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✨ Quality: Improve robustness - string transformations #83

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Merged
galiprandi merged 1 commit into from
Jun 6, 2026
Merged

✨ Quality: Improve robustness - string transformations #83

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6 changes: 6 additions & 0 deletions lib/utilities/strings.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,13 +37,19 @@ describe('valueTransforms', () => {
expect(valueTransforms('hello world', 'camelCase')).toBe('helloWorld')
expect(valueTransforms('hello-world', 'camelCase')).toBe('helloWorld')
expect(valueTransforms('hello_world', 'camelCase')).toBe('helloWorld')
expect(valueTransforms(' hello world ', 'camelCase')).toBe(
'helloWorld',
)
})

it('should transform to pascal case', () => {
expect(valueTransforms('hello world', 'pascalCase')).toBe('HelloWorld')
expect(valueTransforms('hello-world', 'pascalCase')).toBe('HelloWorld')
expect(valueTransforms('hello_world', 'pascalCase')).toBe('HelloWorld')
expect(valueTransforms('helloWorld', 'pascalCase')).toBe('HelloWorld')
expect(valueTransforms(' hello world ', 'pascalCase')).toBe(
'HelloWorld',
)
})

it('should transform to kebab case', () => {
Expand Down
183 changes: 95 additions & 88 deletions lib/utilities/strings.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2,19 +2,19 @@
* Available transformation types for strings.
*/
export type TransformType =
| "toUpperCase"
| "toLowerCase"
| "capitalize"
| "titleCase"
| "snakeCase"
| "camelCase"
| "pascalCase"
| "kebabCase"
| "onlyNumbers"
| "onlyLetters"
| "onlyEmail"
| "onlyAlphanumeric"
| "slugify";
| 'toUpperCase'
| 'toLowerCase'
| 'capitalize'
| 'titleCase'
| 'snakeCase'
| 'camelCase'
| 'pascalCase'
| 'kebabCase'
| 'onlyNumbers'
| 'onlyLetters'
| 'onlyEmail'
| 'onlyAlphanumeric'
| 'slugify'

/**
* Transforms a string based on the specified transformation type.
Expand Down Expand Up @@ -42,82 +42,89 @@ export type TransformType =
* ```
*/
export const valueTransforms = (
value: string,
transform?: TransformType | TransformType[],
value: string,
transform?: TransformType | TransformType[],
): string => {
const applyTransform = (val: string, t: string): string => {
switch (t) {
case "toUpperCase":
return val.toUpperCase();
case "toLowerCase":
return val.toLowerCase();
case "capitalize": {
const trimmed = val.trim();
return trimmed.charAt(0).toUpperCase() + trimmed.slice(1).toLowerCase();
}
case "titleCase":
return val
.replace(/([a-z])([A-Z])/g, "$1 $2")
.replace(/[_-]/g, " ")
.toLowerCase()
.trim()
.replace(/\s+/g, " ")
.replace(/\b\w/g, (ch) => ch.toUpperCase());
case "snakeCase":
return val
.replace(/([a-z])([A-Z])/g, "$1 $2")
.replace(/[_-]/g, " ")
.toLowerCase()
.trim()
.replace(/\s+/g, "_");
case "camelCase":
return val
.replace(/([a-z])([A-Z])/g, "$1 $2")
.replace(/[_-]/g, " ")
.toLowerCase()
.replace(/(?:^\w|[A-Z]|\b\w)/g, (word, index) =>
index === 0 ? word.toLowerCase() : word.toUpperCase(),
)
.replace(/\s+/g, "");
case "pascalCase":
return val
.replace(/([a-z])([A-Z])/g, "$1 $2")
.replace(/[_-]/g, " ")
.toLowerCase()
.replace(/(?:^\w|[A-Z]|\b\w)/g, (word) => word.toUpperCase())
.replace(/\s+/g, "");
case "kebabCase":
return val
.replace(/([a-z])([A-Z])/g, "$1 $2")
.replace(/[_-]/g, " ")
.toLowerCase()
.trim()
.replace(/\s+/g, "-");
case "onlyNumbers":
return val.replace(/\D/g, "");
case "onlyLetters":
return val.replace(/[^a-zA-Z]/g, "");
case "onlyEmail":
return val.replace(/[^a-zA-Z0-9@._-]/g, "");
case "onlyAlphanumeric":
return val.replace(/[^a-zA-Z0-9]/g, "");
case "slugify":
return val
.normalize("NFD")
.replace(/[\u0300-\u036f]/g, "")
.toLowerCase()
.trim()
.replace(/[^a-z0-9\s_-]/g, "")
.replace(/[\s_-]+/g, "-")
.replace(/^-+|-+$/g, "");
default:
return val;
const applyTransform = (val: string, t: string): string => {
switch (t) {
case 'toUpperCase':
return val.toUpperCase()
case 'toLowerCase':
return val.toLowerCase()
case 'capitalize': {
const trimmed = val.trim()
return (
trimmed.charAt(0).toUpperCase() +
trimmed.slice(1).toLowerCase()
)
}
case 'titleCase':
return val
.replace(/([a-z])([A-Z])/g, '$1 $2')
.replace(/[_-]/g, ' ')
.toLowerCase()
.trim()
.replace(/\s+/g, ' ')
.replace(/\b\w/g, (ch) => ch.toUpperCase())
case 'snakeCase':
return val
.replace(/([a-z])([A-Z])/g, '$1 $2')
.replace(/[_-]/g, ' ')
.toLowerCase()
.trim()
.replace(/\s+/g, '_')
case 'camelCase':
return val
.replace(/([a-z])([A-Z])/g, '$1 $2')
.replace(/[_-]/g, ' ')
.toLowerCase()
.trim()
.replace(/(?:^\w|[A-Z]|\b\w)/g, (word, index) =>
index === 0 ? word.toLowerCase() : word.toUpperCase(),
)
.replace(/\s+/g, '')
case 'pascalCase':
return val
.replace(/([a-z])([A-Z])/g, '$1 $2')
.replace(/[_-]/g, ' ')
.toLowerCase()
.trim()
.replace(/(?:^\w|[A-Z]|\b\w)/g, (word) =>
word.toUpperCase(),
)
.replace(/\s+/g, '')
case 'kebabCase':
return val
.replace(/([a-z])([A-Z])/g, '$1 $2')
.replace(/[_-]/g, ' ')
.toLowerCase()
.trim()
.replace(/\s+/g, '-')
case 'onlyNumbers':
return val.replace(/\D/g, '')
case 'onlyLetters':
return val.replace(/[^a-zA-Z]/g, '')
case 'onlyEmail':
return val.replace(/[^a-zA-Z0-9@._-]/g, '')
case 'onlyAlphanumeric':
return val.replace(/[^a-zA-Z0-9]/g, '')
case 'slugify':
return val
.normalize('NFD')
.replace(/[\u0300-\u036f]/g, '')
.toLowerCase()
.trim()
.replace(/[^a-z0-9\s_-]/g, '')
.replace(/[\s_-]+/g, '-')
.replace(/^-+|-+$/g, '')
default:
return val
}
}
};

if (Array.isArray(transform)) {
return transform.reduce((acc, t) => applyTransform(acc, t), value);
}
if (Array.isArray(transform)) {
return transform.reduce((acc, t) => applyTransform(acc, t), value)
}

return transform ? applyTransform(value, transform) : value;
};
return transform ? applyTransform(value, transform) : value
}
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