@thi.ng/associative/internal/inspect.js

ES Map/Set-compatible implementations with customizable equality semantics & supporting operations

import { mixin } from "@thi.ng/api/mixin";
import { isNode } from "@thi.ng/checks/is-node";
import { map } from "@thi.ng/transducers/map";
let inspect = null;
isNode() && import("util").then((m) => {
  inspect = m.inspect;
});
const __inspectSet = (coll, opts) => [...map((x) => inspect(x, opts), coll)].join(", ");
const __inspectMap = (coll, opts) => [
  ...map(
    ([k, v]) => `${inspect(k, opts)} => ${inspect(v, opts)}`,
    coll
  )
].join(", ");
const __inspectable = mixin({
  [Symbol.for("nodejs.util.inspect.custom")](depth, opts) {
    const name = this[Symbol.toStringTag];
    const childOpts = {
      ...opts,
      depth: opts.depth === null ? null : opts.depth - 1
    };
    return depth >= 0 ? [
      `${name}(${this.size || 0}) {`,
      inspect ? this instanceof Set ? __inspectSet(this, childOpts) : this instanceof Map ? __inspectMap(this, childOpts) : "" : "",
      "}"
    ].join(" ") : opts.stylize(`[${name}]`, "special");
  }
});
export {
  __inspectable
};