@langchain/langgraph
Version:
LangGraph
72 lines • 2.31 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.EphemeralValue = void 0;
const errors_js_1 = require("../errors.cjs");
const index_js_1 = require("./index.cjs");
/**
* Stores the value received in the step immediately preceding, clears after.
* @internal
*/
class EphemeralValue extends index_js_1.BaseChannel {
constructor(guard = true) {
super();
Object.defineProperty(this, "lc_graph_name", {
enumerable: true,
configurable: true,
writable: true,
value: "EphemeralValue"
});
Object.defineProperty(this, "guard", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
// 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: []
});
this.guard = guard;
}
fromCheckpoint(checkpoint) {
const empty = new EphemeralValue(this.guard);
if (typeof checkpoint !== "undefined") {
empty.value = [checkpoint];
}
return empty;
}
update(values) {
if (values.length === 0) {
const updated = this.value.length > 0;
// If there are no updates for this specific channel at the end of the step, wipe it.
this.value = [];
return updated;
}
if (values.length !== 1 && this.guard) {
throw new errors_js_1.InvalidUpdateError("EphemeralValue can only receive one value per step.");
}
// eslint-disable-next-line prefer-destructuring
this.value = [values[values.length - 1]];
return true;
}
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.EphemeralValue = EphemeralValue;
//# sourceMappingURL=ephemeral_value.js.map