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Fix type narrowing for non empty array assert

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Eugene 2023-07-14 15:39:33 +01:00
parent 6d4f32287f
commit 16d8e52e2b
2 changed files with 32 additions and 2 deletions
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4
source/index.ts
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@ -575,7 +575,7 @@ type Assert = {
nodeStream: (value: unknown) => asserts value is NodeStream;
infinite: (value: unknown) => asserts value is number;
emptyArray: (value: unknown) => asserts value is never[];
nonEmptyArray: (value: unknown) => asserts value is [unknown, ...unknown[]];
nonEmptyArray: <T = unknown>(value: T | T[]) => asserts value is [T, ...T[]];
emptyString: (value: unknown) => asserts value is '';
emptyStringOrWhitespace: (value: unknown) => asserts value is string;
nonEmptyString: (value: unknown) => asserts value is string;
@ -681,7 +681,7 @@ export const assert: Assert = {
nodeStream: (value: unknown): asserts value is NodeStream => assertType(is.nodeStream(value), AssertionTypeDescription.nodeStream, value),
infinite: (value: unknown): asserts value is number => assertType(is.infinite(value), AssertionTypeDescription.infinite, value),
emptyArray: (value: unknown): asserts value is never[] => assertType(is.emptyArray(value), AssertionTypeDescription.emptyArray, value),
nonEmptyArray: (value: unknown): asserts value is [unknown, ...unknown[]] => assertType(is.nonEmptyArray(value), AssertionTypeDescription.nonEmptyArray, value),
nonEmptyArray: <T = unknown>(value: T | T[]): asserts value is [T, ...T[]] => assertType(is.nonEmptyArray(value), AssertionTypeDescription.nonEmptyArray, value),
emptyString: (value: unknown): asserts value is '' => assertType(is.emptyString(value), AssertionTypeDescription.emptyString, value),
emptyStringOrWhitespace: (value: unknown): asserts value is string => assertType(is.emptyStringOrWhitespace(value), AssertionTypeDescription.emptyStringOrWhitespace, value),
nonEmptyString: (value: unknown): asserts value is string => assertType(is.nonEmptyString(value), AssertionTypeDescription.nonEmptyString, value),

30
test/test.ts
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@ -1477,6 +1477,36 @@ test('is.nonEmptyArray', t => {
function_(value);
}
}
{
const strings = ['🦄', 'unicorn'];
const function_ = (value: string) => value;
assert.nonEmptyArray(strings);
const value = strings[0];
function_(value);
}
{
const mixed = ['🦄', 'unicorn', 1, 2];
const function_ = (value: string | number) => value;
assert.nonEmptyArray(mixed);
const value = mixed[0];
function_(value);
}
{
const arrays = [['🦄'], ['unicorn']];
const function_ = (value: string[]) => value;
assert.nonEmptyArray(arrays);
const value = arrays[0];
function_(value);
}
});
test('is.emptyString', t => {