chenshenhai / deno_note Goto Github PK

原有demo和教程是基于[email protected]

• 在v0.4.0 以后，官方支持了子命令，执行方式变了，原有demo全部跑不动了 o(╯□╰)o
• Deno原生指令使用方式做了重构，需要重新梳理笔记教程

在没完成升级v0.7.0之前，不建议直接git clone 学习。
如果想跑起所有demo案例，必须保证在[email protected]的环境里

[email protected] 已经支持全局变量Deno，Deno官方声明了未来的版本将不会兼容 import deno from "deno" 的方式，后续笔记例子源码需要全面替换修改。

官方v0.3.0 说明
The major API change in this release is that instead of importing a "deno" module, there is now a global variable called Deno. This allows code that does deno-specific stuff to still operate in browsers. We will remain backward compatible with the old way of importing core functionality, but it will be removed in the near future, so please update your code.

https://github.com/denoland/deno/blob/master/Releases.md#v030--20190218

在windows 10 中没有，Deno.platform

代码

const apiList = Object.keys(window)
const CRLF = '\r\n'
console.log(`Supported global Api[count:${apiList.length}]:${CRLF}`);
console.log(`${apiList.join(','+CRLF)}`)

版本和执行结果

➜  denodemo deno --version         
deno 0.36.0
v8 8.1.310
typescript 3.8.3
➜  denodemo deno run ./src/showwindow.ts 
Supported global Api[count:19]:

console,
Deno,
queueMicrotask,
atob,
btoa,
clearInterval,
clearTimeout,
fetch,
setInterval,
setTimeout,
performance,
addEventListener,
dispatchEvent,
removeEventListener,
window,
self,
crypto,
onload,
onunload

要不要使用 Pagic 搭建一个网站？若 @chenshenhai 同意的话，我可以帮忙完成第一版的工作😊

Pagic 是用 Deno 实现的一个静态网站生成器，这是第一个使用 Pagic 搭建的网站：
https://ts.xcatliu.com/

特性：

• github actions 持续集成发布
• 静态网页 + 单页应用——页面初次加载性能最优，页面间跳转时能无缝跳转
• 深色模式
• gitalk 评论
• 更多功能开发中

这是第二个使用 Pagic 搭建的网站：
https://deno-tutorial.js.org/

应该是mkdir吧?

➜ Deno $ deno example.ts

️⚠️ Deno requests network access to "127.0.0.1:3001". Grant? [a/y/n/d (a = allow always, y = allow once, n = deny once, d = deny always)] a
listening on 127.0.0.1:3001
thread 'tokio-runtime-worker-0' panicked at 'bad rid', ../../cli/resources.rs:273:15
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace.
thread 'main' panicked at 'internal error: entered unreachable code', ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/tokio-0.1.22/src/runtime/threadpool/mod.rs:296:26
thread 'main' panicked at 'unexpected state while aborting task: Complete', ../../third_party/rust_crates/registry/src/github.com-1ecc6299db9ec823/tokio-threadpool-0.1.15/src/task/mod.rs:216:21
stack backtrace:
0: 0x1075ad062 - std::panicking::take_hook::hb25650a43c7b4abc
1: 0x1075acd2b - std::panicking::take_hook::hb25650a43c7b4abc
2: 0x1075ad850 - std::panicking::rust_panic_with_hook::h7d6a669f1a899680
3: 0x1075ad37d - std::panicking::begin_panic_fmt::h5340abefa09e06ca
4: 0x1075ad2d1 - std::panicking::begin_panic_fmt::h5340abefa09e06ca
5: 0x1085265d9 - tokio_threadpool::pool::backup_stack::<impl core::convert::From<tokio_threadpool::pool::backup_stack::State> for usize>::from::h22f244c8801cbba7
6: 0x10852e7af - <tokio_threadpool::shutdown::ShutdownTrigger as core::ops::drop::Drop>::drop::h134c463c5ff9ac9e
7: 0x10852aafc - <tokio_threadpool::task::Run as core::fmt::Debug>::fmt::h6b791071bd8e3ab7
8: 0x108521a9a - tokio_threadpool::thread_pool::ThreadPool::shutdown_now::h6c753972452ea1f4
9: 0x1084fed0d - tokio::runtime::current_thread::runtime::Runtime::run::h9d7c951fd5cdd0a1
10: 0x1085026a8 - <tokio::runtime::threadpool::Runtime as core::ops::drop::Drop>::drop::h0fc176c521b72182
11: 0x1087cb1bc - <arc_swap::Protection as core::convert::From<core::option::Option<&arc_swap::debt::Debt>>>::from::h427ca8060d312f50
12: 0x1088c2368 - <arc_swap::Protection as core::convert::From<core::option::Option<&arc_swap::debt::Debt>>>::from::h427ca8060d312f50
13: 0x1087b7e46 - <arc_swap::Protection as core::convert::From<core::option::Option<&arc_swap::debt::Debt>>>::from::h427ca8060d312f50
14: 0x1075ad1e8 - std::panicking::update_panic_count::hb4c719f9cf8762c5
15: 0x1075bcc4f - __rust_maybe_catch_panic
16: 0x1075adcce - std::rt::lang_start_internal::hc1ac2c20e9f8edf2
17: 0x1088c3939 - main
thread panicked while panicking. aborting.
[1] 28483 illegal hardware instruction deno example.ts

const files: Deno.FileInfo[] = Deno.readDirSync("./assets");

指定files为Deno.FileInfo[]类型后会发现单个file中的属性都无法访问，很奇怪的的事。

当前使用的版本是0.4.1

需要加上参数--allow-net
以命令：
deno --allow-net .\example.ts
来启动

子进程管道输出代码

const process = Deno.run({
  args:['deno','run','--allow-net', './server.ts'],
  stdout: 'piped'
})
const stdout = process.stdout
const chunk =  new Uint8Array(1024)
await stdout.read(chunk)

console.log(`[process.stdout]:${new TextDecoder().decode(chunk)}`);


setTimeout(() => {
  process.close()
}, 1000*60);

执行代码报错，没找到原因

➜  process deno run --allow-run run.ts         
Compile file:///work/coding/learn/denodemo/src/process/run.ts
error TS2532: Object is possibly 'undefined'.

► file:///work/coding/learn/denodemo/src/process/run.ts:7:7

7 await stdout.read(chunk)

denoland/deno#1757
应该下个版本的release就可以解决这个问题

[email protected] 把TS模式设置默认 严格模式，本书的例子都要修改一遍，以支持接下来的最新版本的Deno

Enable TS strict mode by default