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typedescriptor
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typedescriptor identifies and describes types.
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$ npm install typedescriptor
First you need to import the functions you are interested in:
const {
isArray,
isBoolean,
isError,
isFunction,
isMap,
isNull,
isNumber,
isObject,
isReference,
isScalar,
isSet,
isString,
isSymbol,
isUndefined,
typeOf
} = require('typedescriptor');
If you use TypeScript, use the following code instead:
import {
isArray,
isBoolean,
isError,
isFunction,
isMap,
isNull,
isNumber,
isObject,
isReference,
isScalar,
isSet,
isString,
isSymbol,
isUndefined,
typeOf
} from 'typedescriptor';
Then, use the type-guards to determine a variable's type or to narrow a variable's type in TypeScript:
if (isNumber(value)) {
// Do something with the number.
}
The types array
, boolean
, error
, function
, map
, null
, number
, object
, set
, string
, symbol
and undefined
are supported.
The isError
implementation is re-exported from defekt
.
To get a variable's type as a string, use typeOf
:
const typeName = typeOf('foo');
//=> 'string'
This is not compatible with the builtin typeof
operator. Most notably: null
is not considered to be an object
, since TypeScript differentiates between the two. null
is considered a separate type.
The isObject
predicate overlaps with multiple others. If, for example, you want to treat a variable differently based on whether it is an array or any other object, you have to first check whether the variable is an array and only then check whether it is an object. If you would first check whether the variable is an object, the result would be true
even for arrays.
const doStuff = function (value: any): void {
if (isArray(value)) {
// Do things with the array and return!
}
if (isObject(value)) {
// Do things with the object, which now can not be an array.
}
}
The same is true for isError
, isMap
and isSet
.
To run quality assurance for this module use roboter:
$ npx roboter
FAQs
typedescriptor identifies and describes types.
We found that typedescriptor demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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