Knip 8: remove unused exports (#1778)

## Summary:
Knip identified these as both unused internally and not exported through our main export files, but please double check!

As far as I can tell, a lot of this was copy/pasted from Webapp where there are duplicate declarations there.

Author: handeyeco

Reviewers: benchristel

Required Reviewers:

Approved By: benchristel

Checks: ✅ Publish npm snapshot (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Publish Storybook to Chromatic (ubuntu-latest, 20.x), ✅ gerald

Pull Request URL: #1778

Author: handeyeco

.changeset/rotten-turkeys-pump.md

@@ -0,0 +1,7 @@
+---
+"@khanacademy/math-input": patch
+"@khanacademy/perseus": patch
+"@khanacademy/perseus-linter": patch
+---
+
+Remove unused dead code

packages/math-input/src/components/aphrodite-css-transition-group/util.ts

@@ -1,7 +1,6 @@
 import {entries} from "@khanacademy/wonder-stuff-core";
 import {StyleSheet, css} from "aphrodite";
 
-import type {InAnimationStyles} from "./types";
 import type {StyleType} from "@khanacademy/wonder-blocks-core";
 import type {CSSProperties} from "aphrodite";
 
@@ -88,10 +87,3 @@ export function processStyleType(style?: StyleType): {
         className: css(...stylesheetStyles),
     };
 }
-
-export const createTransition = (styles: InAnimationStyles) => {
-    // NOTE(kevinb): TypeScript infers the optional properties on `InAnimationStyles`
-    // as `CSSProperties | undefined`.  This is not compatible with `StyleSheet.create`
-    // which expects `CSSProperties` on the object that's passed in to it.
-    return StyleSheet.create(styles as any);
-};

packages/math-input/src/components/tabbar/item.tsx

@@ -165,6 +165,4 @@ function TabbarItem(props: TabItemProps): React.ReactElement {
     );
 }
 
-export const TabbarItemForTesting = TabbarItem;
-
 export default TabbarItem;

packages/perseus-linter/src/rules/lint-utils.ts

@@ -14,34 +14,3 @@ export function getHostname(url: string): string {
     const match = url.match(HOSTNAME);
     return match ? match[1] : "";
 }
-
-// This list of domains that count as internal domains is from
-// webapp/content/models.py and webapp/url_util.py
-const internalDomains = {
-    "khanacademy.org": true,
-    "www.khanacademy.org": true,
-    "kasandbox.org": true,
-    "fastly.kastatic.org": true,
-    "cdn.kastatic.org": true, // This isn't a link to cdn.kastatic.org
-    "ka-youtube-converted.storage.googleapis.com": true,
-    "KA-share.s3.amazonaws.com": true,
-    "ka-article-iframes.s3.amazonaws.com": true,
-    "ka-cs-algorithms.s3.amazonaws.com": true,
-    "ka-cs-challenge-images.s3.amazonaws.com": true,
-    "ka-cs-scratchpad-audio.s3.amazonaws.com": true,
-    "ka-exercise-screenshots.s3.amazonaws.com": true,
-    "ka-exercise-screenshots-2.s3.amazonaws.com": true,
-    "ka-exercise-screenshots-3.s3.amazonaws.com": true,
-    "ka-learnstorm.s3.amazonaws.com": true,
-    "ka-mobile.s3.amazonaws.com": true,
-    "ka-perseus-graphie.s3.amazonaws.com": true,
-    "ka-perseus-images.s3.amazonaws.com": true,
-} as const;
-
-// Returns true if this URL is relative, or if it is an absolute
-// URL with one of the domains listed above as its hostname.
-export function isInternalURL(url: string): boolean {
-    const hostname = getHostname(url);
-    // eslint-disable-next-line no-prototype-builtins
-    return hostname === "" || internalDomains.hasOwnProperty(hostname);
-}

packages/perseus/src/multi-items/prop-type-builders.ts

@@ -11,36 +11,6 @@ import PropTypes from "prop-types";
 
 import type {Shape} from "./shape-types";
 
-/**
- * A recursive PropType that accepts Shape objects, and rejects other objects.
- *
- * Usage: `propTypes: {shape: shapePropType}`.
- */
-export function shapePropType(...args: ReadonlyArray<any>): any {
-    const itemShape = PropTypes.oneOfType([
-        PropTypes.shape({
-            type: PropTypes.oneOf(["content"]).isRequired,
-        }).isRequired,
-        PropTypes.shape({
-            type: PropTypes.oneOf(["hint"]).isRequired,
-        }).isRequired,
-        PropTypes.shape({
-            type: PropTypes.oneOf(["tags"]).isRequired,
-        }).isRequired,
-        PropTypes.shape({
-            type: PropTypes.oneOf(["object"]).isRequired,
-            shape: PropTypes.objectOf(shapePropType),
-        }).isRequired,
-        PropTypes.shape({
-            type: PropTypes.oneOf(["array"]).isRequired,
-            elementShape: shapePropType,
-        }).isRequired,
-    ]);
-
-    // @ts-expect-error - TS2556 - A spread argument must either have a tuple type or be passed to a rest parameter.
-    return itemShape(...args);
-}
-
 /**
  * Return a PropType that accepts Items of the given shape, and rejects other
  * objects.

packages/perseus/src/sigfigs.ts

@@ -15,51 +15,6 @@
  * GNU General Public License for more details.
  */
 
-/**
- * An object tho both scans floating points to
- * determine the number of significant figures.
- * and can display a floating point using any number
- * of significant figures.
- *
- * @param s A string representation of a floating point.
- */
-export class SignificantFigures {
-    order: number;
-    mantissa: string;
-    positive: boolean;
-    sigFigs: number;
-    sigDecs: number;
-
-    constructor(s: string) {
-        this.order = parseOrder(s);
-        this.mantissa = parseMantissa(s);
-        this.positive = parseSign(s);
-
-        /**
-         * Get the number of significant figures this object uses.
-         * Leading zeros are not significant.  Traling zeros up to
-         * and after the decimal point are significant.
-         * Significant figures is good to know when the number is
-         * used in multiplication.
-         *
-         * @return the number of significant figures.
-         */
-        this.sigFigs = this.mantissa.length;
-
-        /**
-         * Get the least significant decimal this object uses.
-         * This is useful to know if a number is being used
-         * in addition.
-         * 400 - 2 the hundreds place (10^2) is the least significant decimal.
-         * 75 - 0 the ones place (10^0) is the least significant decimal.
-         * .543 - -3 the 1/1000's place (10^-3) is the least significant decimal.
-         *
-         * @return an integer representing the least significant decimal place.
-         */
-        this.sigDecs = this.order - this.mantissa.length;
-    }
-}
-
 /**
  * Format a floating point for display using the specified
  * number of significant figures and least significant decimal.

packages/perseus/src/widgets/interactive-graphs/graphs/use-transform.ts

@@ -68,8 +68,3 @@ export function pixelsToVectors(
         return [x, y];
     });
 }
-
-export const useTransformPixelsToVectors = (...pixels: vec.Vector2[]) => {
-    const graphState = useGraphConfig();
-    return pixelsToVectors(pixels, graphState);
-};

packages/perseus/src/widgets/numeric-input/numeric-input.testdata.ts

@@ -33,39 +33,6 @@ export const question1: PerseusRenderer = {
     },
 };
 
-export const question2: PerseusRenderer = {
-    content: "$5008 \\div 4 =$ [[\u2603 numeric-input 1]] ",
-    images: {},
-    widgets: {
-        "numeric-input 1": {
-            graded: true,
-            version: {
-                major: 0,
-                minor: 0,
-            },
-            static: false,
-            type: "numeric-input",
-            options: {
-                coefficient: false,
-                static: false,
-                answers: [
-                    {
-                        status: "correct",
-                        maxError: null,
-                        strict: false,
-                        value: 1252,
-                        simplify: "required",
-                        message: "",
-                    },
-                ],
-                labelText: "What's the answer?",
-                size: "normal",
-            },
-            alignment: "default",
-        } as NumericInputWidget,
-    },
-};
-
 export const percentageProblem: PerseusRenderer = {
     content: "$5008 \\div 4 =$ [[\u2603 numeric-input 1]] ",
     images: {},

testing/wait.ts

@@ -84,16 +84,6 @@ export const wait: (options?: WaitOptions) => Promise<void> = ({
     return unverifiedWait(normalizedDelay, normalizedCount);
 };
 
-const FRAME_DURATION = 17;
-
-/**
- * Wait for the given delay.
- *
- * This will throw if jest.useRealTimers() is not used.
- */
-export const waitForAnimationFrame: () => Promise<void> = () =>
-    wait({delay: FRAME_DURATION});
-
 /**
  * Waits for the initial Graphie render.
  *