@gik/tools-checker 0.0.11

A minimal type-checker for JavaScript purists. Part of our tools suite.

Contributors

• Héctor Menéndez

Supported platforms

Table of contents

• checker A minimal type-checker for JavaScript purists.
  • is Determine if given value really belongs to the corresponding type.
    • objectEmpty member Determine if an element is an object and has no keys
    • string member Determines if value is really a string.
    • number member Determines if value is really a number.
    • array member Determines if value is really an array.
    • function member Determines if value is really a function.
    • regexp member Determines if value is really a regexp.
    • boolean member Determines if value is really a boolean.
    • object member Determines if value is really an object.
  • props function Validates properties of given object.
• Types ``

checker

A minimal type-checker for JavaScript purists.

• Standalone version.
• Report a Bug.

Members

• is
• props

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is

Determine if given value really belongs to the corresponding type.

Members

• objectEmpty
• string
• number
• array
• function
• regexp
• boolean
• object

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objectEmpty

static property of checker.is

Determine if an element is an object and has no keys

Parameters

Returns

boolean - Whether the object is empty or not.

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string

static property of checker.is

Determines if value is really a string.

Parameters

Returns

boolean - Wheter value is string or not.

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number

static property of checker.is

Determines if value is really a number.

Parameters

Returns

boolean - Wheter value is number or not.

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array

static property of checker.is

Determines if value is really an array.

Parameters

Returns

boolean - Wheter value is array or not.

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function

static property of checker.is

Determines if value is really a function.

Parameters

Returns

boolean - Wheter value is function or not.

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regexp

static property of checker.is

Determines if value is really a regexp.

Parameters

Returns

boolean - Wheter value is regexp or not.

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boolean

static property of checker.is

Determines if value is really a boolean.

Parameters

Returns

boolean - Wheter value is boolean or not.

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object

static property of checker.is

Determines if value is really an object.

Parameters

Returns

boolean - Wheter value is object or not.

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props

static method of checker

Validates properties of given object.

Parameters

Returns

Object - The validated subject extended with default values (when applies).

Throws

• CheckerPropParamError when invalid parameters are passed.
• CheckerPropDefError when a type definition is invalid.
• CheckerPropDefTypeError when a type defintiion is not supported.
• CheckerPropReqError when a required property is not found.
• CheckerPropTypeError when a property does not match the defintion.

Example

const subject = { a: 1, b: 'hello' z: undefined };
const result = props(subject, {
    a: { type:'number', required:true },
    b: 'string',
    c: { default: new Date() },
    d: { required: false, default: null, map: value => [value, true] },
})
// result:
// { a: 1, b: 'hello', c: '1981-06-23 10:06:08', d: [null, true], z: undefined }

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Types

Members

• CheckerPropParamError
• CheckerPropDefError
• CheckerPropDefTypeError
• CheckerPropReqError

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CheckerPropParamError

static typedef of Types

A definition prop was sent, but it was invalid.

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CheckerPropDefError

static typedef of Types

The specified type is not a supported primitive.

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CheckerPropDefTypeError

static typedef of Types

A required property was not found in subject.

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CheckerPropReqError

static typedef of Types

A property didn't have the correct type.

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