@mapomodule/utils

Pure TypeScript utility helpers shared across all @mapomodule/* packages. No Vue, no Nuxt, no side effects — safe to import from any context including server-only code and tests.

Installation

pnpm add @mapomodule/utils

---

normalizeEndpoint(endpoint)

Ensures an API endpoint path has exactly one leading slash and one trailing slash. Query strings (anything after ?) are preserved unchanged — the slash is inserted before the ?, never after it. Used internally by useCrud to normalize user-provided paths.

import { normalizeEndpoint } from "@mapomodule/utils";

normalizeEndpoint("api/articles"); // '/api/articles/'
normalizeEndpoint("/api/articles"); // '/api/articles/'
normalizeEndpoint("/api/articles/"); // '/api/articles/'
normalizeEndpoint("///api/articles"); // '/api/articles/'
normalizeEndpoint("/api/articles?fields=id"); // '/api/articles/?fields=id'
normalizeEndpoint("/api/articles/?ordering=-date"); // '/api/articles/?ordering=-date'

---

splitEndpointParams(endpoint)

Splits an endpoint string into its clean path and the parsed query params. Useful when an endpoint carries baked-in params (e.g. ?fields=id,title) that must be merged into request params while CRUD mutations target the bare path. Used by MapoListTable to keep the list endpoint and mutation endpoints in sync.

import { splitEndpointParams } from "@mapomodule/utils";

splitEndpointParams("/api/articles/?fields=id,title");
// → { path: '/api/articles/', params: { fields: 'id,title' } }

splitEndpointParams("/api/articles/");
// → { path: '/api/articles/', params: {} }

---

deepMerge(target, source)

Recursively merges two plain objects. Arrays and primitives in source overwrite those in target; nested objects are merged recursively.

import { deepMerge } from "@mapomodule/utils";

deepMerge({ a: 1, b: { c: 2 } }, { b: { d: 3 } });
// → { a: 1, b: { c: 2, d: 3 } }

---

getNestedValue(obj, path) / setNestedValue(obj, path, value)

Read or write a value at a dotted path string.

import { getNestedValue, setNestedValue } from "@mapomodule/utils";

const obj = { user: { address: { city: "Rome" } } };

getNestedValue(obj, "user.address.city"); // 'Rome'
setNestedValue(obj, "user.address.city", "Milan");
// → { user: { address: { city: 'Milan' } } }

---

objectDiff(original, updated)

Returns only the keys whose values differ between two objects. Used by useCrud.partialUpdate to send minimal PATCH payloads.

import { objectDiff } from "@mapomodule/utils";

objectDiff({ title: "Old", body: "Text" }, { title: "New", body: "Text" });
// → { title: 'New' }

Arrays are compared by content (deep recursive equality), not by reference. This means a cloned array with identical elements is treated as unchanged — which prevents false-positive isDirty flags when the form baseline is built from deepClone(model).

---

formatDate(date, format?)

Formats a Date object or ISO string using a token-based format string.

Token	Value
YYYY	4-digit year
MM	2-digit month
DD	2-digit day
HH	2-digit hours (24h)
mm	2-digit minutes
ss	2-digit seconds

import { formatDate } from "@mapomodule/utils";

formatDate(new Date("2026-04-28T10:30:00"), "YYYY-MM-DD"); // '2026-04-28'
formatDate("2026-04-28T10:30:00", "DD/MM/YYYY HH:mm"); // '28/04/2026 10:30'

---

debounce(fn, delay)

Returns a debounced version of fn that delays invocation until delay ms have elapsed since the last call.

import { debounce } from "@mapomodule/utils";

const onSearch = debounce((query: string) => fetchResults(query), 300);

---

slotNamespace(slots, prefix)

Filters a Vue Slots object to only those whose names start with prefix, and strips the prefix from each key. Used to forward a slot subset to a child component.

import { slotNamespace } from "@mapomodule/utils";

// Parent has slots: 'header', 'list:empty', 'list:item'
const listSlots = slotNamespace(slots, "list:");
// → { empty: ..., item: ... }

---

buildRouteTree(routes)

Converts a flat RouteRecordNormalized[] array into a nested MenuNode[] tree, using route.meta.parent to establish parent–child relationships. Used by the sidebar to build the navigation tree.

import { buildRouteTree } from "@mapomodule/utils";
import type { MenuNode } from "@mapomodule/utils";

const tree: MenuNode[] = buildRouteTree(router.getRoutes());

---

calcMaxMenuNestDepth(nodes)

Returns the maximum nesting depth of a MenuNode[] tree. Root level = 1.

import { calcMaxMenuNestDepth } from "@mapomodule/utils";

calcMaxMenuNestDepth([]); // 0
calcMaxMenuNestDepth([{ children: [] }]); // 1
calcMaxMenuNestDepth([{ children: [{ children: [] }] }]); // 2

---

deepClone(value)

Deep-clones plain objects and arrays. Does not handle class instances, Maps, Sets, or circular references.

import { deepClone } from "@mapomodule/utils";

const copy = deepClone({ user: { name: "Alice", tags: ["admin"] } });
copy.user.tags.push("editor");
// original is unchanged

---

isFile(value) / isBlob(value) / isFileOrBlob(value)

Type-safe guards for File and Blob instances. Safe to call server-side (returns false if the global is unavailable).

import { isFile, isBlob, isFileOrBlob } from "@mapomodule/utils";

isFile(new File([], "doc.pdf")); // true
isBlob(new Blob(["data"])); // true
isFileOrBlob(42); // false

---

findPropPaths(obj, predicate)

Returns all dot-notation paths in obj where predicate(value) is truthy.

import { findPropPaths, isFile } from "@mapomodule/utils";

const obj = { title: "Hello", meta: { thumb: new File([], "img.png") } };
findPropPaths(obj, isFile); // ["meta.thumb"]

---

filesInObject(obj)

Shorthand for findPropPaths(obj, isFileOrBlob). Returns paths of all File / Blob values — used internally by useCrud multipart detection.

import { filesInObject } from "@mapomodule/utils";

filesInObject({ title: "Doc", file: new File([], "a.pdf") }); // ["file"]

---

filterObj(obj, keys)

Returns a shallow copy of obj containing only the specified top-level keys.

import { filterObj } from "@mapomodule/utils";

filterObj({ a: 1, b: 2, c: 3 }, ["a", "c"]); // { a: 1, c: 3 }