Convert source code to TypeScript

Author: juliolmuller

src/file-to-arraybuffer.ts

@@ -0,0 +1,71 @@
+
+function fileToArrayBuffer(target: ArrayBuffer): Promise<ArrayBuffer>
+function fileToArrayBuffer(target: Blob): Promise<ArrayBuffer>
+function fileToArrayBuffer(target: string): Promise<ArrayBuffer>
+function fileToArrayBuffer(target: HTMLInputElement): Promise<ArrayBuffer>
+function fileToArrayBuffer(target: FileList): Promise<ArrayBuffer>
+function fileToArrayBuffer(target: File): Promise<ArrayBuffer>
+
+function fileToArrayBuffer(target: any) { // eslint-disable-line @typescript-eslint/no-explicit-any
+ if (typeof Promise === 'undefined') {
+ throw new ReferenceError('Your environment does not support Promises.')
+ } else if (typeof ArrayBuffer === 'undefined') {
+ throw new ReferenceError('Your environment does not support ArrayBuffer.')
+ }
+
+ if (!target) {
+ return Promise.reject(new Error(`Empty parameter to convert to ArrayBuffer (value: '${target}').`))
+ }
+
+ if (target.constructor === ArrayBuffer) {
+ return Promise.resolve(target)
+ }
+
+ if (typeof Blob !== 'undefined' && target.constructor === Blob) {
+ return target.arrayBuffer()
+ }
+
+ let fileInputRelated = target as string | HTMLInputElement | FileList | File
+
+ if (typeof fileInputRelated === 'string') {
+ fileInputRelated = document.querySelector(fileInputRelated) as HTMLInputElement
+
+ if (!fileInputRelated) {
+ return Promise.reject(new Error(`No HTML found with selector "${target}".`))
+ }
+ }
+
+ if (typeof HTMLInputElement !== 'undefined' && fileInputRelated.constructor === HTMLInputElement) {
+ fileInputRelated = fileInputRelated.files as FileList
+
+ if (!fileInputRelated) {
+ return Promise.reject(new Error('HTML input element reference is not of type "file".'))
+ }
+ }
+
+ if (typeof FileList !== 'undefined' && fileInputRelated.constructor === FileList) {
+ fileInputRelated = fileInputRelated[0] as File
+
+ if (!fileInputRelated) {
+ return Promise.reject(new Error('Object FileList is empty.'))
+ }
+ }
+
+ if (typeof File !== 'undefined' && fileInputRelated.constructor === File) {
+ if (typeof FileReader === 'undefined') {
+ throw new TypeError('Your environment does not support FileReader.')
+ }
+
+ return fileInputRelated.arrayBuffer?.() ?? new Promise((resolve, reject) => {
+ const reader = new FileReader()
+
+ reader.onloadend = (ev) => resolve(ev.target?.result as ArrayBuffer)
+ reader.onerror = (ev) => reject(ev.target?.error)
+ reader.readAsArrayBuffer(fileInputRelated as File)
+ })
+ }
+
+ return Promise.reject(new Error('Parameter type must be an instance of HTMLInputElement, FileList, File, String (input selector), Blob or ArrayBuffer'))
+}
+
+export default fileToArrayBuffer

src/index.d.ts

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+export { default } from './file-to-arraybuffer'

src/index.js

@@ -0,0 +1,30 @@
+{
+ "compilerOptions": {
+ "rootDir": ".",
+ "baseUrl": ".",
+ "paths": {},
+ "sourceMap": false,
+ "target": "ES5",
+ "module": "esnext",
+ "lib": [
+ "DOM",
+ "ES2015.Promise"
+ ],
+ // "types": [],
+ "moduleResolution": "node",
+ "useDefineForClassFields": false,
+ "allowSyntheticDefaultImports": true,
+ "esModuleInterop": true,
+ "skipLibCheck": true, /* Skip type checking of declaration files. */
+ "declaration": false,
+ "allowJs": false,
+ "noEmit": false,
+ "strict": true,
+ "noUnusedLocals": true,
+ "resolveJsonModule": true,
+ "removeComments": false
+ },
+ "include": [
+ "src/"
+ ]
+}