| 1 | "use strict";
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| 2 | var DagGraph_1 = require("../DagGraph");
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| 3 | var jumpToState_1 = require("./jumpToState");
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| 4 | var log = require('debug')('redux-dag-history:DagHistory');
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| 5 | function undo(history) {
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| 6 | var graph = history.graph;
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| 7 | var reader = new DagGraph_1.default(graph);
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| 8 | var parentId = reader.parentOf(reader.currentStateId);
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| 9 | if (parentId !== null && parentId !== undefined) {
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| 10 | log('undoing %s => %s', reader.currentStateId, parentId);
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| 11 | return jumpToState_1.default(parentId, history);
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| 12 | }
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| 13 | log('cannot undo');
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| 14 | return history;
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| 15 | }
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| 16 | Object.defineProperty(exports, "__esModule", { value: true });
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| 17 | exports.default = undo;
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