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{"version":3,"file":"index.cjs","sources":["../src/errors.ts","../src/parse.ts"],"sourcesContent":["/**\n * The type of error that occurred.\n * @public\n */\nexport type ErrorType = 'invalid-retry' | 'unknown-field'\n\n/**\n * Error thrown when encountering an issue during parsing.\n *\n * @public\n */\nexport class ParseError extends Error {\n /**\n * The type of error that occurred.\n */\n type: ErrorType\n\n /**\n * In the case of an unknown field encountered in the stream, this will be the field name.\n */\n field?: string | undefined\n\n /**\n * In the case of an unknown field encountered in the stream, this will be the value of the field.\n */\n value?: string | undefined\n\n /**\n * The line that caused the error, if available.\n */\n line?: string | undefined\n\n constructor(\n message: string,\n options: {type: ErrorType; field?: string; value?: string; line?: string},\n ) {\n super(message)\n this.name = 'ParseError'\n this.type = options.type\n this.field = options.field\n this.value = options.value\n this.line = options.line\n }\n}\n","/**\n * EventSource/Server-Sent Events parser\n * @see https://html.spec.whatwg.org/multipage/server-sent-events.html\n */\nimport {ParseError} from './errors.ts'\nimport type {EventSourceParser, ParserCallbacks} from './types.ts'\n\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nfunction noop(_arg: unknown) {\n // intentional noop\n}\n\n/**\n * Creates a new EventSource parser.\n *\n * @param callbacks - Callbacks to invoke on different parsing events:\n * - `onEvent` when a new event is parsed\n * - `onError` when an error occurs\n * - `onRetry` when a new reconnection interval has been sent from the server\n * - `onComment` when a comment is encountered in the stream\n *\n * @returns A new EventSource parser, with `parse` and `reset` methods.\n * @public\n */\nexport function createParser(callbacks: ParserCallbacks): EventSourceParser {\n if (typeof callbacks === 'function') {\n throw new TypeError(\n '`callbacks` must be an object, got a function instead. Did you mean `{onEvent: fn}`?',\n )\n }\n\n const {onEvent = noop, onError = noop, onRetry = noop, onComment} = callbacks\n\n let incompleteLine = ''\n\n let isFirstChunk = true\n let id: string | undefined\n let data = ''\n let eventType = ''\n\n function feed(newChunk: string) {\n // Strip any UTF8 byte order mark (BOM) at the start of the stream\n const chunk = isFirstChunk ? newChunk.replace(/^\\xEF\\xBB\\xBF/, '') : newChunk\n\n // If there was a previous incomplete line, append it to the new chunk,\n // so we may process it together as a new (hopefully complete) chunk.\n const [complete, incomplete] = splitLines(`${incompleteLine}${chunk}`)\n\n for (const line of complete) {\n parseLine(line)\n }\n\n incompleteLine = incomplete\n isFirstChunk = false\n }\n\n function parseLine(line: string) {\n // If the line is empty (a blank line), dispatch the event\n if (line === '') {\n dispatchEvent()\n return\n }\n\n // If the line starts with a U+003A COLON character (:), ignore the line.\n if (line.startsWith(':')) {\n if (onComment) {\n onComment(line.slice(line.startsWith(': ') ? 2 : 1))\n }\n return\n }\n\n // If the line contains a U+003A COLON character (:)\n const fieldSeparatorIndex = line.indexOf(':')\n if (fieldSeparatorIndex !== -1) {\n // Collect the characters on the line before the first U+003A COLON character (:),\n // and let `field` be that string.\n const field = line.slice(0, fieldSeparatorIndex)\n\n // Collect the characters on the line after the first U+003A COLON character (:),\n // and let `value` be that string. If value starts with a U+0020 SPACE character,\n // remove it from value.\n const offset = line[fieldSeparatorIndex + 1] === ' ' ? 2 : 1\n const value = line.slice(fieldSeparatorIndex + offset)\n\n processField(field, value, line)\n return\n }\n\n // O
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