Remove unused dependency

Author: firefoxic

lib/utils/validateTypes/index.js

@@ -1,5 +1,3 @@
-import { isPlainObject as _isPlainObject } from "is-plain-object"
-
 /**
  * Checks if the value is a boolean or a Boolean object.
  * @param {unknown} value
@@ -64,15 +62,6 @@ export function isString (value) {
 	return typeof value === `string` || value instanceof String
 }
 
-/**
- * Checks if the value is a plain object.
- * @param {unknown} value
- * @returns {value is Record<string, unknown>}
- */
-export function isPlainObject (value) {
-	return _isPlainObject(value)
-}
-
 /**
  * Assert that the value is truthy.
  * @param {unknown} value
@@ -96,15 +85,6 @@ export function assertFunction (value) {
 	console.assert(isFunction(value), `"${value}" must be a function`)
 }
 
-/**
- * Assert that the value is a number or a Number object.
- * @param {unknown} value
- * @returns {asserts value is number}
- */
-export function assertNumber (value) {
-	console.assert(isNumber(value), `"${value}" must be a number`)
-}
-
 /**
  * Assert that the value is a string or a String object.
  * @param {unknown} value

lib/utils/validateTypes/index.test.js

@@ -1,7 +1,7 @@
 import { equal } from "node:assert/strict"
 import { describe, it } from "node:test"
 
-import { isBoolean, isFunction, isNullish, isNumber, isObject, isPlainObject, isRegExp, isString } from "./index.js"
+import { isBoolean, isFunction, isNullish, isNumber, isObject, isRegExp, isString } from "./index.js"
 
 describe(`isBoolean()`, () => {
 	it(`returns true when a boolean value is specified`, () => {
@@ -92,13 +92,3 @@ describe(`isString()`, () => {
 		equal(isString(null), false)
 	})
 })
-
-describe(`isPlainObject()`, () => {
-	it(`returns true when a plain object is specified`, () => {
-		equal(isPlainObject({}), true)
-	})
-
-	it(`returns false when a plain object is not specified`, () => {
-		equal(isPlainObject(null), false)
-	})
-})

package.json

@@ -31,7 +31,6 @@
 		"@csstools/css-parser-algorithms": "^3.0.5",
 		"@csstools/css-tokenizer": "^3.0.4",
 		"@csstools/media-query-list-parser": "^4.0.3",
-		"is-plain-object": "^5.0.0",
 		"postcss": "^8.5.6",
 		"postcss-selector-parser": "^7.1.0",
 		"postcss-value-parser": "^4.2.0",