From f5d654c7ddd8527fd9a0bf31134fe5d8d107388f Mon Sep 17 00:00:00 2001
From: Zhao Bin <413853119@qq.com>
Date: Fri, 9 Aug 2024 17:12:29 +0800
Subject: [PATCH] =?UTF-8?q?docs(ts):=20=E6=8A=84=E5=86=99=20TypeScript=20?=
 =?UTF-8?q?=E7=B1=BB=E5=9E=8B=E7=AB=A0=E8=8A=82=E5=86=85=E5=AE=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .markdownlint.json                            |   1 +
 docs/.vuepress/theme.ts                       |   4 +
 .../theme/components/hanzi/Hanzi.vue          |   2 +-
 .../theme/components/hanzi/Hanzi2.vue         |   2 +-
 .../theme/components/twoslash/style.css       |   4 +
 docs/notes/frontend/ts/README.md              |   2 +
 docs/notes/frontend/ts/handbook/README.md     |  20 +
 docs/notes/frontend/ts/handbook/types.md      | 630 ++++++++++++++++++
 .../vue/vue3/typescript/composition-api.md    |  26 +-
 9 files changed, 676 insertions(+), 15 deletions(-)
 create mode 100644 docs/notes/frontend/ts/handbook/README.md
 create mode 100644 docs/notes/frontend/ts/handbook/types.md

diff --git a/.markdownlint.json b/.markdownlint.json
index 2348c33..c9c0e81 100644
--- a/.markdownlint.json
+++ b/.markdownlint.json
@@ -10,6 +10,7 @@
       "img",
       "sup",
       "em",
+      "mark",
       "Badge",
       "script",
       "IconDisplay",
diff --git a/docs/.vuepress/theme.ts b/docs/.vuepress/theme.ts
index 6d4b4f4..7b97700 100644
--- a/docs/.vuepress/theme.ts
+++ b/docs/.vuepress/theme.ts
@@ -210,6 +210,10 @@ export const themeOptions: ThemeOptions = {
       },
       transformers: [transformerTwoslash()],
     },
+
+    copyCode: {
+      ignoreSelector: ['.vp-copy-ignore'],
+    },
   },
 }
 
diff --git a/docs/.vuepress/theme/components/hanzi/Hanzi.vue b/docs/.vuepress/theme/components/hanzi/Hanzi.vue
index aef7770..2b997d3 100644
--- a/docs/.vuepress/theme/components/hanzi/Hanzi.vue
+++ b/docs/.vuepress/theme/components/hanzi/Hanzi.vue
@@ -207,7 +207,7 @@ function handleRead() {
   <div class="hanzi-main-container">
     <div class="hanzi-main">
       <div class="hanzi-main__left">
-        <div ref="printRef" class="hanzi print" />
+        <div ref="printRef" class="print hanzi" />
         <div ref="aniRef" class="hanzi animation" />
         <div ref="writingRef" class="hanzi writing" />
         <div class="hanzi-controls">
diff --git a/docs/.vuepress/theme/components/hanzi/Hanzi2.vue b/docs/.vuepress/theme/components/hanzi/Hanzi2.vue
index d4551a6..cd1fce4 100644
--- a/docs/.vuepress/theme/components/hanzi/Hanzi2.vue
+++ b/docs/.vuepress/theme/components/hanzi/Hanzi2.vue
@@ -200,7 +200,7 @@ function handleRead() {
             :height="32"
           />
           <div class="hanzi-container">
-            <div ref="printRef" class="print hanzi-card" />
+            <div ref="printRef" class="hanzi-card print" />
             <div ref="aniRef" class="hanzi-card animation" />
             <div class="hanzi-controls">
               <button class="btn-voice btn" title="发音" @click="handleVoice" />
diff --git a/docs/.vuepress/theme/components/twoslash/style.css b/docs/.vuepress/theme/components/twoslash/style.css
index b5e78df..ea6419d 100644
--- a/docs/.vuepress/theme/components/twoslash/style.css
+++ b/docs/.vuepress/theme/components/twoslash/style.css
@@ -62,6 +62,10 @@
   background-color: var(--twoslash-popup-bg);
 }
 
+.twoslash-floating .twoslash-popup-code code {
+  background-color: var(--twoslash-popup-bg);
+}
+
 .twoslash-floating .twoslash-popup-docs,
 .twoslash-floating .twoslash-popup-error {
   padding: 12px !important;
diff --git a/docs/notes/frontend/ts/README.md b/docs/notes/frontend/ts/README.md
index 399fdb9..3a4f991 100644
--- a/docs/notes/frontend/ts/README.md
+++ b/docs/notes/frontend/ts/README.md
@@ -12,3 +12,5 @@ tag:
 # TypeScript 笔记
 
 TypeScript 学习笔记
+
+<Catalog />
diff --git a/docs/notes/frontend/ts/handbook/README.md b/docs/notes/frontend/ts/handbook/README.md
new file mode 100644
index 0000000..badfb43
--- /dev/null
+++ b/docs/notes/frontend/ts/handbook/README.md
@@ -0,0 +1,20 @@
+---
+index: false
+dir:
+  order: 10
+icon: typescript
+category:
+  - 笔记
+  - frontend
+tag:
+  - ts
+  - typescript
+---
+
+# Handbook
+
+[The TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/intro.html)
+
+[Source Code](https://github.com/microsoft/TypeScript-Website/tree/v2/packages/documentation/copy/en/handbook-v2)
+
+<Catalog />
diff --git a/docs/notes/frontend/ts/handbook/types.md b/docs/notes/frontend/ts/handbook/types.md
new file mode 100644
index 0000000..6a4bd72
--- /dev/null
+++ b/docs/notes/frontend/ts/handbook/types.md
@@ -0,0 +1,630 @@
+---
+order: 10
+category:
+  - 笔记
+  - frontend
+tag:
+  - ts
+  - typescript
+---
+
+# Types
+
+## The primitives: `string`, `number`, and `boolean`
+
+JavaScript has three very commonly used primitives: `string`, `number`, and `boolean`.
+
+`number`: JavaScript does not have a special runtime value for integers, so there’s no equivalent to int or float - everything is simply number
+
+::: tip
+The type names `String`, `Number`, and `Boolean` (starting with _capital letters_) are legal, but refer to some special _built-in types_ that will very rarely appear in your code. _Always_ use `string`, `number`, or `boolean` for types.
+:::
+
+## Arrays
+
+To specify the type of an array, you can use the syntax `number[]`.
+this syntax works for any type (e.g. `string[]` is an array of strings, and so on).
+You may also see this written as `Array<number>`, which means the same thing
+
+## any
+
+TypeScript also has a special type, `any`, that you can use whenever you don’t want a particular value to cause typechecking errors.
+
+When a value is of type `any`, you can access any properties of it (which will in turn be of type any), call it like a function, assign it to (or from) a value of any type, or pretty much anything else that’s syntactically legal:
+
+```ts
+let obj: any = { x: 0 }
+// None of the following lines of code will throw compiler errors.
+// Using `any` disables all further type checking, and it is assumed
+// you know the environment better than TypeScript.
+obj.foo()
+obj()
+obj.bar = 100
+obj = 'hello'
+const n: number = obj
+```
+
+### `noImplicitAny`
+
+When you don’t specify a type, and TypeScript can’t infer it from context, the compiler will typically default to `any`.
+
+You usually want to avoid this, though, because any isn’t type-checked. Use the compiler flag `noImplicitAny` to flag any implicit any as an error.
+
+## Type Annotations on Variables
+
+When you declare a variable using `const`, `var`, or `let`, you can optionally add a type annotation to explicitly specify the type of the variable.
+
+In most cases, though, this isn’t needed. Wherever possible, TypeScript tries to automatically _infer_ the types in your code.
+
+```ts
+const myName: string = 'Alice'
+
+// No type annotation needed -- 'myName' inferred as type 'string'
+const myName2 = 'Alice'
+```
+
+## Functions
+
+### Parameter Type Annotations
+
+When you declare a function, you can add type annotations after each parameter to declare what types of parameters the function accepts. Parameter type annotations go after the parameter name:
+
+```ts:no-v-pre twoslash
+function greet(name: string) {
+  console.log("Hello, " + name.toUpperCase() + "!!");
+}
+```
+
+When a parameter has a type annotation, arguments to that function will be checked:
+
+```ts:no-v-pre twoslash
+declare function greet(name: string): void;
+// ---cut---
+// @errors: 2345
+// Would be a runtime error if executed!
+greet(42);
+```
+
+### Return Type Annotations
+
+You can also add return type annotations. Return type annotations appear after the parameter list:
+
+```ts:no-v-pre twoslash
+function getFavoriteNumber(): number {
+  //                          ^^^^^^
+  return 26;
+}
+```
+
+Much like variable type annotations, you usually don't need a return type annotation because TypeScript will infer the function's return type based on its `return` statements.
+
+### Functions Which Return Promises
+
+If you want to annotate the return type of a function which returns a promise, you should use the `Promise` type:
+
+```ts:no-v-pre twoslash
+async function getFavoriteNumber(): Promise<number> {
+  return 26;
+}
+```
+
+### Anonymous Functions
+
+When a function appears in a place where TypeScript can determine how it’s going to be called, the parameters of that function are automatically given types.
+
+This process is called _contextual typing_ because the _context_ that the function occurred within informs what type it should have.
+
+```ts:no-v-pre twoslash
+const names = ["Alice", "Bob", "Eve"];
+
+// Contextual typing for function - parameter s inferred to have type string
+names.forEach(function (s) {
+  console.log(s.toUpperCase());
+});
+
+// Contextual typing also applies to arrow functions
+names.forEach((s) => {
+  console.log(s.toUpperCase());
+});
+```
+
+## Object Types
+
+Apart from primitives, the most common sort of type you’ll encounter is an object type. This refers to any JavaScript value with properties, which is almost all of them! To define an object type, we simply list its properties and their types.
+
+```ts:no-v-pre twoslash
+// The parameter's type annotation is an object type
+function printCoord(pt: {x: number, y: number}) {
+  console.log("The coordinate's x value is " + pt.x);
+  console.log("The coordinate's y value is " + pt.y);
+}
+printCoord({ x: 3, y: 7 });
+```
+
+### Optional Properties
+
+Object types can also specify that some or all of their properties are optional. To do this, add a `?` after the property name:
+
+In JavaScript, if you access a property that doesn't exist, you'll get the value `undefined` rather than a runtime error.
+Because of this, when you _read_ from an optional property, you'll have to _check_ for `undefined` before using it.
+
+```ts:no-v-pre twoslash
+// @errors: 18048
+function printName(obj: { first: string; last?: string }) {
+  // Error - might crash if 'obj.last' wasn't provided!
+  console.log(obj.last.toUpperCase());
+  if (obj.last !== undefined) {
+    // OK
+    console.log(obj.last.toUpperCase());
+  }
+
+  // A safe alternative using modern JavaScript syntax:
+  console.log(obj.last?.toUpperCase());
+}
+```
+
+## Union Types
+
+TypeScript’s type system allows you to build new types out of existing ones using a large variety of operators.
+Now that we know how to write a few types, it’s time to start combining them in interesting ways.
+
+### Defining a Union Type
+
+A union type is a type formed from two or more other types, representing values that may be any one of those types.
+
+```ts:no-v-pre twoslash
+// @errors: 2345
+function printId(id: number | string) {
+  console.log("Your ID is: " + id);
+}
+// OK
+printId(101);
+// OK
+printId("202");
+// Error
+printId({ myId: 1234 })
+```
+
+### Working with Union Types
+
+It's easy to _provide_ a value matching a union type - simply provide a type matching any of the union's members.
+
+TypeScript will only allow an operation if it is valid for _every_ member of the union.
+For example, if you have the union `string | number`, you can't use methods that are only available on `string`:
+
+```ts:no-v-pre twoslash
+// @errors: 2339
+function printId(id: number | string) {
+  console.log(id.toUpperCase())
+}
+```
+
+The solution is to _narrow_ the union with code, the same as you would in JavaScript without type annotations.
+_Narrowing_ occurs when TypeScript can deduce a more specific type for a value based on the structure of the code.
+
+```ts:no-v-pre twoslash
+function printId(id: number | string) {
+  if (typeof id === 'string') {
+     // In this branch, id is of type 'string'
+    console.log(id.toUpperCase())
+  } else {
+    // Here, id is of type 'number'
+    console.log(id)
+  }
+}
+```
+
+Another example is to use a function like `Array.isArray`:
+
+```ts:no-v-pre twoslash
+function welcomePeople(x: string[] | string) {
+  if (Array.isArray(x)) {
+    // Here: 'x' is 'string[]'
+    console.log('Hello, ' + x.join(' and '))
+  } else {
+    // Here: 'x' is 'string'
+    console.log("Welcome lone traveler " + x);
+  }
+}
+```
+
+If every member in a union has a property in common, you can use that property without narrowing:
+
+```ts:no-v-pre twoslash
+// Return type is inferred as number[] | string
+function getFirstThree(x: number[] | string) {
+  return x.slice(0, 3)
+}
+```
+
+## Type Aliases
+
+It's common to want to use the same type more than once and refer to it by a single name.
+
+A _type alias_ is exactly that - a _name_ for any _type_.
+The syntax for a type alias is:
+
+```ts:no-v-pre twoslash {1}
+type Point = {
+  x: number
+  y: number
+}
+
+function printCoord(pt: Point) {
+  console.log("The coordinate's x value is " + pt.x)
+  console.log("The coordinate's y value is " + pt.y)
+}
+
+printCoord({ x: 100, y: 200 })
+```
+
+You can actually use a type alias to give a name to any type at all, not just an object type.
+For example, a type alias can name a union type:
+
+```ts:no-v-pre twoslash
+type ID = number | string
+```
+
+When you use the alias, it's exactly as if you had written the aliased type.
+
+```ts:no-v-pre twoslash
+
+type UserInputSanitizedString = string
+declare function getInput(): string
+declare function sanitize(str: string): string
+// ---cut---
+function sanitizeInput(str: string): UserInputSanitizedString {
+  return sanitize(str)
+}
+
+// Create a sanitized input
+let userInput = sanitizeInput(getInput())
+
+// Can still be re-assigned with a 'string' though
+userInput = 'new input'
+```
+
+## Interfaces
+
+An _interface declaration_ is another way to name an object type:
+
+```ts:no-v-pre twoslash {1}
+interface Point {
+  x: number
+  y: number
+}
+
+function printCoord(pt: Point) {
+  console.log("The coordinate's x value is " + pt.x)
+  console.log("The coordinate's y value is " + pt.y)
+}
+
+printCoord({ x: 100, y: 200 })
+```
+
+### Differences Between Type Aliases and Interfaces
+
+Type aliases and interfaces are very similar, and in many cases you can choose between them freely.
+Almost all features of an `interface` are available in `type`, the key distinction is that a <mark>_type cannot be re-opened to add new properties_</mark> vs <mark>_an interface which is always extendable_</mark>.
+
+::: tabs
+
+@tab Interface#interface
+
+Extending an interface
+
+```ts:no-v-pre twoslash {5}
+declare function getBear(): Bear
+// ---cut---
+interface Animal {
+  name: string;
+}
+
+interface Bear extends Animal {
+  honey: boolean;
+}
+
+const bear = getBear();
+bear.name;
+bear.honey;
+```
+
+Adding new fields to an existing interface
+
+```ts
+interface Window {
+  title: string
+}
+
+interface Window {
+  ts: TypeScriptAPI
+}
+
+const src = 'const a = "Hello World"'
+window.ts.transpileModule(src, {})
+```
+
+@tab Type#type
+
+Extending a type via intersections
+
+```ts:no-v-pre twoslash {5}
+declare function getBear(): Bear
+// ---cut---
+type Animal = {
+  name: string;
+}
+
+type Bear = Animal & {
+  honey: boolean;
+}
+
+const bear = getBear();
+bear.name;
+bear.honey;
+```
+
+A type cannot be changed after being created
+
+```ts
+interface Window {
+  title: string
+}
+
+// Error: Duplicate identifier 'Window'.
+interface Window {
+  ts: TypeScriptAPI
+}
+```
+
+:::
+
+## Type Assertions
+
+Sometimes you will have information about the type of a value that TypeScript can’t know about.
+
+In this situation, you can use a _type assertion_ to specify a more specific type:
+
+```ts:no-v-pre twoslash
+const myCanvas = document.getElementById("main_canvas") as HTMLCanvasElement;
+```
+
+You can also use the angle-bracket syntax (except if the code is in a `.tsx` file), which is equivalent:
+
+```ts:no-v-pre twoslash
+const myCanvas = <HTMLCanvasElement>document.getElementById("main_canvas");
+```
+
+TypeScript only allows type assertions which convert to a _more specific_ or _less specific_ version of a type.
+This rule prevents "impossible" coercions like:
+
+```ts:no-v-pre twoslash
+// @errors: 2352
+const x = "hello" as number
+```
+
+Sometimes this rule can be too conservative and will disallow more complex coercions that might be valid.
+If this happens, you can use two assertions, first to `any` (or `unknown`, which we'll introduce later), then to the desired type:
+
+```ts:no-v-pre twoslash
+declare const expr: any
+type T = { a: 1; b: 2; c: 3; }
+// ---cut---
+const a = expr as any as T
+```
+
+## Literal Types
+
+Both `var` and `let` allow for changing what is held inside the variable, and `const` does not.
+This is reflected in how TypeScript creates types for literals.
+
+```ts:no-v-pre twoslash
+let changingString = 'Hello World'
+changingString = 'zhaobc';
+
+// Because `changingString` can represent any possible string, that
+// is how TypeScript describes it in the type system
+changingString;
+// ^?
+
+const constantString = 'Hello World'
+// Because `constantString` can only represent 1 possible string, it
+// has a literal type representation
+constantString;
+// ^?
+
+```
+
+By themselves, literal types aren't very valuable:
+
+```ts:no-v-pre twoslash
+// @errors: 2322
+let x: 'hello' = 'hello'
+// OK
+x = 'hello'
+// NG
+x = 'zhaobc'
+```
+
+It's not much use to have a variable that can only have one value!
+
+But by _combining_ literals into unions, you can express a much more useful concept - for example, functions that only accept a certain set of known values:
+
+```ts:no-v-pre twoslash
+// @errors: 2345
+function printText(s: string, alignment: 'left' | 'center' | 'right') {
+  // ...
+}
+
+printText('Hello', 'left')
+printText('World', 'centre')
+```
+
+Numeric literal types work the same way:
+
+```ts:no-v-pre twoslash
+function compare(a: string, b: string): -1 | 0 | 1 {
+  return a === b ? 0 : a > b ? 1 : -1
+}
+```
+
+Of course, you can combine these with non-literal types:
+
+```ts:no-v-pre twoslash
+// @errors: 2345
+interface Options {
+  width: number | string
+}
+
+function configure(x: Options | 'auto') {
+  // ...
+}
+
+configure({ width: 100 })
+configure('auto')
+configure('automatic')
+```
+
+### Literal Inference
+
+When you initialize a variable with an object, TypeScript assumes that the properties of that object might change values later. For example, if you wrote code like this:
+
+```ts:no-v-pre twoslash
+declare const someCondition = true
+// ---cut---
+const obj = {
+  counter: 0
+  // ^?
+}
+
+if (someCondition) {
+  obj.counter = 1
+}
+```
+
+TypeScript _doesn’t_ assume the assignment of `1` to a field which previously had `0` is an error. Another way of saying this is that `obj.counter` must have the type `number`, not `0`, because types are used to determine both reading and writing behavior.
+
+The same applies to strings:
+
+```ts:no-v-pre twoslash
+// @errors: 2345
+declare function handleRequest(url: string, method: 'GET' | 'POST'): void
+
+const req = {
+  url: 'http://example.com',
+  method: 'GET'
+}
+handleRequest(req.url, req.method)
+```
+
+In the above example `req.method` is inferred to be `string`, not `"GET"`. Because code can be evaluated between the creation of `req` and the call of `handleRequest` which could assign a new string like `"GUESS"` to `req.method`, TypeScript considers this code to have an error.
+
+There are two ways to work around this.
+
+1. You can change the inference by adding a <mark>type assertion</mark> in either location:
+
+   ```ts:no-v-pre twoslash
+   declare function handleRequest(url: string, method: "GET" | "POST"): void;
+   // ---cut---
+   // Change 1:
+   const req = { url: "https://example.com", method: "GET" as "GET" };
+   // Change 2
+   handleRequest(req.url, req.method as "GET");
+   ```
+
+   Change 1 means "I intend for `req.method` to always have the _literal type_ `"GET"`", preventing the possible assignment of `"GUESS"` to that field after.
+   Change 2 means "I know for other reasons that `req.method` has the value `"GET"`".
+
+2. You can use <mark>`as const`</mark> to convert the entire object to be type literals:
+
+   ```ts:no-v-pre twoslash
+   declare function handleRequest(url: string, method: "GET" | "POST"): void;
+   // ---cut---
+   const req = { url: "https://example.com", method: "GET" } as const;
+   handleRequest(req.url, req.method);
+   ```
+
+The `as const` suffix acts like `const` but for the type system, ensuring that <mark>all properties are assigned the literal type</mark> instead of a more general version like `string` or `number`.
+
+## `null` and `undefined`
+
+JavaScript has two primitive values used to signal absent or uninitialized value: `null` and `undefined`.
+
+TypeScript has two corresponding _types_ by the same names. How these types behave depends on whether you have the [`strictNullChecks`] option on.
+
+### `strictNullChecks` off
+
+With [`strictNullChecks`] _off_, values that might be `null` or `undefined` can still be accessed normally, and the values `null` and `undefined` can be assigned to a property of any type.
+The lack of checking for these values tends to be a major source of bugs; we always recommend people turn [`strictNullChecks`](/tsconfig#strictNullChecks) on if it's practical to do so in their codebase.
+
+### `strictNullChecks` on
+
+With [`strictNullChecks`] _on_, when a value is `null` or `undefined`, you will need to test for those values before using methods or properties on that value.
+Just like checking for `undefined` before using an optional property, we can use _narrowing_ to check for values that might be `null`:
+
+```ts:no-v-pre twoslash
+function doSomething(x: string | null) {
+  if (x === null) {
+    // do nothing
+  } else {
+    console.log(x.toUpperCase())
+  }
+}
+```
+
+### Non-null Assertion Operator (Postfix `!`)
+
+TypeScript also has a special syntax for removing `null` and `undefined` from a type without doing any explicit checking.
+Writing `!` after any expression is effectively a type assertion that the value isn't `null` or `undefined`:
+
+```ts:no-v-pre twoslash
+function liveDangerously(x?: number | null) {
+  // No error
+  console.log(x!.toFixed())
+}
+```
+
+Just like other type assertions, this doesn't change the runtime behavior of your code,
+so <mark>it's important to only use `!` when you know that the value _can't_ be `null` or `undefined`</mark>.
+
+## Enums
+
+Enums allow a developer to define a set of named constants.
+
+```ts:no-v-pre twoslash
+enum Direction {
+  Up,
+  Down,
+  Left,
+  Right
+}
+```
+
+## Less Common Primitives
+
+### `bigint`
+
+From ES2020 onwards, there is a primitive in JavaScript used for very large integers, `BigInt`:
+
+```ts:no-v-pre twoslash
+// @target: es2020
+
+// Creating a bigint via the BigInt function
+const oneHundred: bigint = BigInt(100)
+// Creating a BigInt via the literal syntax
+const anotherHundred: bigint = 100n
+```
+
+### `symbol`
+
+There is a primitive in JavaScript used to create a globally unique reference via the function `Symbol()`:
+
+```ts:no-v-pre twoslash
+// @errors: 2367
+const firstName = Symbol('name')
+const secondName = Symbol('name')
+
+if (firstName === secondName) {
+  // Can't even happen
+}
+```
diff --git a/docs/notes/frontend/vue/vue3/typescript/composition-api.md b/docs/notes/frontend/vue/vue3/typescript/composition-api.md
index 9634899..436b457 100644
--- a/docs/notes/frontend/vue/vue3/typescript/composition-api.md
+++ b/docs/notes/frontend/vue/vue3/typescript/composition-api.md
@@ -21,9 +21,9 @@ tag:
 const props = defineProps({
   foo: {
     type: String,
-    required: true
+    required: true,
   },
-  bar: Number
+  bar: Number,
 })
 
 props.foo // string
@@ -83,7 +83,7 @@ export interface Props {
 
 const props = withDefaults(defineProps<Props>(), {
   msg: 'hello',
-  labels: () => ['one', 'two']
+  labels: () => ['one', 'two'],
 })
 ```
 
@@ -102,11 +102,11 @@ import { defineComponent } from 'vue'
 
 export default defineComponent({
   props: {
-    message: String
+    message: String,
   },
   setup(props) {
     props.message // <-- 类型：string
-  }
+  },
 })
 ```
 
@@ -134,7 +134,7 @@ const props = defineProps<{
 import type { PropType } from 'vue'
 
 const props = defineProps({
-  book: Object as PropType<Book>
+  book: Object as PropType<Book>,
 })
 ```
 
@@ -146,8 +146,8 @@ import type { PropType } from 'vue'
 
 export default defineComponent({
   props: {
-    book: Object as PropType<Book>
-  }
+    book: Object as PropType<Book>,
+  },
 })
 ```
 
@@ -175,7 +175,7 @@ const emit = defineEmits({
     // 返回 `true` 或 `false`
     // 表明验证通过或失败
     return true
-  }
+  },
 })
 </script>
 ```
@@ -213,7 +213,7 @@ export default defineComponent({
   emits: ['change'],
   setup(props, { emit }) {
     emit('change') // <-- 类型检查 / 自动补全
-  }
+  },
 })
 ```
 
@@ -272,7 +272,7 @@ onMounted(() => {
 </script>
 
 <template>
-  <input ref="el">
+  <input ref="el" />
 </template>
 ```
 
@@ -290,10 +290,10 @@ onMounted(() => {
 import { ref } from 'vue'
 
 const isContentShown = ref(false)
-const open = () => isContentShown.value = true
+const open = () => (isContentShown.value = true)
 
 defineExpose({
-  open
+  open,
 })
 </script>
 ```