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index.js
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index.js
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function validateParamType(paramName, paramValue, paramType) {
if (typeof paramValue !== paramType) {
throw new Error(`The parameter ${paramName} should be a ${paramType}.`);
}
}
class Injector {
constructor() {
this._registered = {};
}
resolve(dependencyName) {
validateParamType('dependencyName', dependencyName, 'string');
const handler = this._registered[dependencyName];
if (handler) {
return handler(this);
}
throw new Error(`The dependency ${dependencyName} is not registered.`);
}
register(dependencyName, handler) {
validateParamType('dependencyName', dependencyName, 'string');
validateParamType('handler', handler, 'function');
this._registered[dependencyName] = handler;
}
}
function createInjector() {
return new Injector();
}
module.exports = {
createInjector,
};