65 lines
1.5 KiB
TypeScript
65 lines
1.5 KiB
TypeScript
export enum MessageType {
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ACK = 0,
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TEXT = 1,
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}
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export type ServerMessage = {
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type: MessageType;
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date: number;
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};
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export function isServerMessage(
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obj: unknown,
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type?: MessageType
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): obj is ServerMessage {
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if (typeof obj !== "object") return false;
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if (obj === null) return false;
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if (
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!Object.hasOwnProperty.call(obj, "type") ||
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typeof (obj as { type: unknown }).type !== "number" ||
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(type === undefined &&
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!Object.hasOwnProperty.call(
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MessageType,
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(obj as { type: number }).type
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)) ||
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(type !== undefined && (obj as { type: number }).type !== type)
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) {
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return false;
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}
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if (
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!Object.hasOwnProperty.call(obj, "date") ||
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typeof (obj as { date: unknown }).date !== "number"
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) {
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return false;
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}
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return true;
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}
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export type TextMessage = ServerMessage & {
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type: MessageType.TEXT;
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author: number;
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content: string;
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};
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export function isTextMessage(obj: unknown): obj is TextMessage {
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if (!isServerMessage(obj, MessageType.TEXT)) return false;
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if (
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!Object.hasOwnProperty.call(obj, "author") ||
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typeof (obj as ServerMessage & { author: unknown }).author !== "number"
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) {
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return false;
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}
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if (
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!Object.hasOwnProperty.call(obj, "author") ||
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typeof (obj as ServerMessage & { content: unknown }).content !== "string"
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) {
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return false;
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}
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return true;
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}
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export type AckMessage = ServerMessage & {
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type: MessageType.ACK;
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};
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export function isAckMessage(obj: unknown): obj is AckMessage {
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return isServerMessage(obj, MessageType.ACK);
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}
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