diff --git a/src/analysis/timeline/params.js b/src/analysis/timeline/params.js
index a3f2819..aa845e4 100644
--- a/src/analysis/timeline/params.js
+++ b/src/analysis/timeline/params.js
@@ -6,7 +6,7 @@ import {
   toJSON as weightsToJSON,
   fromJSON as weightsFromJSON,
   defaultWeights,
-} from "../weights";
+} from "../../core/weights";
 
 /**
  * Parameters for computing TimelineCred
diff --git a/src/analysis/timeline/params.test.js b/src/analysis/timeline/params.test.js
index ddf3745..823f8e1 100644
--- a/src/analysis/timeline/params.test.js
+++ b/src/analysis/timeline/params.test.js
@@ -9,7 +9,7 @@ import {
   DEFAULT_ALPHA,
   DEFAULT_INTERVAL_DECAY,
 } from "./params";
-import {defaultWeights} from "../weights";
+import {defaultWeights} from "../../core/weights";
 import {NodeAddress} from "../../core/graph";
 
 describe("analysis/timeline/params", () => {
diff --git a/src/analysis/timeline/timelinePagerank.js b/src/analysis/timeline/timelinePagerank.js
index 754bc55..ba3f00f 100644
--- a/src/analysis/timeline/timelinePagerank.js
+++ b/src/analysis/timeline/timelinePagerank.js
@@ -8,7 +8,7 @@ import {sum} from "d3-array";
 import * as NullUtil from "../../util/null";
 import {Graph, type NodeAddressT, type Edge, type Node} from "../../core/graph";
 import {type NodeAndEdgeTypes} from "../types";
-import {type Weights} from "../weights";
+import {type Weights} from "../../core/weights";
 import {type Interval, partitionGraph} from "./interval";
 import {
   nodeWeightEvaluator,
diff --git a/src/analysis/types.js b/src/analysis/types.js
index a6ced9c..44de457 100644
--- a/src/analysis/types.js
+++ b/src/analysis/types.js
@@ -1,7 +1,7 @@
 // @flow
 
 import {type NodeAddressT, type EdgeAddressT} from "../core/graph";
-import {type EdgeWeight} from "./weights";
+import {type EdgeWeight} from "../core/weights";
 
 /**
  * This module defines `NodeType`s and `EdgeType`s, both of which are
diff --git a/src/analysis/weightEvaluator.js b/src/analysis/weightEvaluator.js
index 028f166..81d80c6 100644
--- a/src/analysis/weightEvaluator.js
+++ b/src/analysis/weightEvaluator.js
@@ -2,8 +2,12 @@
 
 import type {NodeAddressT, EdgeAddressT} from "../core/graph";
 import type {NodeType, EdgeType} from "./types";
-import type {Weights as WeightsT, EdgeWeight, NodeWeight} from "./weights";
-import * as Weights from "./weights";
+import type {
+  Weights as WeightsT,
+  EdgeWeight,
+  NodeWeight,
+} from "../core/weights";
+import * as Weights from "../core/weights";
 import {NodeTrie, EdgeTrie} from "../core/trie";
 
 export type NodeWeightEvaluator = (NodeAddressT) => NodeWeight;
diff --git a/src/analysis/weightEvaluator.test.js b/src/analysis/weightEvaluator.test.js
index f5fdd34..1b96b96 100644
--- a/src/analysis/weightEvaluator.test.js
+++ b/src/analysis/weightEvaluator.test.js
@@ -3,7 +3,7 @@
 import deepFreeze from "deep-freeze";
 import {NodeAddress, EdgeAddress} from "../core/graph";
 import {nodeWeightEvaluator, edgeWeightEvaluator} from "./weightEvaluator";
-import {defaultWeights} from "./weights";
+import {defaultWeights} from "../core/weights";
 
 describe("src/analysis/weightEvaluator", () => {
   describe("nodeWeightEvaluator", () => {
diff --git a/src/analysis/weightsToEdgeEvaluator.js b/src/analysis/weightsToEdgeEvaluator.js
index c6171a6..88b0db8 100644
--- a/src/analysis/weightsToEdgeEvaluator.js
+++ b/src/analysis/weightsToEdgeEvaluator.js
@@ -2,7 +2,7 @@
 
 import type {Edge} from "../core/graph";
 import type {NodeAndEdgeTypes} from "./types";
-import type {Weights} from "./weights";
+import type {Weights} from "../core/weights";
 import type {EdgeEvaluator} from "./pagerank";
 import {nodeWeightEvaluator, edgeWeightEvaluator} from "./weightEvaluator";
 
diff --git a/src/analysis/weightsToEdgeEvaluator.test.js b/src/analysis/weightsToEdgeEvaluator.test.js
index 96a0d76..4dda738 100644
--- a/src/analysis/weightsToEdgeEvaluator.test.js
+++ b/src/analysis/weightsToEdgeEvaluator.test.js
@@ -2,7 +2,7 @@
 
 import deepFreeze from "deep-freeze";
 import {NodeAddress, EdgeAddress} from "../core/graph";
-import {type Weights, defaultWeights} from "./weights";
+import {type Weights, defaultWeights} from "../core/weights";
 import {weightsToEdgeEvaluator} from "./weightsToEdgeEvaluator";
 
 describe("analysis/weightsToEdgeEvaluator", () => {
diff --git a/src/api/load.test.js b/src/api/load.test.js
index e38989c..fe8f85e 100644
--- a/src/api/load.test.js
+++ b/src/api/load.test.js
@@ -16,7 +16,7 @@ import {
   loadProject,
 } from "../core/project_io";
 import {makeRepoId} from "../plugins/github/repoId";
-import {defaultWeights} from "../analysis/weights";
+import {defaultWeights} from "../core/weights";
 import {NodeAddress, Graph} from "../core/graph";
 import {node} from "../core/graphTestUtil";
 import {TestTaskReporter} from "../util/taskReporter";
diff --git a/src/cli/common.js b/src/cli/common.js
index 35aecc3..67cae17 100644
--- a/src/cli/common.js
+++ b/src/cli/common.js
@@ -5,7 +5,7 @@ import os from "os";
 import path from "path";
 import deepFreeze from "deep-freeze";
 import fs from "fs-extra";
-import {type Weights, fromJSON as weightsFromJSON} from "../analysis/weights";
+import {type Weights, fromJSON as weightsFromJSON} from "../core/weights";
 import {validateToken, type GithubToken} from "../plugins/github/token";
 
 export type PluginName = "git" | "github";
diff --git a/src/cli/common.test.js b/src/cli/common.test.js
index 617958e..de61643 100644
--- a/src/cli/common.test.js
+++ b/src/cli/common.test.js
@@ -3,7 +3,7 @@
 import path from "path";
 import tmp from "tmp";
 import fs from "fs-extra";
-import {defaultWeights, toJSON as weightsToJSON} from "../analysis/weights";
+import {defaultWeights, toJSON as weightsToJSON} from "../core/weights";
 import {NodeAddress} from "../core/graph";
 import {validateToken} from "../plugins/github/token";
 
diff --git a/src/cli/discourse.js b/src/cli/discourse.js
index e305491..14827b5 100644
--- a/src/cli/discourse.js
+++ b/src/cli/discourse.js
@@ -7,7 +7,7 @@ import dedent from "../util/dedent";
 import {LoggingTaskReporter} from "../util/taskReporter";
 import type {Command} from "./command";
 import * as Common from "./common";
-import {defaultWeights} from "../analysis/weights";
+import {defaultWeights} from "../core/weights";
 import {load} from "../api/load";
 import {declaration as discourseDeclaration} from "../plugins/discourse/declaration";
 import {type Project, createProject} from "../core/project";
diff --git a/src/cli/load.js b/src/cli/load.js
index 9a8c2e9..c218696 100644
--- a/src/cli/load.js
+++ b/src/cli/load.js
@@ -5,7 +5,7 @@ import dedent from "../util/dedent";
 import {LoggingTaskReporter} from "../util/taskReporter";
 import type {Command} from "./command";
 import * as Common from "./common";
-import {defaultWeights, fromJSON as weightsFromJSON} from "../analysis/weights";
+import {defaultWeights, fromJSON as weightsFromJSON} from "../core/weights";
 import {projectFromJSON} from "../core/project";
 import {load} from "../api/load";
 import {specToProject} from "../plugins/github/specToProject";
diff --git a/src/cli/load.test.js b/src/cli/load.test.js
index 10cd54d..a6b1033 100644
--- a/src/cli/load.test.js
+++ b/src/cli/load.test.js
@@ -8,7 +8,7 @@ import {NodeAddress} from "../core/graph";
 import {run} from "./testUtil";
 import loadCommand, {help} from "./load";
 import type {LoadOptions} from "../api/load";
-import {defaultWeights, toJSON as weightsToJSON} from "../analysis/weights";
+import {defaultWeights, toJSON as weightsToJSON} from "../core/weights";
 import * as Common from "./common";
 import {defaultParams, partialParams} from "../analysis/timeline/params";
 import {declaration as githubDeclaration} from "../plugins/github/declaration";
diff --git a/src/analysis/weights.js b/src/core/weights.js
similarity index 100%
rename from src/analysis/weights.js
rename to src/core/weights.js
diff --git a/src/analysis/weights.test.js b/src/core/weights.test.js
similarity index 98%
rename from src/analysis/weights.test.js
rename to src/core/weights.test.js
index 446e86d..7164c62 100644
--- a/src/analysis/weights.test.js
+++ b/src/core/weights.test.js
@@ -4,7 +4,7 @@ import stringify from "json-stable-stringify";
 import {NodeAddress, EdgeAddress} from "../core/graph";
 import {toJSON, fromJSON, defaultWeights, copy} from "./weights";
 
-describe("analysis/weights", () => {
+describe("core/weights", () => {
   it("copy makes a copy", () => {
     const w = defaultWeights();
     const w1 = copy(w);
diff --git a/src/explorer/TimelineExplorer.js b/src/explorer/TimelineExplorer.js
index b1d68bf..7870690 100644
--- a/src/explorer/TimelineExplorer.js
+++ b/src/explorer/TimelineExplorer.js
@@ -2,7 +2,7 @@
 
 import React from "react";
 import deepEqual from "lodash.isequal";
-import {type Weights, copy as weightsCopy} from "../analysis/weights";
+import {type Weights, copy as weightsCopy} from "../core/weights";
 import {type NodeAddressT} from "../core/graph";
 import {TimelineCred} from "../analysis/timeline/timelineCred";
 import {type TimelineCredParameters} from "../analysis/timeline/params";
diff --git a/src/explorer/legacy/App.js b/src/explorer/legacy/App.js
index e5aef20..08f81df 100644
--- a/src/explorer/legacy/App.js
+++ b/src/explorer/legacy/App.js
@@ -12,7 +12,7 @@ import {type NodeAddressT} from "../../core/graph";
 import {PagerankTable} from "./pagerankTable/Table";
 import {WeightConfig} from "../weights/WeightConfig";
 import {WeightsFileManager} from "../weights/WeightsFileManager";
-import {type Weights, defaultWeights} from "../../analysis/weights";
+import {type Weights, defaultWeights} from "../../core/weights";
 import {Prefix as GithubPrefix} from "../../plugins/github/nodes";
 import {
   createStateTransitionMachine,
diff --git a/src/explorer/legacy/state.js b/src/explorer/legacy/state.js
index b222435..6a435c3 100644
--- a/src/explorer/legacy/state.js
+++ b/src/explorer/legacy/state.js
@@ -13,7 +13,7 @@ import {
 } from "../../analysis/pagerank";
 import {TimelineCred} from "../../analysis/timeline/timelineCred";
 
-import type {Weights} from "../../analysis/weights";
+import type {Weights} from "../../core/weights";
 import {weightsToEdgeEvaluator} from "../../analysis/weightsToEdgeEvaluator";
 import {combineTypes} from "../../analysis/pluginDeclaration";
 
diff --git a/src/explorer/legacy/state.test.js b/src/explorer/legacy/state.test.js
index 6a3b82e..922f171 100644
--- a/src/explorer/legacy/state.test.js
+++ b/src/explorer/legacy/state.test.js
@@ -5,7 +5,7 @@ import {StateTransitionMachine, type AppState} from "./state";
 import {Graph, NodeAddress} from "../../core/graph";
 import {Assets} from "../../webutil/assets";
 import {type EdgeEvaluator} from "../../analysis/pagerank";
-import {defaultWeights} from "../../analysis/weights";
+import {defaultWeights} from "../../core/weights";
 import type {
   PagerankNodeDecomposition,
   PagerankOptions,
diff --git a/src/explorer/weights/EdgeTypeConfig.js b/src/explorer/weights/EdgeTypeConfig.js
index 117fb2a..e2bde00 100644
--- a/src/explorer/weights/EdgeTypeConfig.js
+++ b/src/explorer/weights/EdgeTypeConfig.js
@@ -4,7 +4,7 @@ import React from "react";
 import {WeightSlider, type Props as WeightSliderProps} from "./WeightSlider";
 
 import type {EdgeType} from "../../analysis/types";
-import type {EdgeWeight} from "../../analysis/weights";
+import type {EdgeWeight} from "../../core/weights";
 
 export class EdgeTypeConfig extends React.Component<{
   +weight: EdgeWeight,
diff --git a/src/explorer/weights/NodeTypeConfig.js b/src/explorer/weights/NodeTypeConfig.js
index 1e32ff4..8905256 100644
--- a/src/explorer/weights/NodeTypeConfig.js
+++ b/src/explorer/weights/NodeTypeConfig.js
@@ -3,7 +3,7 @@
 import React from "react";
 import {WeightSlider} from "./WeightSlider";
 import type {NodeType} from "../../analysis/types";
-import type {NodeWeight} from "../../analysis/weights";
+import type {NodeWeight} from "../../core/weights";
 
 export class NodeTypeConfig extends React.Component<{
   +weight: NodeWeight,
diff --git a/src/explorer/weights/WeightConfig.js b/src/explorer/weights/WeightConfig.js
index a99cabc..06750e8 100644
--- a/src/explorer/weights/WeightConfig.js
+++ b/src/explorer/weights/WeightConfig.js
@@ -4,7 +4,7 @@ import React from "react";
 import * as NullUtil from "../../util/null";
 
 import {type NodeAddressT, type EdgeAddressT} from "../../core/graph";
-import {type EdgeWeight, type NodeWeight} from "../../analysis/weights";
+import {type EdgeWeight, type NodeWeight} from "../../core/weights";
 import {type NodeType, type EdgeType} from "../../analysis/types";
 import type {PluginDeclaration} from "../../analysis/pluginDeclaration";
 import {NodeTypeConfig} from "./NodeTypeConfig";
diff --git a/src/explorer/weights/WeightsFileManager.js b/src/explorer/weights/WeightsFileManager.js
index f1b766b..bada889 100644
--- a/src/explorer/weights/WeightsFileManager.js
+++ b/src/explorer/weights/WeightsFileManager.js
@@ -5,7 +5,7 @@ import React from "react";
 import {FileUploader} from "../../util/FileUploader";
 import Link from "../../webutil/Link";
 import {MdFileDownload, MdFileUpload} from "react-icons/md";
-import {type Weights, toJSON, fromJSON} from "../../analysis/weights";
+import {type Weights, toJSON, fromJSON} from "../../core/weights";
 
 export type Props = {|
   +weights: Weights,