Fix util import errors in Test262

tc39#715 broke Test262 tests (specifically the ability to
`import * from 'es-abstract'), and I couldn't figure out how
to import individual es-abstract js functions from the PoC
TypeScript code, so I gave up and hacked up the three es-abstract
methods (ToString, ToObject, and ToInteger) that the PoC uses.
A real JS implementation will simply depend on ecmascript.js, so it
wasn't worth doing a real implementation. I apologize for how bad
this placeholder code is. ;-(

polyfill/lib/localdatetime.mjs

@@ -1,4 +1,3 @@
-import ES2019 from 'es-abstract/es2019.js';
 import { GetIntrinsic, MakeIntrinsicClass } from './intrinsicclass.mjs';
 
 const Temporal = {
@@ -1110,9 +1109,26 @@ function toLargestTemporalUnit(options, fallback, disallowedStrings = []) {
 }
 
 const ES = {
-  ToInteger: ES2019.ToInteger,
-  ToString: ES2019.ToString,
-  ToObject: ES2019.ToObject,
+  // The three hacky conversion implementations below are placeholders because I
+  // couldn't figure out how to import es-abstract methods in TypeScript without
+  // triggering failures in test262 scripts caused by `util` being missing.  And
+  // I was too lazy to copy/paste the es-abstract implementations. The real
+  // implementation in JS won't have these problems.
+  ToInteger: (value) => {
+    if (typeof value === 'symbol') throw new TypeError('Cannot convert a Symbol value to a number');
+    if (typeof value === 'boolean') throw new TypeError('Cannot convert a boolean value to an integer');
+    if (typeof value === 'undefined') return 0;
+    if (value === 'null') throw new TypeError('Cannot convert a null value to an integer');
+    const n = Number(value);
+    if (isNaN(n)) throw new TypeError('Cannot convert value to an integer');
+    return Math.floor(n);
+  },
+  ToString: (s) => Object(s).toString(),
+  ToObject: (s) => {
+    if (s == null) throw new TypeError(`Cannot coerce ${s} to Object`);
+    if (typeof s !== 'object') throw new TypeError(`Expected object, received ${typeof s}`);
+    return s;
+  },
 
   // replace this with public parsing API after it lands
   ParseFullISOString: (isoString) => {

polyfill/lib/poc/LocalDateTime.ts

@@ -1,5 +1,5 @@
 import { Temporal } from '../..';
-import * as ES2019 from 'es-abstract';
+// import { ToInteger, ToObject, ToString } from 'es-abstract';
 
 export type LocalDateTimeLike = Temporal.DateTimeLike & {
   /**`Temporal.TimeZone`, IANA time zone identifier, or offset string */
@@ -1295,9 +1295,26 @@ function toLargestTemporalUnit<V extends keyof Temporal.DurationLike, F extends
 }
 
 const ES = {
-  ToInteger: ES2019.ToInteger,
-  ToString: ES2019.ToString,
-  ToObject: ES2019.ToObject,
+  // The three hacky conversion implementations below are placeholders because I
+  // couldn't figure out how to import es-abstract methods in TypeScript without
+  // triggering failures in test262 scripts caused by `util` being missing.  And
+  // I was too lazy to copy/paste the es-abstract implementations. The real
+  // implementation in JS won't have these problems.
+  ToInteger: (value: unknown) => {
+    if (typeof value === 'symbol') throw new TypeError('Cannot convert a Symbol value to a number');
+    if (typeof value === 'boolean') throw new TypeError('Cannot convert a boolean value to an integer');
+    if (typeof value === 'undefined') return 0;
+    if (value === 'null') throw new TypeError('Cannot convert a null value to an integer');
+    const n = Number(value);
+    if (isNaN(n)) throw new TypeError('Cannot convert value to an integer');
+    return Math.floor(n);
+  },
+  ToString: (s: unknown) => Object(s).toString(),
+  ToObject: (s: unknown) => {
+    if (s == null) throw new TypeError(`Cannot coerce ${s} to Object`);
+    if (typeof s !== 'object') throw new TypeError(`Expected object, received ${typeof s}`);
+    return s;
+  },
 
   // replace this with public parsing API after it lands
   ParseFullISOString: (isoString: string) => {

polyfill/lib/poc/postProcess.js

@@ -20,7 +20,7 @@ function processDts(file, original, final) {
 function processMjs(file) {
   let lines = readAllLines(file);
   const prepend = [
-    "import ES2019 from 'es-abstract/es2019.js';",
+    // "import ES2019 from 'es-abstract/es2019.js';",
     "import { GetIntrinsic, MakeIntrinsicClass } from './intrinsicclass.mjs'",
     '',
     'const Temporal = {',