diff --git a/ts/graphs/card-counts.ts b/ts/graphs/card-counts.ts
index 7451466c1..f45bca720 100644
--- a/ts/graphs/card-counts.ts
+++ b/ts/graphs/card-counts.ts
@@ -197,7 +197,7 @@ export function renderCards(
 
     x.range([bounds.marginLeft, bounds.width - bounds.marginRight]);
 
-    const tableData = (data as any).flatMap((d: SummedDatum, idx: number) => {
+    const tableData = data.flatMap((d: SummedDatum, idx: number) => {
         const percent = ((d.count / xMax) * 100).toFixed(1);
         return d.show
             ? ({
diff --git a/ts/graphs/intervals.ts b/ts/graphs/intervals.ts
index 613c809a8..c37363fe2 100644
--- a/ts/graphs/intervals.ts
+++ b/ts/graphs/intervals.ts
@@ -108,9 +108,7 @@ export function prepareIntervalData(
 
     const bins = histogram()
         .domain(scale.domain() as [number, number])
-        .thresholds((scale.ticks(desiredBars) as any).flatMap(adjustTicks))(
-        allIntervals
-    );
+        .thresholds(scale.ticks(desiredBars).flatMap(adjustTicks))(allIntervals);
 
     // empty graph?
     const totalInPeriod = sum(bins, (bin) => bin.length);
diff --git a/ts/tsconfig.json b/ts/tsconfig.json
index e359b52a0..c53d47021 100644
--- a/ts/tsconfig.json
+++ b/ts/tsconfig.json
@@ -3,7 +3,7 @@
     "compilerOptions": {
         "target": "es6",
         "module": "es6",
-        "lib": ["es2016", "dom"],
+        "lib": ["es2016", "es2019.array", "dom"],
         "baseUrl": ".",
         "paths": {
             "anki/*": ["../bazel-bin/ts/lib/*"]