chore: change functions to constants

Author: jaworek

src/__tests__/characterClasses.test.tsx

@@ -3,33 +3,33 @@ import { buildPattern } from '../compiler';
 import { one } from '../quantifiers';
 
 test('"whitespace" character class', () => {
-  expect(buildPattern(whitespace())).toEqual(`\\s`);
+  expect(buildPattern(whitespace)).toEqual(`\\s`);
 
-  expect(buildPattern(one('ab'), whitespace())).toEqual(`ab\\s`);
+  expect(buildPattern(one('ab'), whitespace)).toEqual(`ab\\s`);
 
-  expect(buildPattern(one('ab'), whitespace(), one('c'))).toEqual(`ab\\sc`);
+  expect(buildPattern(one('ab'), whitespace, one('c'))).toEqual(`ab\\sc`);
 });
 
 test('"digit" character class', () => {
-  expect(buildPattern(digit())).toEqual(`\\d`);
+  expect(buildPattern(digit)).toEqual(`\\d`);
 
-  expect(buildPattern(one('ab'), digit())).toEqual(`ab\\d`);
+  expect(buildPattern(one('ab'), digit)).toEqual(`ab\\d`);
 
-  expect(buildPattern(one('ab'), digit(), one('c'))).toEqual(`ab\\dc`);
+  expect(buildPattern(one('ab'), digit, one('c'))).toEqual(`ab\\dc`);
 });
 
 test('"word" character class', () => {
-  expect(buildPattern(word())).toEqual(`\\w`);
+  expect(buildPattern(word)).toEqual(`\\w`);
 
-  expect(buildPattern(one('ab'), word())).toEqual(`ab\\w`);
+  expect(buildPattern(one('ab'), word)).toEqual(`ab\\w`);
 
-  expect(buildPattern(one('ab'), word(), one('c'))).toEqual(`ab\\wc`);
+  expect(buildPattern(one('ab'), word, one('c'))).toEqual(`ab\\wc`);
 });
 
 test('"any" character class', () => {
-  expect(buildPattern(any())).toEqual(`.`);
+  expect(buildPattern(any)).toEqual(`.`);
 
-  expect(buildPattern(one('ab'), any())).toEqual(`ab.`);
+  expect(buildPattern(one('ab'), any)).toEqual(`ab.`);
 
-  expect(buildPattern(one('ab'), any(), one('c'))).toEqual(`ab.c`);
+  expect(buildPattern(one('ab'), any, one('c'))).toEqual(`ab.c`);
 });

src/characterClasses.ts

@@ -1,21 +1,13 @@
 import type { Any, Digit, Whitespace, Word } from './types';
 import type { CompilerMap } from './types-internal';
 
-export function whitespace(): Whitespace {
-  return { type: 'whitespace' };
-}
+export const whitespace: Whitespace = { type: 'whitespace' };
 
-export function digit(): Digit {
-  return { type: 'digit' };
-}
+export const digit: Digit = { type: 'digit' };
 
-export function word(): Word {
-  return { type: 'word' };
-}
+export const word: Word = { type: 'word' };
 
-export function any(): Any {
-  return { type: 'any' };
-}
+export const any: Any = { type: 'any' };
 
 export const compilers = {
   whitespace: '\\s',