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Fix type guard for isWhitespaceString and isEmptyStringOrWhitespace (#207)

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Martin Eneqvist 2024-06-26 14:31:56 +02:00 • committed by GitHub
parent 8cbcaee674
commit 25a376875d
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3 changed files with 14 additions and 4 deletions
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9
source/index.ts
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@ -10,6 +10,7 @@ import type {
Primitive,
TypedArray,
WeakRef,
Whitespace,
} from './types.js';
const typedArrayTypeNames = [
@ -435,7 +436,7 @@ export function isEmptyString(value: unknown): value is '' {
return isString(value) && value.length === 0;
}
export function isEmptyStringOrWhitespace(value: unknown): value is string {
export function isEmptyStringOrWhitespace(value: unknown): value is '' | Whitespace {
return isEmptyString(value) || isWhitespaceString(value);
}
@ -777,7 +778,7 @@ export function isWeakSet(value: unknown): value is WeakSet<object> {
return getObjectType(value) === 'WeakSet';
}
export function isWhitespaceString(value: unknown): value is string {
export function isWhitespaceString(value: unknown): value is Whitespace {
return isString(value) && /^\s+$/.test(value);
}
@ -893,7 +894,7 @@ type Assert = {
emptyArray: (value: unknown, message?: string) => asserts value is never[];
nonEmptyArray: <T = unknown, Item = unknown>(value: T | Item[], message?: string) => asserts value is [Item, ...Item[]];
emptyString: (value: unknown, message?: string) => asserts value is '';
emptyStringOrWhitespace: (value: unknown, message?: string) => asserts value is string;
emptyStringOrWhitespace: (value: unknown, message?: string) => asserts value is '' | Whitespace;
nonEmptyString: (value: unknown, message?: string) => asserts value is string;
nonEmptyStringAndNotWhitespace: (value: unknown, message?: string) => asserts value is string;
emptyObject: <Key extends keyof any = string>(value: unknown, message?: string) => asserts value is Record<Key, never>;
@ -1277,7 +1278,7 @@ export function assertEmptyString(value: unknown, message?: string): asserts val
}
}
export function assertEmptyStringOrWhitespace(value: unknown, message?: string): asserts value is string {
export function assertEmptyStringOrWhitespace(value: unknown, message?: string): asserts value is '' | Whitespace {
if (!isEmptyStringOrWhitespace(value)) {
throw new TypeError(message ?? typeErrorMessage('empty string or whitespace', value));
}

2
source/types.ts
View file

@ -73,3 +73,5 @@ export type NodeStream = {
export type Predicate = (value: unknown) => boolean;
export type NonEmptyString = string & {0: string};
export type Whitespace = ' ';