TypeScript Transformer Dates

Converts object properties from number or string to Date according to provided type having Date fields.
Aimed to convert parsed JSON objects to match given TypeScript interface.

Inspired by ts-transformer-keys.

Requirement

TypeScript >= 2.4.1

How to use

In TypeScript source

``ts
import { toDates } from 'ts-transformer-dates';

interface Range {
dateFrom: Date;
dateTo: Date;
notes: string;
}

const value = {
dateFrom: '2020-01-12T03:25:45.000Z', // date as ISO string
dateTo: 1578799545000, // date as number of milliseconds
notes: 'brown fox'
};

toDates(value);

console.log(value);
`

Outputs:

`js
{
dateFrom: 2020-01-12T03:25:45.000Z,
dateTo: 2020-02-12T03:25:45.000Z,
notes: 'brown fox'
}
`

webpack

`js
// webpack.config.js
const datesTransformer = require('ts-transformer-dates/lib/transformer').default;

module.exports = {
// ...
module: {
rules: [
{
test: /\.ts$/,
loader: 'ts-loader', // or 'awesome-typescript-loader'
options: {
// make sure not to set transpileOnly: true here, otherwise it will not work
getCustomTransformers: program => ({
before: [datesTransformer(program)]
})
}
}
]
}
};
``

License

MIT