39 lines
1.2 KiB
TypeScript
39 lines
1.2 KiB
TypeScript
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export type ParsedSseFrame =
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| { kind: 'event'; event: string; data: Record<string, unknown>; id?: string }
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| { kind: 'comment'; comment: string }
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| { kind: 'empty' };
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export function parseSseFrame(frame: string): ParsedSseFrame | null {
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const lines = frame.split('\n');
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const comments: string[] = [];
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let event = 'message';
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let id: string | undefined;
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const dataLines: string[] = [];
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for (const rawLine of lines) {
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const line = rawLine.endsWith('\r') ? rawLine.slice(0, -1) : rawLine;
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if (line.startsWith(':')) {
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comments.push(line.slice(1).trimStart());
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} else if (line.startsWith('event: ')) {
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event = line.slice(7).trim();
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} else if (line.startsWith('id: ')) {
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id = line.slice(4).trim();
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} else if (line.startsWith('data: ')) {
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dataLines.push(line.slice(6));
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}
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}
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if (dataLines.length === 0) {
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if (comments.length > 0) {
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return { kind: 'comment', comment: comments.join('\n') };
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}
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return { kind: 'empty' };
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}
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try {
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return { kind: 'event', event, data: JSON.parse(dataLines.join('\n')), ...(id ? { id } : {}) };
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} catch {
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return null;
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}
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}
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