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TypeScript Pascal Case to Screaming Snake Case
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| type PascalToScreamingSnake<T extends string, TInit = true, TMulti = false> = T extends `${infer Head}${infer Rest}` | |
| ? `${ | |
| TInit extends true | |
| ? Uppercase<Head> | |
| : Head extends Uppercase<Head> | |
| ? TMulti extends false | |
| ? `_${Head}` | |
| : Rest extends `${infer Next}${string}` | |
| ? Next extends Uppercase<Next> | |
| ? Head | |
| : `_${Head}` | |
| : Head | |
| : Uppercase<Head> | |
| }${PascalToScreamingSnake<Rest, false, Head extends Uppercase<Head> ? true : false>}` | |
| : '' | |
| // PascalToScreamingSnake<'thisISDifficult'> -> THIS_IS_DIFFICULT | |
| // PascalToScreamingSnake<'thisISNT'> -> THIS_ISNT | |
| // PascalToScreamingSnake<'somethingEasyLikeThis'> -> SOMETHING_EASY_LIKE_THIS |
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| // equivalent js, ugly iife coz ts and ternaries are ugly too | |
| /** @param {string} T */ | |
| function PascalToCamelCase(T, TInit = true, TMulti = false) { | |
| if (T !== '') { | |
| const [Head, Rest = ''] = [T[0], T.slice(1)] | |
| return `${(() => { | |
| if (TInit === true) { | |
| return Uppercase(Head) | |
| } else { | |
| if (Head === Uppercase(Head)) { | |
| if (TMulti === false) { | |
| return `_${Head}` | |
| } else { | |
| if (Rest !== '') { | |
| const Next = Rest[0] | |
| if (Next === Uppercase(Next)) { | |
| return Head | |
| } else { | |
| return `_${Head}` | |
| } | |
| } else { | |
| return Head | |
| } | |
| } | |
| } else { | |
| return Uppercase(Head) | |
| } | |
| } | |
| })()}${PascalToCamelCase(Rest, false, Head === Uppercase(Head))}` | |
| } else { | |
| return '' | |
| } | |
| } |
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