Method set

packages/mobx/src/types/observablemap.ts:146–166

(key: K, value: V)

    }

    set(key: K, value: V) {
        const hasKey = this.has_(key)
        if (hasInterceptors(this)) {
            const change = interceptChange<IMapWillChange<K, V>>(this, {
                type: hasKey ? UPDATE : ADD,
                object: this,
                newValue: value,
                name: key
            })
            if (!change) {
                return this
            }
            value = change.newValue!
        }
        if (hasKey) {
            this.updateValue_(key, value)
        } else {
            this.addValue_(key, value)
        }
        return this
    }

    delete(key: K): boolean {
        checkIfStateModificationsAreAllowed(this.keysAtom_)