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The `enum` is a popular aspect of TypeScript, and can be embedded in
interfaces as a concise, but descriptive, shorthand for literal string
unions:
```typescript
enum Colour {
White = '000000',
Black = 'ffffff'
}
```
This change adds an exported member `enum` to `io-ts`, based on
[this suggestion][1] by @noe132
It means that `enum`s can be reused directly in `io-ts`:
```typescript
const T = t.enum(Colour)
```
[1]: #216 (comment)- Loading branch information
Alec Gibson
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Jan 4, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| import * as assert from 'assert' | ||
| import * as t from '../src/index' | ||
| import * as _ from '../src/Decoder' | ||
| import { isLeft } from 'fp-ts/lib/Either' | ||
|
|
||
| describe('enum', () => { | ||
| enum A { | ||
| Foo = 'foo', | ||
| Bar = 'bar' | ||
| } | ||
|
|
||
| enum B { | ||
| Foo, | ||
| Bar | ||
| } | ||
|
|
||
| describe('name', () => { | ||
| it('should assign a default name', () => { | ||
| const T = t.enum(A) | ||
| assert.strictEqual(T.name, 'enum') | ||
| }) | ||
|
|
||
| it('should accept a name', () => { | ||
| const T = t.enum(A, 'T') | ||
| assert.strictEqual(T.name, 'T') | ||
| }) | ||
| }) | ||
|
|
||
| describe('is', () => { | ||
| it('should check an enum string value', () => { | ||
| const T = t.enum(A) | ||
| assert.strictEqual(T.is(A.Foo), true) | ||
| assert.strictEqual(T.is('bar'), true) | ||
| assert.strictEqual(T.is('invalid'), false) | ||
| assert.strictEqual(T.is(null), false) | ||
| assert.strictEqual(T.is(A), false) | ||
| }) | ||
|
|
||
| it('should check an enum integer value', () => { | ||
| const T = t.enum(B) | ||
| assert.strictEqual(T.is(B.Foo), true) | ||
| assert.strictEqual(T.is(1), true) | ||
| assert.strictEqual(T.is('Foo'), false) | ||
| assert.strictEqual(T.is('invalid'), false) | ||
| assert.strictEqual(T.is(null), false) | ||
| assert.strictEqual(T.is(B), false) | ||
| }) | ||
| }) | ||
|
|
||
| describe('decode', () => { | ||
| it('should decode an enum string value', () => { | ||
| const T = t.enum(A) | ||
| assert.deepStrictEqual(T.decode(A.Foo), _.success(A.Foo)) | ||
| assert.deepStrictEqual(T.decode('bar'), _.success('bar')) | ||
| }) | ||
|
|
||
| it('should decode an enum integer value', () => { | ||
| const T = t.enum(B) | ||
| assert.deepStrictEqual(T.decode(B.Foo), _.success(B.Foo)) | ||
| assert.deepStrictEqual(T.decode(1), _.success(1)) | ||
| }) | ||
|
|
||
| it('should fail decoding an invalid string value', () => { | ||
| const T = t.enum(A) | ||
| assert.deepStrictEqual(isLeft(T.decode('invalid')), true) | ||
| }) | ||
|
|
||
| it('should fail decoding an invalid integer value', () => { | ||
| const T = t.enum(B) | ||
| assert.deepStrictEqual(isLeft(T.decode(2)), true) | ||
| }) | ||
| }) | ||
|
|
||
| describe('encode', () => { | ||
| it('should encode an enum string value', () => { | ||
| const T = t.enum(A) | ||
| assert.deepStrictEqual(T.encode(A.Foo), A.Foo) | ||
| }) | ||
|
|
||
| it('should encode an enum integer value', () => { | ||
| const T = t.enum(B) | ||
| assert.deepStrictEqual(T.encode(B.Foo), B.Foo) | ||
| }) | ||
| }) | ||
| }) |