https://github.com/cmd-johnson/deno-reflect-metadata

A Deno-compatible copy of the TypeScript Metadata Reflection API my Microsoft
https://github.com/cmd-johnson/deno-reflect-metadata

deno reflect-metadata typescript

Last synced: 3 months ago
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A Deno-compatible copy of the TypeScript Metadata Reflection API my Microsoft

• Host: GitHub
• URL: https://github.com/cmd-johnson/deno-reflect-metadata
• Owner: cmd-johnson
• License: apache-2.0
• Created: 2020-10-14T07:33:29.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2022-06-24T11:20:10.000Z (over 2 years ago)
• Last Synced: 2024-09-17T15:17:40.200Z (3 months ago)
• Topics: deno, reflect-metadata, typescript
• Language: TypeScript
• Homepage:
• Size: 31.3 KB
• Stars: 11
• Watchers: 4
• Forks: 4
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Metadata Reflection API for Deno

This is a direct copy of the [Metadata Reflection API by Microsoft](https://github.com/rbuckton/reflect-metadata) with [slight changes](https://github.com/cmd-johnson/deno-reflect-metadata/commit/a39666813eb7e8b38fe563f275085b60f044af7e) to make it usable in Deno.

Check out the [Source Repository](https://github.com/rbuckton/reflect-metadata) for more details.

## Example usage

```ts

import { Reflect } from "https://deno.land/x/[email protected]/mod.ts";

// deno-lint-ignore no-explicit-any

type Constructor = new (...args: any[]) => T;

function decorator(_: Constructor): void {}

@decorator

class Example {

  constructor(a: string, b: number, c: Example) {}

}

console.log(Reflect.getMetadata("design:paramtypes", Example));

// "[ [Function: String], [Function: Number], [Function: Example] ]"

```

The decorator is required for the TypeScript compiler to generate metadata for the Example class.

If you don't put a decorator on the Example class, the call to `getMetadata` will return `undefined`.

> Remember to always add a `tsconfig.json` file with the following content and running your code using `deno run -c tsconfig.json your_code.ts` or decorators and reflection will not work!

```json

{

  "compilerOptions": {

    "experimentalDecorators": true,

    "emitDecoratorMetadata": true

  }

}

```