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js_deno

deno-specific js bindings

js
deno
moon add mizchi/js_deno@0.12.2
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README

#mizchi/js_deno

MoonBit bindings for Deno runtime APIs.

#Deno API Support Status

CategoryAPIStatusNote
Runtime
Environment Variablesenv_get/set/delete/toObject🧪 TestedProcess environment
Processcwd/exit/args🧪 TestedProcess information
File System
Read/Write TextreadTextFile/writeTextFile🧪 TestedText file operations
Read/Write BinaryreadFile/writeFile🧪 TestedBinary file operations
DirectoryreadDir/mkdir/remove🧪 TestedDirectory operations
Testing
Test Definitiontest_/test_async/test_only🧪 TestedTest framework
Permissions
Query/Request/Revokepermissions_*🧪 TestedPermission management
PermissionStatusstate/is_granted🧪 TestedPermission state
Subprocess
CommandCommand::new/output/outputSync/spawn🧪 TestedProcess spawning
CommandOutputcode/success/stdout/stderr🧪 TestedSubprocess output
ChildProcessstatus/output/stdin/stdout/stderr🧪 TestedSpawned process
Planned APIs
Networkconnect/listen/serve📅 PlannedTCP/HTTP networking
KVopenKv📅 PlannedKey-value storage
FFIdlopen📅 PlannedForeign function interface
WebGPUDeno.gpu📅 PlannedGPU acceleration

#Status Legend

  • 🧪 Tested: Comprehensive test coverage
  • 📅 Planned: Scheduled for future implementation

#Using Node.js APIs in Deno

For APIs not yet implemented in the Deno-specific bindings, you can use Node.js compatibility packages:

// Use Node.js fs instead of Deno's file APIs
fn example() -> Unit {
  @js.run_async(fn() {
    let content = @fs_promises.readFile("file.txt", "utf-8").await
    @console.log(content)
  })
}

Deno provides built-in Node.js compatibility. See:

#Installation

Add to your moon.pkg.json:

{
  "import": [
    "mizchi/js",
    "mizchi/js_deno"
  ]
}

#API

#Process/Runtime APIs

  • Deno::env_get(key) - Get environment variable
  • Deno::env_set(key, value) - Set environment variable
  • Deno::env_delete(key) - Delete environment variable
  • Deno::env_toObject() - Get all environment variables
  • Deno::cwd() - Get current working directory
  • Deno::exit(code?) - Exit the process
  • Deno::args() - Get command line arguments

#File System APIs

  • Deno::readTextFile(path) - Read text file (returns Promise[String])
  • Deno::writeTextFile(path, data) - Write text file (returns Promise[Unit])
  • Deno::readFile(path) - Read file as Uint8Array (returns Promise[Js])
  • Deno::writeFile(path, data) - Write file from Uint8Array (returns Promise[Unit])
  • Deno::remove(path, recursive?) - Remove file or directory (returns Promise[Unit])
  • Deno::mkdir(path, recursive?) - Create directory (returns Promise[Unit])
  • Deno::readDir(path) - Read directory entries

#Test APIs

  • Deno::test_(name, fn) - Define a test (synchronous)
  • Deno::test_async(name, fn) - Define a test (asynchronous)
  • Deno::test_only(name, fn) - Define a test marked as "only"

#Permissions API

  • Deno::permissions_query(name, path?) - Query permission status (returns Promise[PermissionStatus])
  • Deno::permissions_request(name, path?) - Request permission (returns Promise[PermissionStatus])
  • Deno::permissions_revoke(name, path?) - Revoke permission (returns Promise[PermissionStatus])
  • PermissionStatus::state() - Get permission state ("granted", "denied", "prompt")
  • PermissionStatus::is_granted() - Check if permission is granted

#Example

fn main {
  let d = @deno.deno()

  // Environment variables
  d.env_set("MY_VAR", "hello")
  let value = d.env_get("MY_VAR")

  // Current directory
  let cwd = d.cwd()
  println(cwd)

  // Command line args
  let args = d.args()

  // File operations (async)
  d.writeTextFile("test.txt", "Hello, Deno!").await()
  let content = d.readTextFile("test.txt").await()
  println(content)

  // Permissions
  let status = d.permissions_query("read", path="/tmp").await()
  if status.is_granted() {
    println("Read permission granted")
  }
}

#Testing with Deno

To use these bindings with Deno's test runner, create a test file:

fn main {
  let d = @deno.deno()

  d.test_async("file operations", fn(_ctx) {
    d.writeTextFile("test.txt", "content").await()
    let result = d.readTextFile("test.txt").await()
    assert_eq(result, "content")
    d.remove("test.txt").await()
  })
}

Then run with:
moon build --target js
deno test --allow-all target/js/release/build/mizchi/js_deno/_tests/_tests.js

#Notes

  • Most file system operations require --allow-read and --allow-write permissions
  • Network operations require --allow-net permission
  • Environment variable access requires --allow-env permission
  • For testing, use --allow-all or specify individual permissions

#Status

This is a basic implementation of Deno APIs. More APIs will be added as needed.

#
ChildProcess

source
#external
pub type ChildProcess

ChildProcess - spawned subprocess https://docs.deno.com/api/deno/~/Deno.ChildProcess

#
ChildProcess::as_any

source

#
ChildProcess::kill

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fn ChildProcess::kill(self : ChildProcess, signal? : String) -> Unit

Send signal to process

#
ChildProcess::pid

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fn ChildProcess::pid(self : ChildProcess) -> Int

Get process ID

#
ChildProcess::ref_

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fn ChildProcess::ref_(self : ChildProcess) -> Unit

Allow process to keep event loop alive (default)

#
ChildProcess::status

source
async fn ChildProcess::status(self : ChildProcess) -> CommandStatus

Wait for process to complete

#
ChildProcess::stderr

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Get stderr stream (ReadableStream)

#
ChildProcess::stdin

source

Get stdin stream (WritableStream)

#
ChildProcess::stdout

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Get stdout stream (ReadableStream)

#
ChildProcess::unref

source
fn ChildProcess::unref(self : ChildProcess) -> Unit

Prevent process from keeping event loop alive

#
Command

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#external
pub type Command

Command type for creating subprocesses https://docs.deno.com/api/deno/~/Deno.Command

#
Command::as_any

source
fn Command::as_any(self : Command) -> 
Any

#
Command::new

source
fn Command::new(program : String, args? : Array[String], cwd? : String, env? : 
Any, stdin? : String, stdout? : String, stderr? : String) -> Command

Create a new Command to run a program

#
Command::output

source
async fn Command::output(self : Command) -> CommandOutput

Execute command and collect output https://docs.deno.com/api/deno/~/Deno.Command#method_output_0

#
Command::outputSync

source
#alias(output_sync)
fn Command::outputSync(self : Command) -> CommandOutput

Execute command synchronously and collect output https://docs.deno.com/api/deno/~/Deno.Command#method_outputSync_0

#
Command::spawn

source
fn Command::spawn(self : Command) -> ChildProcess

Spawn a subprocess https://docs.deno.com/api/deno/~/Deno.Command#method_spawn_0

#
CommandOutput

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#external
pub type CommandOutput

CommandOutput - result of Command.output()

#
CommandOutput::as_any

source

#
CommandOutput::code

source
fn CommandOutput::code(self : CommandOutput) -> Int

Get exit code from CommandOutput

#
CommandOutput::signal

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fn CommandOutput::signal(self : CommandOutput) -> String?

Get signal that terminated the process (if any)

#
CommandOutput::stderr

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Get stderr as Uint8Array

#
CommandOutput::stdout

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Get stdout as Uint8Array

#
CommandOutput::success

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fn CommandOutput::success(self : CommandOutput) -> Bool

Check if command succeeded (exit code 0)

#
CommandStatus

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#external
pub type CommandStatus

CommandStatus - result of waiting for process

#
CommandStatus::as_any

source

#
CommandStatus::code

source
fn CommandStatus::code(self : CommandStatus) -> Int

Get exit code from CommandStatus

#
CommandStatus::signal

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fn CommandStatus::signal(self : CommandStatus) -> String?

Get signal that terminated the process (if any)

#
CommandStatus::success

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fn CommandStatus::success(self : CommandStatus) -> Bool

Check if command succeeded

#
Deno

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#external
pub type Deno

#
Deno::args

source
fn Deno::args(self : Deno) -> Array[String]

Get command line arguments

Note: The returned array is a snapshot and should be treated as immutable.

#
Deno::as_any

source
fn Deno::as_any(self : Deno) -> 
Any

#
Deno::build_arch

source
fn Deno::build_arch(self : Deno) -> String

Get architecture

#
Deno::build_os

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fn Deno::build_os(self : Deno) -> String

Get operating system

#
Deno::chmod

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async fn Deno::chmod(self : Deno, path : String, mode : Int) -> Unit

Change file permissions (Unix only)

#
Deno::connect

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async fn Deno::connect(self : Deno, hostname : String, port : Int) -> 
Any

Open a network connection (TCP)

#
Deno::copyFile

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async fn Deno::copyFile(self : Deno, from : String, to : String) -> Unit

Copy file

#
Deno::create

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async fn Deno::create(self : Deno, path : String) -> FsFile

Create a file

#
Deno::cwd

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fn Deno::cwd(self : Deno) -> String

Get current working directory

#
Deno::env_delete

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fn Deno::env_delete(self : Deno, key : String) -> Unit

Delete environment variable

#
Deno::env_get

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fn Deno::env_get(self : Deno, key : String) -> String?

Get environment variable

#
Deno::env_set

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fn Deno::env_set(self : Deno, key : String, value : String) -> Unit

Set environment variable

#
Deno::env_toObject

source
fn Deno::env_toObject(self : Deno) -> 
Any

Get all environment variables

#
Deno::exit

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fn Deno::exit(self : Deno, code? : Int) -> Unit

Exit the process

#
Deno::gid

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fn Deno::gid(self : Deno) -> Int?

Get group ID (Unix only)

#
Deno::hostname

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fn Deno::hostname(self : Deno) -> String

Get hostname

#
Deno::listen

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fn Deno::listen(self : Deno, hostname : String, port : Int) -> 
Any

Listen on a network address (TCP server)

#
Deno::loadavg

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fn Deno::loadavg(self : Deno) -> Array[Double]

Get system load average (Unix only)

Note: The returned array is a snapshot and should be treated as immutable.

#
Deno::lstat

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async fn Deno::lstat(self : Deno, path : String) -> 
Any

Check if path exists (returns null if not found instead of throwing)

#
Deno::makeTempDir

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async fn Deno::makeTempDir(self : Deno, prefix? : String) -> String

Make temporary directory

#
Deno::makeTempFile

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async fn Deno::makeTempFile(self : Deno, prefix? : String) -> String

Make temporary file

#
Deno::mkdir

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async fn Deno::mkdir(self : Deno, path : String, recursive? : Bool) -> Unit

Create directory

#
Deno::networkInterfaces

source
fn Deno::networkInterfaces(self : Deno) -> 
Any

Get network interfaces

#
Deno::now

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fn Deno::now(self : Deno) -> Double

Get high resolution time (uses performance.now())

#
Deno::open

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async fn Deno::open(self : Deno, path : String, create? : Bool, write? : Bool, read? : Bool) -> FsFile

Open a file

#
Deno::osRelease

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fn Deno::osRelease(self : Deno) -> String

Get OS release version

#
Deno::osUptime

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fn Deno::osUptime(self : Deno) -> Int

Get OS uptime in seconds

#
Deno::permissions

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fn Deno::permissions(self : Deno) -> 
Any

Get permissions object

#
Deno::permissions_query

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async fn Deno::permissions_query(self : Deno, name : String, path? : String) -> PermissionStatus

Query permission status

#
Deno::permissions_request

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async fn Deno::permissions_request(self : Deno, name : String, path? : String) -> PermissionStatus

Request permission

#
Deno::permissions_revoke

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async fn Deno::permissions_revoke(self : Deno, name : String, path? : String) -> PermissionStatus

Revoke permission

#
Deno::pid

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fn Deno::pid(self : Deno) -> Int

Get process ID

#
Deno::ppid

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fn Deno::ppid(self : Deno) -> Int

Get parent process ID

#
Deno::readDir

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fn Deno::readDir(self : Deno, path : String) -> 
Any

Read directory entries

#
Deno::readFile

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async fn Deno::readFile(self : Deno, path : String) -> 
Uint8Array

Read file as Uint8Array
async fn Deno::readLink(self : Deno, path : String) -> String

Read link target

#
Deno::readTextFile

source
async fn Deno::readTextFile(self : Deno, path : String) -> String

Read text file

#
Deno::realPath

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async fn Deno::realPath(self : Deno, path : String) -> String

Get real path (resolves symlinks)

#
Deno::remove

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async fn Deno::remove(self : Deno, path : String, recursive? : Bool) -> Unit

Remove file or directory

#
Deno::rename

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async fn Deno::rename(self : Deno, oldpath : String, newpath : String) -> Unit

Rename/move file or directory

#
Deno::resolveDns

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async fn Deno::resolveDns(self : Deno, query : String, recordType : String) -> 
Any

Resolve DNS hostname to IP addresses

#
Deno::serve

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fn Deno::serve(self : Deno, port : Int, handler : 
Any) -> 
Any

Serve HTTP requests (simplified version)

#
Deno::stat

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async fn Deno::stat(self : Deno, path : String) -> 
Any

Check if path exists

#
Deno::stderr_write

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async fn Deno::stderr_write(self : Deno, data : 
Any) -> Int

Write to stderr

#
Deno::stdin_read

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async fn Deno::stdin_read(self : Deno) -> 
Any

Read all data from stdin

#
Deno::stdout_write

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async fn Deno::stdout_write(self : Deno, data : 
Any) -> Int

Write to stdout
async fn Deno::symlink(self : Deno, target : String, path : String) -> Unit

Create symbolic link

#
Deno::systemMemoryInfo

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fn Deno::systemMemoryInfo(self : Deno) -> 
Any

Get system memory info

#
Deno::test_

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fn Deno::test_(self : Deno, name : String, f : (TestContext) -> Unit) -> Unit

Deno.test(name, fn)

#
Deno::test_async

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fn Deno::test_async(self : Deno, name : String, f : async (TestContext) -> Unit) -> Unit

Deno.test(name, async fn)

#
Deno::test_only

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fn Deno::test_only(self : Deno, name : String, f : async (TestContext) -> Unit) -> Unit

Deno.test with options (simplified - use only for testing async functions with basic options)

#
Deno::truncate

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async fn Deno::truncate(self : Deno, name : String, len : Int) -> Unit

Truncate or extend a file to specified length

#
Deno::uid

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fn Deno::uid(self : Deno) -> Int?

Get user ID (Unix only)

#
Deno::writeFile

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async fn Deno::writeFile(self : Deno, path : String, data : 
Any) -> Unit

Write file from Uint8Array or ArrayBuffer

#
Deno::writeTextFile

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async fn Deno::writeTextFile(self : Deno, path : String, data : String) -> Unit

Write text file

#
FsFile

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#external
pub type FsFile

#
FsFile::as_any

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fn FsFile::as_any(self : FsFile) -> 
Any

#
FsFile::close

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fn FsFile::close(self : FsFile) -> Unit

Close file handle

#
FsFile::read

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async fn FsFile::read(self : FsFile, buffer : 
Any) -> Int

Read from file

#
FsFile::seek

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async fn FsFile::seek(self : FsFile, offset : Int, whence : Int) -> Int

Seek file position

#
FsFile::write

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async fn FsFile::write(self : FsFile, data : 
Any) -> Int

Write to file

#
PermissionStatus

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#external
pub type PermissionStatus

#
PermissionStatus::as_any

source

#
PermissionStatus::is_granted

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fn PermissionStatus::is_granted(self : PermissionStatus) -> Bool

Check if permission is granted

#
PermissionStatus::state

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fn PermissionStatus::state(self : PermissionStatus) -> String

Get permission state ("granted", "denied", "prompt")

#
TestContext

source
#external
pub type TestContext

#
TestContext::as_any

source

#
deno

source
fn deno() -> Deno

Deno global object

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