60 lines
2.1 KiB
TypeScript
60 lines
2.1 KiB
TypeScript
type Value = any;
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type ErrorMessage = false | string;
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type FieldValues = { [key: string]: Value };
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type Validator = (value: Value, fieldValues?: FieldValues) => ErrorMessage;
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type FieldValidators = { [key: string]: Validator | Validator[] };
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type FieldErrors = { [key: string]: string };
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const is = {
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match: (testFn: Function, message = '') => (
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value: Value,
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fieldValues: FieldValues,
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): ErrorMessage => !testFn(value, fieldValues) && message,
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required: () => (value: Value): ErrorMessage =>
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isNilOrEmptyString(value) && 'This field is required',
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minLength: (min: number) => (value: Value): ErrorMessage =>
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!!value && value.length < min && `Must be at least ${min} characters`,
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maxLength: (max: number) => (value: Value): ErrorMessage =>
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!!value && value.length > max && `Must be at most ${max} characters`,
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oneOf: (arr: any[]) => (value: Value): ErrorMessage =>
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!!value && !arr.includes(value) && `Must be one of: ${arr.join(', ')}`,
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notEmptyArray: () => (value: Value): ErrorMessage =>
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Array.isArray(value) && value.length === 0 && 'Please add at least one item',
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email: () => (value: Value): ErrorMessage =>
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!!value && !/.+@.+\..+/.test(value) && 'Must be a valid email',
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url: () => (value: Value): ErrorMessage =>
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!!value &&
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// eslint-disable-next-line no-useless-escape
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!/^(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$/.test(value) &&
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'Must be a valid URL',
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};
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const isNilOrEmptyString = (value: Value): boolean =>
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value === undefined || value === null || value === '';
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export const generateErrors = (
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fieldValues: FieldValues,
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fieldValidators: FieldValidators,
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): FieldErrors => {
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const fieldErrors: FieldErrors = {};
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Object.entries(fieldValidators).forEach(([fieldName, validators]) => {
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[validators].flat().forEach(validator => {
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const errorMessage = validator(fieldValues[fieldName], fieldValues);
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if (errorMessage !== false && !fieldErrors[fieldName]) {
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fieldErrors[fieldName] = errorMessage;
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}
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});
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});
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return fieldErrors;
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};
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export default is;
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