2481 错误 Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'. 无法在块范围声明“{1}”所在的范围内初始化外部范围变量“{0}”。2483 错误 The left-hand side of a 'for...of' statement cannot use a type annotation. "for...of" 语句的左侧...
type Strings = [string, string]; type Numbers = number[]; // [string, string, ...Array<number | boolean>] type Unbounded = [...Strings, ...Numbers, boolean]; 对于再复杂一些的场景,例如高阶函数 partialCall,支持一定程度的柯里化: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 func...
enum LogLevel { ERROR, WARN, INFO, DEBUG, } /** * 这相当于: * type LogLevelStrings = 'ERROR' | 'WARN' | 'INFO' | 'DEBUG'; */ type LogLevelStrings = keyof typeof LogLevel; function printImportant(key: LogLevelStrings, message: string) { const num = LogLevel[key]; if (num ...
function initializeTypeChecker() { // Bind all source files and propagate errors for (const file of host.getSourceFiles()) { bindSourceFile(file, compilerOptions); } // Initialize global symbol table let augmentations: LiteralExpression[][]; for (const file of host.getSourceFiles()) { if ...
type Strings=[string,string];type Numbers=number[]// [string, string, ...Array<number | boolean>]type Unbounded=[...Strings,...Numbers,boolean]; 将这两种行为结合在一起,我们可以为concat编写一个类型良好的签名: 代码语言:javascript 复制 ...
There’s one more kind of literal type: boolean literals. There are only two boolean literal types, and as you might guess, they are the types true and false. The type boolean itself is actually just an alias for the union true | false. Literal Inference When you initialize a variable ...
type Strings = [string, string]; type Numbers = number[]; // [string, string, ...Array<number | boolean>] type Unbounded = [...Strings, ...Numbers, boolean]; 对于再复杂一些的场景,例如高阶函数 partialCall,支持一定程度的柯里化: function partialCall(f, ...headArgs) { return (.....
2481 错误 Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'. 无法在块范围声明“{1}”所在的范围内初始化外部范围变量“{0}”。2483 错误 The left-hand side of a 'for...of' statement cannot use a type annotation. "for...of" 语句的左侧...
# Initializes a watcher process that will keep main.js up to date. tsc main.ts--watch 有经验的TypeScript用户可创建tsconfig.json文件,包含各种构建设置。处理大量.ts文件的大型项目时,配置文件非常方便,可以自动完成构建过程。可在此处的TypeScript文档中了解到有关tsconfig.json的更多信息 ...
initialize(sideLength: number) { this.sideLength = sideLength; } get area() { return this.sideLength ** 2; } }Try For more details, see the implementing pull request. Short-Circuiting Assignment Operators JavaScript, and a lot of other languages, support a set of operators called compound...