(annotations?: Annotations.Filter): SchemaAST.Filter<string>Validates that a string is unchanged by JavaScript's toLowerCase().
Details
This accepts empty strings and characters that do not have uppercase forms, such as digits, punctuation, and whitespace. It rejects strings that would change when lowercased.
export function function isLowercased(
annotations?: Annotations.Filter
): SchemaAST.Filter<string>
Validates that a string is unchanged by JavaScript's toLowerCase().
Details
This accepts empty strings and characters that do not have uppercase forms,
such as digits, punctuation, and whitespace. It rejects strings that would
change when lowercased.
isLowercased(annotations: Annotations.Filter | undefinedannotations?: Annotations.interface Annotations.FilterAnnotations for filter schema nodes (created via Schema.filter). Extends
Augment
with an optional error message, identifier, and metadata.
Filters are intentionally non-parametric to keep them covariant.
Filter) {
return const makeFilter: <T>(
filter: (
input: T,
ast: SchemaAST.AST,
options: SchemaAST.ParseOptions
) => FilterOutput,
annotations?: Annotations.Filter | undefined,
abort?: boolean
) => SchemaAST.Filter<T>
Creates a custom validation filter from a predicate function.
Details
The predicate receives the decoded input value, the schema AST, and parse
options, and returns a FilterOutput. Non-success outputs are normalized into
schema issues. The annotations parameter annotates the filter itself; with
the default formatter, failures use message first, expected second, and
<filter> when neither is provided.
When abort is true, parsing stops after this filter fails instead of
collecting later check failures.
Example (Reporting failure at a nested path)
import { Schema } from "effect"
const schema = Schema.Struct({ password: Schema.String, confirmPassword: Schema.String }).check(
Schema.makeFilter((o) =>
o.password === o.confirmPassword
? undefined
: { path: ["password"], issue: "password and confirmPassword must match" }
)
)
console.log(String(Schema.decodeUnknownExit(schema)({ password: "123456", confirmPassword: "1234567" })))
// Failure(Cause([Fail(SchemaError: password and confirmPassword must match
// at ["password"])]))
Example (Reporting multiple failures at once)
import { Schema } from "effect"
const schema = Schema.Struct({ a: Schema.Finite, b: Schema.Finite, c: Schema.Finite }).check(
Schema.makeFilter((o) => {
const issues: Array<Schema.FilterIssue> = []
if (o.a > 0) {
if (o.b <= 0) issues.push({ path: ["b"], issue: "b must be greater than 0" })
if (o.c <= 0) issues.push({ path: ["c"], issue: "c must be greater than 0" })
}
return issues
})
)
console.log(String(Schema.decodeUnknownExit(schema)({ a: 1, b: 0, c: 0 })))
// Failure(Cause([Fail(SchemaError: b must be greater than 0
// at ["b"]
// c must be greater than 0
// at ["c"])]))
makeFilter(
(s: strings: string) => s: strings.String.toLowerCase(): stringConverts all the alphabetic characters in a string to lowercase.
toLowerCase() === s: strings,
{
Annotations.Augment.expected?: string | undefinedHuman-readable description of what a value is expected to satisfy.
Details
For filter and refinement failures, the default formatter uses
message first, then expected, and finally falls back to <filter>.
Use this to name a failed filter in the default message:
Expected <expected>, got <actual>.
expected: "a string with all characters in lowercase",
Annotations.Filter.meta?: Annotations.Meta | undefined(property) Annotations.Filter.meta?: {
_tag: 'isLowercased';
regExp: globalThis.RegExp;
}
Optional metadata used to identify or extend the filter with custom data.
meta: {
_tag: "isLowercased"_tag: "isLowercased",
regExp: globalThis.RegExpregExp: new module globalThisglobalThis.var RegExp: RegExpConstructor
new (pattern: globalThis.RegExp | string, flags?: string) => globalThis.RegExp (+2 overloads)
const LOWERCASED_PATTERN: "^[^A-Z]*$"LOWERCASED_PATTERN)
},
Annotations.Filter.arbitrary?: Annotations.ToArbitrary.Filter | undefined(property) Annotations.Filter.arbitrary?: {
constraint: { patterns: [string] };
}
Optional hints used by arbitrary derivation for this filter.
Details
The same annotation can be attached to a single filter or a
FilterGroup. Group hints apply to the same schema node while child
filters are still collected and checked normally.
arbitrary: {
Annotations.ToArbitrary.Filter.constraint?: Annotations.ToArbitrary.GenerationConstraint | undefined(property) Annotations.ToArbitrary.Filter.constraint?: {
patterns: [string];
}
Annotations.ToArbitrary.GenerationConstraint.patterns?: readonly [string, ...string[]] | undefined(property) Annotations.ToArbitrary.GenerationConstraint.patterns?: {
0: string;
length: 1;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
pop: () => string | undefined;
push: (...items: Array<string>) => number;
concat: { (...items: Array<ConcatArray<string>>): Array<string>; (...items: Array<string | ConcatArray<string>>): Array<string> };
join: (separator?: string) => string;
reverse: () => Array<string>;
shift: () => string | undefined;
slice: (start?: number, end?: number) => Array<string>;
sort: (compareFn?: ((a: string, b: string) => number) | undefined) => [string];
splice: { (start: number, deleteCount?: number): Array<string>; (start: number, deleteCount: number, ...items: Array<string>): Array<string> };
unshift: (...items: Array<string>) => number;
indexOf: (searchElement: string, fromIndex?: number) => number;
lastIndexOf: (searchElement: string, fromIndex?: number) => number;
every: { (predicate: (value: string, index: number, array: Array<string>) => value is S, thisArg?: any): this is S[]; (predicate: (value: string, index: number, array: Array<string>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: string, index: number, array: Array<string>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: string, index: number, array: Array<string>) => void, thisArg?: any) => void;
map: (callbackfn: (value: string, index: number, array: Array<string>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: string, index: number, array: Array<string>) => value is S, thisArg?: any): Array<S>; (predicate: (value: string, index: number, array: Array<string>) => unknown, thisArg?: any): Array<string> };
reduce: { (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: Array<string>) => string): string; (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: Array<string>) => string, …;
reduceRight: { (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: Array<string>) => string): string; (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: Array<string>) => string, …;
find: { (predicate: (value: string, index: number, obj: Array<string>) => value is S, thisArg?: any): S | undefined; (predicate: (value: string, index: number, obj: Array<string>) => unknown, thisArg?: any): string | undefined };
findIndex: (predicate: (value: string, index: number, obj: Array<string>) => unknown, thisArg?: any) => number;
fill: (value: string, start?: number, end?: number) => [string];
copyWithin: (target: number, start: number, end?: number) => [string];
entries: () => ArrayIterator<[number, string]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<string>;
includes: (searchElement: string, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: string, index: number, array: Array<string>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => string | undefined;
findLast: { (predicate: (value: string, index: number, array: Array<string>) => value is S, thisArg?: any): S | undefined; (predicate: (value: string, index: number, array: Array<string>) => unknown, thisArg?: any): string | undefined };
findLastIndex: (predicate: (value: string, index: number, array: Array<string>) => unknown, thisArg?: any) => number;
toReversed: () => Array<string>;
toSorted: (compareFn?: ((a: string, b: string) => number) | undefined) => Array<string>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<string>): Array<string>; (start: number, deleteCount?: number): Array<string> };
with: (index: number, value: string) => Array<string>;
}
const LOWERCASED_PATTERN: "^[^A-Z]*$"LOWERCASED_PATTERN]
}
},
...annotations: Annotations.Filter | undefinedannotations
}
)
}