pantoken / packages/utils/src / makeResolver

Function: makeResolver()

makeResolver(base, options?): (value) => string

Beta

Build a resolver that expands var(--x) references to concrete leaf values against base (plus any overrides). With mode it collapses light-dark() to that branch; without, it leaves light-dark() in place.

Parameters

base

readonly Token[]

The token set to resolve references against.

options?

ResolveOptions = {}

ResolveOptions.

Returns

A function that resolves a value string.

(value) => string

Examples

Expand a reference chain to its concrete leaf

import { makeResolver } from "@pantoken/utils";
import type { Token } from "@pantoken/model";

const ir: Token[] = [
  { name: "--instui-leaf", syntax: "<color>", inherits: true, value: "#0374B5" },
  { name: "--instui-brand", syntax: "*", inherits: true, value: "var(--instui-leaf)" },
];

const resolve = makeResolver(ir);
resolve("var(--instui-brand)"); // → "#0374B5"

Collapse light-dark() with a mode, or keep it without one

import { makeResolver } from "@pantoken/utils";
import type { Token } from "@pantoken/model";

const ir: Token[] = [
  { name: "--instui-bg", syntax: "*", inherits: true, value: "light-dark(#fff, #000)" },
];

makeResolver(ir)("var(--instui-bg)");                 // → "light-dark(#fff, #000)"
makeResolver(ir, { mode: "light" })("var(--instui-bg)"); // → "#fff"
makeResolver(ir, { mode: "dark" })("var(--instui-bg)");  // → "#000"

Layer overrides that win on name collisions

import { makeResolver } from "@pantoken/utils";
import type { Token } from "@pantoken/model";

const ir: Token[] = [
  { name: "--instui-leaf", syntax: "<color>", inherits: true, value: "#0374B5" },
  { name: "--instui-brand", syntax: "*", inherits: true, value: "var(--instui-leaf)" },
];
const overrides: Token[] = [
  { name: "--instui-leaf", syntax: "<color>", inherits: true, value: "#000" },
];

makeResolver(ir, { overrides })("var(--instui-brand)"); // → "#000"