Yui•2y ago

module augmentation

Suppose module.ts is some external module that I have no control of. In my file test.ts I want to change the type UserEnv of the external module. How can I do this or does Deno just not support this and you basically need to use node to do this? Note: This is a simple example where I could technically use generics, but you cannot do that with bigger stuff.

7 Replies

YuiOP•2y ago

module.ts

import type { Interaction } from "https://deno.land/x/discordeno@17.2.0/mod.ts";

// deno-lint-ignore no-empty-interface
interface UserEnv {}

export type CommandExecutor = (data: UserEnv) => void | Promise<void>;
export type Command = () => CommandExecutor;

export const tool = {
  // deno-lint-ignore no-unused-vars
  create: (data: Interaction): UserEnv => {
    return {};
  },
};

import type { Interaction } from "https://deno.land/x/discordeno@17.2.0/mod.ts";

// deno-lint-ignore no-empty-interface
interface UserEnv {}

export type CommandExecutor = (data: UserEnv) => void | Promise<void>;
export type Command = () => CommandExecutor;

export const tool = {
  // deno-lint-ignore no-unused-vars
  create: (data: Interaction): UserEnv => {
    return {};
  },
};

test.ts

import type { Interaction } from "https://deno.land/x/discordeno@17.2.0/mod.ts";
import { CommandExecutor, tool } from "./module.ts";

declare module "./module.ts" {
  interface UserEnv {
    data: Interaction;
    appname: string;
  }
}

tool.create = (data) => {
  return { data, appname: "test" };
};

// deno-lint-ignore no-unused-vars
function testcommand(): CommandExecutor {


    
  return (data) => {
    // deno-lint-ignore no-unused-vars
    const interaction = data.data;

    // deno-lint-ignore no-unused-vars
    const appname = data.appname;
  };
}

import type { Interaction } from "https://deno.land/x/discordeno@17.2.0/mod.ts";
import { CommandExecutor, tool } from "./module.ts";

declare module "./module.ts" {
  interface UserEnv {
    data: Interaction;
    appname: string;
  }
}

tool.create = (data) => {
  return { data, appname: "test" };
};

// deno-lint-ignore no-unused-vars
function testcommand(): CommandExecutor {


    
  return (data) => {
    // deno-lint-ignore no-unused-vars
    const interaction = data.data;

    // deno-lint-ignore no-unused-vars
    const appname = data.appname;
  };
}

Unknown User•2y ago

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YuiOP•2y ago

yeah, seems like Deno does not support it.

Unknown User•2y ago

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YuiOP•2y ago

If I turn off typechecking than yeah. (no --check flag)

Unknown User•2y ago

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YuiOP•2y ago

module augmentation stuff not working 😐