@nestjs/common
Version:
Nest - modern, fast, powerful node.js web framework (@common)
35 lines (34 loc) • 1.33 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getInjectionProviders = getInjectionProviders;
/**
* check if x is OptionalFactoryDependency, based on prototype presence
* (to avoid classes with a static 'token' field)
* @param x
* @returns x is OptionalFactoryDependency
*/
function isOptionalFactoryDependency(x) {
return !!(x?.token && !x?.prototype);
}
const mapInjectToTokens = (t) => isOptionalFactoryDependency(t) ? t.token : t;
/**
*
* @param providers List of a module's providers
* @param tokens Injection tokens needed for a useFactory function (usually the module's options' token)
* @returns All the providers needed for the tokens' injection (searched recursively)
*/
function getInjectionProviders(providers, tokens) {
const result = [];
let search = tokens.map(mapInjectToTokens);
while (search.length > 0) {
const match = (providers ?? []).filter(p => !result.includes(p) && // this prevents circular loops and duplication
(search.includes(p) || search.includes(p?.provide)));
result.push(...match);
// get injection tokens of the matched providers, if any
search = match
.filter(p => p?.inject)
.flatMap(p => p.inject)
.map(mapInjectToTokens);
}
return result;
}