@lyleunderwood/filereader-polyfill/dist/index.mjs.map

W3C File API specification compliant FileReader polyfill for Node.js environments

{
  "version": 3,
  "sources": ["../src/File.ts", "../src/FileReader.ts", "../src/index.ts"],
  "sourcesContent": ["import { statSync } from 'fs';\nimport { basename } from 'path';\nimport { BlobPart, FilePropertyBag, IFile, NodeFile } from './types';\n\nexport class File extends Blob implements NodeFile {\n  public readonly name: string;\n  public readonly lastModified: number;\n  private _path?: string;\n\n  constructor(fileBits: BlobPart[], fileName: string, options?: FilePropertyBag);\n  constructor(filePath: string);\n  constructor(\n    fileBitsOrPath: BlobPart[] | string,\n    fileName?: string,\n    options?: FilePropertyBag\n  ) {\n    if (typeof fileBitsOrPath === 'string') {\n      // File path constructor - defer file system access\n      const filePath = fileBitsOrPath;\n      \n      super([], { type: '' }); // Will be overridden by file content\n      this.name = basename(filePath);\n      this.lastModified = Date.now(); // Will be updated when file is accessed\n      this._path = filePath;\n    } else {\n      // Standard Web API constructor\n      super(fileBitsOrPath as any, options);\n      this.name = fileName || '';\n      this.lastModified = options?.lastModified ?? Date.now();\n    }\n  }\n\n  get path(): string | undefined {\n    return this._path;\n  }\n\n  // Helper method to get file stats and update lastModified\n  private async _getFileStats(): Promise<any> {\n    if (!this._path) return null;\n    \n    try {\n      const { stat } = await import('fs/promises');\n      const stats = await stat(this._path);\n      // Update lastModified with actual file time (mutating readonly property)\n      (this as any).lastModified = stats.mtime.getTime();\n      return stats;\n    } catch (error) {\n      throw new DOMException(`Failed to read file: ${error}`, 'NotReadableError');\n    }\n  }\n\n  // Override arrayBuffer to read from file if path is available\n  async arrayBuffer(): Promise<ArrayBuffer> {\n    if (this._path) {\n      await this._getFileStats(); // This will throw DOMException if file doesn't exist\n      try {\n        const { readFile } = await import('fs/promises');\n        const buffer = await readFile(this._path);\n        return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);\n      } catch (error) {\n        throw new DOMException(`Failed to read file: ${error}`, 'NotReadableError');\n      }\n    }\n    return super.arrayBuffer();\n  }\n\n  // Override stream to read from file if path is available\n  stream(): ReadableStream<Uint8Array> {\n    if (this._path) {\n      const filePath = this._path;\n      const self = this;\n      \n      return new ReadableStream({\n        async start(controller) {\n          try {\n            await self._getFileStats(); // This will throw DOMException if file doesn't exist\n            const { createReadStream } = require('fs');\n            const nodeStream = createReadStream(filePath);\n            \n            nodeStream.on('data', (chunk: Buffer) => {\n              controller.enqueue(new Uint8Array(chunk));\n            });\n            \n            nodeStream.on('end', () => {\n              controller.close();\n            });\n            \n            nodeStream.on('error', (error: any) => {\n              controller.error(new DOMException(`Failed to read file: ${error}`, 'NotReadableError'));\n            });\n          } catch (error) {\n            controller.error(error);\n          }\n        },\n        \n        cancel() {\n          // Stream will be cleaned up automatically\n        }\n      });\n    }\n    return super.stream();\n  }\n\n  // Override text to read from file if path is available\n  async text(): Promise<string> {\n    if (this._path) {\n      await this._getFileStats(); // This will throw DOMException if file doesn't exist\n      try {\n        const { readFile } = await import('fs/promises');\n        return readFile(this._path, 'utf8');\n      } catch (error) {\n        throw new DOMException(`Failed to read file: ${error}`, 'NotReadableError');\n      }\n    }\n    return super.text();\n  }\n}", "import { IFileReader, FileReaderState, EventHandler, ProgressEvent } from './types';\n\nexport class FileReader extends EventTarget implements IFileReader {\n  // ReadyState constants (W3C spec compliant)\n  static readonly EMPTY = 0 as const;\n  static readonly LOADING = 1 as const;\n  static readonly DONE = 2 as const;\n\n  // Instance constants (required by W3C spec)\n  public readonly EMPTY = 0 as const;\n  public readonly LOADING = 1 as const;\n  public readonly DONE = 2 as const;\n\n  // Instance properties (readonly per W3C spec, but mutable internally)\n  public error: DOMException | null = null;\n  public readyState: FileReaderState = FileReader.EMPTY;\n  public result: string | ArrayBuffer | null = null;\n\n  // Event handlers (W3C spec compliant)\n  public onabort: EventHandler = null;\n  public onerror: EventHandler = null;\n  public onload: EventHandler = null;\n  public onloadend: EventHandler = null;\n  public onloadstart: EventHandler = null;\n  public onprogress: EventHandler = null;\n\n  private _abortController: AbortController | null = null;\n\n  constructor() {\n    super();\n  }\n\n  // Read methods\n  readAsArrayBuffer(blob: Blob): void {\n    this._read(blob, 'arrayBuffer');\n  }\n\n  readAsText(blob: Blob, encoding = 'utf-8'): void {\n    this._read(blob, 'text', encoding);\n  }\n\n  readAsDataURL(blob: Blob): void {\n    this._read(blob, 'dataURL');\n  }\n\n  readAsBinaryString(blob: Blob): void {\n    this._read(blob, 'binaryString');\n  }\n\n  abort(): void {\n    if (this.readyState !== FileReader.LOADING) {\n      return;\n    }\n\n    this.readyState = FileReader.DONE;\n    this.result = null;\n    this.error = new DOMException('The operation was aborted.', 'AbortError');\n\n    if (this._abortController) {\n      this._abortController.abort();\n    }\n\n    this._fireEvent('abort');\n    this._fireEvent('loadend');\n  }\n\n  private _read(blob: Blob, format: string, encoding?: string): void {\n    if (this.readyState === FileReader.LOADING) {\n      throw new DOMException('The FileReader is already loading.', 'InvalidStateError');\n    }\n\n    this._performRead(blob, format, encoding);\n  }\n\n  private async _performRead(blob: Blob, format: string, encoding?: string): Promise<void> {\n\n    this.readyState = FileReader.LOADING;\n    this.result = null;\n    this.error = null;\n    this._abortController = new AbortController();\n\n    this._fireEvent('loadstart');\n\n    try {\n      let totalSize = blob.size;\n      let loadedSize = 0;\n\n      // Use stream-based reading for progress events\n      const reader = blob.stream().getReader();\n      const chunks: Uint8Array[] = [];\n\n      try {\n        while (true) {\n          const { done, value } = await reader.read();\n          \n          if (this._abortController.signal.aborted) {\n            return; // Abort was called\n          }\n\n          if (done) break;\n\n          chunks.push(value);\n          loadedSize += value.length;\n\n          // Fire progress event (W3C spec compliant)\n          const progressEvent = new Event('progress') as ProgressEvent;\n          (progressEvent as any).lengthComputable = totalSize > 0;  \n          (progressEvent as any).loaded = loadedSize;\n          (progressEvent as any).total = totalSize;\n          this._fireProgressEvent(progressEvent);\n        }\n      } finally {\n        reader.releaseLock();\n      }\n\n      if (this._abortController.signal.aborted) {\n        return; // Abort was called during reading\n      }\n\n      // Combine all chunks\n      const totalLength = chunks.reduce((sum, chunk) => sum + chunk.length, 0);\n      const combined = new Uint8Array(totalLength);\n      let offset = 0;\n      for (const chunk of chunks) {\n        combined.set(chunk, offset);\n        offset += chunk.length;\n      }\n\n      // Format the result based on the requested format\n      switch (format) {\n        case 'arrayBuffer':\n          this.result = combined.buffer.slice(combined.byteOffset, combined.byteOffset + combined.byteLength);\n          break;\n        case 'text':\n          this.result = new TextDecoder(encoding).decode(combined);\n          break;\n        case 'dataURL':\n          const base64 = Buffer.from(combined).toString('base64');\n          this.result = `data:${blob.type || 'application/octet-stream'};base64,${base64}`;\n          break;\n        case 'binaryString':\n          this.result = Buffer.from(combined).toString('latin1');\n          break;\n      }\n\n      this.readyState = FileReader.DONE;\n      this._fireEvent('load');\n      this._fireEvent('loadend');\n\n    } catch (error) {\n      if (this._abortController.signal.aborted) {\n        return; // Abort was called\n      }\n\n      this.readyState = FileReader.DONE;\n      this.error = error instanceof DOMException ? error : new DOMException(String(error), 'NotReadableError');\n      this.result = null;\n\n      this._fireEvent('error');\n      this._fireEvent('loadend');\n    }\n  }\n\n  private _fireEvent(type: string): void {\n    const event = new Event(type);\n    this.dispatchEvent(event);\n\n    // Also call the corresponding handler if set\n    const handler = (this as any)[`on${type}`];\n    if (typeof handler === 'function') {\n      handler.call(this, event);\n    }\n  }\n\n  private _fireProgressEvent(event: ProgressEvent): void {\n    this.dispatchEvent(event);\n\n    if (typeof this.onprogress === 'function') {\n      this.onprogress.call(this, event);\n    }\n  }\n}", "import { File as FilePolyfill } from './File';\nimport { FileReader as FileReaderPolyfill } from './FileReader';\n\nexport { FilePolyfill as File, FileReaderPolyfill as FileReader };\n\n// Export W3C spec compliant types\nexport type {\n  BlobPart,\n  FilePropertyBag,\n  EventHandler,\n  ProgressEvent,\n  IFileReader,\n  IFile,\n  NodeFile,\n  FileReaderState\n} from './types';\n\n// Polyfill globals if they don't exist\nif (typeof global !== 'undefined') {\n  if (!(global as any).FileReader) {\n    (global as any).FileReader = FileReaderPolyfill;\n  }\n  if (!(global as any).File) {\n    (global as any).File = FilePolyfill;\n  }\n}"],
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}