@langchain/langgraph
Version:
LangGraph
65 lines • 1.94 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.AnyValue = void 0;
const errors_js_1 = require("../errors.cjs");
const base_js_1 = require("./base.cjs");
/**
* Stores the last value received, assumes that if multiple values are received, they are all equal.
*
* Note: Unlike 'LastValue' if multiple nodes write to this channel in a single step, the values
* will be continuously overwritten.
*
* @internal
*/
class AnyValue extends base_js_1.BaseChannel {
constructor() {
super();
Object.defineProperty(this, "lc_graph_name", {
enumerable: true,
configurable: true,
writable: true,
value: "AnyValue"
});
// value is an array so we don't misinterpret an update to undefined as no write
Object.defineProperty(this, "value", {
enumerable: true,
configurable: true,
writable: true,
value: []
});
}
fromCheckpoint(checkpoint) {
const empty = new AnyValue();
if (typeof checkpoint !== "undefined") {
empty.value = [checkpoint];
}
return empty;
}
update(values) {
if (values.length === 0) {
const updated = this.value.length > 0;
this.value = [];
return updated;
}
// eslint-disable-next-line prefer-destructuring
this.value = [values[values.length - 1]];
return false;
}
get() {
if (this.value.length === 0) {
throw new errors_js_1.EmptyChannelError();
}
return this.value[0];
}
checkpoint() {
if (this.value.length === 0) {
throw new errors_js_1.EmptyChannelError();
}
return this.value[0];
}
isAvailable() {
return this.value.length !== 0;
}
}
exports.AnyValue = AnyValue;
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