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Minor updates from code reviews
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* Change unnecessary `let` to `const`.
* Add type annotations that were removed while rebasing, and add
  them for newly-added methods.
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@justingrant
justingrant committed Mar 5, 2024
1 parent e8054c7 commit 2238550
Showing 1 changed file with 45 additions and 18 deletions.
63 changes: 45 additions & 18 deletions lib/ecmascript.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -217,7 +217,7 @@ export function ToNumber(value: unknown): number {
return NumberCtor(value);
}

export function ToIntegerOrInfinity(value: unknown) {
export function ToIntegerOrInfinity(value: unknown): number {
const number = ToNumber(value);
if (NumberIsNaN(number) || number === 0) {
return 0;
Expand Down Expand Up @@ -308,7 +308,7 @@ function abs(x: JSBI): JSBI {
}
// This convenience function isn't in the spec, but is useful in the polyfill
// for DRY and better error messages.
export function RequireString(value: unknown) {
export function RequireString(value: unknown): string {
if (typeof value !== 'string') {
// Use String() to ensure that Symbols won't throw
throw new TypeError(`expected a string, not ${StringCtor(value)}`);
Expand All @@ -318,7 +318,7 @@ export function RequireString(value: unknown) {

// This function is an enum in the spec, but it's helpful to make it a
// function in the polyfill.
function ToPrimitiveAndRequireString(valueParam: unknown) {
function ToPrimitiveAndRequireString(valueParam: unknown): string {
const value = ToPrimitive(valueParam, StringCtor);
return RequireString(value);
}
Expand Down Expand Up @@ -702,7 +702,9 @@ function throwBadTimeZoneStringError(timeZoneString: string): never {
throw new RangeError(`${msg}: ${timeZoneString}`);
}

export function ParseTimeZoneIdentifier(identifier: string): { tzName?: string; offsetMinutes?: number } {
export function ParseTimeZoneIdentifier(
identifier: string
): { tzName: string; offsetMinutes?: undefined } | { tzName?: undefined; offsetMinutes: number } {
if (!TIMEZONE_IDENTIFIER.test(identifier)) {
throwBadTimeZoneStringError(identifier);
}
Expand All @@ -719,7 +721,11 @@ export function ParseTimeZoneIdentifier(identifier: string): { tzName?: string;
// ParseTemporalTimeZoneString so that parsing can be tested separately from the
// logic of converting parsed values into a named or offset identifier.
// ts-prune-ignore-next TODO: remove if test/validStrings is converted to TS.
export function ParseTemporalTimeZoneStringRaw(timeZoneString: string) {
export function ParseTemporalTimeZoneStringRaw(timeZoneString: string): {
tzAnnotation: string;
offset: string | undefined;
z: boolean;
} {
if (TIMEZONE_IDENTIFIER.test(timeZoneString)) {
return { tzAnnotation: timeZoneString, offset: undefined, z: false };
}
Expand All @@ -735,7 +741,7 @@ export function ParseTemporalTimeZoneStringRaw(timeZoneString: string) {
throwBadTimeZoneStringError(timeZoneString);
}

function ParseTemporalTimeZoneString(stringIdent: string) {
function ParseTemporalTimeZoneString(stringIdent: string): ReturnType<typeof ParseTimeZoneIdentifier> {
const { tzAnnotation, offset, z } = ParseTemporalTimeZoneStringRaw(stringIdent);
if (tzAnnotation) return ParseTimeZoneIdentifier(tzAnnotation);
if (z) return ParseTimeZoneIdentifier('UTC');
Expand Down Expand Up @@ -1590,7 +1596,16 @@ export function InterpretTemporalDateTimeFields(
}

export function ToTemporalDateTime(item: PlainDateTimeParams['from'][0], options?: PlainDateTimeParams['from'][1]) {
let year, month, day, hour, minute, second, millisecond, microsecond, nanosecond, calendar;
let year: number,
month: number,
day: number,
hour: number,
minute: number,
second: number,
millisecond: number,
microsecond: number,
nanosecond: number,
calendar;
const resolvedOptions = SnapshotOwnProperties(GetOptionsObject(options), null);

if (IsObject(item)) {
Expand Down Expand Up @@ -1865,9 +1880,21 @@ export function ToTemporalZonedDateTime(
item: ZonedDateTimeParams['from'][0],
options?: ZonedDateTimeParams['from'][1]
) {
let year, month, day, hour, minute, second, millisecond, microsecond, nanosecond, timeZone, offset, calendar;
let year: number,
month: number,
day: number,
hour: number,
minute: number,
second: number,
millisecond: number,
microsecond: number,
nanosecond: number,
timeZone,
offset: string | undefined,
calendar: string | Temporal.CalendarProtocol | undefined;
const resolvedOptions = SnapshotOwnProperties(GetOptionsObject(options), null);
let disambiguation, offsetOpt;
let disambiguation: NonNullable<Temporal.ToInstantOptions['disambiguation']>;
let offsetOpt: NonNullable<Temporal.OffsetDisambiguationOptions['offset']>;
let matchMinute = false;
let offsetBehaviour: OffsetBehaviour = 'option';
if (IsObject(item)) {
Expand Down Expand Up @@ -2771,7 +2798,7 @@ export function GetOffsetStringFor(timeZone: string | Temporal.TimeZoneProtocol,
return FormatUTCOffsetNanoseconds(offsetNs);
}

export function FormatUTCOffsetNanoseconds(offsetNs: number) {
export function FormatUTCOffsetNanoseconds(offsetNs: number): string {
const sign = offsetNs < 0 ? '-' : '+';
const absoluteNs = MathAbs(offsetNs);
const hour = MathFloor(absoluteNs / 3600e9);
Expand Down Expand Up @@ -2970,8 +2997,8 @@ function GetPossibleInstantsFor(
export function ISOYearString(year: number) {
let yearString;
if (year < 0 || year > 9999) {
let sign = year < 0 ? '-' : '+';
let yearNumber = MathAbs(year);
const sign = year < 0 ? '-' : '+';
const yearNumber = MathAbs(year);
yearString = sign + ToZeroPaddedDecimalString(yearNumber, 6);
} else {
yearString = ToZeroPaddedDecimalString(year, 4);
Expand All @@ -2986,7 +3013,7 @@ export function ISODateTimePartString(part: number) {
function FormatFractionalSeconds(
subSecondNanoseconds: number,
precision: Exclude<SecondsStringPrecisionRecord['precision'], 'minute'>
) {
): string {
let fraction;
if (precision === 'auto') {
if (subSecondNanoseconds === 0) return '';
Expand All @@ -3007,7 +3034,7 @@ export function FormatTimeString(
second: number,
subSecondNanoseconds: number,
precision: SecondsStringPrecisionRecord['precision']
) {
): string {
let result = `${ISODateTimePartString(hour)}:${ISODateTimePartString(minute)}`;
if (precision === 'minute') return result;

Expand Down Expand Up @@ -3039,7 +3066,7 @@ interface ToStringOptions {
roundingMode: ReturnType<typeof ToTemporalRoundingMode>;
}

function formatAsDecimalNumber(num: number | JSBI) {
function formatAsDecimalNumber(num: number | JSBI): string {
if (typeof num === 'number' && num <= NumberMaxSafeInteger) return num.toString(10);
return JSBI.BigInt(num).toString();
}
Expand Down Expand Up @@ -3223,7 +3250,7 @@ export function IsOffsetTimeZoneIdentifier(string: string): boolean {
return OFFSET.test(string);
}

export function ParseDateTimeUTCOffset(string: string) {
export function ParseDateTimeUTCOffset(string: string): number {
const match = OFFSET_WITH_PARTS.exec(string);
if (!match) {
throw new RangeError(`invalid time zone offset: ${string}`);
Expand Down Expand Up @@ -3351,7 +3378,7 @@ export function GetNamedTimeZoneOffsetNanoseconds(id: string, epochNanoseconds:
return JSBI.toNumber(JSBI.subtract(utc, epochNanoseconds));
}

export function FormatOffsetTimeZoneIdentifier(offsetMinutes: number) {
export function FormatOffsetTimeZoneIdentifier(offsetMinutes: number): string {
const sign = offsetMinutes < 0 ? '-' : '+';
const absoluteMinutes = MathAbs(offsetMinutes);
const hour = MathFloor(absoluteMinutes / 60);
Expand All @@ -3360,7 +3387,7 @@ export function FormatOffsetTimeZoneIdentifier(offsetMinutes: number) {
return `${sign}${timeString}`;
}

function FormatDateTimeUTCOffsetRounded(offsetNanosecondsParam: number) {
function FormatDateTimeUTCOffsetRounded(offsetNanosecondsParam: number): string {
const offsetNanoseconds = JSBI.toNumber(
RoundNumberToIncrement(JSBI.BigInt(offsetNanosecondsParam), MINUTE_NANOS, 'halfExpand')
);
Expand Down

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