Agent skill

east-node-std

Node.js platform functions for the East language. Use when writing East programs that need Console I/O, FileSystem operations, HTTP Fetch requests, Cryptography, Time operations, Path manipulation, Random number generation, or Testing. Triggers for: (1) Writing East programs with @elaraai/east-node-std, (2) Using platform functions like Console.log, FileSystem.readFile, Fetch.get, Crypto.uuid, Time.now, Path.join, Random.normal, (3) Testing East code with describeEast and Assert.

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npx add-skill https://github.com/elaraai/east-plugin/tree/main/skills/east-node-std

SKILL.md

East Node Standard Library

Node.js platform functions for the East language. Enables East programs to interact with the filesystem, network, console, and other I/O operations.

Quick Start

typescript
import { East, StringType, NullType } from "@elaraai/east";
import { NodePlatform, Console, FileSystem } from "@elaraai/east-node-std";

const processFile = East.function(
    [StringType],
    NullType,
    ($, path) => {
        const content = $.let(FileSystem.readFile(path));
        $(Console.log(content));
    }
);

// Compile with NodePlatform (includes all platform functions)
const compiled = East.compile(processFile.toIR(), NodePlatform);
await compiled("input.txt");

Decision Tree: Which Module to Use

Task → What do you need?
    │
    ├─ Console (stdout/stderr output)
    │   └─ .log(), .error(), .write()
    │
    ├─ FileSystem (read/write files and directories)
    │   ├─ Text → .readFile(), .writeFile(), .appendFile()
    │   ├─ Binary → .readFileBytes(), .writeFileBytes()
    │   ├─ Query → .exists(), .isFile(), .isDirectory()
    │   ├─ Directory → .createDirectory(), .readDirectory()
    │   └─ Delete → .deleteFile()
    │
    ├─ Fetch (HTTP requests)
    │   └─ .get(), .getBytes(), .post(), .request()
    │
    ├─ Crypto (hashing, UUIDs, random bytes)
    │   └─ .uuid(), .randomBytes(), .hashSha256(), .hashSha256Bytes()
    │
    ├─ Time (timestamps and delays)
    │   └─ .now(), .sleep()
    │
    ├─ Path (path manipulation)
    │   └─ .join(), .resolve(), .dirname(), .basename(), .extname()
    │
    ├─ Random (statistical distributions)
    │   ├─ Basic → .uniform(), .normal(), .range()
    │   ├─ Continuous → .exponential(), .weibull(), .pareto(), .logNormal()
    │   ├─ Discrete → .bernoulli(), .binomial(), .geometric(), .poisson()
    │   ├─ Composite → .irwinHall(), .bates()
    │   └─ Control → .seed()
    │
    └─ Assert (testing with describeEast)
        └─ .is(), .equal(), .notEqual(), .less(), .lessEqual(), .greater(), .greaterEqual(), .between(), .throws(), .fail()

Compiling East Programs

Option 1: Use NodePlatform (all modules)

typescript
const compiled = East.compile(myFunction.toIR(), NodePlatform);

Option 2: Use specific module implementations

typescript
const compiled = East.compile(myFunction.toIR(), [...Console.Implementation, ...FileSystem.Implementation]);

Reference Documentation

  • API Reference - Complete function signatures, types, and arguments for all modules
  • Examples - Working code examples by use case

Available Modules

Module Import Purpose
Console import { Console } from "@elaraai/east-node-std" stdout/stderr output
FileSystem import { FileSystem } from "@elaraai/east-node-std" Read/write files and directories
Fetch import { Fetch } from "@elaraai/east-node-std" HTTP requests
Crypto import { Crypto } from "@elaraai/east-node-std" Hashing, UUIDs, random bytes
Time import { Time } from "@elaraai/east-node-std" Timestamps and sleep
Path import { Path } from "@elaraai/east-node-std" Path manipulation
Random import { Random } from "@elaraai/east-node-std" 14 statistical distributions
Assert import { Assert, describeEast } from "@elaraai/east-node-std" Testing utilities

Accessing Types

typescript
import { Fetch } from "@elaraai/east-node-std";

// Access types via Module.Types.TypeName
const method = Fetch.Types.Method;
const config = Fetch.Types.RequestConfig;
const response = Fetch.Types.Response;

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