TS migration. #2288. (#2328)

* Added TS. Updated build and linting config. Added types.

* [ts-migrate][.] Rename files from JS/JSX to TS/TSX

Co-authored-by: ts-migrate <>

* [ts-migrate][.] Run TS Migrate

Co-authored-by: ts-migrate <>

* Corrected files mangled by ts-migrate.

* Updated lint config, minor linting.

* Re-enabled Husky.

* Updated tests and config.

* Reverted webpack devtool config.

* Removed obsolete snapshots.

* Added annotations snap.

* Updated tsconfig includes wrt linting.

* Removed ts-migrate.

Co-authored-by: Timmy Huang <tihuan@users.noreply.github.com>

client/src/util/maybeScientific.js

@@ -1,27 +0,0 @@
-import significantDigits from "./significantDigits";
-
-/**
- * The function will conditionally convert a d3 axis label to scientific notation
- * @param x - a d3 axis, ie:
- *  d3
- *    .axisBottom(x)
- *    .ticks(4)
- *    .tickFormat(d3.format(maybeScientific(x)))
- * @returns - the number formatted as scientific, if it's big enough
- */
-
-export default function maybeScientific(x) {
-  let format = ",";
-  const _ticks = x.ticks(4);
-
-  if (x.domain().some((n) => Math.abs(n) >= 10000)) {
-    /* 
-          heuristic: if the last tick d3 wants to render has one significant
-          digit ie., 2000, render 2e+3, but if it's anything else ie., 42000000 render
-          4.20e+n
-        */
-    format = significantDigits(_ticks[_ticks.length - 1]) === 1 ? ".0e" : ".2e";
-  }
-
-  return format;
-}