@dizmo/functions-before

Returns a function decorating an original function with a callback, which will be invoked before the execution of the original function. The callback can block the invocation of the original function by returning false.

Usage

$3

``sh
npm install @dizmo/functions-before --save
`

$3

`javascript
const { before } = require("@dizmo/functions-before");
`

$3

`typescript
import { before } from "@dizmo/functions-before";
`

`typescript
const f1 = (value: number): number => {
return value;
};
const f2 = before(f1, (
fn: Function, value: number
): boolean|undefined => {
const expect = value === 0 || value === 1;
});
const expect0 = f2(0) === 0;
const expect1 = f2(1) === 1;
`

`typescript
class Class {
@before.decorator((
fn: Function, value: number
): boolean|undefined => {
return false; // blocks method invocation!
})
public method(value: number): number {
return value;
}
}
const expect0 = new Class().method(0) === undefined;
const expect1 = new Class().method(1) === undefined;
`

Development

$3

`sh
npm run clean
`

$3

`sh
npm run build
`

#### without linting and cleaning:

`sh
npm run -- build --no-lint --no-clean
`

#### with UMD bundling (incl. minimization):

`sh
npm run -- build --prepack
`

#### with UMD bundling (excl. minimization):

`sh
npm run -- build --prepack --no-minify
`

$3

`sh
npm run lint
`

#### with auto-fixing:

`sh
npm run -- lint --fix
`

$3

`sh
npm run test
`

#### without linting, cleaning and (re-)building:

`sh
npm run -- test --no-lint --no-clean --no-build
`

$3

`sh
npm run cover
`

#### without linting, cleaning and (re-)building:

`sh
npm run -- cover --no-lint --no-clean --no-build
`

Documentation

`sh
npm run docs
`

Publish

`sh
npm publish
`

#### initially (if public):

`sh
npm publish --access=public
``

Copyright

© 2020 dizmo AG, Switzerland