Node CLI Utilities

A few common utilities for Node CLI applications

Table of Content

• Table of Content
• Installation
• API
  • lowerFirst
  • fastMerge
  • uniqueID
  • upperFirst
• License

Installation

> cd your-project
> npm install --save-dev @node-cli/utilities

API

lowerFirst

lowerFirst(text: string) ⇒ string

Transform the first letter of the provided string to lowercase (but not all the words).

import { lowerFirst } from "@node-cli/utilities";
const str = lowerFirst("HELLO WORLD");
// str is "hELLO WORLD"

fastMerge

fastMerge(objA: object, objB: object, customizer: () => void) ⇒ object

Wrapper method for lodash merge() and mergeWith() methods.

Without the customizer function, this method recursively merges own and inherited enumerable string keyed properties of source objects into the destination object. Source properties that resolve to undefined are skipped if a destination value exists. Array and plain object properties are merged recursively. Other objects and value types are overridden by assignment. Source objects are applied from left to right. Subsequent sources overwrite property assignments of previous sources.

With the customizer function, the behavior is the same except that customizer is invoked to produce the merged values of the destination and source properties. If customizer returns undefined, merging is handled by the fastMerge instead. The customizer is invoked with six arguments: (objValue, srcValue, key, object, source, stack)

WARNING: this method will mutate objA!

import { fastMerge } from "@node-cli/utilities";

const objA = { port: 123, cache: false, gzip: true };
const objB = { port: 456, gzip: false };
const objC = fastMerge(objA, objB);

// objC is { port: 456, cache: false, gzip: false };

import { isArray } from "lodash-es";
import { fastMerge } from "@node-cli/utilities";

const objA = { a: [1], b: [2] };
const objB = { a: [3], b: [4] };
const objC = fastMerge(objA, objB, (objValue, srcValue) => {
	if (isArray(objValue)) {
		return objValue.concat(srcValue);
	}
});

// objC is { 'a': [1, 3], 'b': [2, 4] };

uniqueID

uniqueID(prefix?: string = "") ⇒ string

Generate a unique ID.

import { uniqueID } from "@node-cli/utilities";
const id = uniqueID("my-prefix-");
// id is something like "my-prefix-5f3a2b3c-1a2b-3c4d-5e6f-7a8b9c0d1e2f"

upperFirst

upperFirst(text: string) ⇒ string

Capitalize the first letter of the provided string (but not all the words).

import { upperFirst } from "@node-cli/utilities";
const str = upperFirst("hello world");
// str is "Hello world"

License

MIT © Arno Versini