assert

that

Signature

that(value, validator, errorMessage)

Description

Assert that a value passes validation

Parameters

Name	Type	Required	Description
value	*	yes	The value to validate
validator	function	yes	A function that returns true if the value is valid
errorMessage	string	yes	The error message to throw if validation fails

Returns

Type	Description
void

Examples

assert.that(5, (v) => v > 0, 'Value must be positive') // passes
assert.that(-1, (v) => v > 0, 'Value must be positive') // throws TypeError
assert.that('hello', (v) => typeof v === 'string', 'Must be a string') // passes

all

Signature

all(validations, validations[].value, validations[].validator, validations[].message)

Description

Assert multiple validations at once

Parameters

Name	Type	Required	Description
validations	Array.<{value: *, validator: function(), message: string}>	yes	Array of validation objects
validations[].value	*	yes	The value to validate
validations[].validator	function	yes	The validator function
validations[].message	string	yes	The error message if validation fails

Returns

Type	Description
void

Examples

assert.all([
  { value: 5, validator: (v) => v > 0, message: 'Must be positive' },
  { value: 'test', validator: (v) => v.length > 0, message: 'Must not be empty' }
]) // passes

assert.all([
  { value: 5, validator: (v) => v > 0, message: 'Must be positive' },
  { value: -1, validator: (v) => v > 0, message: 'Must be positive' }
]) // throws TypeError: 'Must be positive'

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