docs: add types declaration file

lib/index.d.ts

@@ -0,0 +1,70 @@
+declare module 'split-type' {
+  type SplitTypeOptions = {
+    absolute: boolean
+    tagName: string
+    lineClass: string
+    wordClass: string
+    charClass: string
+    splitClass: string
+    types: string
+    split: string
+  }
+
+  export default class SplitType {
+    /**
+     * An array of the split line elements in the splitType instance
+     */
+    lines: HTMLElement[] | null
+
+    /**
+     * An array of the split word elements in the splitType instance
+     */
+    words: HTMLElement[] | null
+
+    /**
+     * An array of the split character elements
+     */
+    chars: HTMLElement[] | null
+
+    /**
+     * Get the default settings for all SplitType calls, or set new ones.
+     *
+     * If setting: the value should be object containing specific settings to
+     * override. The value will be merged with the existing defaults object.
+     */
+    static defaults: Partial<SplitTypeOptions>
+
+    /**
+     * Creates a new `SplitType` instance
+     *
+     * @param target The target elements to split. can be one of:
+     *  - {string} A css selector
+     *  - {HTMLElement} A single element
+     *  - {ArrayLike<HTMLElement>} A collection of elements
+     *  - {Array<HTMLElement | ArrayLike<HTMLElement>>} A nested array of elements
+     * @param [options] Settings for the SplitType instance
+     */
+    constructor(
+      target:
+        | string
+        | HTMLElement
+        | ArrayLike<HTMLElement>
+        | Array<HTMLElement | ArrayLike<HTMLElement>>,
+      options?: Partial<SplitTypeOptions>
+    )
+
+    /**
+     * Splits the text in all target elements. This method is called
+     * automatically when a new SplitType instance is created. It can also be
+     * called manually to re-split text with new options.
+     * @param options
+     */
+    split(options: Partial<SplitTypeOptions>): void
+
+    /**
+     * Restores target elements to their original text content. It also clears
+     * cached data associated with the split text nodes.
+     */
+    revert(): void
+  }
+}

package.json

@@ -3,6 +3,7 @@
   "version": "0.2.2",
   "description": "A javascript library that splits plain text into individual lines, words, and characters.",
   "main": "dist/index.js",
+  "types": "lib/index.d.ts",
   "unpkg": "umd/index.min.js",
   "files": [
     "umd/*.{js,ts}",