fixed grain colour, added nfc page

src/web-nfc.d.ts

@@ -0,0 +1,80 @@
+// Type definitions for Web NFC
+// Project: https://github.com/w3c/web-nfc
+// Definitions by: Takefumi Yoshii <https://github.com/takefumi-yoshii>
+// TypeScript Version: 3.9
+
+// This type definitions referenced to WebIDL.
+// https://w3c.github.io/web-nfc/#actual-idl-index
+
+interface Window {
+  NDEFMessage: NDEFMessage;
+}
+declare class NDEFMessage {
+  constructor(messageInit: NDEFMessageInit);
+  records: ReadonlyArray<NDEFRecord>;
+}
+declare interface NDEFMessageInit {
+  records: NDEFRecordInit[];
+}
+
+declare type NDEFRecordDataSource = string | BufferSource | NDEFMessageInit;
+
+interface Window {
+  NDEFRecord: NDEFRecord;
+}
+declare class NDEFRecord {
+  constructor(recordInit: NDEFRecordInit);
+  readonly recordType: string;
+  readonly mediaType?: string;
+  readonly id?: string;
+  readonly data?: DataView;
+  readonly encoding?: string;
+  readonly lang?: string;
+  toRecords?: () => NDEFRecord[];
+}
+declare interface NDEFRecordInit {
+  recordType: string;
+  mediaType?: string;
+  id?: string;
+  encoding?: string;
+  lang?: string;
+  data?: NDEFRecordDataSource;
+}
+
+declare type NDEFMessageSource = string | BufferSource | NDEFMessageInit;
+
+interface Window {
+  NDEFReader: NDEFReader;
+}
+declare class NDEFReader extends EventTarget {
+  constructor();
+  onreading: (this: this, event: NDEFReadingEvent) => any;
+  onreadingerror: (this: this, error: Event) => any;
+  scan: (options?: NDEFScanOptions) => Promise<void>;
+  write: (message: NDEFMessageSource, options?: NDEFWriteOptions) => Promise<void>;
+  makeReadOnly: (options?: NDEFMakeReadOnlyOptions) => Promise<void>;
+}
+
+interface Window {
+  NDEFReadingEvent: NDEFReadingEvent;
+}
+declare class NDEFReadingEvent extends Event {
+  constructor(type: string, readingEventInitDict: NDEFReadingEventInit);
+  serialNumber: string;
+  message: NDEFMessage;
+}
+interface NDEFReadingEventInit extends EventInit {
+  serialNumber?: string;
+  message: NDEFMessageInit;
+}
+
+interface NDEFWriteOptions {
+  overwrite?: boolean;
+  signal?: AbortSignal;
+}
+interface NDEFMakeReadOnlyOptions {
+  signal?: AbortSignal;
+}
+interface NDEFScanOptions {
+  signal: AbortSignal;
+}