deno repl，交互式脚本提示

deno repl [OPTIONS] [-- [ARGS]...]

Options Jump to heading#

--cert Jump to heading#

Load certificate authority from PEM encoded file.

--config Jump to heading#

Short flag: -c

Configure different aspects of deno including TypeScript, linting, and code formatting Typically the configuration file will be called deno.json or deno.jsonc and automatically detected; in that case this flag is not necessary.

--env-file Jump to heading#

Load environment variables from local file Only the first environment variable with a given key is used. Existing process environment variables are not overwritten, so if variables with the same names already exist in the environment, their values will be preserved. Where multiple declarations for the same environment variable exist in your .env file, the first one encountered is applied. This is determined by the order of the files you pass as arguments.

--eval Jump to heading#

Evaluates the provided code when the REPL starts.

--eval-file Jump to heading#

Evaluates the provided file(s) as scripts when the REPL starts. Accepts file paths and URLs.

--location Jump to heading#

Value of globalThis.location used by some web APIs.

--no-config Jump to heading#

Disable automatic loading of the configuration file.

--seed Jump to heading#

Set the random number generator seed.

--v8-flags Jump to heading#

To see a list of all available flags use --v8-flags=--help Flags can also be set via the DENO_V8_FLAGS environment variable. Any flags set with this flag are appended after the DENO_V8_FLAGS environment variable.

Dependency management options Jump to heading#

--cached-only Jump to heading#

Require that remote dependencies are already cached.

--frozen Jump to heading#

Error out if lockfile is out of date.

--import-map Jump to heading#

Load import map file from local file or remote URL.

--lock Jump to heading#

Check the specified lock file. (If value is not provided, defaults to "./deno.lock").

--no-lock Jump to heading#

Disable auto discovery of the lock file.

--no-npm Jump to heading#

Do not resolve npm modules.

--no-remote Jump to heading#

Do not resolve remote modules.

--node-modules-dir Jump to heading#

Sets the node modules management mode for npm packages.

--reload Jump to heading#

Short flag: -r

Reload source code cache (recompile TypeScript) no value Reload everything jsr:@std/http/file-server,jsr:@std/assert/assert-equals Reloads specific modules npm: Reload all npm modules npm:chalk Reload specific npm module.

--vendor Jump to heading#

Toggles local vendor folder usage for remote modules and a node_modules folder for npm packages.

Debugging options Jump to heading#

--inspect Jump to heading#

Activate inspector on host:port [default: 127.0.0.1:9229]

--inspect-brk Jump to heading#

Activate inspector on host:port, wait for debugger to connect and break at the start of user script.

--inspect-wait Jump to heading#

Activate inspector on host:port and wait for debugger to connect before running user code.

特殊变量 Jump to heading#

REPL 提供了一些特殊变量，始终可用：

Deno 1.14.3
使用 ctrl+d 或 close() 退出
> "hello world!"
"hello world!"
> _
"hello world!"
> const foo = "bar";
undefined
> _
undefined

特殊函数 Jump to heading#

REPL 在全局作用域提供了几个函数：

--eval 标志 Jump to heading#

--eval 标志允许您在进入 REPL 之前运行一些代码。这对于导入您在 REPL 中常用的一些代码或以某种方式修改运行时尤其有用：

$ deno repl --allow-net --eval 'import { assert } from "jsr:@std/assert@1"'
Deno 1.45.3
使用 ctrl+d、ctrl+c 或 close() 退出
> assert(true)
undefined
> assert(false)
未捕获 AssertionError
    at assert (https://jsr.io/@std/assert/1.0.0/assert.ts:21:11)
    at :1:22

--eval-file 标志 Jump to heading#

--eval-file 标志允许您在进入 REPL 之前从指定文件运行代码。与 --eval 标志类似，这对于导入您在 REPL 中常用的代码或以某种方式修改运行时也很有用。

可以将文件指定为路径或 URL。URL 文件会被缓存，并可以通过 --reload 标志重新加载。

如果同时指定了 --eval，则 --eval-file 文件将在 --eval 代码之前运行。

$ deno repl --eval-file=https://docs.deno.com/examples/welcome.ts,https://docs.deno.com/examples/local.ts
下载 https://docs.deno.com/examples/welcome.ts
欢迎使用 Deno！
下载 https://docs.deno.com/examples/local.ts
Deno 1.45.3
使用 ctrl+d 或 close() 退出
> local // 这个变量在 local.ts 中被本地定义，但未被导出
"This is a local variable inside of local.ts"

相对导入路径解析 Jump to heading#

如果 --eval-file 指定的代码文件包含相对导入，则运行时将尝试将导入相对于当前工作目录解析。它不会尝试相对于代码文件的位置解析。这可能导致使用模块文件时出现 "Module not found" 错误：

$ deno repl --eval-file=https://jsr.io/@std/encoding/1.0.0/ascii85.ts
--eval-file 文件 https://jsr.io/@std/encoding/1.0.0/ascii85.ts 中出错。未捕获 TypeError: 找不到模块 "file:///home/_validate_binary_like.ts"。
    at async :2:13
Deno 1.45.3
使用 ctrl+d 或 close() 退出
>

Tab 补全 Jump to heading#

Tab 补全是 REPL 中快速导航的重要功能。在按下 tab 键后，Deno 会显示所有可能补全的列表。

$ deno repl
Deno 1.45.3
使用 ctrl+d 或 close() 退出
> Deno.read
readTextFile      readFile          readDirSync       readLinkSync      readAll           read
readTextFileSync  readFileSync      readDir           readLink          readAllSync       readSync

快捷键 Jump to heading#

DENO_REPL_HISTORY Jump to heading#

您可以使用 DENO_REPL_HISTORY 环境变量来控制 Deno 存储 REPL 历史文件的位置。您可以将其设置为空值，Deno 将不会存储历史文件。