vue-di-container/dist/container.js

Dependency injection container for Vue

export class Container {
    constructor(parent, resolver) {
        this.parent = parent;
        this.resolver = resolver;
        this.definitions = new Map();
        this.values = new Map();
        this.resolvingKeys = new Set();
    }
    register(provider) {
        const def = this.resolver.resolve(provider);
        if (def === undefined) {
            throw new Error('Malformed provider');
        }
        this.definitions.set(def.key, def);
    }
    get(key) {
        let value = this.values.get(key);
        if (value !== undefined) {
            return value;
        }
        const def = this.definitions.get(key);
        if (def !== undefined) {
            if (this.resolvingKeys.has(key)) {
                const keys = Array.from(this.resolvingKeys.values())
                    .map(k => k.name)
                    .join('\'\n\'');
                throw new Error(`Circular dependency while resolving:\n'${keys}'`);
            }
            this.resolvingKeys.add(key);
            try {
                value = def.get(this);
            }
            finally {
                this.resolvingKeys.delete(key);
            }
            this.values.set(key, value);
            return value;
        }
        if (this.parent) {
            return this.parent.get(key);
        }
        throw new Error(`Dependency '${key.name}' not found`);
    }
}