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import TextLineStream from 'textlinestream';
import {
APIMessage,
APIMessageContentPart,
LlamaCppServerProps,
Message,
} from './types';
// ponyfill for missing ReadableStream asyncIterator on Safari
import { asyncIterator } from '@sec-ant/readable-stream/ponyfill/asyncIterator';
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export const isString = (x: any) => !!x.toLowerCase;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export const isBoolean = (x: any) => x === true || x === false;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export const isNumeric = (n: any) => !isString(n) && !isNaN(n) && !isBoolean(n);
export const escapeAttr = (str: string) =>
str.replace(/>/g, '>').replace(/"/g, '"');
// wrapper for SSE
export async function* getSSEStreamAsync(fetchResponse: Response) {
if (!fetchResponse.body) throw new Error('Response body is empty');
const lines: ReadableStream<string> = fetchResponse.body
.pipeThrough(new TextDecoderStream())
.pipeThrough(new TextLineStream());
// @ts-expect-error asyncIterator complains about type, but it should work
for await (const line of asyncIterator(lines)) {
//if (isDev) console.log({ line });
if (line.startsWith('data:') && !line.endsWith('[DONE]')) {
const data = JSON.parse(line.slice(5));
yield data;
} else if (line.startsWith('error:')) {
const data = JSON.parse(line.slice(6));
throw new Error(data.message || 'Unknown error');
}
}
}
// copy text to clipboard
export const copyStr = (textToCopy: string) => {
// Navigator clipboard api needs a secure context (https)
if (navigator.clipboard && window.isSecureContext) {
navigator.clipboard.writeText(textToCopy);
} else {
// Use the 'out of viewport hidden text area' trick
const textArea = document.createElement('textarea');
textArea.value = textToCopy;
// Move textarea out of the viewport so it's not visible
textArea.style.position = 'absolute';
textArea.style.left = '-999999px';
document.body.prepend(textArea);
textArea.select();
document.execCommand('copy');
}
};
/**
* filter out redundant fields upon sending to API
* also format extra into text
*/
export function normalizeMsgsForAPI(messages: Readonly<Message[]>) {
return messages.map((msg) => {
if (msg.role !== 'user' || !msg.extra) {
return {
role: msg.role,
content: msg.content,
} as APIMessage;
}
// extra content first, then user text message in the end
// this allow re-using the same cache prefix for long context
const contentArr: APIMessageContentPart[] = [];
for (const extra of msg.extra ?? []) {
if (extra.type === 'context') {
contentArr.push({
type: 'text',
text: extra.content,
});
} else if (extra.type === 'textFile') {
contentArr.push({
type: 'text',
text: `File: ${extra.name}\nContent:\n\n${extra.content}`,
});
} else if (extra.type === 'imageFile') {
contentArr.push({
type: 'image_url',
image_url: { url: extra.base64Url },
});
} else if (extra.type === 'audioFile') {
contentArr.push({
type: 'input_audio',
input_audio: {
data: extra.base64Data,
format: /wav/.test(extra.mimeType) ? 'wav' : 'mp3',
},
});
} else {
throw new Error('Unknown extra type');
}
}
// add user message to the end
contentArr.push({
type: 'text',
text: msg.content,
});
return {
role: msg.role,
content: contentArr,
};
}) as APIMessage[];
}
/**
* recommended for DeepsSeek-R1, filter out content between <think> and </think> tags
*/
export function filterThoughtFromMsgs(messages: APIMessage[]) {
console.debug({ messages });
return messages.map((msg) => {
if (msg.role !== 'assistant') {
return msg;
}
// assistant message is always a string
const contentStr = msg.content as string;
return {
role: msg.role,
content:
msg.role === 'assistant'
? contentStr.split('</think>').at(-1)!.trim()
: contentStr,
} as APIMessage;
});
}
export function classNames(classes: Record<string, boolean>): string {
return Object.entries(classes)
.filter(([_, value]) => value)
.map(([key, _]) => key)
.join(' ');
}
export const delay = (ms: number) =>
new Promise((resolve) => setTimeout(resolve, ms));
export const throttle = <T extends unknown[]>(
callback: (...args: T) => void,
delay: number
) => {
let isWaiting = false;
return (...args: T) => {
if (isWaiting) {
return;
}
callback(...args);
isWaiting = true;
setTimeout(() => {
isWaiting = false;
}, delay);
};
};
export const cleanCurrentUrl = (removeQueryParams: string[]) => {
const url = new URL(window.location.href);
removeQueryParams.forEach((param) => {
url.searchParams.delete(param);
});
window.history.replaceState({}, '', url.toString());
};
export const getServerProps = async (
baseUrl: string,
apiKey?: string
): Promise<LlamaCppServerProps> => {
try {
const response = await fetch(`${baseUrl}/props`, {
headers: {
'Content-Type': 'application/json',
...(apiKey ? { Authorization: `Bearer ${apiKey}` } : {}),
},
});
if (!response.ok) {
throw new Error('Failed to fetch server props');
}
const data = await response.json();
return data as LlamaCppServerProps;
} catch (error) {
console.error('Error fetching server props:', error);
throw error;
}
};
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