---

name: east-node-std description: "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."

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

Copyimport { 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

CopyTask → 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(), .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)

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

Option 2: Use specific module implementations

Copyconst 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

Accessing Types

Copyimport { 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;