Add type definitions file

package.json

@@ -3,6 +3,9 @@
 	"browser": "src/BetterSelect.js",
 	"type": "module",
 	"license": "MIT",
-	"version": "1.5.4",
-	"url": "https://darkwiiplayer.github.io/BetterSelect/"
+	"version": "1.5.5",
+	"url": "https://darkwiiplayer.github.io/BetterSelect/",
+	"scripts": {
+		"definitions": "tsc src/*.js --declaration --allowJs --emitDeclarationOnly"
+	}
 }

src/BetterSelect.d.ts

@@ -0,0 +1,100 @@
+export class BetterSelect extends HTMLElement {
+    static formAssociated: boolean;
+    static observedAttributes: readonly string[];
+    static styleSheet: CSSStyleSheet;
+    /** @type {HTMLElement} */
+    display: HTMLElement;
+    /** @type {HTMLElement} */
+    text: HTMLElement;
+    /** @type {HTMLElement} */
+    list: HTMLElement;
+    /** @type {HTMLElement} */
+    placeholder: HTMLElement;
+    /** @type {HTMLInputElement} */
+    input: HTMLInputElement;
+    /** @type {HTMLDialogElement} */
+    dialog: HTMLDialogElement;
+    /** @type {HTMLDialogElement} */
+    loading: HTMLDialogElement;
+    options: HTMLCollectionOf<HTMLOptionElement>;
+    keyboardSearchBuffer: string;
+    /**
+     * @param {String} key
+     */
+    keyboardSearchAppend(key: string): void;
+    searchTimeout: AbortController;
+    /** @param {string} search */
+    closedSearch(search: string): void;
+    open(): Promise<void>;
+    close(): void;
+    get closeSignal(): AbortSignal;
+    /** @param {String} value */
+    search(value: string): void;
+    selectDefault(): void;
+    /**
+     * @param {string} value
+     * @param {HTMLElement} item
+     */
+    match(value: string, item: HTMLElement): RegExpMatchArray;
+    connectedCallback(): void;
+    mutationCallback(): void;
+    /** @param {HTMLElement} option */
+    setOption(option: HTMLElement): void;
+    /**
+     * @param {string} value
+     * @param {string} state
+     */
+    setValue(value: string, state?: string): void;
+    set value(value: any);
+    get value(): any;
+    get valueText(): any;
+    setOptions(): void;
+    /** Changes the placeholder displayed in the display area
+     * @param {string} text
+     */
+    placeholderChanged(text: string): void;
+    /** Changes the placeholder displayed in the search box when the drop-down is open
+     * @param {string} text
+     */
+    searchPlaceholderChanged(text: string): void;
+    /**
+     * @param {String} name
+     */
+    set name(name: string);
+    /**
+     * @return {String}
+     */
+    get name(): string;
+    get form(): HTMLFormElement;
+    clear(): void;
+    /**
+     * @param {Boolean} disabled
+     */
+    set disabled(disabled: boolean);
+    get disabled(): boolean;
+    /**
+     * @param {ValidityConstraint} _constraint
+     */
+    validityMessage(_constraint: ValidityConstraint): string;
+    setValidity(): boolean;
+    checkValidity(): boolean;
+    get validity(): ValidityState;
+    get validationMessage(): string;
+    get willValidate(): boolean;
+    /**
+     * @param {Boolean} required
+     */
+    set required(required: boolean);
+    get required(): boolean;
+    reportValidity(): boolean;
+    requiredChanged(): void;
+    /**
+     * @param {String} name
+     * @param {String} before
+     * @param {String} after
+     */
+    attributeChangedCallback(name: string, before: string, after: string): void;
+    #private;
+}
+export type ValidityConstraint = "badInput" | "customError" | "patternMismatch" | "rangeOverflow" | "rangeUnderflow" | "stepMismatch" | "tooLong" | "tooShort" | "typeMismatch" | "valid" | "valueMissing";
+export type Template<Result> = ((arr: TemplateStringsArray, ...params: string[]) => Result) & ((string: string) => Result);