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coerceBooleanProperty as property decorator
function coerceBooleanProperty(prop: unknown): boolean {
return !!prop;
const CoerceBoolean: PropertyDecorator = (proto, prop) => {
const values = new WeakMap();
Object.defineProperty(proto, prop, {
get() {
return values.get(this)
set(value: unknown) {
values.set(this, coerceBooleanProperty(value))
enumerable: true
class Example {
@CoerceBoolean prop = false;
get not() {
return !this.prop;
let ex = new Example;
console.log(ex, ex.prop);
(ex as any).prop = "lol";
console.log(ex, ex.prop);
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