diff --git a/src/describe.ts b/src/describe.ts
index d3ecba2..ce4d584 100644
--- a/src/describe.ts
+++ b/src/describe.ts
@@ -26,7 +26,7 @@ function detectStep(values: number[], spec: FieldSpec): number | null {
   return step;
 }
 
-export function describeTime(cron: CronExpression): string {
+function describeTime(cron: CronExpression): string {
   const m = cron.minute;
   const h = cron.hour;
   const mSpec = specFor(m);
@@ -57,7 +57,7 @@ export function describeTime(cron: CronExpression): string {
   return hourPart ? `${minutePart}, ${hourPart}` : minutePart;
 }
 
-export function describeDays(cron: CronExpression): string {
+function describeDays(cron: CronExpression): string {
   const dom = cron.dayOfMonth;
   const dow = cron.dayOfWeek;
   const domSpec = specFor(dom);
@@ -80,7 +80,7 @@ export function describeDays(cron: CronExpression): string {
   return parts.join(" and ");
 }
 
-export function describeMonths(cron: CronExpression): string {
+function describeMonths(cron: CronExpression): string {
   const m = cron.month;
   const spec = specFor(m);
   if (isFullRange(m.values, spec)) return "";
diff --git a/src/fields.ts b/src/fields.ts
index bf34c8a..e39b5cc 100644
--- a/src/fields.ts
+++ b/src/fields.ts
@@ -37,13 +37,13 @@ export const ALIASES: Record<string, string> = {
 export const MONTH_LABELS = ["", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
 export const DAY_LABELS = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
 
-export function fieldByName(name: FieldName): FieldSpec {
+function fieldByName(name: FieldName): FieldSpec {
   const f = FIELDS.find((x) => x.name === name);
   if (!f) throw new Error(`unknown field ${name}`);
   return f;
 }
 
-export function rangeOf(spec: FieldSpec): number[] {
+function rangeOf(spec: FieldSpec): number[] {
   const out: number[] = [];
   for (let i = spec.min; i <= spec.max; i++) out.push(i);
   return out;
diff --git a/src/next.ts b/src/next.ts
index d7a3564..98d85e2 100644
--- a/src/next.ts
+++ b/src/next.ts
@@ -110,7 +110,7 @@ export function occurrencesBetween(cron: CronExpression, start: Date, end: Date,
   return out;
 }
 
-export function toOccurrence(date: Date): Occurrence {
+function toOccurrence(date: Date): Occurrence {
   return { date, iso: date.toISOString() };
 }
 
diff --git a/src/parse.ts b/src/parse.ts
index 751ceb3..9655efd 100644
--- a/src/parse.ts
+++ b/src/parse.ts
@@ -68,7 +68,7 @@ function expandRange(part: string, spec: FieldSpec): number[] {
   return out;
 }
 
-export function parseField(raw: string, spec: FieldSpec): ParsedField {
+function parseField(raw: string, spec: FieldSpec): ParsedField {
   if (!raw) throw new CronParseError("empty field", spec.name);
   const set = new Set<number>();
   for (const part of raw.split(",")) {
@@ -127,5 +127,5 @@ export function stringify(cron: CronExpression): string {
   return [cron.minute, cron.hour, cron.dayOfMonth, cron.month, cron.dayOfWeek].map((f) => f.raw).join(" ");
 }
 
-export const knownMonthNames = Object.keys(MONTH_NAMES);
-export const knownDayNames = Object.keys(DAY_NAMES);
+const knownMonthNames = Object.keys(MONTH_NAMES);
+const knownDayNames = Object.keys(DAY_NAMES);