speechflow
Version:
Speech Processing Flow Graph
145 lines • 5.99 kB
JavaScript
;
/*
** SpeechFlow - Speech Processing Flow Graph
** Copyright (c) 2024-2025 Dr. Ralf S. Engelschall <rse@engelschall.com>
** Licensed under GPL 3.0 <https://spdx.org/licenses/GPL-3.0-only>
*/
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var __importDefault = (this && this.__importDefault) || function (mod) {
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};
Object.defineProperty(exports, "__esModule", { value: true });
/* standard dependencies */
const node_stream_1 = __importDefault(require("node:stream"));
/* external dependencies */
const DeepL = __importStar(require("deepl-node"));
/* internal dependencies */
const speechflow_node_1 = __importDefault(require("./speechflow-node"));
const util = __importStar(require("./speechflow-util"));
/* SpeechFlow node for DeepL text-to-text translations */
class SpeechFlowNodeT2TDeepL extends speechflow_node_1.default {
/* declare official node name */
static name = "t2t-deepl";
/* internal state */
deepl = null;
/* construct node */
constructor(id, cfg, opts, args) {
super(id, cfg, opts, args);
/* declare node configuration parameters */
this.configure({
key: { type: "string", val: process.env.SPEECHFLOW_DEEPL_KEY ?? "" },
src: { type: "string", pos: 0, val: "de", match: /^(?:de|en|fr|it)$/ },
dst: { type: "string", pos: 1, val: "en", match: /^(?:de|en|fr|it)$/ },
optimize: { type: "string", pos: 2, val: "latency", match: /^(?:latency|quality)$/ }
});
/* validate API key */
if (this.params.key === "")
throw new Error("DeepL API key is required");
/* sanity check situation */
if (this.params.src === this.params.dst)
throw new Error("source and destination languages cannot be the same");
/* declare node input/output format */
this.input = "text";
this.output = "text";
}
/* one-time status of node */
async status() {
const deepl = new DeepL.Translator(this.params.key);
const usage = await deepl.getUsage();
const limit = usage?.character?.limit ?? 1;
const percent = limit > 0 ? ((usage?.character?.count ?? 0) / limit * 100) : 0;
return { usage: `${percent.toFixed(8)}%` };
}
/* open node */
async open() {
/* instantiate DeepL API SDK */
this.deepl = new DeepL.Translator(this.params.key);
/* provide text-to-text translation */
const translate = async (text) => {
const src = this.params.src === "en" ? "en-US" : this.params.src;
const dst = this.params.dst === "en" ? "en-US" : this.params.dst;
const result = await this.deepl.translateText(text, src, dst, {
splitSentences: "off",
modelType: this.params.optimize === "latency" ?
"latency_optimized" : "prefer_quality_optimized",
preserveFormatting: true,
formality: "prefer_more"
});
return (result?.text ?? text);
};
/* establish a duplex stream and connect it to DeepL translation */
this.stream = new node_stream_1.default.Transform({
readableObjectMode: true,
writableObjectMode: true,
decodeStrings: false,
highWaterMark: 1,
transform(chunk, encoding, callback) {
if (Buffer.isBuffer(chunk.payload))
callback(new Error("invalid chunk payload type"));
else if (chunk.payload === "") {
this.push(chunk);
callback();
}
else {
translate(chunk.payload).then((payload) => {
const chunkNew = chunk.clone();
chunkNew.payload = payload;
this.push(chunkNew);
callback();
}).catch((error) => {
callback(util.ensureError(error));
});
}
},
final(callback) {
this.push(null);
callback();
}
});
}
/* close node */
async close() {
/* close stream */
if (this.stream !== null) {
this.stream.destroy();
this.stream = null;
}
/* shutdown DeepL API */
if (this.deepl !== null)
this.deepl = null;
}
}
exports.default = SpeechFlowNodeT2TDeepL;
//# sourceMappingURL=speechflow-node-t2t-deepl.js.map