Is there a way to access a variable as both a function and an object instance using TypeScript?
log("something");
log.info("something");
I've attempted various methods, such as modifying the prototype, but nothing has proven successful so far:
var log = (...args) => {
console.log(...args);
};
log.prototype.info = (...args) => console.info(...args);
Utilizing Object.assign makes this task achievable.
type Log = {
(...args: any): void;
info: (...args: any) => void;
};
const log: Log = Object.assign((...args: any) => console.log(...args), {
info: (...args: any) => console.log('INFO:', ...args),
});
log('hello');
log.info('world');
Here is the compiled version:
"use strict";
const log = Object.assign((...args) => console.log(...args), {
info: (...args) => console.log('INFO:', ...args),
});
log('hello');
log.info('world');If you prefer, there's no need to explicitly define the Log type. TypeScript will deduce the types of objects passed to Object.assign and create an intersection between them automatically.
const log = Object.assign((...args: any) => console.log(...args), {
info: (...args: any) => console.log('INFO:', ...args),
});
log('hello');
log.info('world');
You have the ability to add an .info property to the function object that was assigned to log in basic JavaScript.
log = (...args) => console.log(...args);
log.info = (...args) => console.info(...args);
log("something");
log.info("something");If you are working with TypeScript, make sure to qualify as needed, or use : any[]
const log = (...args: any[]) => console.log(...args);
log.info = (...args: any[]) => console.info(...args);
log("something");
log.info("something");
Credit to @HereticMonkey for sharing the TS Playground link. Please note: the console.info message will only display in the developer tools, not in the TS playground's in-page log.
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