vue-di-container/dist/metadata.js

Dependency injection container for Vue

const PARAMETER_INJECTIONS = Symbol('parameter injections');
const PROPERTY_INJECTIONS = Symbol('property injections');
export class Metadata {
    constructor(reflection) {
        this.reflection = reflection;
    }
    getParameterKeys(fun, explicitKeys = []) {
        const reflectionTypes = this.reflection.getParameterTypes(fun);
        const parameterInjections = fun[PARAMETER_INJECTIONS] || [];
        const keys = [];
        const maxIndex = Math.max(reflectionTypes.length, parameterInjections.length, explicitKeys.length);
        for (let i = 0; i < maxIndex; i++) {
            keys[i] = explicitKeys[i] || parameterInjections[i] || reflectionTypes[i];
        }
        return keys;
    }
    setParameterKey(fun, index, key) {
        const parameterInjections = fun[PARAMETER_INJECTIONS] || (fun[PARAMETER_INJECTIONS] = []);
        parameterInjections[index] = key;
    }
    getPropertyKeys(cls, explicitKeys = {}) {
        const propertyInjections = cls[PROPERTY_INJECTIONS] || {};
        const keys = {};
        const merged = Object.assign({}, propertyInjections, explicitKeys);
        for (const name of Object.keys(merged)) {
            const key = merged[name] || this.reflection.getPropertyType(cls, name) || null;
            if (key === null) {
                throw new Error('Property injection key missing');
            }
            keys[name] = key;
        }
        return keys;
    }
    setPropertyKey(cls, name, key) {
        const propertyInjections = cls[PROPERTY_INJECTIONS] || (cls[PROPERTY_INJECTIONS] = {});
        propertyInjections[name] = key;
    }
}