
.parseAsync({ id: 5 });
expect(data).toEqual({ id: '5' });
return 'asdf';
});
test('sync coercion async error', async () => {
expect(() =>
z
.object({
id: asyncNumberToString,
})
.parse({ id: 5 }),
).toThrow();
return 'asdf';
// expect(data).toEqual({ id: '5' });
});
test('default', () => {
const data = z
.string()
.default('asdf')
.parse(undefined); // => "asdf"
expect(data).toEqual('asdf');
});
test('default when property is null or undefined', () => {
const data = z
.object({
foo: z
.boolean()
.nullable()
.default(true),
bar: z.boolean().default(true),
})
.parse({ foo: null });
expect(data).toEqual({ foo: null, bar: true });
});
test('default with falsy values', () => {
const schema = z.object({
emptyStr: z.string().default('def'),
zero: z.number().default(5),
falseBoolean: z.boolean().default(true),
});
const input = { emptyStr: '', zero: 0, falseBoolean: true };
const output = schema.parse(input);
// defaults are not supposed to be used
expect(output).toEqual(input);
});
test('object typing', () => {
const t1 = z.object({
stringToNumber,
});
type t1 = z.input<typeof t1>;
type t2 = z.output<typeof t1>;
const f1: util.AssertEqual<t1, { stringToNumber: string }> = true;
const f2: util.AssertEqual<t2, { stringToNumber: number }> = true;
f1;
f2;
});
test('transform method overloads', () => {
const t1 = z.string().transform(val => val.toUpperCase());
expect(t1.parse('asdf')).toEqual('ASDF');
const t2 = z.string().transform(z.number(), val => val.length);
expect(t2.parse('asdf')).toEqual(4);
});
test('multiple transformers', () => {
const doubler = z.transformer(stringToNumber, numberToString, val => {
return val * 2;
});
expect(doubler.parse('5')).toEqual('10');
});