src/util.ts


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export class MutableValue<T> {
    private inner: T;

    constructor(inner: T) {
        this.inner = inner;
    }

    get value() {
        return this.inner
    }

    public deriveNew(mutator: (self: T) => T): MutableValue<T> {
        this.inner = mutator(this.inner);
        return new MutableValue(this.inner);
    }
}