diff --git a/.eslintrc b/.eslintrc
index 55b719926..cc67d8767 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -54,6 +54,7 @@
         }
       }
     ],
+    "typescript-eslint/no-unnecessary-type-assertion": "off",
     "unicorn/consistent-destructuring": "off",
     "unicorn/new-for-builtins": "off",
     "unicorn/prevent-abbreviations": "off",
diff --git a/src/aesthetics/Aesthetic.ts b/src/aesthetics/Aesthetic.ts
index 8a8edc1de..63c2a24a1 100644
--- a/src/aesthetics/Aesthetic.ts
+++ b/src/aesthetics/Aesthetic.ts
@@ -1,7 +1,5 @@
 import type { TextureSet } from './AestheticSet';
-import {
-  isConstantChannel,
-} from '../typing';
+import { isConstantChannel } from '../typing';
 import { Type, Vector } from 'apache-arrow';
 import { StructRowProxy } from 'apache-arrow/row/struct';
 import { isNumber } from 'lodash';
@@ -22,7 +20,7 @@ import { Scatterplot } from '../scatterplot';
 export abstract class Aesthetic<
   ChannelType extends DS.ChannelType,
   Input extends DS.InType = DS.NumberIn,
-  Output extends DS.OutType = DS.NumberOut
+  Output extends DS.OutType = DS.NumberOut,
 > {
   public abstract default_constant: Output['rangeType'];
   public abstract default_range: [Output['rangeType'], Output['rangeType']];
@@ -31,8 +29,8 @@ export abstract class Aesthetic<
   public _texture_buffer: Float32Array | Uint8Array | null = null;
   protected abstract _func?: (d: Input['domainType']) => Output['rangeType'];
   public aesthetic_map: TextureSet;
-  public column : Vector<Input['arrowType']> | null;
-  
+  public column: Vector<Input['arrowType']> | null = null;
+
   // cache of the d3 scale
   public encoding: ChannelType;
   public id: string;
@@ -40,15 +38,14 @@ export abstract class Aesthetic<
     encoding: ChannelType | null,
     scatterplot: Scatterplot,
     aesthetic_map: TextureSet,
-    id: string
+    id: string,
   ) {
     this.aesthetic_map = aesthetic_map;
     if (this.aesthetic_map === undefined) {
-
       throw new Error('Aesthetic map is undefined');
     }
     if (typeof this.aesthetic_map === 'function') {
-      throw new Error("WTF")
+      throw new Error('WTF');
     }
     this.scatterplot = scatterplot;
 
@@ -57,7 +54,7 @@ export abstract class Aesthetic<
 
     if (encoding === undefined) {
       throw new Error(
-        'Updates with undefined should be handled upstream of the aesthetic.'
+        'Updates with undefined should be handled upstream of the aesthetic.',
       );
     }
 
@@ -68,7 +65,7 @@ export abstract class Aesthetic<
 
     if (isNumber(encoding)) {
       throw new Error(
-        `As of deepscatter 3.0, you must pass {constant: ${encoding}}, not just "${encoding}`
+        `As of deepscatter 3.0, you must pass {constant: ${encoding}}, not just "${encoding}`,
       );
     }
 
@@ -86,17 +83,17 @@ export abstract class Aesthetic<
   }
 
   abstract apply(point: Datum): Output['rangeType'];
-  
+
   abstract toGLType(val: Output['rangeType']): Output['glType'];
 
   get webGLDomain() {
-    console.log("No method for webGLDomain")
-    return [0, 1] as [number, number]
+    console.log('No method for webGLDomain');
+    return [0, 1] as [number, number];
   }
   default_data(): Uint8Array | Float32Array | Array<number> {
     const default_value = this.toGLType(this.default_constant);
     return Array(this.aesthetic_map.texture_size).fill(
-      default_value
+      default_value,
     ) as Array<number>;
   }
 
@@ -118,7 +115,7 @@ export abstract class Aesthetic<
     return this.aesthetic_map.get_position(this.id);
   }
 
-  get texture_buffer() : Uint8Array {
+  get texture_buffer(): Uint8Array {
     if (this._texture_buffer) {
       return this._texture_buffer as Uint8Array;
     }
@@ -133,14 +130,14 @@ export abstract class Aesthetic<
 
   arrow_column(): Vector<Input['arrowType']> | null {
     if (this.column) {
-      return this.column
+      return this.column;
     }
     if (this.field === null || this.field === undefined) {
-      return this.column = null;
+      return (this.column = null);
     }
-    return this.column = this.dataset.root_tile.record_batch.getChild(this.field) as Vector<
-      Input['arrowType']
-    >;
+    return (this.column = this.dataset.root_tile.record_batch.getChild(
+      this.field,
+    ) as Vector<Input['arrowType']>);
   }
 
   is_dictionary(): boolean {
diff --git a/src/interaction.ts b/src/interaction.ts
index a6c09066d..9a975b788 100644
--- a/src/interaction.ts
+++ b/src/interaction.ts
@@ -1,4 +1,6 @@
 /* eslint-disable no-underscore-dangle */
+/* eslint-disable @typescript-eslint/unbound-method */
+
 import { select } from 'd3-selection';
 import { timer } from 'd3-timer';
 import { D3ZoomEvent, zoom, zoomIdentity } from 'd3-zoom';
@@ -78,7 +80,6 @@ export class Zoom {
       .translate(width / 2, height / 2)
       .scale(k)
       .translate(-scales.x(x), -scales.y(y));
-
     canvas.transition().duration(duration).call(zoomer.transform, t);
   }
 
@@ -102,9 +103,9 @@ export class Zoom {
             .style('background', 'ivory'),
         (update) =>
           update.html((d) =>
-            this.scatterplot.tooltip_html(d.data, this.scatterplot)
+            this.scatterplot.tooltip_html(d.data, this.scatterplot),
           ),
-        (exit) => exit.call((e) => e.remove())
+        (exit) => exit.call((e) => e.remove()),
       );
 
     els
@@ -150,11 +151,7 @@ export class Zoom {
         [width, height],
       ])
       .on('zoom', (event: D3ZoomEvent<Element, unknown>) => {
-        try {
-          document.getElementById('tooltipcircle').remove();
-        } catch (error) {
-          // console.log(error);
-        }
+        document.getElementById('tooltipcircle')?.remove();
         this.transform = event.transform;
         this.restart_timer(10 * 1000);
 
@@ -179,19 +176,19 @@ export class Zoom {
 
     const annotations: Annotation[] = data.map((d) => {
       return {
-      x: x_((xdim.apply(d))),
-      y: y_((ydim.apply(d))),
-      data: d,
-      dx: 0,
-      dy: 30,
-      }
-    })
+        x: x_(xdim.apply(d)),
+        y: y_(ydim.apply(d)),
+        data: d,
+        dx: 0,
+        dy: 30,
+      };
+    });
     this.html_annotation(annotations);
 
     const sel = this.svg_element_selection.select('#mousepoints');
     sel
       .selectAll('circle.label')
-      .data(data, (d_ : StructRowProxy) => d_.ix as number) // Unique identifier to not remove existing.
+      .data(data, (d_: StructRowProxy) => d_.ix as number) // Unique identifier to not remove existing.
       .join(
         (enter) =>
           enter
@@ -208,7 +205,7 @@ export class Zoom {
         (exit) =>
           exit.call((e) => {
             e.remove();
-          })
+          }),
       )
       .on('click', (ev, dd) => {
         this.scatterplot.click_function(dd, this.scatterplot);
@@ -238,14 +235,16 @@ export class Zoom {
     });
   }
 
-  current_corners(): Rectangle | undefined {
+  current_corners(): Rectangle {
     // The corners of the current zoom transform, in data coordinates.
     const { width, height } = this;
 
     // Use the rescaled versions of the scales.
     const scales = this.scales();
     if (scales === undefined) {
-      return;
+      throw new Error(
+        'Attempting to get map view before scales have been created',
+      );
     }
     const { x_, y_ } = scales;
 
@@ -386,7 +385,7 @@ export class Zoom {
 
 export function window_transform(
   x_scale: ScaleLinear<number, number, never>,
-  y_scale: ScaleLinear<number, number, never>
+  y_scale: ScaleLinear<number, number, never>,
 ) {
   // width and height are svg parameters; x and y scales project from the data x and y into the
   // the webgl space.
diff --git a/src/label_rendering.ts b/src/label_rendering.ts
index 350e41f17..8fe83d627 100644
--- a/src/label_rendering.ts
+++ b/src/label_rendering.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unnecessary-type-assertion */
 import type { GeoJsonObject, GeoJsonProperties } from 'geojson';
 import { Renderer } from './rendering';
 import { BBox, RBush3D } from 'rbush-3d';
@@ -7,13 +8,15 @@ import { select } from 'd3-selection';
 import { drag } from 'd3-drag';
 import type * as DS from './shared';
 import { Color } from './aesthetics/ColorAesthetic';
+import type { Zoom } from './interaction';
+
 const handler = drag<SVGRectElement, BBox>();
 
 function pixel_ratio(scatterplot: Scatterplot): number {
   // pixelspace
-  const [px1, px2] = scatterplot._zoom.scales().x.range() as [number, number];
+  const [px1, px2] = scatterplot._zoom!.scales().x.range() as [number, number];
   // dataspace
-  const [dx1, dx2] = scatterplot._zoom.scales().x.domain() as [number, number];
+  const [dx1, dx2] = scatterplot._zoom!.scales().x.domain() as [number, number];
   const ratio = (px2 - px1) / (dx2 - dx1);
   return ratio;
 }
@@ -41,14 +44,18 @@ export class LabelMaker extends Renderer {
   constructor(
     scatterplot: Scatterplot,
     id_raw: string,
-    options: DS.LabelOptions = {}
+    options: DS.LabelOptions = {},
   ) {
-    super(scatterplot.div.node() as HTMLDivElement, scatterplot._root, scatterplot);
+    super(
+      scatterplot.div!.node() as HTMLDivElement,
+      scatterplot.dataset,
+      scatterplot,
+    );
     this.options = options;
-    this.canvas = scatterplot.elements[2]
-      .selectAll('canvas')
+    this.canvas = scatterplot
+      .elements![2].selectAll('canvas')
       .node() as HTMLCanvasElement;
-    const svg = scatterplot.elements[3].selectAll('svg').node() as SVGElement;
+    const svg = scatterplot.elements![3].selectAll('svg').node() as SVGElement;
     const id = id_raw.replace(/[!"#$%&'()*+,./:;<=>?@[\\\]^`{|}~]/g, '---');
     const labgroup = svg.querySelectorAll(`#${id}`);
     // eslint-disable-next-line unicorn/prefer-ternary
@@ -57,7 +64,7 @@ export class LabelMaker extends Renderer {
         .select('#labelrects')
         .append('g')
         .attr('id', id)
-        .node();
+        .node() as SVGGElement;
     } else {
       this.labelgroup = labgroup[1] as SVGGElement;
     }
@@ -65,21 +72,21 @@ export class LabelMaker extends Renderer {
     if (this.canvas === undefined) {
       throw new Error('WTF?');
     }
-    this.ctx = this.canvas.getContext('2d');
+    this.ctx = this.canvas.getContext('2d') as CanvasRenderingContext2D;
 
     this.tree = new DepthTree(
       this.ctx,
       pixel_ratio(scatterplot),
       0.5,
       [0.5, 1e6],
-      options.margin === undefined ? 30 : options.margin
+      options.margin === undefined ? 30 : options.margin,
     );
 
     /*    this.tree.accessor = (x, y) => {
       const f = scatterplot._zoom.scales();
       return [f.x(x), f.y(y)];
     };*/
-    this.bind_zoom(scatterplot._renderer.zoom);
+    this.bind_zoom(scatterplot._renderer!.zoom!);
   }
 
   /**
@@ -128,7 +135,7 @@ export class LabelMaker extends Renderer {
   public update(
     featureset: GeoJSON.FeatureCollection,
     label_key: string,
-    size_key: string | undefined
+    size_key: string | undefined,
     //    color_key
   ) {
     // Insert an entire feature collection all at once.
@@ -140,13 +147,17 @@ export class LabelMaker extends Renderer {
       }
       if (geometry.type === 'Point') {
         // The size can be specified; if not, it defaults to 16pt.
-        const size = (properties[size_key] as number) ?? 16;
+        const size =
+          size_key && properties[size_key]
+            ? (properties[size_key] as number)
+            : 16;
+
         let label = '';
         if (
           properties[label_key] !== undefined &&
           properties[label_key] !== null
         ) {
-          label = `${properties[label_key]}`
+          label = `${properties[label_key]}`;
         }
         const p: RawPoint = {
           x: geometry.coordinates[0] + Math.random() * 0.1,
@@ -193,7 +204,7 @@ export class LabelMaker extends Renderer {
         enter
           .append('rect')
           .attr('class', 'labellbox')
-          .style('opacity', RECT_DEFAULT_OPACITY)
+          .style('opacity', RECT_DEFAULT_OPACITY),
       );
 
     const Y_BUFFER = 5;
@@ -238,7 +249,7 @@ export class LabelMaker extends Renderer {
         }
         const exists =
           (dim.scale.domain() as string[]).indexOf(
-            datum.properties[dim.field] as string
+            datum.properties[dim.field] as string,
           ) > -1;
         if (exists) {
           //@ts-expect-error -- it's a string
@@ -279,30 +290,31 @@ export class LabelMaker extends Renderer {
       .attr('class', 'labelbbox')
       .attr(
         'x',
-        (d: P3d) => x_(d.data.x) - (d.data.pixel_width * this.tree.pixel_ratio) / 2
+        (d: P3d) =>
+          x_(d.data.x) - (d.data.pixel_width * this.tree.pixel_ratio) / 2,
       )
       .attr(
         'y',
         (d: P3d) =>
           y_(d.data.y) -
           (d.data.pixel_height * this.tree.pixel_ratio) / 2 -
-          Y_BUFFER
+          Y_BUFFER,
       )
-      .attr('width', (d : P3d) => d.data.pixel_width * this.tree.pixel_ratio)
+      .attr('width', (d: P3d) => d.data.pixel_width * this.tree.pixel_ratio)
       .attr('stroke', 'red')
       .attr(
         'height',
-        (d: P3d) => d.data.pixel_height * this.tree.pixel_ratio + Y_BUFFER * 2
+        (d: P3d) => d.data.pixel_height * this.tree.pixel_ratio + Y_BUFFER * 2,
       )
-      .attr('display', (d : P3d) => {
-        return d.data.properties.__display as string || 'inline';
+      .attr('display', (d: P3d) => {
+        return (d.data.properties.__display as string) || 'inline';
       })
       .on('mouseover', (event, d) => {
         select(event.target).style('opacity', RECT_DEFAULT_OPACITY);
         this.hovered = '' + d.minZ + d.minX;
         event.stopPropagation();
       })
-      .on('mousemove', function (event : MouseEvent) {
+      .on('mousemove', function (event: MouseEvent) {
         event.stopPropagation();
       })
       .on('click', (event, d: P3d) => {
@@ -319,7 +331,7 @@ export class LabelMaker extends Renderer {
         d.data.x = x_.invert(event.x);
         d.data.y = y_.invert(event.y);
       });
-      handler.on('end', (event, d : P3d) => {
+      handler.on('end', (event, d: P3d) => {
         console.log({ text: d.data.text, x: d.data.x, y: d.data.y });
       });
       bboxes.call(handler);
@@ -430,7 +442,7 @@ class DepthTree extends RBush3D {
     pixel_ratio: number,
     scale_factor = 0.5,
     zoom = [0.1, 1000],
-    margin = 10 // in screen pixels
+    margin = 10, // in screen pixels
   ) {
     // scale factor used to determine how quickly points scale.
     // Not implemented.
@@ -537,7 +549,7 @@ class DepthTree extends RBush3D {
     // The depth until which we're hidden; from min_depth (.1 ish) to max_depth(100 ish)
     let hidden_until = -1;
     // The node hiding this one.
-    let hidden_by : P3d;
+    let hidden_by: P3d;
     for (const overlapper of this.search(p3d)) {
       // Find the most closely overlapping 3d block.
       // Although the other ones will retain 3d blocks'
diff --git a/src/regl_rendering.ts b/src/regl_rendering.ts
index 0f3484c94..8d6048ea0 100644
--- a/src/regl_rendering.ts
+++ b/src/regl_rendering.ts
@@ -6,6 +6,7 @@ import wrapREGL, {
   Buffer,
   DrawCommand,
   DrawConfig,
+  DefaultContext,
 } from 'regl';
 import { range, sum } from 'd3-array';
 // import { contours } from 'd3-contour';
@@ -44,6 +45,7 @@ import {
 import { Color } from './aesthetics/ColorAesthetic';
 import { StatefulAesthetic } from './aesthetics/StatefulAesthetic';
 import { Filter, Foreground } from './aesthetics/BooleanAesthetic';
+import { ZoomTransform } from 'd3-zoom';
 // eslint-disable-next-line import/prefer-default-export
 export class ReglRenderer extends Renderer {
   public regl: Regl;
@@ -52,7 +54,6 @@ export class ReglRenderer extends Renderer {
   private _buffers: MultipurposeBufferSet;
   public _initializations: Promise<void>;
   public dataset: Dataset;
-  public zoom?: Zoom;
   public _zoom?: Zoom;
   public most_recent_restart?: number;
   public _default_webgl_scale?: number[];
@@ -133,14 +134,20 @@ export class ReglRenderer extends Renderer {
 
     // Would be better cached per draw call.
     this.allocate_aesthetic_buffers();
+    if (!this.zoom) {
+      throw new Error('Unable to draw before zoom state set up.');
+    }
+    if (!this.most_recent_restart)
+      throw new Error('Failed to populate restart');
     const {
       prefs,
       aes_to_buffer_num,
       buffer_num_to_variable,
       variable_to_buffer_num,
     } = this;
-    const transform = this.zoom.transform;
-    const colorScales = this.aes.dim('color');
+    const transform: ZoomTransform = this.zoom
+      .transform as unknown as ZoomTransform;
+    const colorScales = this.aes.dim('color') as StatefulAesthetic<Color>;
     const [currentColor, lastColor] = [
       colorScales.current,
       colorScales.last,
@@ -172,9 +179,9 @@ export class ReglRenderer extends Renderer {
       last_webgl_scale: this._webgl_scale_history[1],
       use_scale_for_tiles: this._use_scale_to_download_tiles,
       grid_mode: 0,
-      buffer_num_to_variable,
-      aes_to_buffer_num,
-      variable_to_buffer_num,
+      buffer_num_to_variable: buffer_num_to_variable!,
+      aes_to_buffer_num: aes_to_buffer_num!,
+      variable_to_buffer_num: variable_to_buffer_num!,
       color_picker_mode: 0, // whether to draw as a color picker.
       position_interpolation: this.aes.position_interpolation,
       zoom_matrix: [
@@ -297,8 +304,7 @@ export class ReglRenderer extends Renderer {
     try {
       this.render_all(props);
     } catch (error) {
-      console.warn('ERROR NOTED');
-      this.reglframe.cancel();
+      this.reglframe!.cancel();
       throw error;
     }
   }
@@ -665,16 +671,16 @@ export class ReglRenderer extends Renderer {
 
     const { props } = this;
     props.only_color = only_color;
-    let v: number;
+    let v: number = -1;
     this.fbos.contour.use(() => {
       this.regl.clear({ color: [0, 0, 0, 0] });
       // read onto the contour vals.
       this.render_points(props);
-      this.regl.read(this.contour_vals);
+      this.regl.read(this.contour_vals as Uint8Array);
       // Could be done faster on the GPU itself.
       // But would require writing to float textures, which
       // can be hard.
-      v = sum(this.contour_vals);
+      v = sum(this.contour_vals as Uint8Array);
     });
     return v;
   }
@@ -757,29 +763,6 @@ export class ReglRenderer extends Renderer {
     return point_as_int;
   }
 
-  /* blur(fbo) {
-  var passes = [];
-  var radii = [Math.round(
-    Math.max(1, state.bloom.radius * pixelRatio / state.bloom.downsample))];
-  for (var radius = nextPow2(radii[0]) / 2; radius >= 1; radius /= 2) {
-    radii.push(radius);
-  }
-  radii.forEach(radius => {
-    for (var pass = 0; pass < state.bloom.blur.passes; pass++) {
-      passes.push({
-        kernel: 13,
-        src: bloomFbo[0],
-        dst: bloomFbo[1],
-        direction: [radius, 0]
-      }, {
-        kernel: 13,
-        src: bloomFbo[1],
-        dst: bloomFbo[0],
-        direction: [0, radius]
-      });
-    }
-  })
-} */
   get fill_buffer() {
     //
     if (!this._fill_buffer) {
@@ -811,14 +794,14 @@ export class ReglRenderer extends Renderer {
       this.regl.clear({ color: [0, 0, 0, 0] });
       // read onto the contour vals.
       this.render_points(props);
-      this.regl.read(this.contour_vals);
+      this.regl.read(this.contour_vals!);
     });
 
     // 3-pass blur
     this.blur(this.fbos.contour, this.fbos.ping, 3);
 
     this.fbos.contour.use(() => {
-      this.regl.read(this.contour_vals);
+      this.regl.read(this.contour_vals!);
     });
 
     let i = 0;
@@ -834,6 +817,7 @@ export class ReglRenderer extends Renderer {
     const { regl } = this;
     // This should be scoped somewhere to allow resizing.
     type P = DS.TileDrawProps;
+    type C = DefaultContext;
     const parameters: DrawConfig<unknown, unknown, DS.TileDrawProps> = {
       depth: { enable: false },
       stencil: { enable: false },
@@ -862,7 +846,7 @@ export class ReglRenderer extends Renderer {
         u_transition_duration(_, props: P) {
           return props.prefs.duration; // Using seconds, not milliseconds, in there
         },
-        u_only_color(_, props: P) {
+        u_only_color(_: C, props: P) {
           if (props.only_color !== undefined) {
             return props.only_color;
           }
@@ -871,7 +855,7 @@ export class ReglRenderer extends Renderer {
           // Other values plot a specific value of the color-encoded field.
           return -2;
         },
-        u_wrap_colors_after: (_, { wrap_colors_after }: P) => {
+        u_wrap_colors_after: (_: unknown, { wrap_colors_after }: P) => {
           if (wrap_colors_after === undefined) {
             throw new Error('wrap_colors_after is undefined');
           }
@@ -893,7 +877,7 @@ export class ReglRenderer extends Renderer {
           }
           return 0;
         },
-        u_grid_mode: (_, { grid_mode }: P) => grid_mode,
+        u_grid_mode: (_: C, { grid_mode }: P) => grid_mode,
         u_colors_as_grid: (_, { colors_as_grid }: P) => colors_as_grid,
         /*        u_constant_color: () => (this.aes.dim("color").current.constant !== undefined
           ? this.aes.dim("color").current.constant
@@ -901,19 +885,19 @@ export class ReglRenderer extends Renderer {
         u_constant_last_color: () => (this.aes.dim("color").last.constant !== undefined
           ? this.aes.dim("color").last.constant
           : [-1, -1, -1]),*/
-        u_tile_id: (_, props: P) => props.tile_id,
-        u_width: ({ viewportWidth }) => viewportWidth as number,
-        u_height: ({ viewportHeight }) => viewportHeight as number,
+        u_tile_id: (_: C, props: P) => props.tile_id,
+        u_width: ({ viewportWidth }: C) => viewportWidth,
+        u_height: ({ viewportHeight }: C) => viewportHeight,
         u_one_d_aesthetic_map: this.aes.aesthetic_map.one_d_texture,
         u_color_aesthetic_map: this.aes.aesthetic_map.color_texture,
-        u_aspect_ratio: ({ viewportWidth, viewportHeight }) =>
+        u_aspect_ratio: ({ viewportWidth, viewportHeight }: C) =>
           viewportWidth / viewportHeight,
         //@ts-expect-error Don't know about regl props.
         u_zoom_balance: regl.prop('zoom_balance'),
-        u_base_size: (_, { point_size }) => point_size as number,
-        u_maxix: (_, { max_ix }) => max_ix as number,
-        u_alpha: (_, { alpha }) => alpha as number,
-        u_foreground_number: (_, { foreground }) => foreground as number,
+        u_base_size: (_: C, { point_size }: P) => point_size,
+        u_maxix: (_: C, { max_ix }: P) => max_ix,
+        u_alpha: (_: C, { alpha }: P) => alpha,
+        u_foreground_number: (_: C, { foreground }: P) => foreground as number,
         u_foreground_alpha: () => this.render_props.foreground_opacity,
         u_background_rgba: () => {
           const color = this.prefs.background_options.color;
@@ -929,7 +913,7 @@ export class ReglRenderer extends Renderer {
           this.prefs.background_options.mouseover ? 1 : 0,
         u_background_size: () => this.render_props.background_size,
         u_foreground_size: () => this.render_props.foreground_size,
-        u_k: (_, props: P) => {
+        u_k: (_: DefaultContext, props: P) => {
           return props.transform.k;
         },
         // Allow interpolation between different coordinate systems.
@@ -940,7 +924,7 @@ export class ReglRenderer extends Renderer {
         u_time: ({ time }: P) => time,
         u_jitter: () => this.aes.jitter_int_format('current'),
         u_last_jitter: () => this.aes.jitter_int_format('last'),
-        u_zoom(_, props: P) {
+        u_zoom(_: C, props: P) {
           return props.zoom_matrix;
         },
       },
@@ -1285,10 +1269,7 @@ export class TileBufferManager {
     if (!column.type || column.type.typeId !== Type.Float32) {
       const buffer = new Float32Array(tile.record_batch.numRows);
       const source_buffer = column.data[0];
-
-      if (column.type['dictionary']) {
-        // We set the dictionary values down by 2047 so that we can use
-        // even half-precision floats for direct indexing.
+      if (column.type.typeId === Type.Dictionary) {
         for (let i = 0; i < tile.record_batch.numRows; i++) {
           buffer[i] = (source_buffer as Data<Dictionary<Utf8>>).values[i];
         }
diff --git a/src/rendering.ts b/src/rendering.ts
index 30395c2da..2244357dd 100644
--- a/src/rendering.ts
+++ b/src/rendering.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unnecessary-type-assertion */
 /* eslint-disable no-underscore-dangle */
 import { BaseType, select } from 'd3-selection';
 import { min } from 'd3-array';
@@ -130,7 +131,6 @@ export class Renderer {
   // The renderer handles periodic dispatches of calls
   public deferred_functions: Array<() => Promise<void> | void>;
   public _use_scale_to_download_tiles = true;
-  public zoom?: Zoom;
   public aes?: AestheticSet;
   public _zoom?: Zoom;
   public render_props: RenderProps = new RenderProps();
@@ -142,7 +142,7 @@ export class Renderer {
     this.scatterplot = scatterplot;
     this.holder = select(selector as string);
     this.canvas = select(
-      this.holder.node().firstElementChild,
+      this.holder!.node()!.firstElementChild,
     ).node() as HTMLCanvasElement;
     this.dataset = tileSet;
     this.width = +select(this.canvas).attr('width');
@@ -191,8 +191,7 @@ export class Renderer {
     const total_intended_points = min([
       max_ix,
       this.dataset.highest_known_ix || 1e10,
-    ]);
-
+    ]) as number;
     const total_points = total_intended_points * (1 - discard_share);
 
     const size_adjust = Math.exp(Math.log(k) * zoom_balance);
@@ -217,7 +216,7 @@ export class Renderer {
     if (!this._use_scale_to_download_tiles) {
       return max_points;
     }
-    const k = this.zoom.transform.k;
+    const k = this.zoom.transform!.k;
     const point_size_adjust = Math.exp(Math.log(k) * prefs.zoom_balance);
     return (max_points * k * k) / point_size_adjust / point_size_adjust;
   }
@@ -229,6 +228,7 @@ export class Renderer {
     const { dataset: tileSet } = this;
     // Materialize using a tileset method.
 
+    if (!this.aes) throw new Error('Aesthetic missing');
     const x = this.aes.dim('x') as StatefulAesthetic<PositionalAesthetic>;
     const y = this.aes.dim('x') as StatefulAesthetic<PositionalAesthetic>;
     const natural_display =
@@ -252,8 +252,13 @@ export class Renderer {
     return all_tiles;
   }
 
+  get zoom(): Zoom {
+    if (this._zoom === undefined) throw new Error('Zoom state not yet bound');
+    return this._zoom as Zoom;
+  }
+
   bind_zoom(zoom: Zoom) {
-    this.zoom = zoom;
+    this._zoom = zoom;
     return this;
   }
 
diff --git a/src/scatterplot.ts b/src/scatterplot.ts
index f7d948808..8e04c3dc0 100644
--- a/src/scatterplot.ts
+++ b/src/scatterplot.ts
@@ -207,6 +207,9 @@ export class Scatterplot {
     duration = this.prefs.duration,
   ): Promise<DataSelection> {
     const selection = await this.select_data(params);
+    if (selection === null) {
+      throw new Error(`Invalid selection: ${JSON.stringify(params)}`);
+    }
     await selection.ready;
     await this.plotAPI({
       duration,
@@ -268,7 +271,11 @@ export class Scatterplot {
    *   **or** a keyed of values like `{'Rome': 3, 'Vienna': 13}` in which case the numeric values will be used.
    * @param key_field The field in which to look for the identifiers.
    */
-  join(name: string, codes: Record<string, number>, key_field: string) {
+  join(
+    name: string,
+    codes: Record<string, number> | string[],
+    key_field: string,
+  ) {
     let true_codes: Record<string, number>;
 
     if (Array.isArray(codes)) {
@@ -276,8 +283,10 @@ export class Scatterplot {
         codes.map((next: string | bigint) => [String(next), 1]),
       );
     } else {
-      this._root.add_label_identifiers(true_codes, name, key_field);
+      true_codes = codes;
     }
+
+    this.dataset.add_label_identifiers(true_codes, name, key_field);
   }
 
   async add_labels_from_url(
@@ -412,7 +421,7 @@ export class Scatterplot {
       HTMLDivElement,
       HTMLCanvasElement
     >;
-    const ctx = bkgd.node().getContext('2d');
+    const ctx = bkgd.node()!.getContext('2d');
 
     if (ctx === null) throw new Error("Can't acquire canvas context");
     ctx.fillStyle = prefs.background_color ?? 'rgba(133, 133, 111, .8)';
@@ -460,18 +469,18 @@ export class Scatterplot {
      * loaded tiles. Useful for debugging and illustration.
      */
 
-    const canvas = this.elements[2]
-      .selectAll('canvas')
-      .node() as HTMLCanvasElement;
+    const canvas = this.elements![2].selectAll(
+      'canvas',
+    ).node() as HTMLCanvasElement;
 
-    const ctx = canvas.getContext('2d');
+    const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
 
     // as CanvasRenderingContext2D;
 
     ctx.clearRect(0, 0, 10_000, 10_000);
-    const { x_, y_ } = this._zoom.scales();
+    const { x_, y_ } = this._zoom!.scales();
     ctx.strokeStyle = '#888888';
-    const tiles = this._root.map((t) => t);
+    const tiles = this.dataset.map((t) => t);
     for (const i of range(20)) {
       setTimeout(() => {
         for (const tile of tiles) {
@@ -507,16 +516,18 @@ export class Scatterplot {
     this._renderer?.regl?.destroy();
 
     const node = this.div?.node() as Node;
-    node.parentElement.replaceChildren();
+    node.parentElement!.replaceChildren();
   }
 
   update_prefs(prefs: DS.APICall) {
     // Stash the previous values for interpolation.
 
     if (this.prefs.encoding && prefs.encoding) {
-      for (const k of Object.keys(this.prefs.encoding)) {
+      for (const k of Object.keys(
+        this.prefs.encoding,
+      ) as (keyof DS.Encoding)[]) {
         if (prefs.encoding[k] !== undefined) {
-          this.prefs.encoding[k] = prefs.encoding[k] as DS.Encoding;
+          this.prefs.encoding[k] = prefs.encoding[k];
         }
       }
     }
@@ -553,7 +564,7 @@ export class Scatterplot {
       if (v && v['label_key'] !== undefined) {
         (this.secondary_renderers[k] as LabelMaker).stop();
         (this.secondary_renderers[k] as LabelMaker).delete();
-        this.secondary_renderers[k] = undefined;
+        delete this.secondary_renderers[k];
       }
     }
   }
@@ -567,7 +578,7 @@ export class Scatterplot {
    */
 
   public dim(dimension: DS.Dimension): ConcreteAesthetic {
-    return this._renderer.aes.dim(dimension).current;
+    return this._renderer!.aes.dim(dimension)!.current;
   }
 
   set tooltip_html(func) {
@@ -769,32 +780,33 @@ export class Scatterplot {
     if (this._zoom === undefined) {
       await this.reinitialize();
     }
-
-    this._renderer.render_props.apply_prefs(this.prefs);
+    const renderer = this._renderer as ReglRenderer;
+    const zoom = this._zoom as Zoom;
+    this._renderer!.render_props.apply_prefs(this.prefs);
 
     const { width, height } = this;
     this.update_prefs(prefs);
 
     if (prefs.zoom !== undefined) {
       if (prefs.zoom === null) {
-        this._zoom.zoom_to(1, width / 2, height / 2);
+        zoom.zoom_to(1, width / 2, height / 2);
         prefs.zoom = undefined;
       } else if (prefs.zoom?.bbox) {
-        this._zoom.zoom_to_bbox(prefs.zoom.bbox, prefs.duration);
+        zoom.zoom_to_bbox(prefs.zoom.bbox, prefs.duration);
       }
     }
 
-    this._renderer.most_recent_restart = Date.now();
-    this._renderer.aes.apply_encoding(prefs.encoding ?? {});
+    renderer.most_recent_restart = Date.now();
+    renderer.aes.apply_encoding(prefs.encoding ?? {});
 
-    if (this._renderer.reglframe) {
-      const r = this._renderer.reglframe;
+    if (renderer.reglframe) {
+      const r = renderer.reglframe;
       r.cancel();
-      this._renderer.reglframe = undefined;
+      renderer.reglframe = undefined;
     }
 
-    this._renderer.reglframe = this._renderer.regl.frame(() => {
-      this._renderer.tick();
+    renderer.reglframe = renderer.regl.frame(() => {
+      renderer.tick();
     });
 
     if (prefs.labels !== undefined) {
@@ -827,7 +839,7 @@ export class Scatterplot {
       }
     }
 
-    this._zoom.restart_timer(60_000);
+    zoom.restart_timer(60_000);
   }
 
   get root_batch() {
@@ -843,13 +855,27 @@ export class Scatterplot {
    */
   get query(): DS.APICall {
     const p = JSON.parse(JSON.stringify(this.prefs)) as DS.APICall;
-    p.zoom = { bbox: this._renderer.zoom.current_corners() };
+    p.zoom = { bbox: this.renderer.zoom.current_corners() };
     return p;
   }
 
+  get renderer(): ReglRenderer {
+    if (this._renderer === undefined) {
+      throw new Error('No renderer has been initialized');
+    }
+    return this._renderer;
+  }
+
+  get zoom(): Zoom {
+    if (this._zoom === undefined) {
+      throw new Error('No zoom has been initialized');
+    }
+    return this._zoom;
+  }
+
   sample_points(n = 10): Record<string, number | string>[] {
     const vals: Record<string, number | string>[] = [];
-    for (const p of this._root.points(this._zoom.current_corners())) {
+    for (const p of this.dataset.points(this.zoom.current_corners())) {
       vals.push({ ...p });
       if (vals.length >= n * 3) {
         break;
@@ -893,7 +919,7 @@ class LabelClick extends SettableFunction<void, GeoJsonProperties> {
   default(
     feature: GeoJsonProperties,
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    plot: Scatterplot = undefined,
+    plot: Scatterplot | undefined = undefined,
     labelset: LabelMaker | undefined = undefined,
   ) {
     let filter: DS.LambdaChannel<string, boolean> | null;
@@ -931,14 +957,14 @@ class ChangeToHighlitPointFunction extends SettableFunction<
   StructRowProxy[]
 > {
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  default(points: StructRowProxy[], plot: Scatterplot = undefined) {
+  default(points: StructRowProxy[], plot: Scatterplot | undefined = undefined) {
     return;
   }
 }
 
 class TooltipHTML extends SettableFunction<string> {
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  default(point: StructRowProxy, plot: Scatterplot = undefined) {
+  default(point: StructRowProxy, plot: Scatterplot | undefined = undefined) {
     // By default, this returns a
     let output = '<dl>';
     const nope: Set<string | null | number | symbol> = new Set([
diff --git a/src/utilityFunctions.ts b/src/utilityFunctions.ts
index 63c0a7f53..32eb14e09 100644
--- a/src/utilityFunctions.ts
+++ b/src/utilityFunctions.ts
@@ -9,7 +9,7 @@ import {
   makeVector,
 } from 'apache-arrow';
 
-type IndicesType = null | Int8Array | Int16Array | Int32Array;
+type IndicesType = Int8Array | Int16Array | Int32Array;
 type DictionaryType = Dictionary<Utf8, Int8 | Int16 | Int32>;
 
 // We need to keep track of the current dictionary number
@@ -82,21 +82,3 @@ function createDictionaryWithVector(
 
   return returnval;
 }
-
-export function LazyGetter() {
-  return function (target: any, key: string, descriptor: PropertyDescriptor) {
-    const originalMethod = descriptor.get;
-
-    descriptor.get = function () {
-      const cacheKey = `_____${key}`;
-
-      if (!this[cacheKey]) {
-        this[cacheKey] = originalMethod.call(this);
-      }
-
-      return this[cacheKey];
-    };
-
-    return descriptor;
-  };
-}
diff --git a/tsconfig.json b/tsconfig.json
index a2293466a..984330cd8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,7 +14,7 @@
     "noUnusedLocals": true,
     "experimentalDecorators": true,
     "sourceMap": true,
-    "strict": false,
+    "strict": true,
     "target": "es2020",
     "isolatedModules": true,
     "outDir": "./dist",