Angius Posts

Angius

•Created by Angius on 3/14/2025 in #help

`ts-match` unable to infer types properly

I'm using the ts-match library to do some pattern matching on an object, and it seems unable to infer most types properly. Perhaps someone has experience with it. My code is https://pastie.io/htxtti.ts and I'm seeing errors left, right, and center. * 1: Type 'unknown' is not assignable to type '[typeString: string | undefined, skipImport: boolean]' * 9:

Object literal may only specify known properties, and 'enum' does not exist in type 'Matcher<never, unknown, any, any, unknown>'

* 10: Property 'enum' does not exist on type 'never' * 10: Parameter 'e' implicitly has an 'any' type * 13:

Object literal may only specify known properties, and 'oneOf' does not exist in type 'Matcher<never, unknown, any, any, unknown>'

* 15: Property 'oneOf' does not exist on type 'never' * 24:

Object literal may only specify known properties, and 'properties' does not exist in type 'Matcher<never, unknown, any, any, unknown>

* 26: Property 'properties' does not exist on type 'never' * 27: Argument of type 'unknown' is not assignable to parameter of type 'Type' * 35:

Object literal may only specify known properties, and 'type' does not exist in type 'Matcher<never, unknown, any, any, unknown>'

* 36: Property 'type' does not exist on type 'never' For reference, the type I'm matching on is

export interface Type {
    type: string;
    enum?: string[] | undefined;
    format?: string | undefined;
    nullable?: boolean | undefined;
    properties?: Record<string, Type> | undefined;
    items: Type;
    oneOf?: Type[] | undefined;
    $ref?: string | undefined;
}

export interface Type {
    type: string;
    enum?: string[] | undefined;
    format?: string | undefined;
    nullable?: boolean | undefined;
    properties?: Record<string, Type> | undefined;
    items: Type;
    oneOf?: Type[] | undefined;
    $ref?: string | undefined;
}

2 replies

DDeno

•Created by Angius on 7/30/2024 in #help

Typing `parseArgs` from `@std/cli` properly

I'm having trouble figuring out how would I type the result of parseArgs with collect setting.

import { parseArgs } from "@std/cli";

const args = parseArgs(Deno.args, { collect: ["path"] });

generatePaths(params[0].toString(), args["path"]);
                                    ^^^^^^^^^^^^

import { parseArgs } from "@std/cli";

const args = parseArgs(Deno.args, { collect: ["path"] });

generatePaths(params[0].toString(), args["path"]);
                                    ^^^^^^^^^^^^

the error is caused by the function taking a { [key: string] string } as the second parameter, while args[path] is typed as unknown[]. The code works, just so we're clear, it's just the types that error out.

2 replies