@classic/context@0.1.2
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ngasull/classic

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•JSR Score100%•

Published7 months ago (0.1.2)

Type-safe dynamic runtime state API

Type-safe dynamic runtime state API.

Declare a key for a specific runtime type
Provide the typed data in an async closure
Retrieve data directly in user modules

Examples

End-to-end declare, provide & use summary

import { Context } from "@classic/context";
import { assert } from "@std/assert";

type User = {
  id: bigint;
  name: string;
};

// Shared code - export this key to provider and consumers
export const $user = Context.for<User>("user");

// Provider code
const john = {
  id: 42n,
  name: "John",
};

$user.provide(john, () => {
  // Consumer code - `user` is correctly typed as `User`
  assert($user.use() === john);
});

Use functions: expect context transparently in custom logic

import { Context } from "@classic/context";
import { assert } from "@std/assert";

type User = {
  id: bigint;
  name: string;
};

export const $user = Context.for<User>("user");
export const getUserId = () => $user.use().id;

// Provider code
$user.provide({ id: 42n, name: "John" }, () => {
  // Looks the same, but only exposes read access
  assert(getUserId() === 42n);
});

Safe or optional context access

import { Context } from "@classic/context";
import { assert, assertThrows } from "@std/assert";

export const $sessionId = Context.for<string>("sessionId");

assertThrows(() => $sessionId.use());
assert($sessionId.get() === undefined);

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Examples

End-to-end declare, provide & use summary

Use functions: expect context transparently in custom logic

Safe or optional context access

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@classic/context@0.1.2
Built and signed on GitHub Actions
Built and signed on GitHub Actions