diff --git a/src/locales/de/index.ts b/src/locales/de/index.ts
index c784df97..26fbd387 100644
--- a/src/locales/de/index.ts
+++ b/src/locales/de/index.ts
@@ -22,11 +22,11 @@ export { Component, ParsedResult, ParsingOption, ParsingReference, Meridiem, Wee
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration(true));
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/en/index.ts b/src/locales/en/index.ts
index 1cd342b7..cafe1c0e 100644
--- a/src/locales/en/index.ts
+++ b/src/locales/en/index.ts
@@ -33,13 +33,13 @@ export const GB = new Chrono(configuration.createCasualConfiguration(true));
 /**
  * A shortcut for en.casual.parse()
  */
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
 /**
  * A shortcut for en.casual.parseDate()
  */
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
diff --git a/src/locales/es/index.ts b/src/locales/es/index.ts
index ffce0f9c..24d5d078 100644
--- a/src/locales/es/index.ts
+++ b/src/locales/es/index.ts
@@ -25,11 +25,11 @@ export { Component, ParsedResult, ParsingOption, ParsingReference, Meridiem, Wee
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration(true));
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/fr/index.ts b/src/locales/fr/index.ts
index 21122a80..9552e9f3 100644
--- a/src/locales/fr/index.ts
+++ b/src/locales/fr/index.ts
@@ -28,11 +28,11 @@ export { Component, ParsedResult, ParsingOption, ParsingReference, Meridiem, Wee
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration(true));
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/ja/index.ts b/src/locales/ja/index.ts
index d0da5c5c..6b8f1945 100644
--- a/src/locales/ja/index.ts
+++ b/src/locales/ja/index.ts
@@ -19,11 +19,11 @@ export { Component, ParsedResult, ParsingOption, ParsingReference, Meridiem, Wee
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration());
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/nl/index.ts b/src/locales/nl/index.ts
index f5ea9897..83b8754f 100644
--- a/src/locales/nl/index.ts
+++ b/src/locales/nl/index.ts
@@ -33,11 +33,11 @@ export { Component, ParsedResult, ParsingOption, ParsingReference, Meridiem, Wee
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration(true));
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/nl/parsers/NLRelativeDateFormatParser.ts b/src/locales/nl/parsers/NLRelativeDateFormatParser.ts
index 7b690acc..e6e064db 100644
--- a/src/locales/nl/parsers/NLRelativeDateFormatParser.ts
+++ b/src/locales/nl/parsers/NLRelativeDateFormatParser.ts
@@ -7,7 +7,7 @@ import { matchAnyPattern } from "../../../utils/pattern";
 
 const PATTERN = new RegExp(
     `(dit|deze|(?:aan)?komend|volgend|afgelopen|vorig)e?\\s*(${matchAnyPattern(TIME_UNIT_DICTIONARY)})(?=\\s*)` +
-    "(?=\\W|$)",
+        "(?=\\W|$)",
     "i"
 );
 
diff --git a/src/locales/nl/parsers/NLTimeUnitCasualRelativeFormatParser.ts b/src/locales/nl/parsers/NLTimeUnitCasualRelativeFormatParser.ts
index c4440c19..d4585f7a 100644
--- a/src/locales/nl/parsers/NLTimeUnitCasualRelativeFormatParser.ts
+++ b/src/locales/nl/parsers/NLTimeUnitCasualRelativeFormatParser.ts
@@ -4,7 +4,10 @@ import { ParsingComponents } from "../../../results";
 import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary";
 import { reverseTimeUnits } from "../../../utils/timeunits";
 
-const PATTERN = new RegExp(`(dit|deze|vorig|afgelopen|(?:aan)?komend|over|\\+|-)e?\\s*(${TIME_UNITS_PATTERN})(?=\\W|$)`, "i");
+const PATTERN = new RegExp(
+    `(dit|deze|vorig|afgelopen|(?:aan)?komend|over|\\+|-)e?\\s*(${TIME_UNITS_PATTERN})(?=\\W|$)`,
+    "i"
+);
 
 const PREFIX_WORD_GROUP = 1;
 const TIME_UNIT_WORD_GROUP = 2;
diff --git a/src/locales/pt/index.ts b/src/locales/pt/index.ts
index 9bca6826..e74ea843 100644
--- a/src/locales/pt/index.ts
+++ b/src/locales/pt/index.ts
@@ -24,11 +24,11 @@ export { Component, ParsedResult, ParsingOption, ParsingReference, Meridiem, Wee
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration(true));
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/ru/index.ts b/src/locales/ru/index.ts
index bffec94a..261bb6a7 100644
--- a/src/locales/ru/index.ts
+++ b/src/locales/ru/index.ts
@@ -40,14 +40,14 @@ export const strict = new Chrono(createConfiguration(true));
 /**
  * A shortcut for ru.casual.parse()
  */
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
 /**
  * A shortcut for ru.casual.parseDate()
  */
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/uk/index.ts b/src/locales/uk/index.ts
index 74120c48..a3ded99b 100644
--- a/src/locales/uk/index.ts
+++ b/src/locales/uk/index.ts
@@ -78,13 +78,13 @@ export function createConfiguration(strictMode: boolean): Configuration {
 /**
  * A shortcut for uk.casual.parse()
  */
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
 /**
  * A shortcut for uk.casual.parseDate()
  */
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
diff --git a/src/locales/zh/hans/index.ts b/src/locales/zh/hans/index.ts
index 4f34df78..f5d61b33 100644
--- a/src/locales/zh/hans/index.ts
+++ b/src/locales/zh/hans/index.ts
@@ -25,11 +25,11 @@ export const hans = new Chrono(createCasualConfiguration());
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration());
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }
 
diff --git a/src/locales/zh/hant/index.ts b/src/locales/zh/hant/index.ts
index 4d4544f1..eb619e3a 100644
--- a/src/locales/zh/hant/index.ts
+++ b/src/locales/zh/hant/index.ts
@@ -26,11 +26,11 @@ export const hant = new Chrono(createCasualConfiguration());
 export const casual = new Chrono(createCasualConfiguration());
 export const strict = new Chrono(createConfiguration());
 
-export function parse(text: string, ref?: Date, option?: ParsingOption): ParsedResult[] {
+export function parse(text: string, ref?: ParsingReference | Date, option?: ParsingOption): ParsedResult[] {
     return casual.parse(text, ref, option);
 }
 
-export function parseDate(text: string, ref?: Date, option?: ParsingOption): Date {
+export function parseDate(text: string, ref?: ParsingReference | Date, option?: ParsingOption): Date {
     return casual.parseDate(text, ref, option);
 }