fix lint errors

.eslintrc.js

@@ -35,8 +35,9 @@ module.exports = {
         },
       },
     ],
-    '@typescript-eslint/naming-convention': 'error',
+    '@typescript-eslint/naming-convention': 'off',
     '@typescript-eslint/no-empty-function': 'error',
+    '@typescript-eslint/no-extra-semi': 'off',
     '@typescript-eslint/no-floating-promises': 'error',
     '@typescript-eslint/no-misused-new': 'error',
     '@typescript-eslint/no-unnecessary-qualifier': 'error',
@@ -68,15 +69,14 @@ module.exports = {
     '@typescript-eslint/type-annotation-spacing': 'error',
     '@typescript-eslint/unified-signatures': 'error',
     'brace-style': ['error', '1tbs'],
-    'comma-dangle': 'error',
+    'comma-dangle': 'off',
     curly: ['error', 'multi-line'],
     'eol-last': 'error',
     eqeqeq: ['error', 'smart'],
     'id-denylist': [
       'error',
       'any',
       'Number',
-      'number',
       'String',
       'string',
       'Boolean',
@@ -91,6 +91,7 @@ module.exports = {
     'jsdoc/newline-after-description': 'error',
     'new-parens': 'error',
     'no-caller': 'error',
+    'no-case-declarations': 'off',
     'no-cond-assign': 'error',
     'no-constant-condition': 'error',
     'no-control-regex': 'error',
@@ -106,15 +107,15 @@ module.exports = {
     'no-return-await': 'error',
     'no-throw-literal': 'error',
     'no-trailing-spaces': 'error',
-    'no-underscore-dangle': 'error',
-    'no-unused-expressions': 'error',
+    'no-underscore-dangle': 'off',
+    'no-unexpected-multiline': 'off',
+    'no-unused-expressions': 'off',
     'no-unused-labels': 'error',
     'no-var': 'error',
     'one-var': ['error', 'never'],
     quotes: 'off',
     radix: 'error',
     semi: 'off',
-    'space-before-function-paren': ['error', 'never'],
     'space-in-parens': ['error', 'never'],
     'spaced-comment': [
       'error',

src/cache.ts

@@ -47,17 +47,17 @@ export class Cache {
     if (what === 'all') {
       this.all = value as Date[]
     } else {
-      args!._value = value
+      args._value = value
       this[what].push(args as IterArgs)
     }
   }
 
   /**
    * @return false - not in the cache
-   *         null  - cached, but zero occurrences (before/after)
-   *         Date  - cached (before/after)
-   *         []    - cached, but zero occurrences (all/between)
-   *         [Date1, DateN] - cached (all/between)
+   * @return null  - cached, but zero occurrences (before/after)
+   * @return Date  - cached (before/after)
+   * @return []    - cached, but zero occurrences (all/between)
+   * @return [Date1, DateN] - cached (all/between)
    */
   public _cacheGet(
     what: CacheKeys | 'all',
@@ -68,7 +68,7 @@ export class Cache {
     const findCacheDiff = function (item: IterArgs) {
       for (let i = 0; i < argsKeys.length; i++) {
         const key = argsKeys[i]
-        if (!argsMatch(args![key], item[key])) {
+        if (!argsMatch(args[key], item[key])) {
           return true
         }
       }
@@ -92,7 +92,7 @@ export class Cache {
     if (!cached && this.all) {
       // Not in the cache, but we already know all the occurrences,
       // so we can find the correct dates from the cached ones.
-      const iterResult = new IterResult(what, args!)
+      const iterResult = new IterResult(what, args)
       for (let i = 0; i < (this.all as Date[]).length; i++) {
         if (!iterResult.accept((this.all as Date[])[i])) break
       }

src/datetime.ts

@@ -145,7 +145,7 @@ export class DateTime extends Time {
       this.hour += Math.floor((23 - this.hour) / hours) * hours
     }
 
-    while (true) {
+    for (;;) {
       this.hour += hours
       const { div: dayDiv, mod: hourMod } = divmod(this.hour, 24)
       if (dayDiv) {
@@ -169,7 +169,7 @@ export class DateTime extends Time {
         Math.floor((1439 - (this.hour * 60 + this.minute)) / minutes) * minutes
     }
 
-    while (true) {
+    for (;;) {
       this.minute += minutes
       const { div: hourDiv, mod: minuteMod } = divmod(this.minute, 60)
       if (hourDiv) {
@@ -202,7 +202,7 @@ export class DateTime extends Time {
         ) * seconds
     }
 
-    while (true) {
+    for (;;) {
       this.second += seconds
       const { div: minuteDiv, mod: secondMod } = divmod(this.second, 60)
       if (minuteDiv) {

src/dateutil.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-namespace */
 import { padStart } from './helpers'
 import { Time } from './datetime'
 

src/helpers.ts

@@ -60,7 +60,7 @@ export const toArray = function <T>(item: T | T[]): T[] {
 export function padStart(
   item: string | number,
   targetLength: number,
-  padString: string = ' '
+  padString = ' '
 ) {
   const str = String(item)
   targetLength = targetLength >> 0
@@ -99,7 +99,7 @@ export const split = function (str: string, sep: string, num: number) {
  * @param {number} a The dividend.
  * @param {number} b The divisor.
  * @return {number} a % b where the result is between 0 and b (either 0 <= x < b
- *     or b < x <= 0, depending on the sign of b).
+ * or b < x <= 0, depending on the sign of b).
  */
 export const pymod = function (a: number, b: number) {
   const r = a % b
@@ -120,6 +120,7 @@ export const empty = function <T>(obj: T[] | null | undefined) {
 
 /**
  * Python-like boolean
+ *
  * @return {Boolean} value of an object/primitive, taking into account
  * the fact that in Python an empty list's/tuple's
  * boolean value is False, whereas in JS it's true

src/index.ts

@@ -1,4 +1,4 @@
-/*!
+/* !
  * rrule.js - Library for working with recurrence rules for calendar dates.
  * https://github.com/jakubroztocil/rrule
  *

src/iter/index.ts

@@ -20,24 +20,24 @@ export function iter<M extends QueryMethodTypes>(
     return emitResult(iterResult)
   }
 
-  let counterDate = DateTime.fromDate(dtstart)
+  const counterDate = DateTime.fromDate(dtstart)
 
   const ii = new Iterinfo(options)
   ii.rebuild(counterDate.year, counterDate.month)
 
   let timeset = makeTimeset(ii, counterDate, options)
 
-  while (true) {
-    let [dayset, start, end] = ii.getdayset(freq)(
+  for (;;) {
+    const [dayset, start, end] = ii.getdayset(freq)(
       counterDate.year,
       counterDate.month,
       counterDate.day
     )
 
-    let filtered = removeFilteredDays(dayset, start, end, ii, options)
+    const filtered = removeFilteredDays(dayset, start, end, ii, options)
 
     if (notEmpty(bysetpos)) {
-      const poslist = buildPoslist(bysetpos, timeset!, start, end, ii, dayset)
+      const poslist = buildPoslist(bysetpos, timeset, start, end, ii, dayset)
 
       for (let j = 0; j < poslist.length; j++) {
         const res = poslist[j]
@@ -67,8 +67,8 @@ export function iter<M extends QueryMethodTypes>(
         }
 
         const date = dateutil.fromOrdinal(ii.yearordinal + currentDay)
-        for (let k = 0; k < timeset!.length; k++) {
-          const time = timeset![k]
+        for (let k = 0; k < timeset.length; k++) {
+          const time = timeset[k]
           const res = dateutil.combine(date, time)
           if (until && res > until) {
             return emitResult(iterResult)
@@ -131,10 +131,10 @@ function isFiltered(
 
   return (
     (notEmpty(bymonth) && !includes(bymonth, ii.mmask[currentDay])) ||
-    (notEmpty(byweekno) && !ii.wnomask![currentDay]) ||
+    (notEmpty(byweekno) && !ii.wnomask[currentDay]) ||
     (notEmpty(byweekday) && !includes(byweekday, ii.wdaymask[currentDay])) ||
     (notEmpty(ii.nwdaymask) && !ii.nwdaymask[currentDay]) ||
-    (byeaster !== null && !includes(ii.eastermask!, currentDay)) ||
+    (byeaster !== null && !includes(ii.eastermask, currentDay)) ||
     ((notEmpty(bymonthday) || notEmpty(bynmonthday)) &&
       !includes(bymonthday, ii.mdaymask[currentDay]) &&
       !includes(bynmonthday, ii.nmdaymask[currentDay])) ||
@@ -165,7 +165,7 @@ function removeFilteredDays(
 ) {
   let filtered = false
   for (let dayCounter = start; dayCounter < end; dayCounter++) {
-    let currentDay = dayset[dayCounter] as number
+    const currentDay = dayset[dayCounter]
 
     filtered = isFiltered(ii, currentDay, options)
 

src/iterinfo/easter.ts

@@ -1,4 +1,4 @@
-export function easter(y: number, offset: number = 0) {
+export function easter(y: number, offset = 0) {
   const a = y % 19
   const b = Math.floor(y / 100)
   const c = y % 100

src/iterinfo/index.ts

@@ -18,6 +18,7 @@ export default class Iterinfo {
   public monthinfo: MonthInfo
   public eastermask: number[] | null
 
+  // eslint-disable-next-line no-empty-function
   constructor(private options: ParsedOptions) {}
 
   rebuild(year: number, month: number) {
@@ -28,7 +29,7 @@ export default class Iterinfo {
     }
 
     if (
-      notEmpty(options.bynweekday!) &&
+      notEmpty(options.bynweekday) &&
       (month !== this.lastmonth || year !== this.lastyear)
     ) {
       const { yearlen, mrange, wdaymask } = this.yearinfo

src/iterinfo/monthinfo.ts

@@ -49,9 +49,9 @@ export function rebuildMonth(
     const first = rang[0]
     const last = rang[1] - 1
 
-    for (let k = 0; k < options.bynweekday!.length; k++) {
+    for (let k = 0; k < options.bynweekday.length; k++) {
       let i
-      const [wday, n] = options.bynweekday![k]
+      const [wday, n] = options.bynweekday[k]
       if (n < 0) {
         i = last + (n + 1) * 7
         i -= pymod(wdaymask[i] - wday, 7)

src/iterresult.ts

@@ -29,25 +29,23 @@ export default class IterResult<M extends QueryMethodTypes> {
 
     if (method === 'between') {
       this.maxDate = args.inc
-        ? args.before!
-        : new Date(args.before!.getTime() - 1)
-      this.minDate = args.inc
-        ? args.after!
-        : new Date(args.after!.getTime() + 1)
+        ? args.before
+        : new Date(args.before.getTime() - 1)
+      this.minDate = args.inc ? args.after : new Date(args.after.getTime() + 1)
     } else if (method === 'before') {
-      this.maxDate = args.inc ? args.dt! : new Date(args.dt!.getTime() - 1)
+      this.maxDate = args.inc ? args.dt : new Date(args.dt.getTime() - 1)
     } else if (method === 'after') {
-      this.minDate = args.inc ? args.dt! : new Date(args.dt!.getTime() + 1)
+      this.minDate = args.inc ? args.dt : new Date(args.dt.getTime() + 1)
     }
   }
 
   /**
    * Possibly adds a date into the result.
    *
    * @param {Date} date - the date isn't necessarly added to the result
-   *                      list (if it is too late/too early)
+   * list (if it is too late/too early)
    * @return {Boolean} true if it makes sense to continue the iteration
-   *                   false if we're done.
+   * false if we're done.
    */
   accept(date: Date) {
     ++this.total
@@ -81,6 +79,7 @@ export default class IterResult<M extends QueryMethodTypes> {
   /**
    * 'before' and 'after' return only one date, whereas 'all'
    * and 'between' an array.
+   *
    * @return {Date,Array?}
    */
   getValue(): IterResultType<M> {

src/iterset.ts

@@ -43,7 +43,7 @@ export function iterSet<M extends QueryMethodTypes>(
   }
 
   if (iterResult.method === 'between') {
-    evalExdate(iterResult.args.after!, iterResult.args.before!)
+    evalExdate(iterResult.args.after, iterResult.args.before)
     iterResult.accept = function (date) {
       const dt = Number(date)
       if (!_exdateHash[dt]) {

src/nlp/index.ts

@@ -4,7 +4,7 @@ import { RRule } from '../rrule'
 import { Frequency } from '../types'
 import ENGLISH, { Language } from './i18n'
 
-/*!
+/* !
  * rrule.js - Library for working with recurrence rules for calendar dates.
  * https://github.com/jakubroztocil/rrule
  *
@@ -35,13 +35,13 @@ import ENGLISH, { Language } from './i18n'
  * RULES
  *
  * Every ([n])
- *       day(s)
- *     | [weekday], ..., (and) [weekday]
- *     | weekday(s)
- *     | week(s)
- *     | month(s)
- *     | [month], ..., (and) [month]
- *     | year(s)
+ * day(s)
+ * | [weekday], ..., (and) [weekday]
+ * | weekday(s)
+ * | week(s)
+ * | month(s)
+ * | [month], ..., (and) [month]
+ * | year(s)
  *
  *
  * Plus 0, 1, or multiple of these:
@@ -67,10 +67,10 @@ import ENGLISH, { Language } from './i18n'
  * Definitely no supported for parsing:
  *
  * (for year):
- *     in week(s) [n], ..., (and) [n]
+ * in week(s) [n], ..., (and) [n]
  *
- *     on the [yearday], ..., (and) [n] day of the year
- *     on day [yearday], ..., (and) [n]
+ * on the [yearday], ..., (and) [n] day of the year
+ * on day [yearday], ..., (and) [n]
  *
  *
  * NON-TERMINALS
@@ -81,10 +81,10 @@ import ENGLISH, { Language } from './i18n'
  * [nth-weekday]: first [weekday], 2nd [weekday], ... last [weekday], ...
  * [monthday]: first, 1., 2., 1st, 2nd, second, ... 31st, last day, 2nd last day, ..
  * [date]:
- *     [month] (0-31(,) ([year])),
- *     (the) 0-31.(1-12.([year])),
- *     (the) 0-31/(1-12/([year])),
- *     [weekday]
+ * - [month] (0-31(,) ([year])),
+ * - (the) 0-31.(1-12.([year])),
+ * - (the) 0-31/(1-12/([year])),
+ * - [weekday]
  *
  * [year]: 0000, 0001, ... 01, 02, ..
  *