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chainable options

介绍​

实现一个可串联的构造器,你可以使用任意你喜欢的方式实现这个类型 - Interface, Type 或 Class 都行。你需要提供两个函数 option(key, value) 和 get()。在 option 中你需要使用提供的 key 和 value 扩展当前的对象类型，通过 get 获取最终结果。

For example

ts
  declare const config: Chainable
  const result = config
    .option('foo', 123)
    .option('name', 'type-challenges')
    .option('bar', { value: 'Hello World' })
    .get()
  // 期望 result 的类型是：
  interface Result {
    foo: number
    name: string
    bar: {
      value: string
    }
  }
ts
  declare const config: Chainable
  const result = config
    .option('foo', 123)
    .option('name', 'type-challenges')
    .option('bar', { value: 'Hello World' })
    .get()
  // 期望 result 的类型是：
  interface Result {
    foo: number
    name: string
    bar: {
      value: string
    }
  }
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起点​

ts
/* _____________ Your Code Here _____________ */
 
// type Chainable = {
//   option(key: string, value: any): any
//   get(): any
// }
 
type Chainable = any
 
/* _____________ Test Cases _____________ */
type cases = [
  Expect<Alike<typeof result1, Expected1>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Alike<typeof result2, Expected2>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Alike<typeof result3, Expected3>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
]
 
 
declare const a: Chainable
 
const result1 = a
  .option('foo', 123)
  .option('bar', { value: 'Hello World' })
  .option('name', 'type-challenges')
  .get()
 
const result2 = a
  .option('name', 'another name')
  .option('name', 'last name')
  .get()
 
const result3 = a
  .option('name', 'another name')
  .get()
 
 
type Expected1 = {
  foo: number
  bar: {
    value: string
  }
  name: string
}
 
type Expected2 = {
  name: string
}
 
type Expected3 = {
  name: number
}
ts
/* _____________ Your Code Here _____________ */
 
// type Chainable = {
//   option(key: string, value: any): any
//   get(): any
// }
 
type Chainable = any
 
/* _____________ Test Cases _____________ */
type cases = [
  Expect<Alike<typeof result1, Expected1>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Alike<typeof result2, Expected2>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Alike<typeof result3, Expected3>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
]
 
 
declare const a: Chainable
 
const result1 = a
  .option('foo', 123)
  .option('bar', { value: 'Hello World' })
  .option('name', 'type-challenges')
  .get()
 
const result2 = a
  .option('name', 'another name')
  .option('name', 'last name')
  .get()
 
const result3 = a
  .option('name', 'another name')
  .get()
 
 
type Expected1 = {
  foo: number
  bar: {
    value: string
  }
  name: string
}
 
type Expected2 = {
  name: string
}
 
type Expected3 = {
  name: number
}
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解决方案​

Spoiler warning // Click to reveal answer
ts
 
type Chainable = any
 
ts
 
type Chainable = any
 
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